Was talking to guy today about mig welding and reckons there's a spray that you spray on the metal near the weld area,this helps to protect the shroud from the metal and stop the wire fromwelding to the copper tip.

Was he talking a load of cobblers?
Anti-spatter spray
I can also vouch for box section warping, I made my machine from 60mm 2mm wall and it still warped a little even though I was ultra careful not to put too much heat into it.

Andy



Andy