Management method of powder supply head, and method and apparatus for forming erosion shield

A management method of a powder supply head which has a double tube in which an inner circumference side tube that sprays a cladding metal used for cladding by welding using a laser and an outer circumference side tube that is disposed at an outer circumference of the inner circumference side tube and sprays a shielding air overlap concentrically, and supplies the cladding metal to a cladding portion, the method comprising:

• a spraying process of spraying the cladding metal from the powder supply head to a test region under set conditions and forming a line segment by the cladding metal sprayed to the test region;
• a width measurement process of measuring a width of the cladding metal sprayed onto the test region;
• a determination process of, in a case where the measured width of the cladding metal is an allowance or smaller, determining that the powder supply head is usable, and in a case where the measured width of the cladding metal is greater than the allowance, determining that the powder supply head is unusable.