Welding device

A welding device for welding outer peripheral edges of two irregular shaped plates which are overlapped, and the welding device comprising:

• a rotary table to which the two irregular shaped plates in an overlapped state are fixed;
• a torch unit, including a welding torch positioned to face the outer peripheral edges of the two irregular shaped plates fixed to the rotary table;
• an after-shielding part, positioned downstream of the welding torch in a rotational direction of the rotary table and disposed on the welding torch, the after-shielding part having a plurality of nozzles arranged along the rotational direction and configured to jet a shielding gas to the outer peripheral edges, the plurality of nozzles including a first nozzle positioned upstream in the rotational direction and a second nozzle positioned downstream of the first nozzle in the rotational direction;
• a nozzle actuator, disposed on the welding torch and configured to rotationally move the second nozzle in a circumferential direction of the outer peripheral edges;
• and
• a controller, configured to control an orientation of the nozzle in a direction of decreasing a distance at which the shielding gas jetted from the second nozzle reaches the outer peripheral edges welded by the welding torch.