Abstract
A cold metal transfer (CMT) Twin welding-brazing technique was applied to Ti/Al dissimilar metals for the first time. Significant improvements in intermetallic compound (IMC) suppression and joint strength were obtained. Compared with the normal CMT, the reasonable range of the welding heat input was extended by 15.4%, the IMC thickness was further suppressed to 0.53 μm, the maximum tensile strength of the joint was up to 297 MPa, and the fracture position was transferred from the IMC layer to the base aluminum, by employing the CMT Twin. The serrated IMC was identified to be Ti (Al, Si)3 by TEM and evenly distributed at the interface layer. Whether for the common single-wire CMT or CMT Twin, with decreasing heat input, the IMC thickness decreased, and the joint strength increased. The CMT Twin shows significant advantages over the traditional single-wire CMT in terms of a higher welding speed, lower heat input, thinner IMC thickness, and higher joint strength on the joining of incompatible dissimilar alloys.
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Funding
The authors are thankful for the financial support provided by the National Natural Science Foundation of China (Grant No. 52005112, 51605263), Science and Technology Planning Project of Guangzhou City (Grant No. 201807010035, 201807010011), and Science and Technology Planning Project of Guangdong Academy of Sciences (Grant No. 2020GDASYL-20200402006, 2020GDASYL-20200302013).
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Xu, W., Wang, W., Yang, Q. et al. CMT Twin welding-brazing of aluminum to titanium. Weld World 66, 1121–1130 (2022). https://doi.org/10.1007/s40194-022-01288-3
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DOI: https://doi.org/10.1007/s40194-022-01288-3