焊接顺序对Cr13型抗磨板表面堆焊变形的影响

基于热弹塑性有限元法，在仅考虑单向耦合的基础上，建立了抗磨板表面堆焊情况下的有限元计算模型，并对三种不同焊接顺序下的温度场、应力应变场进行了数值模拟，分析了焊接顺序对抗磨板表面堆焊变形的影响规律.结果表明，不同焊接顺序下导叶轴孔圆周度变形程度不同，与水平面间隙大小不一，焊后最大残余应力位于螺栓孔处，且最大残余应力沿螺栓孔周向呈正弦分布.综合比较，焊接顺序3引起的焊接变形小，且焊后残余应力分布均衡，有利于提高抗磨板的可靠性和安全性.模拟结果为Cr13型抗磨板实际焊接修复时的焊接顺序选择提供了理论依据.

Influence of welding sequence of surfacing welding on deformation of Cr13 facing plate

Based on the thermo elastic plastic finite element method, the calculation model of stress-strain field in surface of facing plate was established. Only model unilateral coupling was considered. And the stress-strain fields of facing plate in different welding sequences were calculated. The effect of welding sequence on deformation and residual stress of facing plate was analyzed. The results show that the different sequences result in deformation of guide vane bearing hole with different degree. The gaps between facing plate and horizontal plane around guide vane bearing hole are also varying. The highest residual stress locates in the margin of bolt hole, and the unidirectional stress takes on a sine distribution along the circle of the bolt hole in different sequences. Through comprehensive compare, it is found that welding sequence 3, in which the smaller deformation and the more balanced distribution of residual stress are generated, is beneficial to improve the reliability and safety of facing plate.