Influence of Processing Parameters on Geometrical Features of Powder Feeding Laser Cladding

The influences of laser processing parameters with auto-feeding on the geometrical features of cladded coating by cladding Ni60A powders on steel Q235 plate have been investigated.The rules of the combined parameters (such as laser energy density P_w, interaction time T, powder feeding rate and scanning speed V_s) on the sizes of the coatings have been amphatically discussed.In order to express the relationship between the processing parameters and the macroquality of cladded coating,the equation expressing the relationship between the covering rate and the processing parameters was derived. By varying the powder feeding rate and scanning speed under definite laser power and beam spot dimensions, coatings with different thickness were obtained.The covering rate was calculated approximately based on metallographical measurement. The results show that the cross-section S, width variable and contact angle are mainly controlled by the laser energy density and interaction time, they all become larger with the increase of laser energy density and interaction time.