Distribution of Al Element of Ti–6Al–4V Joints by Fiber Laser Welding

Abstract

In the process of laser welding, the uneven distribution of solute elements caused by element burning loss and flow of molten pool affects the quality of joints. In this paper, butt welding experiments were conducted on the 3 mm thick Ti–6Al–4V specimens with different preset ratios of Al and Si powders by using 4 kW fiber laser. The distribution of Al solute element and its influence on the microstructure and mechanical properties of the final weld joint were investigated. The results showed that the self-diffusion of Al element and the flow of molten pool affects the alloy elements distribution in laser welding. And the microhardness of the welded joint with Ti–6Al–4V and 90% Al + 10% Si powders was significantly higher than that with only Ti–6Al–4V, with the difference of about 130HV. At the same time, in the joint with 90% Al and 10% Si powders, the acicular α’ size was finer, and basketweave microstructure was present as well. This research is helpful to better understand the distribution of Al solute element and its influence on the joint quality during laser welding of Ti–6Al–4V alloy, which provides a certain reference for improving the weld or surface properties of Ti–6Al–4V alloy during laser processing.

Realization of Enhanced Mechanical Properties of Solid-State Welded Ti Alloy with Commercial Purity

“…4a, we note that the welded specimen exhibits sound welds without any defects such as cracks, distortion, or blow flash with a size of 5 mm is formed at the interface of the welds owing to the friction pressure during FW. In the cross-sectional macrostructure, a weld zone is formed with a size of ~ 100 μm, which is comparatively narrow relative to that of fusion-welded materials [13][14][15][16][17]. Moreover, from Fig.…”

Microstructure and Mechanical Properties of Laser Welded Al-Si Coated Hot-Press-Forming Steel Joints

“…Currently, laser welding as a joining technology has been applied more and more [10,11,12,13,14]. In the field of vehicle, laser welding, laser-arc hybrid welding, and laser welding-brazing of car parts have attracted a lot of attention [15,16,17,18].…”