Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding
The Q235 steel plate butt joint was successfully welded by the laser K-TIG hybrid welding method. The effects of hybrid welding process parameters such as welding current, the distance between heat sources, laser power, laser defocusing amount, and welding speed on the coupled arc profile and weldin...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/7/1139 |
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| author | Hongchang Zhang Jiang Yu Zixiao Zhang Jianguo Gao Zhaofang Su Zhaorong Sun Yinan Li |
| author_facet | Hongchang Zhang Jiang Yu Zixiao Zhang Jianguo Gao Zhaofang Su Zhaorong Sun Yinan Li |
| author_sort | Hongchang Zhang |
| collection | DOAJ |
| description | The Q235 steel plate butt joint was successfully welded by the laser K-TIG hybrid welding method. The effects of hybrid welding process parameters such as welding current, the distance between heat sources, laser power, laser defocusing amount, and welding speed on the coupled arc profile and welding process stability were studied. The results indicated that the laser deflects the K-TIG arc, and the deflection angle becomes smaller as the arc current increases. After K-TIG generates small holes, if the laser beam acts on the bottom of the keyhole, the welded depth can be further increased; however, the laser power has little effect on the welded depth. The distance between heat sources is the main factor affecting the state of laser-arc coupling. Optical microstructures of welded joints showed that the grains in the arc zone were coarser than those in the laser zone, and there are more columnar crystals in the fusion zone. The microhardness of the weld center is significantly higher than that of the base metal, up to 220 HV. At the same time, the change of tensile strength of the weld under the influence of a single parameter was analyzed, and it was found that tensile properties of the weld first increased and then decreased with the increase of K-TIG arc current <i>I</i>, heat source distance <i>D,</i> and welding speed <i>V</i>, respectively. With the increase of laser power <i>P</i>, it first decreased and then increased, and with the increase of laser defocusing amount <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">δ</mi></semantics></math></inline-formula><i>f</i>, it showed a downward trend. |
| first_indexed | 2024-03-09T10:15:45Z |
| format | Article |
| id | doaj.art-c7348e83b4db4ad19f8ef8a8661a2b73 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T10:15:45Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-c7348e83b4db4ad19f8ef8a8661a2b732023-12-01T22:26:20ZengMDPI AGMetals2075-47012022-07-01127113910.3390/met12071139Arc Characteristics and Welding Process of Laser K-TIG Hybrid WeldingHongchang Zhang0Jiang Yu1Zixiao Zhang2Jianguo Gao3Zhaofang Su4Zhaorong Sun5Yinan Li6School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, ChinaShandong Classic Group Co., Ltd., Jining 272000, ChinaShandong Classic Group Co., Ltd., Jining 272000, ChinaShandong Jinrunde New Material Technology Co., Ltd., Zibo 255000, ChinaSchool of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaThe Q235 steel plate butt joint was successfully welded by the laser K-TIG hybrid welding method. The effects of hybrid welding process parameters such as welding current, the distance between heat sources, laser power, laser defocusing amount, and welding speed on the coupled arc profile and welding process stability were studied. The results indicated that the laser deflects the K-TIG arc, and the deflection angle becomes smaller as the arc current increases. After K-TIG generates small holes, if the laser beam acts on the bottom of the keyhole, the welded depth can be further increased; however, the laser power has little effect on the welded depth. The distance between heat sources is the main factor affecting the state of laser-arc coupling. Optical microstructures of welded joints showed that the grains in the arc zone were coarser than those in the laser zone, and there are more columnar crystals in the fusion zone. The microhardness of the weld center is significantly higher than that of the base metal, up to 220 HV. At the same time, the change of tensile strength of the weld under the influence of a single parameter was analyzed, and it was found that tensile properties of the weld first increased and then decreased with the increase of K-TIG arc current <i>I</i>, heat source distance <i>D,</i> and welding speed <i>V</i>, respectively. With the increase of laser power <i>P</i>, it first decreased and then increased, and with the increase of laser defocusing amount <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">δ</mi></semantics></math></inline-formula><i>f</i>, it showed a downward trend.https://www.mdpi.com/2075-4701/12/7/1139laser K-TIG hybrid weldingcoupling arc profileprocess parametersmicrostructure analysistensile strength |
| spellingShingle | Hongchang Zhang Jiang Yu Zixiao Zhang Jianguo Gao Zhaofang Su Zhaorong Sun Yinan Li Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding Metals laser K-TIG hybrid welding coupling arc profile process parameters microstructure analysis tensile strength |
| title | Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding |
| title_full | Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding |
| title_fullStr | Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding |
| title_full_unstemmed | Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding |
| title_short | Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding |
| title_sort | arc characteristics and welding process of laser k tig hybrid welding |
| topic | laser K-TIG hybrid welding coupling arc profile process parameters microstructure analysis tensile strength |
| url | https://www.mdpi.com/2075-4701/12/7/1139 |
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