Murata Welding Laboratories, Incorporated

Manabu Tanaka

Akihisa Murata

Tadasuke Murata

The present invention enables even a beginner to acquire the technique easily and perform suitable spot welding, and achieves improved workability, improved welding quality, improved productivity, and the like. The present invention includes a torch bodyfor passing a shielding gas, a tungsten electrode rodinserted into the torch bodyand connected to a cathode, a constricted nozzlefor supporting a distal end portion of the tungsten electrode rodconcentrically, defining a gas passagebetween the tungsten electrode rodand the constricted nozzlefor flowing a shielding gas G, and discharging the shielding gas G from the constricted nozzleat a higher speed than the shielding gas G discharged from the distal end of the torch body, and a cylindrical electrode nozzlehaving conductivity arranged concentrically with the tungsten electrode rodon the outer circumference of the constricted nozzle, connected to the anode via a ground cable, and configured to have a tapered shape at a distal end portion, wherein the tapered distal end portion is located further outside than the distal end portion of the tungsten electrode rod, gas vent portsandof the shielding gas G are provided on the electrode nozzle

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Takatsuki, Japan

Manabu Tanaka