To provide a method for producing a zinc-base alloy-plated, electric resistance-welded steel tube having excellent quality in the welded part without developing defective welding by reducing plating embrittlement crack easily developing when a electric resistance welding is applied, in the method for producing the zinc-base alloy plated, electric resistance-welded steel tube used for steel tubes and square tubes mainly used for buildings and cars.
In the method for producing zinc-base alloy-plated electric resistance-welded steel tubes, when a zinc-base alloy-plated steel sheet is formed into a tubular-state and this butting parts are electric resistance-welded, the position of the rotating shaft of a squeezing roll is used as a reference, and to the welding part surface in the range from a position of 100 mm apart on the upstream side to a position of 50 mm apart on the downstream side and containing a welding HAZ part, compressed air or inert gas is blown at ≥100 m/sec gas flow velocity.
KODAMA SHINJI
KOBAYASHI JUNICHI
MIZUHASHI NOBUO
NISHIMURA KAZUMI
Jun Tsuruta
Hiroshi Kamematsu
Masaya Nishiyama
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