Blowhole.multidot.pit preventing agent and arc-welding method using the same
AssigneeKawasaki Steel Corporation
InventorsKoichi Yasuda, Shosaburo Nakano, Noboru Nishiyama, Takaro Matsumoto, Katsuaki Nakatsuji, Tadao Komatsu, Tadashi Nakajima
Life of this patent
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Abstract
In lap joint welding of galvanized sheets, the occurence of blowhole and pit is prevented by applying a blowhole.multidot.pit preventing agent comprising a phosphorus compound as an effective ingredient prior to the arc-welding.
Claims5
A blowhole-pit preventing agent for arc-welding of (1) used as a coating on galvanized sheets subjected to arc welding consisting of 5-70% by weight of at least one ferrophosphorus selected from the group consisting of Fe.sub.2 P, FeP, Fe.sub.3 P and FeP.sub.2 and having a phosphorus content of 15-55% by weight, 0.1-20% by weight of an additive and the balance being a solvent.
A method for lap joint arc-welding a galvanized sheet, which comprises applying a blowhole-pit preventing agent consisting of 5-70% by weight of at least one ferrophosphorus selected from the group consisting of Fe(2)P, FeP, Fe(3)P and FeP(2) and having a phosphorus content of 15-55% by weight, 0.1-20% by weight of an additive and the balance being a solvent to at least one of the lapped surfaces to be welded and then performing an arc-welding.
Dependencies are inferred from the claim text.