| 摘要 |
PROBLEM TO BE SOLVED: To exhibit good feedability even under a severe usage condition in which feed resistance is increased due to bending of a liner, etc., by specifying the surface roughness of a welding wire and forming a feed lubricant on the surface. SOLUTION: The surface roughness of a welding wire in the longitudinal direction (L direction) is stipulated so that tp (L/Cv=30)=55-95% and Ra(L)=0.08-0.22μm (measurement condition: cut off valueλc=0.8 mm, reference length (l)=0.80 mm, evaluation length In=400 mm) are satisfied, wherein a loading length rate tp is (L/Cv), a cutting level is Cv, an arithmetic average roughness is Ra(L). The tp (L/Cv=30) and the Ra(L), by using a tracer type surface roughness meter (needle tip 5μm), are obtained as average values of measured values at 8 places at a 45 deg. interval in the circumferential direction of the wire in the longitudinal direction. |
