I am a novice weldor restoring my 1953 MG YB. I'm finding that whenever I attempt to weld new metal to the old I am blowing holes in the old metal. I am scrupulously cutting out rust and grinding the surface clean. Both the old and new metal is 1.2mm thick, I start welding on the new and flow through to the old material, on reaching the old metal more often than not a hole appears accompanied by a flurry of sparks from the welder tip. If I try bridging the holes with weld they only grow larger. This is really frustrating me, my welder is a very old Migatronic Autoweld 140 but I have recently had it checked over by a very experienced weldor who recknos that it is A1 so the problem must be my rubbish welding, the old metal or a combination of the two!
Any ideas or tips to avoid the blow holes will be much appreciated.
This is my 1953 MG YB
New metal in wheel housing prior to welding; held in place with magnets. (Yellow colour on right hand side is something to do with lighting, it's not really this colour).
Blow holes in old metal, new metal is ok.
Rear side of weld
Any ideas or tips to avoid the blow holes will be much appreciated.
This is my 1953 MG YB
New metal in wheel housing prior to welding; held in place with magnets. (Yellow colour on right hand side is something to do with lighting, it's not really this colour).
Blow holes in old metal, new metal is ok.
Rear side of weld