This kind of work is something that I pay a pro to do.
If the tubes are not welded to the housing correctly they will crack.
if the tubes are not straightened you will have problems
if the ends are not on straight bearings will wear out.
just find a good chassis shop to do it for you.
I have used DTS they did a good job on mine
Team Z Motorsports, is one of the ones I know will do a good job,
If you have a problem you have someone to go back to most shops will stand behind the work they do.
no flame intended but
If you are asking questions about what welder to use you are not qualified to do this type of work.
trust me this is something you want done right the first time.
I think the labor to put my ends one weld and straigten the housing was about $250
418 FTI LS3 Mast intake FTI hyd roller Holley EFI 275 MT Pump gas 93 oct.
9.53 140.73 1.33 60' 6.05 113.58
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