The Process Of Titanium Alloy-Stainless Steel Dissimilar Metal Laser Welding Through The Finite Element Analysis And Experiment Test

Due to the excellent performance, titanium alloy continuously replace some stainless steel material of workpiece in the industry to improve the performance of workpiece.The most common way of connecting the two materials is welding, but there are big differences between titanium alloy and stainless steel in chemical composition and physical properties, thus causing poor welding performance. By the rapidly development of laser technology, the advantages of the concentration of heat source, relatively small heat input, and heat source easily-precise control of heat source make it get more and more popularly applied in the welding industry. Now in the modern industry, researchers put more emphasis on the application of dissimilar metal laser welding emphasis project.In this paper, the-dissimilar metal laser welding of TA15 titanium alloy and 304 stainless steel is studied. On the basis of predecessors’ research, and in view of the specialty of the titanium alloy- stainless steel dissimilar metal welding two methods of welding experiments are put forward, one is direct welding with the laser beam deviating to the side of the stainless steel, and the other is padding a copper layer between titanium alloy and stainless steel for welding.First of all, the temperature field of titanium alloy- stainless steel dissimilar metal directly laser welding is simulated by the ANSYS finite element analysis software. The distribution of temperature field on the both side of titanium alloy and stainless steel is asymmetrical with the peak temperature of both sides at the same time is different, and the temperature of the both sides’ nodes at the same distance away from the weld is not uniform. After introducing the partial coke, the temperature of the partial coke value from 0.2 mm to 0.8 mm is simulated respectively. By analyzing the distribution of temperature field with different partial coke value, can arrive at the conclusion that the reasonable partial coke value is 0.5 mm ~ 0.7 mm. In addition, by simulating the temperature field of titanium alloy- stainless steel laser welding with the layer thickness of copper varing from 0.1 mm to 0.8 mm. The results show that the copper can decrease melt volume of the titanium alloy and stainless steel both sides, and the cooling speed is faster. Analyzing the temperature field distribution of the different layer thickness of copper on the whole, it shows that the reasonable thickness of copper layer between titanium alloy- stainless steel dissimilar metal laser welding is 0.5 mm ~ 0.7 mm.Based on the results of ANSYS finite element software simulation analysis, experiments of the titanium alloy- stainless steel dissimilar metal welding sample with the partial coke value ranging from 0.3 mm to 0.7 mm and the thickness of copper layer varying from 0.5 mm to 0.7 mm are carried out respectively. After the observation of the experiment of welding sample, mechanical property test and SEM test, and analyzing the test data integrally, it shows that the samples of titanium alloy-stainless steel dissimilar metal laser welding will obtain excellent forming conditions and mechanical performance when the partial coke value ranging from 0.5 mm to 0.6 mm and the thickness of copper layer between 0.5 mm to 0.6 mm.