Citation: | WANG Jinqi, LI Junchen, ZHAO Yaobang, XIE Yuming, MENG Xiangchen, HUANG Yongxian. Formation and properties of aluminum-steel transition joints processed by friction stir additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2025, 46(2): 18-24. DOI: 10.12073/j.hjxb.20240905002 |
Considering the difficulties of low strength and limited application of aluminum-steel joining, a wire-based friction stir additive manufacturing method was proposed and utilized for the aluminum-steel transition joints. 5B06 aluminum alloy wires and 3 mm 316L stainless steel sheets were used as feedstock and substrate, respectively. Aluminum-steel transition joints with good forming and excellent mechanical performance were manufactured with laser texture assistance at a deposition efficiency of 3.0 kg/h and a single-layer thickness of 1.0 mm. The wires were thermo-plasticized and filled into the textured groove. No defect was observed along the interface. Metallurgical bonding was achieved by Al/Fe intermetallic compounds (IMCs) layers with a thickness of 1.8 μm. The shear strength of the joint reached 110.0 MPa ± 4.7 MPa, which increased by 18% relative to the joints with untreated surfaces. Aluminum alloys and IMCs (Fe2Al5 and Fe4Al13) were noticed on the fracture of the steel side, indicating that sound bonding was achieved by mechanical and metallurgical joining. The fracture mode of the joints was tough-brittle composite fracture. This method showed great potential in manufacturing aluminum-steel transition joints.
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