Kabushiki Kaisha Yaskawa Denki

Other

Haruki Nakashima

Shinji Okumura

Yasuhiro Koga

Hiroyuki Handa

Takahide Hirayama

Tsuneo Mita

Takafumi Mitsushio

Satoru Nio

An arc welding method which suppresses sputtering and which makes it possible to obtain a smooth bead penetration surface shape as in MIG or MAG welding, without producing undercuts or bumping beads. A carbon dioxide gas welding method effecting welding at welding rates of about not less than 1.5 m/minute using a consumable electrode and a welding power source having a control means for opening a short circuit at a rate of at least about 500 A/msec on detection of such short circuit, wherein welding is effected with a proper volume of globules under the welding conditions obtained by computing a welding voltage corresponding to the proper volume of globules by a first formula representing the relationship between the welding wire feed rate, the welding voltage and the volume of globules traveling to a pond of weld as the welding wire is melting and a second formula representing the relationship between the wire feed rate, the welding voltage, and the period of globules traveling to a pond of weld as the welding wire is melting.

High speed carbon dioxide gas welding method

A welding voltage is determined based on an expression, P&equals;k &times;Vw &plus;k &times;Vw, where, with a welding wire feed speed and a welding wire radius used as inputs, a power factor is P(kW), the a melting speed of a welding wire is Vw(g/sec), and k and k are constants(k &equals;0.898 and k &equals;4.625).

High-speed CO2 gas welding method

The welding method according to the present invention is adapted to carry out a welding operation by feeding a welding wire to a material to be welded, and generating an arc between the material to be welded and welding wire, in which the welding is done with the welding wire feeding speed increased and reduced during the welding operation, the welding wire feeding speed being reduced after the occurrence of short-circuiting is detected, the welding wire feeding speed being increased after the cancellation of the short-circuiting and the transfer of the welding operation to the formation of the arc are detected.

Consumable electrode type arc welding method and device therefor

Growing community of inventors

Kitakyushu, Japan

Haruki Nakashima