This Yanmar diesel cast iron engine threw a push rod through the top, leaving a large hole in the cast iron block. For this repair, http://MuggyWeld.com 77 arc electrode, 2% lanthanated tungsten with 17 lbs argon was used.
The welders at PDX TIG Welding in Portland, Oregon employed a mild steel plate to weld to the cast iron engine block.
After removing the coating from the 77 rod by dropping them in a bucket for a few minutes, tack welds were used to secure the steel plate in place before adding 1/2 inch welds throughout the weld area– making sure to cool for a minute or two between passes.
Peening is always helpful, as well as heating the block so it doesn’t cool too quickly. When TIG welding, it is advised to bring the cast iron to a bright red, then add the rod just before the cast puddles.
Please read all instructions prior to use at: https://www.muggyweld.com/wp-content/uploads/2017/04/77-instructions.pdf
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