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If the welder was smart he'd realize that aluminm melts at a way lower temp than steel, there for, all he has to do is put some little tacks on the place where the rivets go, it won't stick to the steel. Also have him "peen" the weld as it's cooling to reduce the chances of cracking later.
I have a VC that i took the baffle out of and now am in the process of welding it back in, but i've been too lazy to finish it. But i can assure you that using the correct amperage and properly pre-heating the part will yield a nice finished result.
One problem i'm having is that i'm re-doing the whole thing ( i ground all the rivets off) and the heat from the welding is warping the steel as i go along, and that's what i got lazy about battling and why i haven't finished it. With your 2-3 rivets it shouldn't be a problem though.
There was a thread on here a while back where a guy lost a bunch of those rivets down in his engine and it fu(kered things up in his motor, that's another reason i've almost thought about not putting the baffles back in, and also part of why i took the factory rivets off in the first place ( The main reason was to clean where you couldn't get to on the backside of the baffle)
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