Many moons ago I purchased a spot welding attachment for a standard arc welder. It was put away and never used, or even tested. Given I'm currently engaged in some car renovation, I thought I'd break it out and put it through its paces. I was actually quite surprised to find it after all this time.
This is the device. It has a steel collar that makes contact with the workpiece, and a carbon electrode that is controlled by a trigger. The lead on the device is connected to the welding rod holder and the workpiece is earthed as normal.
You place the steel collar on top of the workpiece, bring the carbon electrode into contact with the 2 pieces of metal to be joined and then, using the trigger, slowly retract it till an arc is created. You leave it in that position for a couple of seconds.
The method of fusing the two pieces of metal is to melt a hole into the top piece, with the melted metal then fusing with the 2nd piece of metal around the hole. Many welders do this when spot welding by drilling a hole in the top piece of metal and welding around the edge of the hole.
I used a couple of pieces of scrap to test it and it worked quite well. Certainly useful for spot welding new panels on a car.
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