Plasma welding torch, and welding method using plasma welding torch

A welding method using a plasma welding torch,

• the plasma welding torch comprising:
• a non-consumable electrode that forms a plasma arc between a base material and the non-consumable electrode;
• and
• a nozzle, through which inert gas flows,
• the nozzle including:
• a first orifice having the non-consumable electrode accommodated therein, and being open to the outside;
• and
• a second orifice extending along a direction at a predetermined angle with the non-consumable electrode from a part of the first orifice, and being open to the outside;
• the welding method comprising the steps of:
• moving the plasma welding torch in a predetermined direction with respect to the base material;
• causing the inert gas to flow through the first orifice;
• forming a plasma arc between the base material and the non-consumable electrode, through the first orifice, using a portion of the inert gas as plasma gas;
• and
• ejecting a portion of the rest of the inert gas, as shield gas, onto at least the base material in the predetermined direction through the second orifice.