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自升式平台的桩腿由多段大厚度高强钢圆筒拼接而成,所需的大量的多层多道焊工艺,以及导致复杂的焊接变形与残余应力,是桩腿加工精度和安全性检验中需格外关注的问题。焊接变形、应力与焊接工艺参数和工艺措施有关,因此文章选取了4项对焊接变形及应力有重要影响的工艺参数,即预热温度、保温缓冷措施、焊接速度和约束条件,通过热弹塑性有限元计算,分析这4项工艺参数对圆筒圆度和应力极值的影响,并基于对焊接变形与应力的综合控制,提出了工艺优化建议。
The legs of the self-elevating platform are spliced together by a plurality of sections of large-thickness and high-strength steel cylinders. The large number of multi-layer and multi-pass welding processes required, as well as complicated welding deformation and residual stress, are used to test the machining accuracy and safety of the legs In the need to pay special attention to the problem. Welding deformation and stress are related to welding process parameters and process measures. Therefore, the article selects four process parameters that have an important influence on the welding deformation and stress, that is, the preheating temperature, the slow cooling mode, the welding speed and the restraining conditions, Plastic finite element method, the influence of these four process parameters on the roundness and stress extremum of the cylinder was analyzed. Based on the comprehensive control of the welding deformation and stress, the process optimization suggestion was put forward.