【摘要】 焊接气孔作为一种典型的焊接冶金缺陷,为研究热输入对焊缝气孔缺陷生成的影响,采用双脉冲MIG焊技对厚度为3mm的6082铝合金薄板进行对接连接,并基于ANSYS软件平台对焊接温度场进行非线性分析与模拟。研究表明,铝合金双脉冲MIG焊所生成的气孔缺陷主要聚集在熔合线以及中心线附近;且在一定热输入范围内,随着焊接热输入的增大,最高加热温度与熔池熔点温度以上停留时间相应增加,一方面促进了气泡逃逸,另一方面减少外部杂质气孔在焊缝中残留的可能性,抑制气孔缺陷的形成。更多还原

【Abstract】 To study the influence of heat input on welding porosity, a typical welding metallurgical defect, the dual-pulse MIG welding technology is used to connect the 6082 aluminum alloy sheet with a thickness of 3 mm, and the non-linear analysis and simulation of the welding temperature field are performed based on the ANSYS software platform. The results show that the pore defects generated by dual-pulse MIG welding of aluminum alloys are mainly concentrated near the fusion line and the center line, and the residence time of maximum heating temperature above the melting point of the melting pool increases with the welding heat input quantity in a certain range, which promotes the escape of bubbles and reduces the possibility of external impurities and pores remaining in the weld, inhibiting the formation of pore defects.更多还原