摘要
采用不同焊接电流的CO2焊对Q345(δ=4 mm)结构钢分别进行了连续焊和脉冲焊焊接试验,并对焊接接头外观形貌、热影响区尺寸、显微组织和显微硬度进行对比分析。结果表明:连续焊的焊缝比脉冲焊的焊缝粗大;脉冲焊接头热影响区尺寸小于连续焊接头热影响区尺寸;脉冲焊焊接接头组织比连续焊更为均匀,且产生魏氏组织较少;两种焊接工艺条件下的焊接接头显微硬度峰值均位于过热区,连续焊接头各部位显微硬度均略高于脉冲焊接头。
CO2 welding with different welding current was applied to Q345 steel plate （ δ = 4 mm） for continuous welding and pulse welding test. The appearance, HAZ size, microstructure and microhardness of welded joint were analyzed and compared in this paper. The results show that the weld of continuous welding is thicker than pulse welding. Pulse welding causes less HAZ dimensions comparing with continuous welding. The welded joint structure forms more evenly and obtaining less widmanstatten structure by pulse welding comparing with that one. Under two welding procedure, both of mierohardness peak value of welded joints are located within overheated zone. Macrohardness of each welded joint part acquired by continuous welding method is slightly higher than that of pulse welding.
出处
《电焊机》
北大核心
2014年第5期213-216,共4页
Electric Welding Machine
基金
西南石油大学自然科学基金项目(2012XJZ039)
