Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer
For the dissimilar metal welding needs of TA2 titanium and Q235 steel, preliminary trials were conducted using laser welding methods, and the results showed that the addition of a copper interlayer and the bias of the laser beam toward the Q235 side allowed for an effective connection. The welding t...
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MDPI AG
2023-05-01
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| author | Liang Zhang Qi Wang Xiaolei Guo Pan Chen Yinling Wang Chen Wang Zhanxue Wang Zongling Wang |
| author_facet | Liang Zhang Qi Wang Xiaolei Guo Pan Chen Yinling Wang Chen Wang Zhanxue Wang Zongling Wang |
| author_sort | Liang Zhang |
| collection | DOAJ |
| description | For the dissimilar metal welding needs of TA2 titanium and Q235 steel, preliminary trials were conducted using laser welding methods, and the results showed that the addition of a copper interlayer and the bias of the laser beam toward the Q235 side allowed for an effective connection. The welding temperature field was simulated using the finite element method, and the optimum offset distance of 0.3 mm was obtained. Under the optimized parameters, the joint had good metallurgical bonding. Further SEM analysis showed that the microstructure of the bonding area between the weld bead and Q235 was a typical fusion weld pattern, while that of the bonding area between the weld bead and TA2 was in brazing mode. The microhardness of the cross-section showed complex fluctuations; the microhardness of the weld bead center was higher than that of the base metal due to the formation of a mixture microstructure of copper and dendritic Fe phases. The copper layer not involved in the weld pool mixing had almost the lowest microhardness. The highest microhardness was found at the bonding site of TA2 and the weld bead, mainly due to the formation of an intermetallic layer with a thickness of about 100 μm. Further detailed analysis revealed that the compounds included Ti<sub>2</sub>Cu, TiCu and TiCu<sub>2</sub>, showing a typical peritectic morphology. The tensile strength of the joint was approximately 317.6 MPa, reaching 82.71% of that of the Q235 and 75.44% of the TA2 base metal, respectively. The fracture occurred in the unmixed copper layer. |
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| id | doaj.art-c34295a57aeb46c6a9689b5f9419f34c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T03:32:43Z |
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| spelling | doaj.art-c34295a57aeb46c6a9689b5f9419f34c2023-11-18T02:16:56ZengMDPI AGMaterials1996-19442023-05-011610383810.3390/ma16103838Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper InterlayerLiang Zhang0Qi Wang1Xiaolei Guo2Pan Chen3Yinling Wang4Chen Wang5Zhanxue Wang6Zongling Wang7College of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaCollege of Energy Engineering, Huanghuai University, Zhumadian 463000, ChinaFor the dissimilar metal welding needs of TA2 titanium and Q235 steel, preliminary trials were conducted using laser welding methods, and the results showed that the addition of a copper interlayer and the bias of the laser beam toward the Q235 side allowed for an effective connection. The welding temperature field was simulated using the finite element method, and the optimum offset distance of 0.3 mm was obtained. Under the optimized parameters, the joint had good metallurgical bonding. Further SEM analysis showed that the microstructure of the bonding area between the weld bead and Q235 was a typical fusion weld pattern, while that of the bonding area between the weld bead and TA2 was in brazing mode. The microhardness of the cross-section showed complex fluctuations; the microhardness of the weld bead center was higher than that of the base metal due to the formation of a mixture microstructure of copper and dendritic Fe phases. The copper layer not involved in the weld pool mixing had almost the lowest microhardness. The highest microhardness was found at the bonding site of TA2 and the weld bead, mainly due to the formation of an intermetallic layer with a thickness of about 100 μm. Further detailed analysis revealed that the compounds included Ti<sub>2</sub>Cu, TiCu and TiCu<sub>2</sub>, showing a typical peritectic morphology. The tensile strength of the joint was approximately 317.6 MPa, reaching 82.71% of that of the Q235 and 75.44% of the TA2 base metal, respectively. The fracture occurred in the unmixed copper layer.https://www.mdpi.com/1996-1944/16/10/3838microstructuremechanical propertieslaser welddissimilar metalcopper interlayer |
| spellingShingle | Liang Zhang Qi Wang Xiaolei Guo Pan Chen Yinling Wang Chen Wang Zhanxue Wang Zongling Wang Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer Materials microstructure mechanical properties laser weld dissimilar metal copper interlayer |
| title | Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer |
| title_full | Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer |
| title_fullStr | Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer |
| title_full_unstemmed | Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer |
| title_short | Microstructure and Mechanical Properties of TA2/Q235 Laser Weld Joint with Copper Interlayer |
| title_sort | microstructure and mechanical properties of ta2 q235 laser weld joint with copper interlayer |
| topic | microstructure mechanical properties laser weld dissimilar metal copper interlayer |
| url | https://www.mdpi.com/1996-1944/16/10/3838 |
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