Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding
In this work, a new welding method, AC-DC hybrid TIG welding, is used to weld 304 stainless steel. Research on the formation, microstructure, and properties of 304 stainless-steel welded joints are studied by using optical microscope and microhardness. The results show that the weld with AC/DC hybri...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/6/1127 |
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| author | Ying Ye Bairu Yang Yonghui Yang Zihan Pan Chao Chen Xinlong Zhang |
| author_facet | Ying Ye Bairu Yang Yonghui Yang Zihan Pan Chao Chen Xinlong Zhang |
| author_sort | Ying Ye |
| collection | DOAJ |
| description | In this work, a new welding method, AC-DC hybrid TIG welding, is used to weld 304 stainless steel. Research on the formation, microstructure, and properties of 304 stainless-steel welded joints are studied by using optical microscope and microhardness. The results show that the weld with AC/DC hybrid welding is a fish-scale pattern, and the density of the fish-scale pattern increases with the increase of AC proportion. Both the weld penetration and the ratio of weld penetration to weld width are the highest when AC accounts for 30%. At this point, the weld penetration is 0.83 mm larger than DC mode, an increase of 93.26%, and the ratio of weld penetration to weld width is 1.6, which is 76.19% higher than DC mode. When the proportion of AC is increased, the microstructure of the weld is equiaxed or columnar, and the microstructure of the heat-affected zone is ferrite in the form of lath. The hardness of the weld is greater than that of the base metal, and the hardness of the heat-affected zone is the lowest. The microhardness distribution of the weld with AC 50% is the most uniform. When AC accounts for 20% and 30%, the average weld hardness is the highest, which are 196.7 HV and 198.1 HV, respectively. |
| first_indexed | 2024-03-11T02:08:55Z |
| format | Article |
| id | doaj.art-0f7c54d96f684e6ca6fd3d5f470842c0 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-11T02:08:55Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-0f7c54d96f684e6ca6fd3d5f470842c02023-11-18T11:37:11ZengMDPI AGMetals2075-47012023-06-01136112710.3390/met13061127Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG WeldingYing Ye0Bairu Yang1Yonghui Yang2Zihan Pan3Chao Chen4Xinlong Zhang5College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, ChinaIn this work, a new welding method, AC-DC hybrid TIG welding, is used to weld 304 stainless steel. Research on the formation, microstructure, and properties of 304 stainless-steel welded joints are studied by using optical microscope and microhardness. The results show that the weld with AC/DC hybrid welding is a fish-scale pattern, and the density of the fish-scale pattern increases with the increase of AC proportion. Both the weld penetration and the ratio of weld penetration to weld width are the highest when AC accounts for 30%. At this point, the weld penetration is 0.83 mm larger than DC mode, an increase of 93.26%, and the ratio of weld penetration to weld width is 1.6, which is 76.19% higher than DC mode. When the proportion of AC is increased, the microstructure of the weld is equiaxed or columnar, and the microstructure of the heat-affected zone is ferrite in the form of lath. The hardness of the weld is greater than that of the base metal, and the hardness of the heat-affected zone is the lowest. The microhardness distribution of the weld with AC 50% is the most uniform. When AC accounts for 20% and 30%, the average weld hardness is the highest, which are 196.7 HV and 198.1 HV, respectively.https://www.mdpi.com/2075-4701/13/6/1127TIG weldingAC-DC hybridformingmicrostructure |
| spellingShingle | Ying Ye Bairu Yang Yonghui Yang Zihan Pan Chao Chen Xinlong Zhang Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding Metals TIG welding AC-DC hybrid forming microstructure |
| title | Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding |
| title_full | Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding |
| title_fullStr | Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding |
| title_full_unstemmed | Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding |
| title_short | Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding |
| title_sort | research on the formation microstructure and properties of 304 stainless steel ac dc hybrid tig welding |
| topic | TIG welding AC-DC hybrid forming microstructure |
| url | https://www.mdpi.com/2075-4701/13/6/1127 |
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