No Heat, No Distortion: The 100% Clean Join You Need

A clean joint should do more than hold two parts together. It should protect the shape, finish, and function of the material.

That is where heat-free or low-heat joining becomes useful. Traditional welding can create strong connections, yet the heat may cause discoloration, surface marks, shrinkage, or warping. Thin metal sheets can lose their shape. Plastic parts may soften. Finished components may need extra grinding or repainting before they are ready for use.

I often see the same problem in small fabrication jobs: the joint is secure, but the surrounding area no longer looks clean.

A low-heat joining method helps reduce that risk.

The process depends on the material and the joining system. Some applications use structural adhesive. Others use mechanical joining, ultrasonic welding, conductive epoxy, or a cold-welding repair compound. Each method has its own working range, so the material, load, temperature, and surface condition need to be checked before work begins.

A clean join usually starts with surface preparation.

Remove oil, dust, loose paint, and oxidation from both surfaces. A clean cloth and a suitable degreaser can help with basic preparation. Metal surfaces may need light abrasion to improve contact. Plastic parts require more care because some solvents can damage or soften them.

I do not treat surface cleaning as a small step. Poor preparation can leave gaps inside the joint, even when the outside looks smooth.

The next step is alignment.

Place the parts together without applying the joining material. Check the position, edge line, gap, and overall shape. For thin panels, use a simple jig or clamp to prevent movement during curing or bonding. The support should hold the parts in place without leaving pressure marks.

This is especially useful for sheet metal, plastic covers, trim pieces, and small enclosures. A few minutes spent checking alignment can prevent visible correction work later.

Apply the joining material in a controlled amount.

Too little material may leave weak spots. Too much can create overflow, extra cleanup, and an uneven edge. A narrow, continuous bead is often easier to control than several large drops. Follow the product instructions for mixing, open time, curing time, and temperature.

For conductive epoxy used in electronics repair, the surfaces must stay clean and dry. The compound should not spread onto nearby contacts or moving parts. For plastic assembly, ultrasonic welding can create a neat bond without using a separate adhesive, yet the correct plastic type and joint design are required.

Keep the parts stable while the joint sets.

Movement during curing can produce a visible line or a weak connection. Clamps, fixture blocks, or low-tack tape can help. The holding method should match the surface finish. A polished panel may need a protective layer between the clamp and the part.

Do not test the joint too early. A surface may feel firm while the inside is still curing. The waiting period depends on the product and the environment. Temperature, humidity, joint thickness, and material type all affect the result.

A practical example can be found in electronics repair. When a small connector or component needs support, a technician may use low-temperature conductive epoxy instead of applying direct heat near a sensitive board. This can reduce the chance of heat damage, though the material still needs to meet the electrical and mechanical requirements of the repair.

Another common example is plastic housing assembly. Ultrasonic welding uses vibration to join compatible thermoplastic parts. There is no separate glue line to clean, and the process can produce a consistent seam when the joint design is correct. It is not suitable for every plastic or every shape, so a sample test remains useful.

For metal repair, cold-welding compounds can fill small gaps, rebuild worn areas, or join selected surfaces without a torch. These materials are often used for maintenance work rather than high-load structural parts. The repaired area needs enough curing time, and the finished strength should match the actual use.

A clean appearance does not prove that a joint is strong.

I check the connection based on its purpose:

• Is the joint carrying weight?
• Will it face vibration or impact?
• Will it contact water, oil, or cleaning chemicals?
• Will the temperature change during use?
• Does the material expand at a different rate?
• Can the joint be inspected after assembly?

These questions matter more than a smooth surface alone. A neat seam on a decorative cover has different requirements from a connection used in a machine frame.

Heat-free joining also has limits. It may not replace welding for high-load steel structures, pressure systems, safety parts, or applications with strict certification requirements. Some adhesives lose strength at high temperatures. Some cold-welding compounds are difficult to remove. Mechanical joining may leave holes or fastener marks. The right method depends on the job, not only on the appearance of the finished seam.

My preferred approach is simple: choose the joining method after checking the material, load, environment, and finish. Prepare the surfaces carefully. Align the parts before applying anything. Use only the amount needed. Keep the assembly still during curing or setting. Inspect the joint before putting it into service.

When the application allows it, a no-heat or low-heat process can help preserve the original shape and finish. The result is not just a cleaner line. It is a connection planned around the material, the working conditions, and the actual purpose of the part.

When I work with welded parts, I often see the same problem: the joint looks sound at the start, yet the finished piece bends, twists, or no longer matches the drawing. Distortion can affect fit, surface quality, assembly time, and product performance.

A strong, distortion-free joint does not come from adding more heat. It comes from controlling the whole welding process, from material preparation to cooling.

I start with clean, well-prepared materials. Oil, rust, paint, moisture, and mill scale can create pores, weak areas, and unstable arcs. I remove contamination from both sides of the joint and check that the edges match the required joint design.

The fit-up also needs attention. Uneven gaps force the welder to add more filler metal and heat in certain areas. A consistent root gap gives the weld a more stable shape. I use clamps, temporary tabs, or a simple fixture to hold the parts in position before welding begins.

The fixture should hold the work firmly without blocking natural movement. Metal expands as it heats and contracts as it cools. If the workpiece has no room to move, stress can build inside the joint and cause bending after release.

I use tack welds to keep alignment, but tack welds should be placed with a plan. Small, evenly spaced tacks usually provide better control than a few large tacks. Each tack should be checked for cracks, poor fusion, or excessive height before the main weld starts.

Heat control makes a direct difference to distortion. A high current setting, slow travel speed, or wide weave can place too much heat in one area. I select the lowest practical heat input that still produces proper fusion and penetration.

Travel speed matters as well. Moving too slowly allows heat to spread through a wider section. Moving too quickly may leave an undersized weld or incomplete fusion. I watch the weld pool, keep the arc length steady, and maintain a consistent travel angle.

The welding sequence can reduce pulling and twisting. For long joints, I avoid welding from one end to the other in a single continuous pass when the design allows another method. Skip welding, back-step welding, and welding from the center toward the ends can help distribute heat more evenly.

For large frames, I often use a balanced sequence. I weld one side, move to a matching area on the opposite side, and allow short cooling periods between passes. This approach does not remove all movement, but it can reduce the difference in contraction between both sides.

A practical example comes from a rectangular steel frame used for equipment support. The first batch was welded around the frame in one direction. After cooling, several frames showed a slight twist, and the mounting holes needed extra adjustment during assembly.

The next batch used cleaner fit-up, smaller tack welds, alternating weld locations, and shorter weld sections. The team also checked the frame on a flat table between passes. The frames showed less movement, and the mounting work became easier. The change did not depend on a stronger machine. It came from better control of preparation, sequence, and heat.

Welding position also affects the result. Flat-position welding may give the operator better control over the weld pool. When the joint must be welded in another position, the settings and technique should match that position. A setting that works well on a flat plate may create excess heat or poor control on a vertical joint.

Interpass temperature deserves a place in the work instructions. If the part becomes too hot, later passes may add more distortion or affect the material. A temperature check between passes can give the welder a simple way to keep the process within the planned range.

Cooling should happen in a controlled way. Water cooling may create unwanted stress or material changes, depending on the metal and welding procedure. In many cases, allowing the part to cool naturally on the fixture is a safer choice. The correct method depends on the material, thickness, joint design, and approved procedure.

Inspection should not wait until the complete assembly is finished. I check dimensions after fit-up, after tack welding, during multi-pass welding, and after cooling. Simple tools such as a straightedge, square, caliper, height gauge, or fixture reference can reveal movement early.

Visual inspection can identify undercut, overlap, cracks, pores, uneven bead shape, and poor tie-in. When the joint carries a high load or must meet a specific standard, additional testing may be needed. Dye penetrant, magnetic particle, ultrasonic, or radiographic testing should be selected by a qualified person based on the material and joint requirements.

My view is simple: distortion control begins before the arc is struck. A clean surface, stable fit-up, suitable tack welds, balanced sequence, controlled heat, and timely measurement work together. No single setting can replace that process.

When a joint needs strength and accurate shape, I do not chase speed by adding more heat. I build a process that gives the metal a controlled path to expand, contract, and settle. That is the smarter way to create strong joints with less distortion and fewer corrections after welding.

When I need to join two materials cleanly, heat is not always the best answer. Heat can leave burn marks, soften coatings, warp thin panels, or damage parts that contain plastic, foam, wiring, or finished surfaces. Mechanical fasteners may hold well, yet they can leave holes and visible marks.

A cold joining method can solve these problems when the materials and working conditions are suitable. It uses an adhesive, bonding film, tape, or another low-heat joining system to connect surfaces without welding or high-temperature tools.

The result depends less on the product name and more on the preparation.

Where cold joining can help

I often see this method used for:

• Furniture edge repairs
• Plastic parts and housings
• Metal labels and panels
• Signage and display pieces
• Laminates and decorative sheets
• Foam, rubber, and coated materials
• Small repairs where drilling is not practical

A common furniture repair shows the benefit clearly. A laminate edge may lift from a cabinet panel. Applying heat can affect the finish, while small screws would leave visible marks. After cleaning the surfaces, applying a suitable bonding material, and holding the edge in place, the repair can remain neat with little surface change.

The right choice depends on the material, joint size, load, moisture level, and expected movement.

Step 1: Check the materials

Different surfaces need different joining methods.

Smooth plastics may resist some adhesives. Powder-coated metal may need light abrasion. Porous wood can absorb liquid bonding products. Rubber may move after bonding, so a rigid adhesive may crack when the part flexes.

I check these points before starting:

• Are the surfaces porous or smooth?
• Is either material flexible?
• Will the joint face pulling, sliding, or peeling force?
• Will the part contact water, oil, sunlight, or heat?
• Does the surface contain paint, powder coating, or a protective film?

A small test area helps reduce risk. I apply the selected material to a hidden section and observe the bond after the stated curing period.

Step 2: Prepare the joint

Surface preparation often controls the quality of the join.

I remove dust, oil, loose coating, and old adhesive. A clean, lint-free cloth works for light dirt. The cleaning agent must match the material, since some solvents can cloud plastic or soften painted surfaces.

For smooth metal or plastic, gentle abrasion can create a better surface for some products. I use light pressure and remove the remaining particles before bonding. The goal is to improve contact, not to remove a large amount of material.

The joint should also be dry. Moisture trapped between the surfaces can affect curing and may lead to lifting at the edges.

Step 3: Apply the right amount

More adhesive does not always create a stronger join. Excess material can squeeze out, extend the curing time, and create a visible edge.

I apply a thin, even layer across the contact area. For a narrow repair, a small bead may be enough. For a wide panel, spreading the material can help avoid dry spots and air pockets.

The product instructions matter here. Some materials need an open time before the parts meet. Others require immediate contact. The working time can also change with temperature and humidity.

Step 4: Align before pressing

Once the surfaces touch, movement may be limited. I position the parts carefully before applying pressure.

For a straight edge, a guide or masking tape can help keep the joint aligned. For larger panels, I use clamps, weights, or a flat support surface. The pressure should be even. Too much force can push out most of the bonding material or deform thin parts.

A clean cloth or protective sheet can prevent marks from clamps and weights.

Step 5: Allow the joint to cure

A bond may feel firm before it reaches its stated strength. I avoid pulling, bending, or loading the joint during the curing period listed by the manufacturer.

Temperature affects this stage. A cold workshop may slow the process, while high humidity may affect certain products. I keep the joined parts still and protected from dust until the curing window has passed.

This step is easy to rush, especially during repair work. Waiting is often less costly than removing a weak bond and repeating the job.

How to keep the finish clean

Visible residue is one of the most common problems with cold joining.

I wipe away excess material only when the product instructions allow it. Some adhesives should be removed while wet. Others are easier to trim after partial curing. Using the wrong solvent may damage the surface, so I test it on an unseen area.

Masking tape can create a neat boundary on painted panels, laminates, and finished wood. I remove the tape at the recommended stage, before the material becomes too hard to cut.

For a clean edge, I prefer several small checks during application rather than trying to correct a large amount of overflow later.

Common mistakes

A weak or messy joint often comes from one of these causes:

• Bonding over oil, dust, or old loose material
• Skipping the compatibility test
• Applying too much product
• Moving the parts during curing
• Loading the joint before it has cured
• Using a rigid product on a flexible material
• Ignoring moisture or outdoor exposure
• Applying solvent to a surface that it can damage

A cold joining method is not suitable for every job. Structural repairs, pressure-bearing parts, safety-related components, and high-temperature applications may need a qualified assessment or a different joining process.

A practical repair example

Imagine a plastic cover that has separated from a painted metal frame. Welding could leave heat marks, and drilling could create holes in both parts. A suitable adhesive may be a better option when the cover is not carrying a heavy load.

I would clean both surfaces, test the adhesive on a hidden area, apply a controlled amount, align the cover with temporary tape, and leave it undisturbed for the full curing period. After curing, I would inspect the edge for gaps, lifting, and surface damage before returning the part to service.

This approach does not rely on heat, and it keeps the original surfaces largely unchanged.

Clean joining comes from matching the method to the materials, preparing the surfaces, controlling the amount, and giving the bond enough time to cure. When I treat those steps as part of the repair rather than minor details, the finished joint looks neater and the risk of material damage becomes easier to manage.

Warped edges can turn a clean installation into a repair job. Panels may lift, joints may open, and visible lines can appear across the surface. I know how frustrating this feels, especially after spending time preparing the area and fitting each piece.

A smooth joint starts before the adhesive is applied. The surface, material, moisture level, and fitting method all affect the result.

I use a simple process to reduce the risk of warping.

1. Check the surface

The base should be dry, clean, and reasonably flat. Dust, grease, loose paint, or moisture can weaken the bond and place stress on the joint.

I check the wall or floor with a straightedge. Small uneven areas can often be corrected before installation. Larger dips or raised spots need attention before the material goes down.

2. Let the material adjust

Panels and boards can react to changes in temperature and humidity. I place the material in the installation area and allow it to adjust to the room conditions before cutting.

This step is easy to skip when a project is moving quickly. It can also affect the way the pieces join later.

3. Dry-fit every piece

I place the pieces without adhesive and check the full layout. This helps me find tight corners, uneven walls, outlets, doors, and other areas that may need a cut.

Dry-fitting also shows whether the joints close neatly. If a seam already looks forced before bonding, adhesive will not solve the issue.

4. Use the right amount of adhesive

Too little adhesive can leave unsupported areas. Too much can push material out of position and create a raised seam.

I follow the product instructions and spread the adhesive in an even pattern. The correct method may change with the material, the surface, and the room conditions.

5. Join from one side

I align one edge and work across the panel instead of pressing the whole piece down at once. This helps reduce trapped air and keeps the joint under control.

When two edges meet, I apply steady pressure along the seam. A clean cloth can remove excess adhesive before it dries.

6. Support the joint during curing

The material should stay in position while the adhesive sets. Depending on the product, this may involve painter’s tape, temporary supports, weights, or a seam roller.

I avoid moving the panels too soon. A joint can look secure on the surface while the bond underneath is still setting.

A common example is a wall panel installation behind a kitchen worktop. The wall may look flat, but small changes around corners and sockets can place pressure on the panel. Dry-fitting the pieces, leaving the required movement space, and supporting the seam during curing can help keep the surface even.

Clean joining is not only about appearance. It also helps reduce open seams, raised edges, and unnecessary repair work. I focus on preparation, careful alignment, balanced adhesive coverage, and enough curing time.

The material still needs to match the room and the installation conditions. No joining method can remove every risk caused by moisture, movement, poor preparation, or an unsuitable surface. A careful process gives the joint a better chance to stay neat and stable.

A strong joint does more than hold two parts together. It must fit the design, handle the working load, resist the surrounding conditions, and stay consistent from one production run to the next.

I often see teams focus on the joining tool while overlooking the preparation before the tool is used. A clean weld can still fail when the surfaces are misaligned. A well-applied adhesive can still peel when the materials were not prepared correctly. A tight fastener can still loosen when the joint carries vibration.

Better results come from a controlled process.

Start with the joint, not the equipment

I begin by asking a simple question: what will this joint experience after assembly?

The answer may include:

• Pulling or pushing forces
• Repeated vibration
• Heat or temperature changes
• Moisture and chemical exposure
• Movement between the joined parts
• Pressure from nearby components
• Appearance requirements

A joint inside a machine frame may need strength and repeatability. A visible metal panel may need a clean surface with little distortion. A plastic housing may need a joining method that protects the material from heat.

The joining method should match the job.

Common options include:

• Welding for many metal-to-metal applications
• Brazing for controlled heat and reliable bonding
• Adhesive bonding for mixed materials and smooth surfaces
• Riveting for thin sheets and serviceable assemblies
• Bolting when parts may need removal
• Mechanical interlocking for selected plastic and sheet-metal designs

A process that works well on stainless steel may not suit aluminum, coated steel, or engineering plastic. Material choice shapes the entire workflow.

Prepare both surfaces with care

Surface preparation often decides whether a joint performs well.

Oil, dust, rust, paint, moisture, and oxide layers can reduce contact between materials. Some contaminants may not be visible, so a quick visual check is not always enough.

My preparation routine usually includes:

1. Remove oil and grease with a suitable cleaner.
2. Take away loose rust, paint, or oxide layers.
3. Check the surface for cracks, dents, and deep scratches.
4. Dry the parts before joining.
5. Protect the prepared surface from fresh dust and handling marks.

The cleaning method should suit the material. A product that is safe for steel may damage plastic. A rough abrasive may help an adhesive grip, yet it may leave particles that affect the joint.

The goal is not to make every surface look the same. The goal is to create a clean, stable contact area that fits the selected joining method.

Control the fit before applying heat, pressure, or adhesive

A poor fit creates trouble for every joining process.

Large gaps can weaken adhesive bonds and increase the amount of filler needed. Excessive gaps can also create uneven weld penetration. Parts that touch at only a few points may move during assembly, causing stress in the finished joint.

I check:

• Gap size
• Edge alignment
• Flatness
• Hole position
• Contact area
• Clamping points
• Access for the joining tool

A simple dry fit can reveal problems before they become expensive. I place the parts together without joining them and check whether the assembly sits naturally. If force is needed to hold the parts in position, the design or fixture may need attention.

A good fixture does more than save time. It keeps the parts stable while the joint forms.

Choose a lower-heat process when distortion is a concern

Heat can change the shape, hardness, color, or surface condition of a material. Thin sheet metal is especially sensitive. A long weld bead may pull the material out of alignment as it cools.

A lower-heat or no-heat method may help with:

• Thin panels
• Decorative metal surfaces
• Heat-sensitive plastics
• Pre-painted parts
• Assemblies with tight dimensional limits
• Components that contain seals or electronic parts

Cold joining methods can include mechanical fastening, structural adhesives, clinching, riveting, and selected cold-welding processes. Each method has its own limits.

For example, adhesive bonding may reduce visible marks and spread the load over a wider area. Riveting may offer a simple and inspectable connection. Mechanical clinching can join certain sheet materials without adding a separate fastener.

The right choice depends on the load, material, service conditions, and repair needs.

Use the correct joining sequence

The sequence affects both quality and repeatability.

I set the parts in position, apply the fixture, and inspect the alignment before making the joint. If the assembly uses multiple joining points, I work in a pattern that reduces movement. On a long metal panel, placing joints from the center toward the ends may help control distortion. The exact pattern depends on the part shape and material.

Adhesive bonding needs its own timing. The parts must be assembled within the product’s working time, and the pressure must remain steady while the bond develops. Moving the parts too early can create weak areas that are hard to see.

Fastened joints need controlled tightening. Too little pressure may allow movement. Too much pressure can damage thin material, strip threads, or squeeze out a sealing layer.

A written work instruction helps operators follow the same sequence across different shifts.

Check the joint before it leaves the work area

Inspection does not need to be complicated to be useful.

I look for:

• Gaps or visible separation
• Uneven contact
• Cracks, pinholes, and sharp edges
• Burn marks or heat damage
• Adhesive squeeze-out in unwanted areas
• Loose or damaged fasteners
• Part movement after joining
• Incorrect alignment

For a production line, a sample test can add more information. A test piece made from the same material and process settings can be checked through pull testing, torque testing, peel testing, or visual comparison.

The test method should reflect the way the joint will be used. A peel test may suit a bonded panel. A torque check may suit a threaded connection. A load test may suit a bracket that supports equipment.

Records also help. When a joint shows a problem, I can compare the material batch, surface preparation, operator settings, fixture condition, and inspection results. Without those records, teams often guess.

A practical workshop example

A small fabrication shop was assembling thin aluminum covers for control cabinets. The covers looked clean after welding, yet several pieces warped enough to create uneven gaps during final assembly.

The team changed the process in several ways:

• They improved the holding fixture.
• They reduced the length of each weld pass.
• They alternated the joining points instead of working along one side.
• They allowed the panel to cool between passes.
• They checked flatness before removing the part from the fixture.

The result was better dimensional consistency, with less rework on the cabinet assembly. The change did not come from one setting alone. It came from controlling fit, heat, sequence, and inspection as one process.

That lesson applies to many joining methods. A reliable joint is usually the result of several small controls working together.

Build a process people can repeat

Good joining work should not depend only on an experienced operator’s memory.

A clear work instruction can include:

• Approved materials
• Surface cleaning method
• Joint dimensions
• Fixture position
• Tool settings
• Joining sequence
• Curing or cooling time
• Inspection points
• Acceptable and unacceptable examples
• Action to take when a defect appears

Training should include both correct samples and common mistakes. Operators learn more easily when they can compare a stable joint with one affected by contamination, poor fit, excess heat, or uneven pressure.

I also review the process when the material, supplier, design, or production volume changes. A small change in coating thickness or part tolerance can affect the joint.

Better joining starts before the tool is turned on

A clean, stable joint comes from a clear match between material, design, preparation, equipment, and inspection.

When I review a joining process, I look beyond the final appearance. I ask whether the joint can handle its working conditions, whether operators can repeat the method, and whether defects can be found before the product reaches the next stage.

That approach reduces avoidable rework and helps each assembly perform as intended. The goal is not to force every project into one joining method. The goal is to choose a practical process, control the details, and verify the result.

When I need a strong joint with a clean shape, heat is not always the best tool.

Welding can create a reliable connection, but heat may also cause warping, discoloration, changes in material properties, or extra finishing work. These issues become more difficult when the parts are thin, small, or made from materials that react quickly to temperature changes.

A controlled cold-joining process offers another option. It uses pressure, mechanical forming, or high-frequency vibration to connect parts with little heat input. The joint can stay close to its original dimensions, which helps when fit and alignment matter.

I usually look at four points before choosing the process:

• Material type and thickness
• Required joint strength
• Tolerance and alignment needs
• Surface and appearance requirements

For thin aluminum panels, a traditional heat-based process may leave visible marks or cause slight bending. A cold-forming or mechanical joining method can reduce these concerns when the joint design is suitable. The parts still need proper support, clean contact surfaces, and controlled force.

A typical workflow looks like this:

1. Prepare the parts

The contact areas should be clean and free from oil, loose coating, and debris. Uneven surfaces can reduce contact and affect the final joint.

1. Set the joint design

The overlap, hole size, edge distance, and forming point all affect performance. A joint that looks simple may need careful sizing to prevent cracks or weak spots.

1. Control the joining force

Too little force may create an incomplete connection. Too much force can mark the surface or damage thin material. Pressure should match the material and tool setup.

1. Check alignment

Clamps, guides, or fixtures help keep the parts in position. This step matters when the finished assembly must match a drawing or fit with another component.

1. Inspect the result

Visual checks can identify surface damage, uneven forming, or gaps. Depending on the application, pull testing, torque testing, cross-section checks, or dimensional inspection may also be useful.

A small metal fabrication shop may use this approach when producing aluminum brackets for equipment housings. The brackets need to remain flat so they can fit into a frame. A joining method with low heat input can reduce post-process straightening and help the shop maintain consistent dimensions from part to part.

The process does not remove the need for engineering checks. Some applications still require welding, brazing, bolts, rivets, or another joining method. The right choice depends on load, vibration, corrosion exposure, production volume, and access to the joint.

My view is simple: joint strength and dimensional control should be planned together. A joint that holds well but changes the shape of the part can create problems during assembly. A clean-looking joint that has not been tested may create risk later.

With the right material review, fixture setup, force control, and inspection plan, low-heat joining can help produce strong, accurate connections while reducing heat-related distortion.

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1. American Welding Society, 2015, Welding Handbook Volume 1: Welding Science and Technology
2. John C. Lippold, 2014, Welding Metallurgy and Weldability
3. Robert W. Messler Jr., 2004, Joining of Materials and Structures
4. Edward M. Petrie, 2007, Handbook of Adhesives and Sealants
5. Joseph E. Shigley, Charles R. Mischke and Richard G. Budynas, 2015, Mechanical Engineering Design
6. International Organization for Standardization, 2020, Welding and Allied Processes: Recommendations for Joint Preparation and Quality Control