Non-consumable electrode type arc welding apparatus

A non-consumable electrode type arc welding apparatus comprising:

• a torch comprising an electrode portion and a nozzle provided around an outer periphery of the electrode portion such that a gap is formed between the electrode portion and the nozzle;
• a gas supply that supplies a shielding gas to the torch, the shielding gas flowing through the gap between the electrode portion and the nozzle;
• a first power source that applies a voltage between the electrode portion and the nozzle to generate a pilot arc;
• a second power source that applies a voltage between the electrode portion and a work to generate a main arc;
• and
• a controller that controls the first power source and the second power source,
• wherein the electrode portion comprises an electrode and an electrode holding portion holding a base portion of the electrode,
• the electrode holding portion comprises a protrusion protruding toward the nozzle from a side facing the nozzle, and
• the torch comprises a moving mechanism configured to move the electrode portion in a longitudinal direction inside the torch such that the protrusion and the nozzle contact and separate from each other.