摘要
焊接结构中较大的焊接残余应力的存在往往导致焊接结构性能恶化。而一般来说,钢的屈服强度越高则往往导致其焊接结构中的焊接残余拉应力越大。本文针对屈服强度近800MPa的高强钢10Ni5CrMoV钢平板堆焊试样的焊接残余应力进行了研究。结果表明,焊接各区域并未出现较大值的焊接残余拉应力,甚至出现压应力。分析其原因,是焊缝与母材的线膨胀系数匹配、焊缝材料在焊接冷却过程中的低温相变所致。
The existence of the welding residual stress always resultes in the deteriorative property of whole welding structure. Absolutely, the higher the yield strength of steels, the higher the residual stress in the welding structure. The welding residual stress of high strength steel 10Ni5CrMoV with a yield strength nearly 800 MPa was studied using plate surfacing samples. The results show that no high residual tensile stress occurs in welding zones, even compressive stress occurs. The reasons are the match of linear expansion coefficient of the weld and base metal and the low-temperature phase transition of the weld metal during welding cooling by analyzing the special phenomenon of residual stress.
出处
《热加工工艺》
CSCD
北大核心
2008年第21期33-36,共4页
Hot Working Technology
关键词
焊接残余应力
线膨胀系数匹配
低温相变
welding residual stress
match of linear expansion coefficient
low temperature phase transition
