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welding cast alloy (cylinder head)

by gan boon san
(johore, malaysia)

hi,
i use TIG to weld the cylinder head, but i got a problem.when i start to weld the casting there are many bubble come out from the casting and the bubble will come out after i mill the cylinder head.got any solution to solve the problem? thank!

best regards.

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Thats very common with any oil soaked or carbon impregnated casting.

often, it requires welding a little bit, then burring the weld back out with a carbide burr, then welding again, etc...until the metal cleans up.

its good to do a skim cut with a carbide burr every pass also so you dont get finished and have a bunch of holes as a surprise.

4047 filler can help too

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