| METALS AND METAL MATRIX COMPOSITES |
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| Study on the Microstructure and Properties of TC4 Titanium Alloy Self-rotating Arc Welded Joints |
| HUANG Shaofu1, QIU Renjie1, REN Yan2, LIU Ganlin3, LIU Jian4,*, YAO Jukun3
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1 School of Mechatronic Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2 North Vehicle Factory, China North Industries Group Corporation, Beijing 100072, China
3 Integrated Protection Center for Equipment, Army Academy of Armored Forces, Beijing 100072, China
4 National Engineering Research Center for Remanufacturing of Machinery Products, Army Academy of Armored Forces, Beijing 100072, China |
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Abstract This paper presents the design and preparation of TC4 titanium alloy cable-type welding wire. Based on this, MIG welding experiments were conducted using the TC4 titanium alloy self-rotating arc welding process, and the microstructure and properties of the welded joints were systematically studied. The results revealed that the weld zone (WZ) exhibited a "basketweave microstructure", while the heat affected zone (HAZ) consisted of equiaxed grains. The strength of the {0001} basal planes in the crystal structures of both the WZ and base metal (BM) was significantly higher than that of the {1010} prismatic planes. Compared to the base metal, the grains in both the WZ and HAZ were significantly refined, with average grain sizes of 0.18 μm and 0.15 μm, respectively. The average hardness of these zones also increased to 393HV0.2 and 364HV0.2, respectively. In comparison with the WZ, the HAZ exhibited a more disordered grain orientation and finer average grain size, with a correspondingly lower proportion of small-angle grain boundaries (17.69%) compared to the 59.47% observed in the weld zone. Electrochemical testing indicated that the weld’s capacitive arc bending degree was greater than that of the base material, and its corrosion potential (-0.594 VSCE) was higher than that of the base material’s -0.646 VSCE, suggesting superior corrosion resistance of the welded joint. As a novel welding mate-rial, cable-type welding wire offers advantages such as portability, cost-effectiveness, high quality, and environmental sustainability. Compared to conventional flux-cored welding wire, it better meets the needs of modern manufacturing and represents a significant future direction for the development of welding materials.
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Published: 25 June 2026
Online: 2026-07-08
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2026, Vol. 40 
