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da xing chao hou g20mn5 zhu gang jian yi zhong gang han jie shi gong ji shu
Author(s): 
Pages: 37-43
Year: Issue:  3
Journal: Welding Technology

Keyword:  钢结构铸钢件异种钢焊接焊接热应力裂纹;
Abstract: 以广州东塔桁架层连接处巨型铸钢节点为背景,对建筑钢结构425 mm超厚G20Mn5铸钢与Q345C钢异种焊接技术进行了研究。通过合理地构件分段、焊缝坡口设计、焊接材料选择、工艺参数优化、焊接顺序,以及采用计算机温控电加热技术,进行焊前均匀预热、层间温度控制、焊后保温,较好地实现了消氢处理与焊后残余应力的释放,有效地解决了施工空间受限、焊接热应力影响区过度集中的异种钢焊接难题。经分析发现,该G20Mn5铸钢焊缝接头的综合力学性能与理论值基本吻合,且较好满足设计与使用要求。
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