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AssigneeHitachi Construction Machinery Co., Ltd.
InventorsShigeyuki Sakurai, Yutaka Takano, Naoki Miyanagi, Yoshiaki Shimomura, Hikaru Yamamoto, Toru Takatani
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In an arc welding method and apparatus, a plasma (13) is generated at a welding intended position on a base material (2) by a laser (16) irradiated to the base material (2). When a discharge electrode (12) is at a minus potential, an arc discharge (4) takes place in the direction of the plasma (13) and is induced at a position irradiated with the laser (16). When the electrode (12) is at a plus potential, arc electrons are generated from a laser irradiated point and discharged to the electrode (12). When a voltage applied between the electrode (12) and the base material (2) is alternating, the polarities of the electrode (12) and the base material (2) alternately change so that the foregoing phenomena alternately occur. When the base material (2) is at a minus potential, an arc discharge (4) takes place from a laser spot. Also, in regard to the arc discharge (4), since the plasma (13) is generated by the laser (16), a stable arc discharge (4) can be generated irrespective of the state of the base material (2) or the state of the electrode (12).
An arc welding method for welding at an intended position on a surface of an object to be welded by irradiating a laser to said intended position, and welding at said intended position, comprising the steps of:
An arc welding apparatus for irradiating a laser to an intended position on a surface of an object to be welded, and for welding at said intended position, comprising:
Dependencies are inferred from the claim text.