[wethvento]

i have a stock exhaust manifold off of 1.8 8v motor that i have no use for........
im guessing that its made out of cast iron..........
QUESTION: is it possible to weld a piece of mild steel to that manifold???
if so what kind of weld would be best for this job????
thanks
any other suggestions are welcome

 

[wethvento]

ok.....anybody w/ some welding experience??????

 

[91 Aigner]

Re: question about welding a turbo flange to stock manifold.. (wethvento)

Yes it's possible, use SMAW, GTAW or GMAW with a high nickel rod. Mcmaster sells some for doing cast iron welding. Pre-heat and post heat, then slow cool.

 

[BlackFoxer]

Re: question about welding a turbo flange to stock manifold.. (91 Aigner)

I wouldn't use GMAW because of lack of penetration compared to other process.
Possible but it's prone to crack easily especially if you add a turbocharger.
Why not simply do it the best way a first? If you can't afford it right now then wait. Don't forget: Cheap, Fast, Reliable.. you can only choose two.

 

[betajetta]

Re: question about welding a turbo flange to stock manifold.. (BlackFoxer)

you can weld cast iron with a MIG welder.....but DOOOO NOT use an arc welder. weld really slow and dont get the casting hot or it will crack.

 

[sdezego]

Re: question about welding a turbo flange to stock manifold.. (betajetta)

Quote, originally posted by betajetta »

you can weld cast iron with a MIG welder.....but DOOOO NOT use an arc welder. weld really slow and dont get the casting hot or it will crack.

Why not? I have with great success.
Here is a pic of my 8v Turbo manifold that I built back in '90 and logged over 60,000mi as a DD w/o any cracks or issues.
You may note the supporting bracket on the front of the Flange? That is a major key to longevity on any manifold for a transverse engine car.
Use High Nickel rods as mentioned if you are going to use stick (which is what i would suggest). Just MHO
oh, yea, and I am far from an expert welder.
Shawn

 

[Passenger Performance]

Use stick or tig, with high nickel rod as stated, I have also used a certain type of iconel rod as well with good success. I wouldn't use mig.