Microstructure and Properties of Middle Trough Components for Swing Arc GMAW Narrow Gap Welding

DONG Manshu; SUN Qingjie; LIU Jinde; PENG Chuntao; CHEN Bing

doi:10.7512/j.issn.1001-2303.2024.03.09

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Microstructure and Properties of Middle Trough Components for Swing Arc GMAW Narrow Gap Welding
Vol. 54, Issue 3, Pages: 54-59(2024)
Published： 25 March 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.03.09

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董曼淑，孙清洁，刘进德，等.中部槽构件摆动电弧窄间隙GMAW焊接接头组织及性能研究［J］.电焊机，2024，54（3）：54-59.

DONG Manshu, SUN Qingjie, LIU Jinde, et al.Microstructure and Properties of Middle Trough Components for Swing Arc GMAW Narrow Gap Welding[J].Electric Welding Machine, 2024, 54(3): 54-59.
董曼淑，孙清洁，刘进德，等.中部槽构件摆动电弧窄间隙GMAW焊接接头组织及性能研究［J］.电焊机，2024，54（3）：54-59. DOI： 10.7512/j.issn.1001-2303.2024.03.09.

DONG Manshu, SUN Qingjie, LIU Jinde, et al.Microstructure and Properties of Middle Trough Components for Swing Arc GMAW Narrow Gap Welding[J].Electric Welding Machine, 2024, 54(3): 54-59. DOI： 10.7512/j.issn.1001-2303.2024.03.09.

摘要

采用摆动电弧窄间隙GMAW对中部槽所用50 mm厚ZG/NM异种钢组合进行了非对称填充式双面焊接。焊后在垂直于焊缝方向切取金相试样进行微观组织观察，同时取样进行力学性能测试，包括硬度测试和拉伸试验。试验结果表明：摆动电弧GMAW有效抑制了侧壁未熔合缺陷，未出现裂纹；不同填充层由于焊接规范差异，导致组织有所不同；所表征各填充层拉伸性能表现良好，与填充金属性能相当，其中深U型一侧底层强度最高，单道V型填充层强度介于U型顶部与底部之间；接头填充金属的硬度随位置发生变化，从U型一侧到V型一侧，硬度值逐渐降低。不同填充层，母材硬度值最高，填充金属硬度值最低，接头强度与硬度的差异主要归因于焊缝金属中铁素体的含量与形态。

Abstract

Asymmetrically filled double-sided welding of 50 mm ZG/NM dissimilar steel composite used in the middle trough was carried out by oscillating arc narrow-gap GMAW. With the help of swing arc

the weld is well formed and the incomplete defect of side wall is well controlled. The microstructure and properties of joints at different positions along the plate thickness direction were studied. The results show that there are some differences in the microstructure of different layers due to different welding specifications. The tensile properties of the different filling layers are good and comparable to those of the filling metal. The bottom layer at the side of the deep U groove has the highest strength

and the strength of the single V-shaped layer is between the top and the bottom of the U-shaped filler metal. The hardness of the filler metal changes with the location

from the single U-side to the V-side

the hardness value decreases gradually. The hardness value of base metal is the highest and the hardness value of filling metal is the lowest in different filling layers.

关键词

中部槽异种钢焊接窄间隙坡口摆动电弧热输入铁素体

Keywords

middle troughdissimilar steelnarrow clearance grooveswing archeat inputferrite

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