Tig question: wg flange/valve seat bead cracking and I'm unsure why
I'm finishing up a mild steel sched 40 manifold and for some reason the flange/valve seat for the generic 40mm wastegate will not cleanly attach to the schedule 40 pipe. I can lay a bead and it cracks almost instantly. The flange appears to be cast steel. I'm certain many of you guys have welded them so what's up? Am I going to have to heat the hell out of it before and allow it to slowly cool? I've welded cast before but this one is a PITA!
Is that just what comes with purchasing a cheap ass wastegate? Is it stainless steel by chance and if so would it make a difference? I'm using er70s2 filler. Here's a pic of the same style wastegate: http://trendgears.com/ebay/MiragePow.../WG-40-003.jpg |
Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
If you are welding 304 to steel you should use 309l rod or better I would think.
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Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
The manifold is sched 40 mild steel.
Is the wastegate body and flange stainless steel? If so then you may have a point. If not then I'm simply welding mild steel to mild steel although the flange may be cast. I just tested it with a magnet and it sticks so I assume it's mild steel. In that case why is it cracking? |
Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
Show me the weld.
Assuming you know what you're doing.
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Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
scrap the cast flange and buy a regular mild steel one.
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Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
Thanks guys I'll pre/post heat and give that a shot. I did skip weld but eventually they start to crack. The welds are cracking right in the middle. There are sections that remain uncracked but they eventually crack as other areas fuse and hold.
I can't peen the weld because it begins to crack before I can even lay down the torch and grab a hammer.
Originally Posted by weiRtech
scrap the cast flange and buy a regular mild steel one.
http://www.speed-boys.com/EBAY/WG/WG40_1.jpg |
Re: Tig question: wg flange/valve seat bead cracking and I'm unsure why
you might be able to use a normal flange and a fire ring if you can get one for that thing
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