摘要
K-PAW焊接时形成具有"倒喇叭"状的焊缝.根据K-PAW的焊缝形状特点,通过比较多种热源作用模式,得到了适合于K-PAW焊接的组合式体积热源作用模式,即,沿板厚方向,工件的上部采用双椭球体热源,下部为中心轴热流峰值线性递增的圆柱体热源.将"双椭球体+峰值递增圆柱体"组合式热源应用于SYSWELD软件与K-PAW焊接热过程的有限元分析模型,计算了6 mm厚不锈钢板K-PAW焊接温度场以及焊缝形状尺寸,计算与试验结果吻合良好,结果表明了所用热源模式的适用性.
Considering the weld geometric characters of keyhole plasma arc welding(K-PAW),a suitable and adaptive combined heat source for numerical simulation is developed,i.e.at the transverse cross-section and along the workpiece thickness direction,the double-ellipsoidal volumetric heat source acts at upper part of the workpiece while a linearly-increased peak value of heat flux in gaussian cylinder mode exerts at lower part of the workpiece.Based on the developed adaptive combined heat source model,the welding temperature field of 6 mm thickness stainless steel is simulated by SYSWELD.The predicted weld geometry and fusion line locus at cross-section are in good agreement with the experimental measurement.This demonstrates the suitability of the combined volumetric heat source mode.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第12期66-69,116,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51005106)
江苏科技大学博士启动基金资助项目(35060902)
江苏高校优势学科建设工程资助项目
关键词
穿孔型等离子弧焊接
温度场
组合式热源
有限元分析
keyhole plasma arc welding
temperature field
combined volumetric heat source
finite element analysis
