Guys, I am attempting to "join" a plate steel pipe bung, to the top hat of a late ford ('05 Focus) FI fuel pump that delivers to the A rod's engine. The pump "hat" appears to be soft formable steel. Except that I've not been able to: silver solder, braze, OR oxy/acet weld the joint. Any wizards know what Ford uses in their late model steels? Or how to weld/join? The weld has no strength, and just cracked... {Turns out that the plate was stainless!}
Sure you're not working against something that started as metallic powder before sintering? More and more of it around every day.
Sounds like the metal used on some exhaust pipes. I have no clue what it is, but when you cut with a torch, it blows away in chunks. I just assumed it was some sort of low grade stainless that maybe was used for the higher temps of a catalytic converter??
Even if it is a low grade of stainless you should be able to weld it with a 7018 low hydrogen rod I think. I have ran across the exhaust like that before and thats what I did. I'd use a 3/32 rod and try it.
Ian, the weld appears to have some alloying element, that causes the weld puddle to display small yellow-heat flecks, which act like high heat impurities. Later the weld will crack, simply as it cools, or if stressed at all. She's stainless, and does grind/file/prep exactly like CRS.
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