采用SYSWELD软件对Q345低合金钢板的匙孔型钨极气保焊(keyhole gas tungsten arc welding,KTIG)焊接过程进行了模拟,选用了3种形式的组合热源对K-TIG焊接过程的温度场进行数值模拟,并与实际焊缝轮廓进行对比,发现采用上半部分双椭球热...采用SYSWELD软件对Q345低合金钢板的匙孔型钨极气保焊(keyhole gas tungsten arc welding,KTIG)焊接过程进行了模拟,选用了3种形式的组合热源对K-TIG焊接过程的温度场进行数值模拟,并与实际焊缝轮廓进行对比,发现采用上半部分双椭球热源和下半部分3D高斯热源的组合热源所得温度场与实际情况较为相似.并通过K-TIG焊接数值模拟,分别研究板厚、间隙和焊接速度对K-TIG焊接接头变形和应力的影响.结果表明,减小焊接板厚有利于减小焊后z向变形和横向残余应力,留出适当的间隙有利于减小焊后残余应力,增大焊接速度有利于减小焊后变形,但不利于控制焊后残余应力.展开更多
Keyhole gas tungsten arc welding(K-TIG)of Q345 low alloy steel plates was simulated by using SYSWELD software.The temperature field of the K-TIG welding process was simulated with three different combined heat sources...Keyhole gas tungsten arc welding(K-TIG)of Q345 low alloy steel plates was simulated by using SYSWELD software.The temperature field of the K-TIG welding process was simulated with three different combined heat sources and was compared with the weld profile that was obtained experimentally.The temperature field that was obtained by a combination of a double ellipsoid heat source on the upper half and a three-dimensional Gauss heat source on the lower half was similar to the real situation.The effects of plate thickness,gap and welding speed on the deformation and stress of the K-TIG welded joints were investigated by K-TIG welding numerical simulation.A reduction in the thickness of the weld plates reduced the z-direction deformation and transverse residual stress;an appropriate gap reduced the residual stress and an increase in the welding speed reduced deformation after welding,but did not help to control the residual stress after welding.展开更多
文摘采用SYSWELD软件对Q345低合金钢板的匙孔型钨极气保焊(keyhole gas tungsten arc welding,KTIG)焊接过程进行了模拟,选用了3种形式的组合热源对K-TIG焊接过程的温度场进行数值模拟,并与实际焊缝轮廓进行对比,发现采用上半部分双椭球热源和下半部分3D高斯热源的组合热源所得温度场与实际情况较为相似.并通过K-TIG焊接数值模拟,分别研究板厚、间隙和焊接速度对K-TIG焊接接头变形和应力的影响.结果表明,减小焊接板厚有利于减小焊后z向变形和横向残余应力,留出适当的间隙有利于减小焊后残余应力,增大焊接速度有利于减小焊后变形,但不利于控制焊后残余应力.
基金Key Research and Development Project of Shandong Province(2016ZDJS05B03)Key Research and Development Project of Shandong Province(2017CXGC0812)。
文摘Keyhole gas tungsten arc welding(K-TIG)of Q345 low alloy steel plates was simulated by using SYSWELD software.The temperature field of the K-TIG welding process was simulated with three different combined heat sources and was compared with the weld profile that was obtained experimentally.The temperature field that was obtained by a combination of a double ellipsoid heat source on the upper half and a three-dimensional Gauss heat source on the lower half was similar to the real situation.The effects of plate thickness,gap and welding speed on the deformation and stress of the K-TIG welded joints were investigated by K-TIG welding numerical simulation.A reduction in the thickness of the weld plates reduced the z-direction deformation and transverse residual stress;an appropriate gap reduced the residual stress and an increase in the welding speed reduced deformation after welding,but did not help to control the residual stress after welding.
