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I am going to repair an old tractor manifold.actually I already welded on a broken off ear for one of the exhaust ports, but it went very poorly. poor access, and a lot of re-grind and re-weld. it's two parts bolted together and the WILL NOT come apart. so I'm asking to avoid problems with the next part.I am using ERCuSi-A filler.when I tried my tig I was having all sorts of awful result. I think mostly due to poor access, so I switched to oxy fuel and I did OK. Still had **** adherence on the first few tries. Ok finally, seems to be well stuck together anyway.There is a substantially long crack down the back of one of the runners but access to about 1/2 of it is also bad. but I think I can do it with the oxy fuel. no way the tig.my question is 2 parts really.#1 is tig with the ERCuSi-A even a legitimate thing to do with cast iron exh manifold?I seem to remember researching and buying it for this sort of project, but it has been so looooong, and I'm a hack and I forgot.#2 and if I use the torch again, what sort of flux. I have Solar, but the last time the solar really did not work to well, I also have Harris Stay-Silv 700*1800FPreheat necessary? post weld cool down precaution?it's a big bastard and I don't have a vermiculite enough to cover it. but I could get some?I thought the braze was soft enough (or not contracting ehough) to require PWHT.Thanks,
Reply:Originally Posted by dsergisonI am going to repair an old tractor manifold.actually I already welded on a broken off ear for one of the exhaust ports, but it went very poorly. poor access, and a lot of re-grind and re-weld. it's two parts bolted together and the WILL NOT come apart. so I'm asking to avoid problems with the next part.I am using ERCuSi-A filler.when I tried my tig I was having all sorts of awful result. I think mostly due to poor access, so I switched to oxy fuel and I did OK. Still had **** adherence on the first few tries. Ok finally, seems to be well stuck together anyway.There is a substantially long crack down the back of one of the runners but access to about 1/2 of it is also bad. but I think I can do it with the oxy fuel. no way the tig.my question is 2 parts really.#1 is tig with the ERCuSi-A even a legitimate thing to do with cast iron exh manifold?I seem to remember researching and buying it for this sort of project, but it has been so looooong, and I'm a hack and I forgot.#2 and if I use the torch again, what sort of flux. I have Solar, but the last time the solar really did not work to well, I also have Harris Stay-Silv 700*1800FPreheat necessary? post weld cool down precaution?it's a big bastard and I don't have a vermiculite enough to cover it. but I could get some?I thought the braze was soft enough (or not contracting ehough) to require PWHT.Thanks,
Reply:I got antsy and tried the stay silv.petersn's #2 for cast iron.... I googled but all I could find out is it is a "black flux" high temp flux, but I cant find much info.and the harris sta-silv is a "black high temp flux" also.... and..... I have a can! -and I just tried it. it worked beautifully. it wetted out real nice with the torch. and I wrapped tinfoil all around in several layers to cool slowly.thanks so much. it worked so much better.
Reply:I had a exhaust manifold crack on an old tractor. New used was not available. I bolted the manifold to a piece of 1/2" X 8" flat. I preheated the manifold and the flat with a rosebud tip then used some OA cast iron rod (it comes in 24-30 inch length and measures about 3/16" square) with the flux that was recommended for the application then filled in the V of the crack and broken off ears. The cast iron of the manifold is heated to a dark cherry red and the cast rod is melted into the orginal. I covered the entire piece to keep the heat contained for a slower cool. The first manifold I ever tried worked like a champion after welding the first time. The second one off a ford pkup taught me much humility on welding.
Reply:lots and lots of humility to be had when welding cast |
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发表于 2021-8-31 23:58:52