高强钢焊接接头优化方法研究现状

Research status of optimization methods for high strength steel welded joints

高强钢以出色的力学性能在焊接结构的应用量急剧增加,其焊接接头性能已逐步成为研究焦点。为了解决高强钢焊接易出现冷裂纹、热影响区软化脆化、低温冲击韧度不高等问题,获得高强钢焊接接头优良强韧匹配。在使用熔化极气体保护焊接工艺的基础上采用不同的高强钢焊接接头优化方法,对严格控制热输入、焊前预热并控制热输入和研发并采用药芯焊丝这3种焊接接头优化方法进行分析总结,对3种优化方法下的焊接接头微观组织及力学性能进行分析,发现通过这3种接头优化方法可避免焊接接头产生裂纹、获得良好的韧性组织和力学性能优良的焊接接头。

The application of high strength steel in welded structures with excellent mechanical properties has increased rapidly,and its welded joint properties have gradually become the focus of research.In order to solve the problems of cold crack,softening embrittlement in heat affected zone and low impact toughness of high strength steel welding,obtain excellent strength and toughness matching of high strength steel welding joints.On the basis of using gas metal arc welding,different optimization methods of high-strength steel welding joints were adopted to analyze and summarize the three optimization methods of welding joints:strict control of heat input,pre-welding preheating and control of heat input,and research and development and use of flux-cored wire.The microstructure and mechanical properties of welded joints under the three optimization schemes were analyzed.It is found that the three joint optimization methods can avoid cracks in welded joints,obtain good toughness structure and excellent mechanical properties of welded joints.