Double-sided friction stir welding method, manufacturing method of cold rolled steel strip and plated steel strip, double-sided friction stir welding apparatus, and manufacturing apparatus of cold rolled steel strip and plated steel strip

摘要

Both sides friction stir welding method, manufacturing method of cold rolled steel strip and plated steel strip, double-sided friction stir welding apparatus, and manufacturing equipment of cold rolled steel strip and plated steel strip are provided.The present inventionA pair of rotary tools arranged on one side and the other side of the butt or overlay of the steel stripWhile rotating in opposite directions, they are pressed against the butt or overlaps of the steel strip and moved to the joining direction.While rotating the unjoined part of steel strip by friction heat with rotating tool and unjoined part of steel bandA double-sided friction stir welding method in which the softened portion is agitated by the rotary tool to produce plastic flow to bond the steel stripsA pair of rotary toolsHaving a circular and flat shaped tipTipIt is harder than steel strip.