question for you weldors/fabricators
question for you weldors/fabricators when you guys are building your intercooler piping/boost piping, headers or cages/roll bars are you guys using filler rod or are you using the autegenous* (spelling) method.
Originally Posted by RealQuick
Taken from the "expert weldor" over at turbo mustangs. Funny cause I have found it impossible to weld aluminium with DC, much like the rest of the world. The only reason you would ever not use filler rod for tubing is when you have overlapping seams, and its not structural. Neither apply for what you are asking. You can use mild steel filler for moly, but it can crack. 308L stainless works better.
You can use mild steel on chromo but it aint recommended. in fact using chromo is not recommended but it you have to get some chromo filler or use 308 stainless. you have to use AC welding aluminum. just try it on DC.. 
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I use ER70S2 with the 4130N chromemoly, or mild steel.
you can use DC on aluminum.... but just to tack weld. it provides a smaller arc than ac, therefore allowing a "zap" tack. good for sheetmetal setup. gotta use a short wave, and set the amperage pretty stiff.
when welding intercooler tubing, or headers, i'd surely use filler rod, as the seam will be VERY prone to a crack when under pressure, but moreso when subjected to vibration. best process is to just hit the seam where both parts are touching, and tack it in a couple places. then remove the assembly and fully weld it. most materials will undercut at the edge of the weld with no filler, enough to provide a stress area for a crack to start.
you can use DC on aluminum.... but just to tack weld. it provides a smaller arc than ac, therefore allowing a "zap" tack. good for sheetmetal setup. gotta use a short wave, and set the amperage pretty stiff.
when welding intercooler tubing, or headers, i'd surely use filler rod, as the seam will be VERY prone to a crack when under pressure, but moreso when subjected to vibration. best process is to just hit the seam where both parts are touching, and tack it in a couple places. then remove the assembly and fully weld it. most materials will undercut at the edge of the weld with no filler, enough to provide a stress area for a crack to start.
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I always use filler rod on steal unless I'm building a non-structural component and I want a very flat weld like for IC plumping. Even then I've got rod in my left hand to add material where needed. It saves some grinding and clean up when setting up for chrome or powder coat.
Originally Posted by ty_ty13
one more question... when welding chrome moly do you use the same filler rod as you do when welding mild steel?
Your actually supposed to stess relieve Chromoly after you weld it also. Also beware of hexavalent chromium. OSHA is big on this right now, I just had a meeting last week.
Its in stainless, and obviously chromoly.
http://www.osha.gov/SLTC/hexavalentc...cognition.html
Its in stainless, and obviously chromoly.
http://www.osha.gov/SLTC/hexavalentc...cognition.html
My advice is go hang out with an experienced weldor for a couple days even if you have to pay them or take a class or two at a community college and learn the right way to do it first, lot of bad and good info about welding on the net..
This will get you started:
http://www.millerwelds.com/education/TIGhandbook/
http://www.lincolnelectric.com/knowl...rint=yIt's
http://www.tigdepot.com/products/p29.html
This will get you started:
http://www.millerwelds.com/education/TIGhandbook/
http://www.lincolnelectric.com/knowl...rint=yIt's
http://www.tigdepot.com/products/p29.html
Originally Posted by kp
My advice is go hang out with an experienced weldor for a couple days even if you have to pay them or take a class or two at a community college and learn the right way to do it first, lot of bad and good info about welding on the net..
This will get you started:
http://www.millerwelds.com/education/TIGhandbook/
http://www.lincolnelectric.com/knowl...rint=yIt's
http://www.tigdepot.com/products/p29.html
This will get you started:
http://www.millerwelds.com/education/TIGhandbook/
http://www.lincolnelectric.com/knowl...rint=yIt's
http://www.tigdepot.com/products/p29.html
im in trade school right now actually
