Research on the Performance of Friction Stir Welding and Fusion Welding Joint of High-speed Rail Connection Plate

YU Zhikai; LIANG Chen; MAO Mengying; NIU Xujing

doi:10.7512/j.issn.1001-2303.2022.10.10

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Research on the Performance of Friction Stir Welding and Fusion Welding Joint of High-speed Rail Connection Plate
Vol. 52, Issue 10, Pages: 62-71(2022)
Received：26 September 2022，

Published：20 October 2022
DOI： 10.7512/j.issn.1001-2303.2022.10.10
稿件说明：

移动端阅览

郁志凯，梁晨，毛孟颖，等.动车组连接板搅拌摩擦焊及熔化焊接头性能研究［J］.电焊机，2022，52（10）：62-71. DOI： 10.7512/j.issn.1001-2303.2022.10.10.

YU Zhikai, LIANG Chen, MAO Mengying, et al.Research on the Performance of Friction Stir Welding and FusionWelding Joint of High-speed Rail Connection Plate[J].Electric Welding Machine, 2022, 52(10): 62-71. DOI： 10.7512/j.issn.1001-2303.2022.10.10.

摘要

对分别采用搅拌摩擦焊和熔化焊的连接板焊接接头的金相、拉伸、弯曲、硬度及疲劳性能等方面进行对比研究。两种焊接方式金相均合格；采用搅拌摩擦焊的连接板接头抗拉强度为275.67 MPa，比熔化焊（263.8 MPa）高约4.5%；搅拌摩擦焊接头弯曲性能侧弯180°均合格，熔化焊接头侧弯试件在110°左右时由于存在气孔导致裂纹出现；搅拌摩擦焊接头的硬度分布近似W形，中心层焊核区显微硬度值约为79~104 HV，在-18~-6 mm和6~18 mm范围内出现软化现象，最低硬度为69 HV，熔化焊接头的中心层焊缝区显微硬度值约为92~97 HV，在3~9 mm范围内出现软化现象，最低硬度为71 HV；搅拌摩擦焊接头中值疲劳极限为137 MPa，比熔化焊（117 MPa）高约17%。

Abstract

The metallographic

tensile

bending

hardness and fatigue properties of the high-speed rail connection plate welded joint of friction stir welding and fusion welding were compared and studied.The results show that both welding methods are qualified in metallography;The tensile strength of the joint of friction stir welding is 275.67 MPa and is about 4.5% higher than that of fusion welding

which is 263.8MPa; The bending property of friction stir welding joint is all qualified at 180°

and the crack occurs in the specimen of fusion welding head bending at about 110° due to the existence of pores;The hardness distribution of friction stir welding joint is similar to W shape

the microhardness value of the nugget zone of the central layer is about 79~104 HV

and the softening phenomenon occurs at -18~-6 mm and 6~18 mm

and the lowest hardness is 69 HV;The microhardness value of the weld zone on the central layer of the fusion welding joint is about 92~97 HV

the softening phenomenon occurs at about 3~9 mm

and the lowest hardness is 71 HV;The median fatigue limit of friction stir welding joint is 137 MPa and is about 17% higher than that of fusion welding

which is 117 MPa.

关键词

Keywords

references

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