Posted by Fred Martin on January 26, 2011 at 07:53:20 from (216.158.74.158):
In Reply to: Re: Hole in block?? posted by challenger on January 26, 2011 at 06:02:10:
The two metals expand and contract at different rates. Cast iron has good compression strength, but not much tensile strength. (pulling apart strength) When they're welded (molten and then cool, the nickel rod (fillermetal) will contract and actually pull away from the parent metal so, if you take a 16 ounce ball peen hammer, using the ball end and ding the new hot weld for one or two minutes after welding a maximum of about one inch (less if you hear a "tink" or crack, you will relieve those stresses set up by the welding then...wait till you can lay your hand continuously on the weld...run another weld 3/4 to 1" long and peen again till weld is done. If it is a crack that you're welding, you should drill a 1/8" hole all the way through at the very end of the crack to determine the thickness of the parent metal so you will know just how thick to vee the crack before welding about 3/4 of the way through) The hole will stop you from chasing the crack further and you can fill in the 1/8" hole with the welding rod. Clean real well after each weld, very important. Cleanlines is next to Godliness here. If you have pinholes in the weld, grind them out and do the weld over again. ohfred
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