Daihen Corporation

Shugo Hirota

Tetsuo Era

Shinichiro Nakagawa

Tomoyuki Ueyama

Toshiaki Nakamata

Kento Takada

Toshiro Uezono

Futoshi Nishisaka

Hiroyasu Mondori

Hideo Shiozaki

Norihito Takahashi

An arc start adjustment device adjusting an arc start procedure in a welding process comprises an obtainment unit that obtains welding data indicating a welding state during or after a welding process, and a procedure adjustment unit that adjusts the arc start procedure such that the cycle time of the welding process is shortened based on welding data obtained by the obtainment unit.

Arc start adjustment device, welding system and arc start adjustment method

An arc welding method includes the following steps. Pulse arc welding is performed with the welding wire being fed in a forward direction during a first period. Short-circuit transfer arc welding is performed with the welding wire being fed in the forward direction and the reverse direction during a second period. The first period and the second period are alternately switched. The switching of the first period to the second period is performed in a manner such that no transfer of a molten droplet of the welding wire occurs during the final pulse cycle of the first period.

Arc welding method

An arc welding method is described where pulse arc welding is performed with a welding wire being fed in a forward direction during a first period and short-circuit transfer arc welding is performed with the welding wire being fed in the forward direction and a reverse direction during a second period. The arc welding method alternately switches between the first period and the second period, where the switching of the first period to the second period is performed during a peak period of the pulse arc welding.

To start consumable electrode arc welding, an initial current is supplied to a welding wire after causing the welding wire to contact a base material and retracting the welding wire from the base material. Thereby, an initial arc is generated. The welding wire is retracted continuously for an initial arc lift period Ti with the initial arc maintained. Afterwards, the initial arc is switched to a steady arc. A predetermined weld pool formation period Tp is set after the initial arc lift period Ti. In the weld pool formation period, a weld pool formation current greater than the initial current is supplied with the initial arc maintained and the welding wire is caused to proceed and fed to the base material. In the weld pool formation period, a weld pool is formed by the initial arc without allowing the welding wire to release droplets and contact the base material.

Arc start control method

An arc start control method in robot welding includes the steps of shorting a welding wire with a base metal, retracting a welding torch by a welding robot for taking the welding wire off the base metal to generate an initial arc, retracting the welding torch to a predetermined position with maintaining the initial arc maintained while applying an initial arc current smaller than a steady welding current during this initial arc period, and starting to feed the welding wire steadily and to supply the steady welding current so as to make a transition from the initial arc to a steady arc as well as starting to move the welding torch along a welding line. During a re-shorting prevention period which starts from a beginning of the initial arc period, a re-shorting prevention current which is larger than the initial arc current is applied in order to prevent re-shortening between the wire tip and the base metal right after the initial arc was generated. Thereafter, the initial arc current is applied.

Arc start control method in robot welding

An arc start control method comprises starting advance of a welding wire, and determining that a distal end of a welding wire contacts a base material and short circuit is caused. If a feed torque value is a reference torque value or greater, the welding wire is retracted and the distal end of the welding wire is separated from the base material without generating an arc. If the feed torque value is smaller than the reference torque value the welding wire is retracted and the distal end of the welding wire is separated from the base material and an initial arc is generated between the welding wire and the base material.

A control method for AC pulse arc welding performed upon application of cyclic AC welding current is provided. The welding current has a cycle including an electrode negative polarity period and an electrode positive polarity period subsequent to the electrode negative polarity period. In the control method, an electrode negative polarity base current and a subsequent electrode negative polarity peak current are applied during the electrode negative polarity period. The electrode negative polarity base current has an absolute value smaller than a first critical value, and the electrode negative polarity peak current has an absolute value greater than the first critical value. Then, an electrode positive polarity peak current is applied during the electrode positive polarity period. The electrode positive polarity peak current has a value greater than a second critical value.

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Osaka, Japan

Shugo Hirota