Re: welding castiron

Posted by Earl Borchardt on April 24, 2000 at 05:28:26 from (202.155.38.49):

In Reply to: welding castiron posted by ole frank on April 22, 2000 at 18:58:31:

Ole Frank, Al, Vanda2, & Wildman,
I'm really injoying this! And I mean this in a respectful manner. I knew this computer was good for something.
Al has touched on what is most likely the most important part of welding cast iron. Pre heat and cooling down is of the utmost importance. But don't forget groove preparation. Get rid of the oil and dye! The welding procedure that Venda2 describes takes this into account with the use of the torch in front of the stinger however this in my opinion is not a proper preheat. Having said that Venda2 if you have had success with it don't quit a winner. The repair procedure that Al talks about is an approved method. It use to be called simply stitching. There is ( was )a similar method called metal lock and was done by a company of the same name in Chicago.
Engine blocks are generally cast of "Gray Iron" but some were not. Gray iron is but one of several types of "cast Irons". Each of these "cast irons" has its own properties and may differ in a welding repair procedure.
If this engine block that Ole Frank is talking about is small enough and is indeed of gray iron then I think that the entire block should be preheated to at least 500 degrees + F. The welding is then done by an experienced cast iron welder and allowed to cool slowley over a 24 hour period.
Lets ask our selves an important question. Is a welding repair really required? If the crack that Ole Frank is talking about is in the water jacket or oil jacket for example why not investigate the use of epoxy. I have used this stuff for some unbelievable repairs and have had good results.
Ole Frank if you are talking about a common 350 Chevy then throw it over the bank and go buy a new one. Respects and best regards, Earl in Indonesion

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