I need your help guys. Rag me later for not knowing, but for now, please just answer my question.
My 69 Vette has a cast exhaust manifold that some moron got too close to with a torch or grinder. I can't really tell. It's small enough to patch up, but can this be done on cast with a mig welder? If not, how about a stick welder? If not, WTF can I do to get this bitch on the way to Charlotte at the butt crack of dawn? (without the exhaust leak)
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CALLING ALL WELDING GURU'S PLEASE RESPOND ASAP
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It depends on the type of cast it is. And I am way off line here giving any kind of advice but if I recall correctly cast steel can be welded normally, where as cast iron needs a higher nickel content filler and pre/post heating applied with a torch.
As ghetto as it sounds, if the cut is small enough patch it up with JB weld.
As ghetto as it sounds, if the cut is small enough patch it up with JB weld.
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not if the welder knows anything about welding and proper techniquehklvette wrote:I don't know a lot about welding cast iron, but i wouldn't use stick to patch it up for fear of slag inclusions.
just my $.02
yep .... you got it right ....Leach wrote:It depends on the type of cast it is. And I am way off line here giving any kind of advice but if I recall correctly cast steel can be welded normally, where as cast iron needs a higher nickel content filler and pre/post heating applied with a torch.
As ghetto as it sounds, if the cut is small enough patch it up with JB weld.
I've only heard of welding cast iron with stick along with the stuff steve mentioned above. (doesn't mean its not possible with mig)
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I have attached turbo stands onto Mopar cast manifolds with high silicone bronze rod. Depending on the configuration I may have a set of manifolds but would have to see the old ones.
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Last edited by hssss on Fri Feb 11, 2011 9:54 pm, edited 1 time in total.
In my researching it was recommended to preheat the metal and either braze it or stick weld it with the proper rod. So I brazed a cast iron honda exhaust manifold to get it to pass inspection. It was a small 1" crack I cleaned it, ground a V to fill in, and preheated and brazed it up and it worked but only for 6 months. Next inspection time I just ground out what was left of the braze and used the mig to weld it up no preheating or anything. And it shows no signs of problems almost a year later. That dont mean its the best way but it worked for me.
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Billet Benny
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You're patching a hole/filling a crack.. Fire up the mig welder and spooge it shut.. Problem solved.. It's pretty irrelevant the method, since there's no need for strength but just bonding. You can repair that hole in that manifold with most any available welding method and almost any ferrous filler. Short of trying to use aluminum filler most anything will work. Including JB Weld or a drill and tap job to insert a plug.
Benny
'98 Taco
'05 Taco
'00 Cummins
'98 Taco
'05 Taco
'00 Cummins