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AssigneeDAIHEN Corporation
InventorsTomoyuki Ueyama, Shoji Harada, Toshiaki Nakamata, Masuo Shibata, Toshimitsu Doi, Shunichi Ogawa, Ichiro Matsumoto, Hiroshi Nakai
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An MAG arc welding method and apparatus is capable of achieving a welding bead in a regular ripple pattern or in a suitable sectional form. The welding power source generates the first welding current I1 and a second welding current I2 larger than the first welding current. The wire melting speed is changed by switching between the first and the second welding currents. The welding method or apparatus according to the invention generates the first arc length more than 2 mm and the second arc length more than the first arc length and switches between both arc length at a switching frequency F of 0.5 to 25 Hz. The ratio of the second to the first welding currents is made to be in 1.03 to 1.20. In addition to a welding method to change the arc length by switching the first and the second welding currents at a constant wire feeding rate, the present welding method makes it possible to carry out the lap welding or butt welding even when there is a large gap. The large gap requires a large amount of molten metal which is prepared by increasing the wire melting speed caused by an increase in the wire feeding rate by 5 to 20%. The resultant reinforcement has a beautiful appearance.
A MAG arc welding method for achieving a molten metal transfer by changing an arc length while feeding a consumable wire at a predetermined wire feeding rate and suppressing a change in an arc force said method comprising the steps of:
The MAG arc welding method according to claim. 5, wherein said first pulse current parameters are set to generate a first molten metal transfer from said consumable wire to a welding material at a first transfer rate of one molten metal drop every plurality of first current pulses, said first molten metal transfer being synchronized with said first current pulses, and said second pulse current parameters are set to generate a second molten metal transfer from said consumable wire to said welding material at a second transfer of one molten metal drop every one second current pulse, said second molten metal transfer being synchronized with said second current pulses.
Dependencies are inferred from the claim text.