Influence of Weld Toe Repair and Ultrasonic Impact Treatment on the Welded Joints of Marine Steel

HE Liang; HE Zhitao; ZHANG Lei; CHENG Bin; MA Xiaoyang; DING Penglong

doi:10.7512/j.issn.1001-2303.2024.08.13

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Influence of Weld Toe Repair and Ultrasonic Impact Treatment on the Welded Joints of Marine Steel
Vol. 54, Issue 8, Pages: 96-101(2024)
Received：30 May 2024，

Published：25 August 2024
DOI： 10.7512/j.issn.1001-2303.2024.08.13
稿件说明：

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何亮，贺智涛，张蕾，等.焊趾熔修和超声冲击处理对船用钢焊接接头的影响［J］.电焊机，2024，54（8）：96-101. DOI： 10.7512/j.issn.1001-2303.2024.08.13.

HE Liang, HE Zhitao, ZHANG Lei, et al.Influence of Weld Toe Repair and Ultrasonic Impact Treatment on the Welded Joints of Marine Steel[J].Electric Welding Machine, 2024, 54(8): 96-101. DOI： 10.7512/j.issn.1001-2303.2024.08.13.

摘要

针对船用钢焊接接头性能薄弱易发生疲劳断裂的问题，分别采用超声冲击、焊趾熔修和焊趾熔修+超声冲击复合处理等三种方法对船用高强钢焊接接头进行强化，对不同工艺强化后接头的残余应力、应力集中系数和疲劳性能进行了对比试验研究。结果表明：（1）超声冲击处理可有效降低接头残余应力，在表面形成有益的压应力，而焊趾熔修对接头残余应力无改善作用，甚至会使残余应力略增大；（2）三种处理工艺均可降低焊趾处应力集中程度，焊趾熔修处理可显著降低焊趾应力集中系数；（3）三种处理工艺均可改善接头低周疲劳性能，超声冲击处理后接头疲劳寿命提高幅度为58%，焊趾熔修处理后疲劳寿命提高幅度为249%，焊趾熔修+超声冲击复合处理后疲劳寿命提高幅度为460%。焊趾熔修+超声冲击复合处理工艺兼顾了焊趾熔修处理和超声冲击处理的优点，既可显著降低焊趾应力集中程度又可获得有益的残余压应力，可应用于船舶焊接结构关键部位的强化。

Abstract

Aiming at the problem of weak performance and easy fatigue fracture of welded joints of Marine steel

three methods were used to strengthen the welded joint of marine high-strength steel

including ultrasonic impact

weld toe repair and weld toe repair + ultrasonic impact composite treatment. The residual stress

stress concentration factor and fatigue performance of the joint strengthened by different processes were compared and studied. The results show that: (1) ultrasonic impact treatment can effectively reduce the residual stress of the joint and form beneficial compressive stress on the surface

while weld toe repair can not improve the residual stress of the joint

and even slightly increase the residual stress; (2) All three treatment processes can reduce the stress concentration at the weld toe

and the weld toe repair treatment can significantly reduce the stress concentration coefficient; (3) All the three treatment processes can improve the low-cycle fatigue performance of the joint. The fatigue life of the joint is increased by 58% after ultrasonic impact treatment

by 249% after weld toe repair

and by 460% after weld toe repair combined with ultrasonic impact treatment. The compound treatment process of weld toe repair and ultrasonic impact gives consideration to the advantages of weld toe repair and ultrasonic impact treatment

which can not only significantly reduce the stress concentration of weld toe

but also obtain beneficial residual compressive stress

and can be applied to strengthening key parts of ship welded structure.

关键词

Keywords

references

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