焊接规范对14MnNbq钢焊接接头低温韧性的影响  

Effect of the welding parameter on the impact value of 14MnNbq steel welded joints at low temperature

作　　者：陈鹏[1] 王一戎[1] 车小莉[1] 

机构地区：[1]西南交通大学材料工程学院,四川成都610031

出　　处：《电焊机》2003年第9期48-49,共2页Electric Welding Machine

摘　　要：对国产新型桥梁用钢14MnNbq进行了焊接工艺性研究。分别就焊接线能量、层间温度变化对焊接接头的-30℃冲击韧性的影响进行了试验,并用光学显微镜和电子显微镜观察了接头组织。结果表明,中、小线能量焊接时,层间温度在80～200℃之间变化,焊接接头-30℃冲击韧性较好;线能量超过40kJ/cm时,接头冲击韧性明显下降。The experimental study on the fabrication weldabilily of14MnNbq steel is carried out.The influence of welding heat input and interpass temperature on the impact value of the welded joint -30℃temperature are analyzed.The microstructure of the welded joint is observed under the optical microscope and electron microscope.The result shows that the impact value of the welded joint is better at the condition of medium or small heat input and at80～200℃interpass temperature,and the impact value decreases greatly when heat input exceeds40kJ/cm.

关 键 词：焊接线能量 层间温度 冲击韧性 

分 类 号：TG457.11[金属学及工艺—焊接]