压力容器非线性裂纹补焊及熔池受力分析  

Repair welding of nonlinear cracks in pressure vessels and force analysis of molten pool

作　　者：纪东生[1] 周世杰[1] 李云涛[2] 李耀荣[3] 王学兰[3] 郝学敏[3] 

机构地区：[1]天津市特种设备监督检验技术研究院,天津300060 [2]天津理工大学材料科学与工程学院,天津300384 [3]天津宝成机械制造股份有限公司,天津300352

出　　处：《电焊机》2015年第7期70-74,共5页Electric Welding Machine

摘　　要：基于A304不锈钢压力容器非线性焊接裂纹的补焊,利用有限体积法建立非线性移动三维焊接熔池流动数学模型,研究补焊熔池流动,通过非线性修正的双椭球热源模型,表征补焊过程中熔池的非线性移动轨迹和传热。在纯传热、负表面张力、正表面张力三种情况下,分析了非线性裂纹补焊过程中的焊接温度场、熔池流动和形貌,结果表明,压力容器裂纹补焊过程中,表面张力对熔池内流体的流动具有强烈的加速作用是主要的驱动力之一。This study is implemented based on the repair welding process of nonlinear cracks in 304 stainless steel pressure vessels. The finite volume method is used to build a three-dimensional flowing model of molten pool and study tbe fluid flowing in mohen pool. And the double ellipsoid heat source model is modified nonlinearly to express the nonlinear moving track and heat transfer of molten pool in repair welding process. In this study,the welding temperature field,shape and fluid flowing of molten pool are analyzed,when the welding process is respectively under three conditions which are pure heat transt^r,negative and positive surface tension. The result shows that surface tension has forceful accelerated effect on the fluid flowing of molten pool in the repair welding process for nonlinear cracks in pressure vessels. And surface tension is one of the most important driving force.

关 键 词：A304不锈钢 压力容器 双椭球热源非线性修正 熔池 受力 

分 类 号：TG457.5[金属学及工艺—焊接]