补焊工艺对30CrMnSiA接头微观组织及性能的影响研究

doi:10.11896/cldb.22020034

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Abstract Repair welding experiment was carried out for cracks that produced in the service process around 30CrMnSiA welding parts, which purpose of this was to reduce the enterprises' cost and avoid the waste of resources caused by the direct replacement of large structural parts in the maintenance process. The dependence relationship was established by comparison analysis with before and after repair welding around microstructure and properties that were characterized and analyzed with metallography, scanning electron microscopy(SEM), electron backscatter diffraction(EBSD), tensile, and impact and bending tests, which provided some theoretical support for the optimization of repair welding process around structural steel. Among them, HTJ-3 and HTG-1 electrodes were used to filling material during the test. The results showed that the martensitic and ferrite was found in the bottom welding layer before and after repair welding. And the coarse columnar crystals were formed along the direction perpendicular to the fusion line in the repair welding zone, which resulted from HTG-1 electrodes as the filler metal in repair welding process. In addition, the original welding zone of the joints before and after repair welding was dominated by high angle grain boundary, which can enhance the hindrance ability of metal in this area to crack propagation. Moreover, the tensile strength and plasticity indicator of the welded joints have been significantly declined after repairing welding, but the impact toughness has been improved.

Key words： 30CrMnSiA welded joint repair welding microstructure mechanical property

Published: 25 August 2023 Online: 2023-08-14

CLC number:

TG456.7

Fund:National Natural Science Foundation of China (51974243), the Shaanxi Province Natural Science Basic Research Project (2019JZ-31), and the Natural Science Special Project of Shaanxi Provincial Department of Education (19JK0590).

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	Articles by authors
	ZHANG Bingxian
	DU Mingke
	LEI Longyu
	ZHANG Min
	ZHANG Zhiqiang

Cite this article:

ZHANG Bingxian,DU Mingke,LEI Longyu, et al. Research on the Influence of Repair Welding Process on Microstructure and Properties Around 30CrMnSiA Welded Joint[J]. Materials Reports, 2023, 37(16): 22020034-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22020034 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22020034

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