JU Qiping, WANG Ligao, XU Mingfang, et al.Influence of Pulse Width on Laser Micro-weld Formation and Mechanical Properties of Sub-micron TC4 Titanium Alloy[J].Electric Welding Machine, 2022, 52(6): 126-130.
JU Qiping, WANG Ligao, XU Mingfang, et al.Influence of Pulse Width on Laser Micro-weld Formation and Mechanical Properties of Sub-micron TC4 Titanium Alloy[J].Electric Welding Machine, 2022, 52(6): 126-130. DOI: 10.7512/j.issn.1001-2303.2022.06.16.
Influence of Pulse Width on Laser Micro-weld Formation and Mechanical Properties of Sub-micron TC4 Titanium Alloy
TC4 titanium alloy has attracted extensive attention in various fields because of its excellent weldability. The butt welding of 0.2 mm TC4 titanium alloy sheet was carried out by pulse laser welding. The effects of pulse width on weld formation, microstructure and joint strength were studied. The results show that the microstructure of the weld is composed of needle martensite α' phase with random orientation due to the high cooling rate. With the increase of pulse width, the joint morphology changes from semicircle to X shape. When the pulse width is between 2.7 ms and 4.9 ms, the tensile strength of the sample increases gradually, and reaches the maximum value (898.58 MPa) when the pulse width is 4.9 ms. The hardness test results show that the increase of pulse width leads to the increase of welding line energy. When the pulse width is 4.5 ms, the microhardness of weld zone reaches the maximum value (379 HV).
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