摘要
分析比较了三种基于点热源的熔化极气体保护焊(GMAW)热输入分布模式,并结合移动点热源作用下焊接温度场的瞬态解分别对其进行了计算,通过焊缝横截面熔合线几何形状计算值与实测值的比较,对三种热输入分布模式进行了评估。利用所建串热源模型模拟了Q195低碳钢和JG590低合金钢GMAW焊缝横截面熔合线的几何形状,进行了Q195钢和JG590钢的GMAW工艺试验,通过焊缝横截面熔合线的几何形状对所建模型进行了试验验证。采用计算和试验相结合的方法,分析评价了目前常用的t8/5计算公式,利用JG590钢焊接温度场的计算结果,结合JG590钢的焊接连续冷却组织转变图,成功地预测了焊接接头熔合区的组织及硬度。
Calculations were made for the transient solution of welding thermal process with a point heat source moving on the workpiece with three different energy distribution models based on point heat sources for gas metal arc welding (GMAW) process. These three distribution models of energy input for GMAW process were evaluated by the comparison between the predicted weld junction and the measured results. Moreover, weld junction of the weldments from low carbon steel Q195 and low alloy steel JG590 via GMAW technique were predicted using the developed string heat source model. Experiments for both Q195 steel and JG590 steel were conducted. The predicted weld cross sections had a good agreement with the experimental measurements. Current equations for t8/5 calculation were evaluated. Based on the calculated results from GMAW thermal process, microstructure and hardness of JG590 steel fusion zone were successfully predicted with the continuous cooling transformation diagram.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第5期27-30,34,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50375038)
山东省中青年科学家科研奖励基金资助项目(03bs105)
