Moparts Tech Archive
Welding cracked exhaust manifold?Faust
From: N. Attleboro, MA, USA
Registered: Dec 1999
posted 06-29-2002 08:06 AM
I have heard various reports on welding cracks in exhaust manifolds. Has anyone had any luck? Is this a job for gas or stick? Any better methods?
Needs to be preheated, Using a Tig Torch with NiChrome wire...Flame spray works too, but is somewhat involved..
cd is right faust,,a stick welder will not get the iron hot enough for the weld to be affective,i have repaired cracks and have welded alot of broken studs with getting the iron cherry red,all around the area and using a good flux brass welding rod and letting it puddle up and keep working the area around the weld keeping it cherry red ,so as to get a permanent weld.you can then grind the area back into shape and paint it or whatever,
i have welded many a manifold using stick welder and nickle rods....
it's not hard to fix. go get a few nlw 5565 rods, stop drill the crack and clean the surface really well. you can cold weld if it's not a real wide crack. no more than 1/2 inch at a time, remove slag, let it cool for a few minutes and repaet until your finished.
i cranked the heat all the way up and the feed almost all the way up on my 110 mig and the weld lasted 100k miles on my 56 dodge manifold
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