The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process
Thick-walled X80 pipelines for oil and gas transportation are difficult to relocate due to their large size. In the process of narrow-gap overhead welding, welding defects, such as bulges and lack of sidewall fusion, can appear easily. To avoid these defects and to improve the welding quality of thi...
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MDPI AG
2023-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/9/5519 |
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| author | Yang Bao Ruilei Xue Jianping Zhou Hongsheng Liu Yan Xu |
| author_facet | Yang Bao Ruilei Xue Jianping Zhou Hongsheng Liu Yan Xu |
| author_sort | Yang Bao |
| collection | DOAJ |
| description | Thick-walled X80 pipelines for oil and gas transportation are difficult to relocate due to their large size. In the process of narrow-gap overhead welding, welding defects, such as bulges and lack of sidewall fusion, can appear easily. To avoid these defects and to improve the welding quality of thick-walled pipelines, the GMAW welding method is adopted in this paper. The formation characteristics of the weld and the influence of arc oscillation parameters, such as the oscillation width and sidewall dwell time, on the formation process of narrow-gap overhead welding seams are studied. In this research, it was found that, in the NG-GMAW overhead welding position, there was a downward trend in the middle of the formed surface of the weld pool. Defects, such as finger-shaped penetrations and lack of sidewall fusion, were prone to occur due to gravity. The increased oscillation width was beneficial for reducing the protrusion in the middle of the weld seam, but an excessive oscillation width can easily cause undercut defects. The sidewall dwell time has little effect on the protrusion in the middle of the weld seam, but it can increase sidewall penetration, thereby avoiding the occurrence of incomplete sidewall penetration. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T04:24:13Z |
| publishDate | 2023-04-01 |
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| spelling | doaj.art-60c1b5e72a1f4b0192c3d6f184553a0c2023-11-17T22:35:08ZengMDPI AGApplied Sciences2076-34172023-04-01139551910.3390/app13095519The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW ProcessYang Bao0Ruilei Xue1Jianping Zhou2Hongsheng Liu3Yan Xu4School of Mechanical Engineering, Xinjiang University, Urumqi 830049, ChinaSchool of Mechanical Engineering, Xinjiang University, Urumqi 830049, ChinaSchool of Mechanical Engineering, Xinjiang University, Urumqi 830049, ChinaSchool of Mechanical Engineering, Xinjiang University, Urumqi 830049, ChinaSchool of Mechanical Engineering, Xinjiang University, Urumqi 830049, ChinaThick-walled X80 pipelines for oil and gas transportation are difficult to relocate due to their large size. In the process of narrow-gap overhead welding, welding defects, such as bulges and lack of sidewall fusion, can appear easily. To avoid these defects and to improve the welding quality of thick-walled pipelines, the GMAW welding method is adopted in this paper. The formation characteristics of the weld and the influence of arc oscillation parameters, such as the oscillation width and sidewall dwell time, on the formation process of narrow-gap overhead welding seams are studied. In this research, it was found that, in the NG-GMAW overhead welding position, there was a downward trend in the middle of the formed surface of the weld pool. Defects, such as finger-shaped penetrations and lack of sidewall fusion, were prone to occur due to gravity. The increased oscillation width was beneficial for reducing the protrusion in the middle of the weld seam, but an excessive oscillation width can easily cause undercut defects. The sidewall dwell time has little effect on the protrusion in the middle of the weld seam, but it can increase sidewall penetration, thereby avoiding the occurrence of incomplete sidewall penetration.https://www.mdpi.com/2076-3417/13/9/5519oscillation arcNG-GMAWoverhead weldingweld bead formation |
| spellingShingle | Yang Bao Ruilei Xue Jianping Zhou Hongsheng Liu Yan Xu The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process Applied Sciences oscillation arc NG-GMAW overhead welding weld bead formation |
| title | The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process |
| title_full | The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process |
| title_fullStr | The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process |
| title_full_unstemmed | The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process |
| title_short | The Influence of Oscillation Parameters on the Formation of Overhead Welding Seams in the Narrow-Gap GMAW Process |
| title_sort | influence of oscillation parameters on the formation of overhead welding seams in the narrow gap gmaw process |
| topic | oscillation arc NG-GMAW overhead welding weld bead formation |
| url | https://www.mdpi.com/2076-3417/13/9/5519 |
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