焊接热输入对高温熔池形态的影响  

Effect of Heat Input on the Shape of Welding Pool with High Temperature

作　　者：童莉葛[1,2] 黎磊[1] 谷京晨 白芳[3] 尹少武[1,2] 王立[1,2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]冶金工业节能减排北京市重点实验室,北京100083 [3]中国石油管道学院,河北廊坊065000

出　　处：《工程热物理学报》2015年第1期120-124,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51206010);国家重点基础研究发展计划(973计划)(No.2012CB720406);中央高校基础科研业务费(FRF-SD-12-013A);国家留学基金委资助

摘　　要：焊接熔池形态对焊接过程和焊接质量有着重要影响,熔池的形状不仅决定了焊缝的形状,而且对焊缝的组织、力学性能和焊接质量均有重要影响。本文使用ANSYS有限元软件,采用"生死单元"技术,对X80管线钢复合型坡口多层焊的焊接过程进行二维模拟,研究各填充焊层受后一焊层热影响后,其高温停留时间和熔深随焊接热输入的影响规律。结果表明,焊层的峰值温度随着热输入的增加而增大,填充焊层焊接热输入从13.25 kJ/cm增加到14.57 kJ/cm,高温停留时间的百分比增量是热输入从12.04 kJ/cm增加到13.25 kJ/cm的一半;而各焊层熔深的增加值不变,均为0.45 mm。The weld pool shape is one of important factors related to the welding process and quality,which not only determines the shape of weld seam,but also has an important influence on microstructure,mechanical properties and quality of weld seam.In order to research the properties of the melting time and depth of fusion at filling bead affected by the next layer under different heat inputs,the two dimensional multi-layer welding process with composite welding groove of X80 pipeline steel used by the birth-and-death elements method of the finite element software ANSYS was build.When the heat input of filling bead increased from 13.25 kJ/cm to 14.57 kJ/cm,the increase percentage of melting time was half of that from 12.04 kJ/cm to 13.25 kJ/cm.Meanwhile the increment of each layer's depth of fusion was constant,which remained as 0.45 mm.

关 键 词：多层焊 焊接熔池 固液相变 熔深 

分 类 号：TG40[金属学及工艺—焊接]