Abstract
Ti4Al6V and 6061 Al dissimilar metals were butt welded by the laser oscillating welding method. The effects of laser offset, oscillation frequency, and energy distribution on the formation, microstructure, and tensile properties of dissimilar metal joints are discussed in detail. The experimental results show that the Ti6Al4V was micro melted with a laser offset of 1.1 mm, and a large number of intermetallic compounds (IMCs) were formed on the side of the Ti6Al4V. Additionally, there were some porosity defects in the fusion zone (FZ) due to an inappropriate laser oscillation frequency. When the laser offset was increased to 1.2 mm, the IMC distribution was uniform and the thickness was controlled below 2 μm. The porosity defects in the FZ decreased and the tensile strength of the joints increased significantly. The maximum value of tensile strength reached 173 MPa at a laser frequency of 28 Hz.
Highlights
Low-density hybrid components consisting of dissimilar metals such as Ti/Al, Al/steel, Ti/Mg, and Mg/steel have excellent material properties and find applications in automobile, aerospace, rail transportation, and other fields [1,2,3,4]
High cooling rate, and fast welding, the laser welding–brazing technique is recommended for joining dissimilar metals
In order to form a stable brazing joint on the side of the Ti6Al4V alloy without melting the Ti6Al4V, a fiber laser was chosen with beam oscillation to join the Ti/Al butt joints
Summary
Low-density hybrid components consisting of dissimilar metals such as Ti/Al, Al/steel, Ti/Mg, and Mg/steel have excellent material properties and find applications in automobile, aerospace, rail transportation, and other fields [1,2,3,4]. Guo et al [26] investigated the effect of a TC4 remelting process on the tensile strength of welded joints, and found that, due to the solute redistribution process, the tensile strength increased from 142 to 165 MPa. Wang et al [27] studied the effect of Zn foil addition on the formation of IMCs and the mechanical properties of joints for the welding of Ti6Al4V and Al5052 via TIG welding. The mechanical properties of joints can be further improved In this manuscript, Ti6Al4V and AA6061 sheet metals were joined using a welding method based on laser oscillation using optimized energy distribution. The effects of laser offset and oscillation frequency on the formation, microstructure, and tensile properties of the dissimilar Ti/Al joints were investigated in detail The aim of this manuscript was to obtain the welding characteristics of the laser oscillating welding process for Ti/Al dissimilar metals
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