Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Kalaiselvan, K.; Elango, A.; Nagarajan, N.M.

doi:10.1504/ijasmm.2017.082985

Cited by 1 publication

(2 citation statements)

References 9 publications

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“…These results correspond to previously published conclusions [ 6 , 27 , 90 , 94 ], in which offsetting the laser beam on aluminum during butt welding the minimum thickness of the IMC layer and the maximum mechanical properties can be achieved.…”

Section: Resultssupporting

confidence: 91%

“…Based on previous research [ 67 , 93 , 94 ], different welding parameters were considered for the production of the welded–brazed butt joints to investigate the effect of laser power, welding speed and laser beam offset on the temperature fields in the welding–brazing process: laser power from 1.6 kW to 2.0 kW, welding speed from 25 mm·s −1 to 30 mm·s −1 and laser beam offset from 200 μm to 460 μm from the weld centerline towards the aluminum sheet. …”

Section: Methodsmentioning

confidence: 99%

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Numerical Simulation of Temperature Fields during Laser Welding–Brazing of Al/Ti Plates

Behúlová

Babalová

2023

Materials

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The formation of dissimilar weld joints, including Al/Ti joints, is an area of research supported by the need for weight reduction and corrosion resistance in automotive, aircraft, aeronautic, and other industries. Depending on the cooling rates and chemical composition, rapid solidification of Al/Ti alloys during laser welding can lead to the development of different metastable phases and the formation of brittle intermetallic compounds (IMCs). The effort to successfully join aluminum to titanium alloys is associated with demands to minimize the thickness of brittle IMC zones by selecting appropriate welding parameters or applying suitable filler materials. The paper is focused on the numerical simulation of the laser welding–brazing of 2.0 mm thick titanium Grade 2 and EN AW5083 aluminum alloy plates using 5087 aluminum filler wire. The developed simulation model was used to study the impact of laser welding–brazing parameters (laser power, welding speed, and laser beam offset) on the transient temperature fields and weld-pool characteristics. The results of numerical simulations were compared with temperatures measured during the laser welding–brazing of Al/Ti plates using a TruDisk 4002 disk laser, and macrostructural and microstructural analyses, and weld tensile strength measurements, were conducted. The ultimate tensile strength (UTS) of welded–brazed joints increases with an increase in the laser beam offset to the Al side and with an increase in welding speed. The highest UTS values at the level of 220 MPa and 245 MPa were measured for joints produced at a laser power of 1.8 kW along with a welding speed of 30 mm·s−1 and a laser beam offset of 300 μm and 460 μm, respectively. When increasing the laser power to 2 kW, the UTS decreased. The results exhibited that the tensile strength of Al/Ti welded–brazed joints was dependent, regardless of the welding parameters, on the amount of melted Ti Grade 2, which, during rapid solidification, determines the thickness and morphology of the IMC layer. A simple formula was proposed to predict the tensile strength of welded–brazed joints using the computed cross-sectional Ti weld metal area.

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