手工自蔓延焊接热循环测试与分析

焊接过程是一个牵涉到传热传质、金属熔化与凝固的复杂过程,焊接能量分布、焊接熔池中的流体流动及其传热过程对焊接质量有着重要的影响。介绍了焊接热循环试验原理和试验设计,测试了手工自蔓延焊接热循环,并将测试结果与传统焊接热循环相比较,分析认为:在焊缝中心线上的温度循环中,距熔合线位置越远温度越低,在焊缝横截面上的温度循环随着布点距离的增大,温度下降;热循环在800℃以上停留时间过长,导致热影响区成为手工自蔓延焊接接头的薄弱区域,并提出了解决方案。

Test and analysis of manual SHS welding thermal circle

Welding process was an extremely complex course,which included heat transfer,mass transfer,melt and solidification of metal,etc.The energy distribution of welding,fluid flow and heat transfer in the welding pool had great influence on the welding quality.In this paper,the principles of welding thermal cycle testing and experimental design to test is described,test results is compared to traditional welding thermal circle with welding thermal circle,and the mannal SHS welding thermal circle is analyzed.The resulte shows the temperature in the weld center line loop from the fusion line position is much lower than the temperature in the weld cross section with the distribution of temperature cycling distance increasing,the temperature drop.A heat-affected zone of welded joints of the mannal SHS welding is resulted in weak areas for staying thermal cycling above 800 ℃ too long,and methods for improving joints are produced.