My 78 spitfire with catalytic converter suffers from cracks in the exhaust
manifold. I had it professionally welded up a couple of years ago, but it
broke into two pieces within about a month. Just recently I had to put it
back on for emissions reasons, so I did a quick weld up using my own amateur
skills and wire feed welder; it got me through the inspection, but is now
leaking again. I took it off and tried welding it more carefully, but had
trouble. There was a lot of spatter and the beads resisted "sticking" to
the metal. And I couldnt get a continuous weld, the welds insisting on
"beading up" kind of like water on a freshly waxed car. I tried several
different settings on the welder with no luck.
My questions are:
Why did the welds behave like that?
And does anyone have any opinions about heat temperature epoxies in this
application? My local auto parts store carries one; I thought that if I
smeared it all over the manifold, it would not only reinforce my welds, but
seal the small leaks between beads.
TIA!
Greg Rowe
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