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某重载铁路线路采用铝热焊技术实现钢轨现场焊接,为分析评价铝热焊接头的力学性能,对现场取样的焊接钢轨进行一系列室内力学试验,试验结果表明:部分试样轨头受压静弯试验不满足荷载力要求,所有试样最大挠度均低于规范限值;部分试样疲劳加载次数未达到200万次要求的;所有试样的冲击吸收功远低于规范要求。该重载铁路75 kg·m-1钢轨铝热焊接头的力学性能不满足规范要求,需要对焊剂、焊接设备以及焊接工艺进行改进,以满足重载铁路高强度钢轨对铝热焊接头力学性能的要求。
In order to analyze and evaluate the mechanical properties of the aluminum welded joints, a series of laboratory mechanical tests on the welded rails sampled on site were carried out. The test results show that some of the rail samples are under pressure Static bending test does not meet the requirements of load capacity, the maximum deflection of all samples are below the specification limits; part of the sample fatigue loading times did not meet the requirements of 2 million times; all specimens of the impact absorption far below the specification requirements. The mechanical properties of the 75 kg · m-1 rail aluminum welded joints of the heavy haul railway do not meet the specifications, and the flux, welding equipment and welding technology need to be improved to meet the mechanical properties of the heavy haul rail high-strength rail to the aluminum welded joints Request.