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MMA on thin metals

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ChrisH	27/05/2009 10:32:45
1023 forum posts 30 photos	Following on from the welding in the workshop article in MEW, I have a MMA set but now need to weld some thin material which one would usually use I suppose MIG. However, I would rather not splash out on a MIG set at the moment if I can afford it. There is an item known as a 'Body Welding Attachment' for a MMA set which is advertised as being able to weld using MMA down to 22g(?), using a pulsating action with 1.6mm rods. Anyone have any experience using such an attachment? Is it worth buying? Out of interest, my MMA set, which I have had for many years, used to suffer from overheating when using large rods for extended periods, giving rises to enforced cooling off periods of about an hour. I fitted a fan out of an old computer to give a forced air flow over the set and since then, no more overheating! Chris Edited By ChrisH on 27/05/2009 10:33:41
AndyP	28/05/2009 11:53:02
189 forum posts 30 photos	I believe I had such an attachment many year ago and never got on with it well, but then my arc welding isn't up to much either! I had far more joy from what I believe was called a "carbon arc" device - 2 copper covered carbon rods in a holder with one wire from the set to each rod. It generates a sort of electric flame and you weld rather like a gas set with ordinary filler wire. Then I got seduced by the joys of oxy-acetylene and never looked back. Cheers, Andy
Clive1958	30/05/2009 13:45:11
10 forum posts	I agree with the above regarding the carbon arc attachment having used one very successfully, it may also be worth trying your existing set-up but with a piece of copper held in place to the rear, this acts as a heatsink and makes it near impossible to blow a hole through as long as the plate is thick enough, ive used the method several times with success. Clive

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