铜陵长江大桥整体拼装低温焊接技术

发布时间：2018-09-08 12:01

【摘要】：铜陵长江大桥主桥为五跨连续三索面钢桁梁斜拉桥,上层公路桥面系采用正交异性钢桥面板,下层铁路桥面系采用正交异性钢箱桥面,钢桁梁的桁片采用大型整体焊接式结构。为保证整体拼装低温焊接质量,针对桥面系板单元和桁片部位的整体拼装对接焊缝进行低温焊接试验,并对试件进行无损检测和力学性能检测。结果表明,在采取低温防护措施后,试件无冷裂纹等缺陷产生,接头的各项力学性能均满足技术条件要求,焊接过程中未产生淬硬组织。在实际生产中,采用减少焊缝中的扩散氢含量、减缓焊缝冷却速度、加强人员及设备防护等措施后,焊缝质量良好,力学性能均满足设计要求,有效地降低了低温对整体拼装焊接的影响,保证了工程的质量和进度。
[Abstract]:The main bridge of Tongling Yangtze River Bridge is a steel truss girder cable-stayed bridge with five spans and three continuous cables. The upper deck of the bridge is faced with orthotropic steel bridge deck, the lower railway deck system adopts orthotropic steel box deck, and the truss plate of steel truss beam adopts large integral welded structure. In order to ensure the quality of the whole assembly low temperature welding, the low temperature welding test was carried out for the integral assembly butt weld of the bridge deck and truss plate, and the nondestructive testing and mechanical property testing were carried out. The results show that no cold cracks and other defects are found in the specimens after low temperature protection. The mechanical properties of the joints all meet the requirements of the technical conditions and the hardened microstructure is not produced during the welding process. In actual production, the welding seam quality is good and the mechanical properties meet the design requirements by reducing the diffusive hydrogen content in the weld seam, slowing down the cooling rate of the weld seam, strengthening the protection of personnel and equipment, etc. The effect of low temperature on integral assembly welding is reduced effectively, and the quality and progress of the project are ensured.
【作者单位】：中铁山桥集团有限公司;
【分类号】：U445.583

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