Electron beam welding of Ti-15-3 alloy to 304 stainless steel （STS） using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding pro...Electron beam welding of Ti-15-3 alloy to 304 stainless steel （STS） using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding process were numerically simulated and experimentally measured. The results show that the rotated parabola body heat source is fit for the simulation of the electron beam welding. The temperature distribution is asymmetric along the weld center and the temperature in the titanium alloy plate is higher than that in the 304 STS plate. The thermal stress also appears to be in asymmetric distribution. The residual tensile stress mainly exists in the weld at the 304 STS side. The copper filler metal decreases the peak temperature and temperature grade in the joint as well as the residual stress. The longitudinal and lateral residual tensile strengths reduce by 66 MPa and 31 MPa, respectively. From the temperature and residual stress, it is concluded that copper is a good filler metal candidate for the electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel.展开更多
In this paper, the common heat source model of point and linear heat source in the numerical simulation of electron beam welding （EBW） were summarized and introduced. The combined point-linear heat source model was ...In this paper, the common heat source model of point and linear heat source in the numerical simulation of electron beam welding （EBW） were summarized and introduced. The combined point-linear heat source model was brought forward and to simulate the welding temperature fields of EBW and predicting the weld shape. The model parameters were put forward and regulated in the combined model, which included the ratio of point heat source to linear heat source Qpr and the distribution of linear heat source Lr. Based on the combined model, the welding temperature fields of EBW were investigated. The results show that the predicted weld shapes are conformable to those of the actual, the temperature fields are reasonable and correct by simulating with combined point-linear heat source model and the typical weld shapes are gained.展开更多
Electron beam welding of QCr0. 8 chromium bronze was ineestigated to improve weld appearance and reduce the size of softened zone of the joints. Effect of forced cooling on weld appearanee and microhardness of the joi...Electron beam welding of QCr0. 8 chromium bronze was ineestigated to improve weld appearance and reduce the size of softened zone of the joints. Effect of forced cooling on weld appearanee and microhardness of the joints was studied by both experiment and numerical simulation. Both welding with and without forced cooling were conducted and analyzed comparatively. The results showed that a quasi steady state temperature.field and a large temperature gradient perpendicular to welding direction could achieved by forced cooling. A consistent weld width throughout the entire weld and smooth surface for both the top and bottom was achieved by forced cooling process. The width of softened zone of the joint was reduced from 2. 6 mm to I mm by forced cooling.展开更多
对板厚10 mm AZ61镁合金板材进行了真空电子束焊接数值模拟研究.利用有限元模型以及三维移动双椭球热源模型,采用数值模拟的方法研究了电子束流与焊接过程温度场及焊缝熔深之间的关系.结果表明,建立的模型能够获得电子束深熔型焊接的效...对板厚10 mm AZ61镁合金板材进行了真空电子束焊接数值模拟研究.利用有限元模型以及三维移动双椭球热源模型,采用数值模拟的方法研究了电子束流与焊接过程温度场及焊缝熔深之间的关系.结果表明,建立的模型能够获得电子束深熔型焊接的效果,模拟焊缝成形及焊缝区、热影响区温度场分布与试验焊缝成形及实际电子束焊接特点较为一致,这也证明了该模型在AZ61镁合金电子束平板对焊有限元模拟中有较好的适用性.展开更多
基金Foundation item:Project (2010CB731704) supported by the National Basic Research Program of ChinaProject (51075189) supported by the National Natural Science Foundation of China
文摘Electron beam welding of Ti-15-3 alloy to 304 stainless steel （STS） using a copper filler metal was carried out. The temperature fields and stress distributions in the Ti/Fe and Ti/Cu/Fe joint during the welding process were numerically simulated and experimentally measured. The results show that the rotated parabola body heat source is fit for the simulation of the electron beam welding. The temperature distribution is asymmetric along the weld center and the temperature in the titanium alloy plate is higher than that in the 304 STS plate. The thermal stress also appears to be in asymmetric distribution. The residual tensile stress mainly exists in the weld at the 304 STS side. The copper filler metal decreases the peak temperature and temperature grade in the joint as well as the residual stress. The longitudinal and lateral residual tensile strengths reduce by 66 MPa and 31 MPa, respectively. From the temperature and residual stress, it is concluded that copper is a good filler metal candidate for the electron beam welding of Ti-15-3 titanium alloy to 304 stainless steel.
基金co-supported by the National Basic Research Program (No.61362)the National Natural Science Foundation of China(No. 50935008 and 10902113)Science Foundation of Aeronautics (No. 2010ZE25006)
文摘In this paper, the common heat source model of point and linear heat source in the numerical simulation of electron beam welding （EBW） were summarized and introduced. The combined point-linear heat source model was brought forward and to simulate the welding temperature fields of EBW and predicting the weld shape. The model parameters were put forward and regulated in the combined model, which included the ratio of point heat source to linear heat source Qpr and the distribution of linear heat source Lr. Based on the combined model, the welding temperature fields of EBW were investigated. The results show that the predicted weld shapes are conformable to those of the actual, the temperature fields are reasonable and correct by simulating with combined point-linear heat source model and the typical weld shapes are gained.
文摘Electron beam welding of QCr0. 8 chromium bronze was ineestigated to improve weld appearance and reduce the size of softened zone of the joints. Effect of forced cooling on weld appearanee and microhardness of the joints was studied by both experiment and numerical simulation. Both welding with and without forced cooling were conducted and analyzed comparatively. The results showed that a quasi steady state temperature.field and a large temperature gradient perpendicular to welding direction could achieved by forced cooling. A consistent weld width throughout the entire weld and smooth surface for both the top and bottom was achieved by forced cooling process. The width of softened zone of the joint was reduced from 2. 6 mm to I mm by forced cooling.
文摘对板厚10 mm AZ61镁合金板材进行了真空电子束焊接数值模拟研究.利用有限元模型以及三维移动双椭球热源模型,采用数值模拟的方法研究了电子束流与焊接过程温度场及焊缝熔深之间的关系.结果表明,建立的模型能够获得电子束深熔型焊接的效果,模拟焊缝成形及焊缝区、热影响区温度场分布与试验焊缝成形及实际电子束焊接特点较为一致,这也证明了该模型在AZ61镁合金电子束平板对焊有限元模拟中有较好的适用性.
