Torch nozzle and torch nozzle set

A torch nozzle set comprising multiple torch nozzles that includes at least a first torch nozzle and a second torch nozzle, wherein

• each of the multiple torch nozzles
• has an accommodating part that accommodates a tungsten electrode to perform arc discharge between it and a base metal and discharges a shielding gas from a gap between the tungsten electrode and the accommodating part, and
• has a mounting part formed at its rear end that is configured to detachably attached to a common torch,
• the first torch nozzle has a receiving port installed that receives a specific gas having a different role from the shielding gas, and playing a role of moving a molten base metal, through a specific gas pipeline that is common for the first torch nozzle and the second torch nozzle, wherein
• a discharge groove is formed on a base metal side end of an approximately cylinder, and
• the specific gas is discharged from the discharge groove, and
• the second torch nozzle has a receiving port installed that receives a specific gas having a different role from the shielding gas, and playing a role of moving a molten base metal, through the specific gas pipeline, wherein
• the shielding gas and the specific gas are both inert gases, and
• the specific gas is discharged together with the shielding gas from a gap between the tungsten electrode and the accommodating part.