| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding wire for the use of gas shielded arc welding, which can secure full mechanical strength of weld metal in performing welding of high heat input and high interpass temperature and can prevent deterioration of toughness or generation of crack in performing welding of low heat input condition, and also to make smooth feeding possible for the welding wire in performing continuous high current welding. SOLUTION: The welding wire has composition that satisfies the following equations (1)-(7): DE=C%+Mn%/6+Si%/24 (1); AE=Mo%/4+Cr%/5+Ni%/40 (2); 0.32<(0.7×DE+0.8×AE) (3); (DE+AE)<0.50 (4); 0.1<AE/DE (5); Pcm=C%+Mn%/6+Si%/30+(Cr%+Cu%)/20+Ni%/60+Mo%/15+5B% (6); and Pcm+760B%<2.5 (7). Also, the welding wire has a solid lubricant layer comprising 15-70% total of one or two of MoS<SB>2</SB>and BN, 2% or less wax, 2-70% K compound, and 5-70% or less copper powder, as well as a surface lubricant layer comprising fatty acid ester and/or lubricant oil on the surface of the solid lubricant layer. COPYRIGHT: (C)2004,JPO&NCIPI
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