>>I'm not a boiler maker, but I know for sure that you DON'T use a MIG on 
>>aluminium. The heat involved in welding steel is far greater and you can 
>>warp the head(I presume that's what your welding-if it is and you have a 
>>cracked port wall, don't bother.  I had that problem and everytime the 
>>machine shop fixed on hole, another would appear) I'm also pretty sure you 
>>use a TIG but get an experts opinion first.  It's also a lot trickier to 
>>weld than using a MIG.  I can't offer any tips as I'm not much of a welder 
>>myself.

Daniel Kroehn
>

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