Experimental Analysis And Numerical Simulation Of Arc Welding On TiC_x-Cu(Al) Cermet

TiCx-Cu(Al) cermet, as a new type of metallic matrix composites developed in recent years, has the dual advantage of metal Cu and Ti3AlC2 ceramics, so it has a wider application. However, there is great difficulties to use TiCx-Cu(Al) cermet to manufacture complex shape or large size structural components due to this material was prepared by powder metallurgy method, which greatly limits the application of the material. Welding method used in this article is the best way to solve this problem.In this paper, arc welding tests of TiCx-Cu(Al) cermet were taken under the condition of different welding current density, different arc time, different joining pressure and different ceramic content, and then microstructure observation and phase analysis of the welded joint specimen area was carried out, the Four-point bending strength and resistivity of welding samples were tested. Analysis of the microstructure of the welded joint specimen area revealed the changes of the organization and the changes in phase composition of TiCx-Cu(Al) cermet under the condition of different welding parameters.In this paper, by using the finite element analysis software ANSYS, heating process of welding was simulated to study the effects of different welding current density, different arc time, different ceramic content on the impact of temperature distribution within the material, and to determine the best range of welding parameters combined with the test. In addition, as the welding process is a typical transient nonlinear heat conduction problem, the welding samples after cooling will have a greater residual stress, so this paper simulated stress distribution inside the material during the heating process under the condition of different welding current density, different arc time, and different ceramic content by using the indirect method.This study shows that with the increased density of the welded joint specimen area, the weld strength of the sample between TiCx-Cu(Al) cermet can exceed the strength of base metal; the main phases of the welded joint zone are Cu(Al) alloy and TiCx ceramics; resistivity of ideal welded joint specimen is lower than the resistance of the basic metal; in a certain range of welding parameters, the welding specimens can have a high-performance, the optimum range of parameters is slightly different for different ceramic content TiCx-Cu(Al) cermet; the morphology of the weld pool can be more intuitive performanced by the stress contour, and at the bottom position of the weld pool is the place where has the maximum stress, and here are the most likely areas of residual stress after the welding material cooled to room temperature.