Types of Welding Joints

Different jobs require different types of welding joints, as in different applications it will need to stand up to different needs and forces. Depending on the joint, the welder needs to choose a suitable welding process. There are basically five types of welding joints to bring the two metal parts together.

Different Types of Welding Joints

types of welding joints

Tee Joint

A tee joint is formed when two parts are interested at a 90-degree angle with one edge lying at the center of the other. They are placed in the form of letter T. This type of weld joint requires the use of the fillet weld that is applied on both sides of the metal.

The tee joint can also be used when a pipe is welded onto a base metal.

There are seven welding styles that can be used to create a tee joint:

  • Slot weld
  • Plug weld
  • Fillet weld
  • Bevel-groove weld
  • Flare-bevel-groove weld
  • J-groove weld
  • Melt-through weld

Butt Joint

Butt welds are created when two pieces of metal are joined when they are placed side by side in the same plane. It’s often used for welding pipes, valves, fittings and other.

This type of joint is usually used for materials up to 3/16” thick. It’s also not advisable to use on metals that will be in the future subject to high impact loads.

When welding thicker plates or if you need full penetration, the plates can be beveled. These types of butt welds are called groove welds. If there is beveling, it will require more filler metal, which will ensure the higher strength of the joint.

The most common style for creating a butt joint a square groove weld. It’s used when two parts are placed together side by side in parallel.

All the styles for butt joints include the following:

  • Square-groove weld
  • Bevel-groove weld
  • V-groove weld
  • U-groove weld
  • J-groove weld
  • Flare-V-groove weld
  • Flare-bevel-groove weld

Corner Joint

Corner joints are some of the most common types in the sheet metal industry, such as in the construction of boxes, frames and other such applications. It’s formed when two parts come together at the center of a right angle. The two parts form a letter L.

The following are the styles for creating corner joints:

  • V-groove
  • U-groove
  • J-groove
  • Fillet
  • Spot
  • Edge
  • Corner-flange
  • Square-groove or butt
  • Bevel-groove
  • Flare-V-groove

Lap Joint

This type of joint is usually used when welding pieces that have different thickness. It’s formed when two parts are placed over each other in an overlapping way. The joint can be welded on either just one side or both sides for more strength. This joint is widely used in electron beam, laser beam and resistance spot welding.

There are following welding styles:

  • Spot
  • Plug
  • Slot
  • Bevel-groove
  • J-groove
  • Flare-bevel groove

Edge Joint

The edge joint is used to join together two or more parts that are adjacent parallel placed. The parts can also be approximately parallel or they can have flanging edges. The process welds the same edges of two parts.

However, keep in mind that it’s not a very strong joint as the weld doesn’t fully penetrate the thickness of the joint. So it’s mostly used for joining edges of sheet metal or mufflers, or in other low stress and pressure applications. To reinforce the plate, the welder can add filler metal.

The following styles are applicable for creating these type of joints:

  • J-groove
  • V-groove
  • U-groove
  • Bevel-groove
  • Corner-flange
  • Square-groove
  • Edge-flange

As you probably know, it’s essential to have proper safety gear for welding. We have articles reviewing different safety gear, such as welding helmets, welding boots, and other. We also review different welding equipment, such as MIG, TIG, and Plasma welders.

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