I've found in general that beating objects with hammers does reduce stress,
so this sounds like a valid solution!
At 01:20 PM 11/5/99 -0600, William Eastman wrote:
>I don't know if anyone still cares about this. Being on the digest
>offers very few opportunities to answer technical questions since there
>are many knowledgeable people with faster response time. That and I
>have to be at my computer when I remember the question.
>
>We used to weld a lot of cast iron at our machine shop. Use a normal
>arc welder and nickel rod. The key is to beat the weld with a hammer
>during the cooling process to reduce residual stresses. Otherwise you
>will get another crack near the original.
>
>I have used this on exhaust manifolds and it worked but whether it
>would work on an MG manifold with your equipment and technique I have no
>idea. If my latest attempts at torch welding are any indication I would
>have nothing left but a twisted and cracked pile of metal. I guess that
>all of the other education has just pushed the useful stuff out. If
>the manifold is already cracked you probably have little to lose.
>
>Regards,
>Bill Eastman
>61 MGA
>
>
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