钢结构厂房横梁开裂分析与修复

The crack analysis and repair method of cross beams in steel constructed factory buildings

针对钢结构厂房横梁翼板与端板之间热影响区开裂,用光学显微镜观察母材、焊缝、热影响区显微组织,用直读光谱仪对钢板、焊丝、焊缝的成分进行了分析。证明了横梁开裂是因为翼板中存在带状组织和夹杂物,由于焊接线能量过大导致焊接热影响区出现魏氏组织和翼板中的夹杂物进入焊缝,在焊接应力的作用下产生了开裂。并通过改进工艺和结构解决了开裂问题。

In order to investigate the cause of cracking, which occurs in the heating influence zone between the end plate and flange of crossbeam during welding of steel structure plant building, the microstructure of substrate, weld seam and heating influence zone were examined using optical microscope and the composition of substrate, welding stick and weld seam were analyzed using direct-reading spectrograph. The results show that there existed strip structure and impurities in the heating influence zone, resulting in cracking in the zone occurred under welding stress due to excessive welding linear energy. With improving welding structure and technique, the cracking phenomenon is overcome.