Abstract: The cracking of coatings and the deformation of base frustrate the application of laser cladding technology especially on surface of the ring circular orbit. In order to solve the two problems above, the stress and strain fields of the laser cladding process on the ring circular orbit were analyzed through the finite-element method, based on the temperature field. The wedge module of the ring circular ring was the subject investigated. The calculating results show that during the cladding process the crank point tends to generate the transversal crack; the centre point on the coating/base interface tends to generate longitudinal crack; the intersecting edge of the coating and base tends to generate toe crack. Moreover, the cracking tendency of the outer marginal point is obviously greater than that of the inner marginal point. The rather high stress appears at the border position where the constraint exists, and the stress on the point in front of molten pool under the range of laser irradiation is large as well. And the displacement becomes larger as the cladding process proceeds. © Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg 2011.

Key words: Circular orbit; Laser cladding; Stress and strain field