| 摘要 |
PROBLEM TO BE SOLVED: To provide an arc welding method with which high electric current and high welding equal to or above those with a plurality of torches are achieved with one torch while maintaining high speed wire feed, also, the high speed rotation of the tip of the wire is suppressed, production of spatters is greatly reduced, and a stable welding can be performed. SOLUTION: In the consumable electrode type arc welding method with which an arc is generated between a welding wire 3 and a workpiece 7 so as to perform welding of a workpiece 7, using a mixed shielding gas comprising gaseous argon, when welding is performed to the workpiece 7 with a sheet thickness of≥8 mm in such a manner that the density of electric current flowing through the welding wire 3 is controlled to about≥300 A/mm<SP>2</SP>, at first, the welding wire 3 has a reverse polarity so as to be a plus pole, and thereafter, it is changed in such a manner that the welding wire 3 has a positive polarity so as to be a minus pole for at least one time. COPYRIGHT: (C)2011,JPO&INPIT |
