Ben, you have to point your mig head at something. Normally it would be at the joint where to two pieces of metal meet. David's right, point the torch head more toward the thicker piece and let the thinner get heat simply because it's in the immediate neighborhood of the red hot thicker part. I just had great success welding EMT tubing to 1/8 inch and 1/4 inch thick brackets and it worked to perfection.
If you point the torch head at the thin stuff, any current that is hot enough for the thick stuff is way too hot for the thin stuff and you will burn thru the thin.
If you don't know what you're doing, as I don't, sometimes it helps to push the envelope a little just to see what's going to happen when you do. I was mig welding with too short a wire. When I lengthend the wire (pulled back on the torch head a little) the welds got hotter and my welds straightend out fine. They look like peanut butter now (smooth not crunchy!) and hold up fine. Good luck........
Hey aametalmaster, that washer is a great tip to remember. Thanks for taking the time.
[This message has been edited by Your Old Dog (edited 12-24-2005).]
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