Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Toshihiko Watanabe

Naoki Takeuchi

Tokuji Maruyama

Mitsurou Soga

Naoki Takenouchi

Ryuji Murai

Kouji Kawakami

Soichi Tsuruga

Tadatsugu Koishi

Yoji Ogata

Kazuo Murase

Masashi Nagashima

A welding DC power supply system suitable for consumable or non-consumable electrode welding, including plural inverter units for converting a first direct current into an alternate current and for rectifying the alternate current to produce an output of a second direct current; a circuit connecting the output of terminals of the inverter units in parallel; a detection circuit for detecting the total output current of the inverter units; and a circuit for varying the number of operating inverter units according to the value of the detected total output current. According to other aspects of the invention, the power supply system is further provided with a phase control means for controlling the phases of alternate currents produced by the respective inverter units, or means for selectively actuating a particular inverter unit or units in a short circuit period of large current in dip transfer welding, or feedback means for suppressing the current in a controlled timing in the final stage of each short circuit period to prevent spattering as caused by bursting rupture of the large short circuit current.

DC Welding power supply system

A welding machine is disclosed which includes a wire supply device, a wire coil, a flexible wire guide connected between the wire supply device and a torch nozzle and a welding assembly alterable in more than one welding position and mounted on a wheeled platform. The axis or width center position of the wire coil and the axis of a supply roll in the wire supply device or a supply slot in the supply roll are placed above the center line on the overall width of the wheeled platform. Both handed welding is possible by switching the torch between the left handed side and right handed side of the wheeled platform.

Welding machine

A recovery type flux feeding assembly is disclosed. The assembly includes a virgin flux hopper and a waste flux hopper with a flux feed conduit connected to the bottom of the waste flux hopper. The hoppers are separated by a drop stop which selectively permits flux from the virgin flux hopper to enter the waste flux hopper so that the flux exiting through the flux feed is a mixture of the two. A flux return assembly consists of a flux recovery port positioned adjacent the waste flux from the weld, a cyclone attached to the top of the waste flux hopper and a conduit connecting the two. An air injector injects air into a midpoint of the conduit between the flux recovery port and the cyclone so that the cyclone is kept at a positive pressure and the waste flux therein is not sucked out. Conduits are included between the tops of the hoppers for equalizing the pressures therebetween. In one embodiment, the virgin flux hopper surrounds and is entirely above the waste flux hopper while in another embodiment the two are adjacent and on substantially the same level.

Recovery type flux feeding assembly

A motor-driven welding machine capable of holding and carrying a welding torch stably along a welding line, the machine including adjusting means for varying the mounting position of a welding torch or the inter-axle distance of carriage wheels according to the type of the welding torch to be held thereon. The machine further includes means for allowing or stopping oscillatory or pivotal movements of the welding torch in horizontal and vertical planes and means for steering the carriage wheels in relation with the oscillatory movements of the torch.

Motor-driven welding machine

An arc welding machine having a strap sliding to advance with advance of the welding position, wherein an electric conductor is disposed on the strap at a position not facing a welding groove with the electric conductor being insulated from the strap, and electric current being applied to the electric conductor while it is being cooled by water, to thereby control the arc direction.

Growing community of inventors

Kamakura, Japan

Toshihiko Watanabe