补焊道次对Q345B低合金钢焊接接头疲劳性能的影响  

Effects of Repairing Welding Passes on Fatigue Property of Butt Joints of Q345B Low-Alloy Steel

作　　者：吴晓明[1] 张艳辉[1] 钮旭晶[1,2] 郝晓卫[1] 马富强[1] 

机构地区：[1]唐山轨道客车有限责任公司,唐山063035 [2]大连交通大学材料科学与工程学院,大连116028

出　　处：《机械工程材料》2012年第11期69-71,75,共4页Materials For Mechanical Engineering

摘　　要：通过脉动拉伸试验研究了补焊道次对Q345B低合金钢焊接接头疲劳性能的影响。结果表明:与未补焊的接头相比,一次补焊后焊接接头的中值疲劳强度值略有下降(差4.6 MPa);二次补焊和一次补焊的中值疲劳强度基本相当,仅差0.7 MPa;疲劳裂纹启裂区和扩展区具有典型的疲劳断裂特征,终断区形貌为准解理和少量浅韧窝。The effect of repairing welding passes on the fatigue property of Q345B low-alloy steel by pulsating fatigue test. The results show that the fatigue strength of once-repairing welding decreased slightly （only for 4. 6 MPa） comparing with that of non-repairing welding, and the fatigue strength of second-repairing welding basically match to that of once-repairing welding, the difference between them was only 0. 7 MPa. The eraekinitiation and propagation area of fatigue crack had the typical fatigue fracture characteristics, fatigue end broken area morphology was quasi-cleavage and little dimple.

关 键 词：Q345B低合金钢 补焊 焊接接头 疲劳性能 

分 类 号：TG146[一般工业技术—材料科学与工程]