On the base of orthogonal comparison tests, influences of many kinds of factors on the cracking sensibility of plasma clad coatings have been studied in this paper.

Many studies were carried on the technologies and properties of laser cladding on the seal face of valve, but lack of contrast data with plasma spraying Alloy applied at present.

The effect of coating on anti corrosion has been studied, which is formed by laser cladding and plasma spurt welding on metal base of anti acid stainless steel.