Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing
A large number of MIG welding tests were carried out on a 3 mm thick 7075 aluminum alloy plate prepared by the self-developed jet forming–extrusion–drawing process of 7075 high-strength aluminum alloy welding wire, and the welding process of the welding wire and the change in the performance of the...
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2024-12-01
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| author | Chunkai Zhou Xiaoping Li Gao Hua |
| author_facet | Chunkai Zhou Xiaoping Li Gao Hua |
| author_sort | Chunkai Zhou |
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| description | A large number of MIG welding tests were carried out on a 3 mm thick 7075 aluminum alloy plate prepared by the self-developed jet forming–extrusion–drawing process of 7075 high-strength aluminum alloy welding wire, and the welding process of the welding wire and the change in the performance of the welded joint after T6 heat treatment were studied. The results show that the self-developed wire has a good forming joint and a wide welding process window: the welding speed is 5–7 mm/s, and the welding current is 100–150 A. The main precipitated phases in the joint were η(MgZn<sub>2</sub>), S(CuMgAl<sub>2</sub>), Mg<sub>2</sub>Si, and Al<sub>13</sub>Fe<sub>4</sub>, which were continuously distributed at the grain boundaries in the form of coarse networks or long strips, which was an important reason for the weak performance of the joints. After the heat treatment of T6, the precipitated phase in the joint was greatly reduced, the element segregation phenomenon was improved, and the residual precipitated phase was mainly Al<sub>13</sub>Fe<sub>4</sub> and a small amount of insoluble phase Fe and Si, and the recrystallization size of the heat-affected zone was refined. Through heat treatment, the average microhardness of the joint was increased from 110 HV to 150.24 HV, and the tensile strength was increased from 326 MPa to 536 MPa, reaching 97.5% of the strength of the base metal, indicating that the softening phenomenon was significantly improved after heat treatment, and the joint had excellent performance. |
| format | Article |
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| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-82a59f59116e480d9ea5083d0cb4927a2025-08-20T02:56:50ZengMDPI AGMetals2075-47012024-12-011412144310.3390/met14121443Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–DrawingChunkai Zhou0Xiaoping Li1Gao Hua2Department of Materials Engineering, Jiangsu University of Technology, Changzhou 213000, ChinaDepartment of Materials Engineering, Jiangsu University of Technology, Changzhou 213000, ChinaDepartment of Materials Engineering, Jiangsu University of Technology, Changzhou 213000, ChinaA large number of MIG welding tests were carried out on a 3 mm thick 7075 aluminum alloy plate prepared by the self-developed jet forming–extrusion–drawing process of 7075 high-strength aluminum alloy welding wire, and the welding process of the welding wire and the change in the performance of the welded joint after T6 heat treatment were studied. The results show that the self-developed wire has a good forming joint and a wide welding process window: the welding speed is 5–7 mm/s, and the welding current is 100–150 A. The main precipitated phases in the joint were η(MgZn<sub>2</sub>), S(CuMgAl<sub>2</sub>), Mg<sub>2</sub>Si, and Al<sub>13</sub>Fe<sub>4</sub>, which were continuously distributed at the grain boundaries in the form of coarse networks or long strips, which was an important reason for the weak performance of the joints. After the heat treatment of T6, the precipitated phase in the joint was greatly reduced, the element segregation phenomenon was improved, and the residual precipitated phase was mainly Al<sub>13</sub>Fe<sub>4</sub> and a small amount of insoluble phase Fe and Si, and the recrystallization size of the heat-affected zone was refined. Through heat treatment, the average microhardness of the joint was increased from 110 HV to 150.24 HV, and the tensile strength was increased from 326 MPa to 536 MPa, reaching 97.5% of the strength of the base metal, indicating that the softening phenomenon was significantly improved after heat treatment, and the joint had excellent performance.https://www.mdpi.com/2075-4701/14/12/14437075 aluminum alloy7075 welding wirewelding processorganizationperformance |
| spellingShingle | Chunkai Zhou Xiaoping Li Gao Hua Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing Metals 7075 aluminum alloy 7075 welding wire welding process organization performance |
| title | Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing |
| title_full | Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing |
| title_fullStr | Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing |
| title_full_unstemmed | Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing |
| title_short | Research on the Weldability and Service Performance of 7075 Aluminum Alloy Welding Wire Prepared by Spray Forming–Extrusion–Drawing |
| title_sort | research on the weldability and service performance of 7075 aluminum alloy welding wire prepared by spray forming extrusion drawing |
| topic | 7075 aluminum alloy 7075 welding wire welding process organization performance |
| url | https://www.mdpi.com/2075-4701/14/12/1443 |
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