| 摘要 |
PURPOSE:To provide a titled steel wire for welding which assures welding at high quality, by contg. C in a specific compsn. range in the wire to be used for root pass welding of ultralow carbon steel thereby obtaining weld metal contg. a proper amt. of C. CONSTITUTION:The content of C in a steel wire for gas shielded metal arc welding to be used for root pass welding of ultralow carbon steel contg. about 0.005-0.06wt% C is specified in a 0.20-0.34% range, whereby weld metal having low sensitivity to high temp. cracking is obtained and the welding at high quality is made possible. The content of C in said welding wire is limited by the following reason: The wire is required to contain >=0.20% C in order to weld steel materials contg. about 0.005% C at about >=50cm/min welding speed and to maintain the content of C in the weld metal at >=0.10% i.e. the limit for generation of cracking, and the upper limit of the content of C in the wire is specified at 0.34 as it is necessary to maintain the content of C in the weld metal at about <=0.15% to satisfy requirements for hardness and toughness. |
