Laser welding head

A laser welding head including a base unit thereof comprising:

• a shield gas injection nozzle that is provided to the base unit, irradiates laser light onto a target, and supplies a shielding gas to the target;
• a welding wire supply nozzle that is provided to the base unit and supplies a welding wire to the target, and
• a shielding gas cover which forms an air space by locally surrounding the target and wherein the laser welding head is configured for use in water, and each of the shield gas injection nozzle and the welding wire supply nozzle includes a main body section and a surface layer section that covers the main body section, and the surface layer section in the air space is entirely formed by at least one material selected from alloy composed of at least one metal carbide where the metal is selected from transition metals of the IV, V, VI group of the periodic table;
• cermet;
• ceramics;
• and MCrAlY alloy, wherein the surface layer section covers an entirety of the main body section in the air space, and the main body section extends from the base unit into the air space.