MANUFACTURE OF FLUX-CORED WIRE FOR WELDING

摘要

PROBLEM TO BE SOLVED: To provide a flux-cored wire free from disconnection during the drawing at high speed and excellent in productivity by contracting the element wire in which the flux containing the iron powder of the prescribed amount with prescribed grain size and fluidity is filled in a steel outer shell. SOLUTION: In a manufacturing method of a flux-cored wire for welding, an element wire in which the flux containing 30-85% iron powder whose grain size is <=125μm and whose fluidity is <=23 seconds/50g is filled in a steel outer shell, is contracted. The flux-cored wire for welding free from disconnection during the drawing at high speed, excellent in the productivity and excellent in the welding workability is manufactured.