Today I was trying to TIG up small mild steel bracket that I had supported from behind with one of those magnetic squares and I was trying to get a bead on the other side of the bracket. For the life of me I could not get the arc to sit anywhere near the joint. After a few tries I was thinking what metal have I used that is making the arc behave so erratically. I thought bugger this and got the MIG onto it and although it too struggled at first to lay down a bead where I wanted it, got a very big bead down and although it was ugly as sin, the job was done. Reflecting some time later, I figured it must have been the magnetic field from the square that was playing havoc?


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