Welding cast to mild steel

[tomfc]

Well im fitting a turbo onto one of my project cars, they turbo has got an elbow fitted which is made from cast, the exhaust would usually be clamped onto this, however as the turbo is from a different car and i dont have a downpipe to cut up and they are prone to blowing, so i was wondering is i could make up my own downpipe and weld it straight to the cast elbow?

If it is possible what would be the best way to go about doing it?

 

[the snooper]

i think i would get a section of pipe to connect the 2 given the fact its a turbo and will get extremely hot will the 2 materials expand at the same rate? if not the cast piece may crack

 

[tomfc]

Yea i never thought of that, i guess ill just get on the hunt for a matching downpipe to cut up.

Thanks for the advice.