Surface Deposition And Numerical Simulation On The Large Spot Semiconductor Laser TIG Composite Heat Resource

According to the difficulties that it is hard to realize the alloy power melting, the differences in the temperature distribution in interface area, the paper was proposed the method of composite with large spot semiconductor laser and TIG arc. The method was adopted in high-performance alloy powder surface cladding. Through the control of the coupling form of laser with electric arc and parameters matching, reasonable regulation and control the characteristics of the composite heat source and the temperature distribution can be controlled, and the requirements can be met with the parameters metal powder in the different thermal physical in the process of cladding. This article mainly studied on the large spot semiconductor laser TIG composite heat and the heat source model. It mainly dwells on the following aspects:(1) Based on the characteristics of large spot laser, TIG arc and the composite of those two heat sources, the working platform was built, and the cladding on the surface of composite heat sources was realized. Through one single layer cladding experiment and the thermal cycle curves carried out, advantages and disadvantages were studied on the small focus CO2 laser heat source and the big spot semiconductor laser heat source on the surface cladding.By using the same methods, welding parameters, coupling modes have an effect on surface morphology and the influence of the temperature field distribution with the single laser heat source and the composite of the big spot semiconductor laser and TIG arc heat source. Because of the difference between the laser heat resource and the TIG heat resource, the large temperature gradient of the molten pool can be reduced with the composite of those two resources, besides the issue of stress concentration can be eased. Through regulating arc heat source characteristics, the demand of laser heat for low temperature area can be satisfied.(2) The heat transfer process of cladding in different heat source laser and the composite of laser with TIG was analyzed. Based on the thermal conduction equations,the heat source models of the laser and the composite of the large spot laser and TIG were built. A finite element method was used to estimate the temperature distributions with ANSYS in the two different heat resources. The numerical simulation had consistent result with experiment.(3) Based on the heat source models of the laser and the composite of the large spot laser and TIG, welding parameters and the influence on the heat transition by powder addition on the cladding surface. The results showed that the laser temperature gradient is big during the deposited process, while the composite of the large spot laser and TIG can obviously reduce the cladding temperature gradient. As the TIG arc was introduced into the deposited system, the laser absorption rate of the deposit system obviously increased. The numerical simulation had consistent result with experiment.