broken exaust manifold

[Mega Arc 5040DD]

I have to weld a tab back on to my exhaust manifold. What rods should I use I have a DC machine. Also I don't have O/A to preheat it with would a propane torch work?

[george md]

Mega,
Being in the cast iron repair biz and especially manifolds , I would
put the arc weld on the shelf and weld it with O/A with cast iron rod and
proper flux. I see that you don't have an O/A set , now would be the
time to invest , that way you can weld it and expect it to be a permanent
repair.

I repair and reserect exhaust manifolds , I have some pictures
posted , you might like to see why I say to do it with O/A .
Here is a link to some repair . Take the tour , there are about 300
pictures of some odd repair .

http://imageevent.com/gmachine

george

[Mega Arc 5040DD]

Your probably right but another manifold would be cheaper :D its just a small tab that doesn't and doesn't need to be the strongest weld in the wold. A I have is the stick welder so that what i got to use:( so any ideas on what rod to use?

[Mr Meck]

First choice Ni 55, second choice 7018. Sweet George! I need more cast options. Thanks for the site. Went and visited your pics George. I need a heating place. I also wanted to ask you how to keep the backs gears from rattling on your LeBlonde Lathe as we have one just like it.

[Hammack_Welding]

You can use a Nickel 55 or a Nickel 99. A 309 Stainless rod will also work alot of times. I've never had much luck welding manifolds with any other rods.

[Brianstick]

What about Lincoln's Ferroweld? Did you ever try those rods?

[george md]

When welding cast iron , your first choice of weld should be O/A and
cast iron rod, second choice should be brazing , and a distant last
choice would be anything invoving an arc .

Mr Meck,
I have the Leblonde in and temp wired enough to make it run ,
but have not done any jobs on it yet. The little time it was running
it seems to me it did make quite a lot of noise , I'll try it again and
see how much noise. This lathe is 30 inch swing , I have an old
Flather 26 inch in the main shop ,also a 20" american tool works,
and a 14" lodge and shipley .
Send me an email with a phone # and I'll call you .

george

[MAC702]

I welded a crack in one using O/A for preheat, then ground out the crack. First pass with an old Eutectic rod I had lying around and second pass was E308. Buried it in hot sand after peening with a needle gun. I'm no expert, but it worked!

[Team_Torch]

Cold Roll 99 has been the best rod i've seen used for cast.A little pricey though .

[Rocky D]

Cronatron Certanium 889 get my vote...TIG or stick, never had a failure. It, too, is pricey.