| 摘要 |
PROBLEM TO BE SOLVED: To obtain an excellent bead external shape when high-speed welding is carried out with an electrode minus polarity current ratio set to a large value in AC pulse arc welding using a flux-cored wire.SOLUTION: A method includes: feeding a flux-cored wire; supplying an electrode minus polarity base current in an electrode minus polarity base period; then supplying an electrode minus polarity peak current Ipn in an electrode minus polarity peak period Tpn; and then supplying an electrode plus polarity peak current in an electrode plus polarity peak period, one cycle of supplying those welding currents Iw being repeated. An oscillation frequency fs of the electrode minus polarity peak current Ipn is set to be higher as a welding speed is faster. Consequently, the oscillation frequency fs becomes higher as the welding speed becomes faster, so droplets which move increase in number and decrease in size, so that an excellent bead external shape can be obtained. |
