When pieces are joined at 90 degrees and take the shape of an L, they form a corner joint. These joints are easy to assemble and require little if any edge preparation. You'll often use them for projects or applications that require a square frame, such as fabricating a weld table.
The two types of corner joints are open corner and closed corner. When the edge of one piece lies flush against the edge of another, it’s a closed corner joint. An open corner joint is when two edges meet at their corners and there’s an opening where you can see the thickness of each metal.
Choosing between an open and closed corner joint often comes down to the material thickness and the strength required for the application.
With open corner joints, you may need to increase your travel speeds when you’re welding on thinner materials to prevent burn-through. Open corner joints create a V shape and may require more weld deposit, depending on the material thickness.
If you’re welding a closed corner joint, you can grind the weld face to create a smooth transition from the weld to the base material.
It is important that you properly fit your workpieces when creating a corner joint. If your project requires a 90-degree angle make sure it’s square and consider possible distortion during welding. Depending on how you prepare the joint, the angle can change after welding and lead to distortion. One way to prevent distortion is by creating a jig or fixture that holds the parts in place.
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