Are the turbo manifolds and the wastegate swingvalves cast iron or cast steel? Just curious as if they are cast steel then welding is fairly straightforward.
Are the turbo manifolds and the wastegate swingvalves cast iron or cast steel? Just curious as if they are cast steel then welding is fairly straightforward.
cast iron
Originally Posted by 22mopar
Steve
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Judging by how they can be welded, I would say they are cast steel.
Mike Marra
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That is what I was wondering. It sounds like they weld up allright so I was leaning towards steel for the swingvalves. Not sure how to tell.
Aren't they a high nickel iron? Lots of em have been welded without issues. The problem, of course, is that as the steel of the weld shrinks it tears/separates some of the cast iron that is adjacent to the weld - creating a crack that you may not see. So, a series of stich welds with a nickel rod helps since the cracks are not continuous, instead they are like the stair step zig zag of the joints in a brick wall.
Best method I have heard of is - immediately after each stich, while it is still yellow and orange have an assistant use many many blows with a pick hammer to expand the metal adjacent to the bead and also to expand the bead itself - all to mechanically expand the metal while it is shrinking/cooling - sort of a race to expand it as it shrinks. Those multiple pick blows will minimize shrinkage cracking/separation of the parent casting from the weld. Pre-heating of the casting is assumed as that too reduces the amount of shrinkage.
John Laing
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called peening...
as well as post heating, and nice, slow, controlled cooling.
Clay
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Do the spark test. Hit it lightly with a grinder if throws lots of sparks it's steel, if not many it's cast iron.
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