Welding help & advice
I've become a fan of TIG silicon bronze brazing as opposed to MIG for most applications. Less heat, more control very little distortion. TIG may cost a little more than MIG but you can do more with it.
The latest Horror Fright TIG unit is a very affordable unit with foot control.
But the foot control is awkward for working on a car. It is more for bench work.
I'm doing it anyway. But I wish I had thumb control.
I put copper backup and repair pin hole rust if I can with TIG.
My only concern for him is that MIG is not only a little cheaper, but less "tedious" than TIG
I would suggest starting with MIG despite the "advantages" of TIG.
(I read on the internet and have asked a mechanical engineer that MIG does in fact change the structure of metal to weaken it as opposed to TIG. Remember you can read anything on the internet. So I really don't know if it does).
If he is replacing a cowl, there is a thread on here showing the use of Lord Fusor weld through crash durable adhesive to glue the top to the bottom sections.
Then it does not have to be welded.
I contacted the manufacture to confirm that we hobbyist do not have the necessary spot welding equipment to do it right anyway.
I've used that rather than weld a cowl. It's just as good, if not better than welding.
And it does not leave areas exposed to moisture for rust.
MIG Brazing