Reparability Studies on High-speed Railway Vehicle Corbel Sleep Beam A7N01 Alloy with Hybrid Laser-MIG Source

ZHANG Wan'en; ZHOU Xiru; QIN Qingbin; HAN Xiaohui; WU Shengchuan

doi:10.7512/j.issn.1001-2303.2022.12.07

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Reparability Studies on High-speed Railway Vehicle Corbel Sleep Beam A7N01 Alloy with Hybrid Laser-MIG Source
Vol. 52, Issue 12, Pages: 62-69(2022)
Received：14 March 2022，

Revised：2022-11-10，

Published：20 December 2022
DOI： 10.7512/j.issn.1001-2303.2022.12.07
稿件说明：

移动端阅览

张万恩，周希孺，秦庆斌，等.高速列车枕梁激光-MIG复合焊修复接头的组织和性能研究［J］.电焊机，2022，52（12）：62-69. DOI： 10.7512/j.issn.1001-2303.2022.12.07.

ZHANG Wan'en, ZHOU Xiru, QIN Qingbin, et al.Reparability Studies on High-speed Railway Vehicle Corbel Sleep Beam A7N01 Alloy with Hybrid Laser-MIG Source[J].Electric Welding Machine, 2022, 52(12): 62-69. DOI： 10.7512/j.issn.1001-2303.2022.12.07.

摘要

修复再制造作为现代轨道交通设备健康管理系统的关键技术之一，对提高车辆运行的可靠性和经济性具有重要意义。经验表明，补焊是在高速列车等大型焊接构件上应用最普遍、适用性最强的修复方案。采用激光-MIG复合热源方式对高速列车用A7N01铝合金的焊缝缺陷进行焊接修复，通过焊缝无损验收标准对其进行表面检查和内部探伤等无损检测，通过力学性能及疲劳性能试验对该补修方案进行更深入的完整性评价。结果表明，与原始接头相比，修复后的焊缝表面成形美观，达到验收1级标准；接头硬度明显降低，屈服强度和抗拉强度均有所下降，但是弹性模量和伸长率分别提升了10.4%和153.6%，疲劳强度提升了33.8%。本研究为高速列车损伤结构的补修问题提供了理论和数据支持。

Abstract

As one of the key technologies of modern rail transit equipment health management system

repair and remanufacturing is of great significance to improve the reliability and economy of high-speed vehicle operation. Welding repair is the most common and most applicable repair scheme for large welded components in high-speed trains. In this study

the weld defects of A7N01 aluminum alloy commonly used in high-speed trains were repaired by hybrid laser-MIG welding

and the weld was nondestructive tested through the relevant weld nondestructive acceptance standard. In addition

more in-depth integrity evaluation of the repair scheme was carried out through mechanical property and fatigue property tests. The results show that the weld was changed from the original unqualified to the acceptance level 1 standard through repairing. The hardness together with yield and ultimate strength of the joints after repair was significantly reduced

but the young modulus and elongation are increased by 10.4% and 153.6%

respectively

and the fatigue strength was increased by 33.8%

which provides theoretical and data support for the repair of damaged structures of high-speed railway trains.

关键词

Keywords

references

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