轮式起重机的钢结构普遍应用焊接结构。研究焊接产生的残余应力对结构强度的影响,已成为一个重要的课题,特别对于重量轻而强度要求较高的结构(如起重臂等)更为突出。在焊接过程中,由于急剧加热和冷却,使得焊缝附近温度分布很不均匀。焊缝处温度高,而周围金属温度较低,至使高温部分金属 The steel structure of wheeled cranes is commonly used in welded construction. Studying the influence of residual stress caused by welding on the structural strength has become an important issue, especially for lightweight and strength-demanding structures such as jibs. During the welding process, due to the rapid heating and cooling, the temperature distribution near the weld is very uneven. Welds at high temperatures, while the surrounding metal temperature is low, so that the high temperature part of the metal