镀铜和无镀铜焊丝Q345E低合金钢焊接接头组织与力学性能研究  

Research of microstructure and mechanical properties of Q345E low alloy steel welded joint with copper-plated and non copper-plated welding wire

作　　者：孙逸凡 许鸿吉[1] 蔺博 SUN Yi-fan;XU hong-ji;LIN Bo(College of Material Science and Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning pro.,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《焊接技术》2020年第11期61-64,I0012,共5页Welding Technology

摘　　要：使用镀铜和无镀铜焊丝焊接Q345E低合金钢,并对其焊接接头进行拉伸、弯曲、显微组织分析、硬度和冲击试验,并扫描其断口形貌。结果表明:镀铜和无镀铜焊丝Q345E低合金钢焊接接头具有良好的拉伸性能和抗弯性能;无镀铜焊丝Q345E低合金钢焊接接头金相二次组织细小,粒状贝氏体较多,硬度测试结果相差不大;室温和低温冲击性能明显优于镀铜焊丝Q345E低合金钢焊接接头的。由冲击断口形貌可以看出:室温下冲击断口基本为韧性断裂,形貌为韧窝,低温下为解理断裂,有明显的解理特征。Q345 E low alloy steel was welded by copper-plated welding wire and non copper-plated welding wire.The room temperature tensile,bending,metallographic,hardness impact test of the welded joint were carried out and the fracture morphology was scanned.The results showed that Q345 E low alloy steel welded joint welded by non copper-plated welding wire had good tensile and bending properties and there were many fine-grained bainites in the secondary microstructure of Q345 E low alloy steel welded joint welded by non copper-plated welding wire,and the hardness test results were similar.The impact properties at room temperature and low temperature were significantly better than Q345 E low alloy steel welded joint welded by copper-plated welding wire.It could be seen from the impact fracture morphology that the impact fracture at room temperature was basically ductile fracture,the morphology was dimple,and the cleavage fracture at low temperature had obvious cleavage characteristics.

关 键 词：Q345E低合金钢 镀铜焊丝 无镀铜焊丝 显微组织 力学性能 

分 类 号：TG407[金属学及工艺—焊接]