Effect of wire feeding angle and wire feeding mode on the formation of single-track laser wire deposition layer

In order to study the influence of the direction of the welding wire into the molten pool on the formation of the deposited layer during the laser additive manufacturing by paraxial wire feeding, single-track laser wire deposition tests were carried out under different wire feeding angles and wire feeding modes. The variation of layer width, layer height, surface roughness, cross-sectional morphology and substrate fusion depth of deposited layer with wire feeding angle and wire feeding mode was analyzed. The results show that the wire feeding angle and wire feeding mode of paraxial wire feeding influence the formation of single-track laser deposited layer, and the effect of wire feeding mode on the size and shape of deposited layer is greater than that of wire feeding angle. With the increase of wire feeding angle, all the substrate fusion depth decreases gradually, the layer width of front feeding and back feeding decreases gradually, the layer height of deposited layer increases gradually, however, the layer width, layer height and surface roughness of side feeding change little. The cross-section shape of front feeding and back feeding deposited layer is symmetrical and circular, while the cross-section shape of side feeding deposited layer is asymmetrical and the highest point is biased towards the wire side. The layer width and substrate fusion depth of front feeding are larger and the layer height is smaller, while the layer width and substrate fusion depth of the back feeding are smaller and the layer height is larger.