Effect of Ceramic Shot Peening on Fatigue Properties of Laser Welded Joints of TC4-DT Alloys

XIONG Zhili; MA Wenyuan; HUA Cheng

doi:10.3969/j.issn.1674-6457.2026.08.017

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (8) : 189-198. DOI: 10.3969/j.issn.1674-6457.2026.08.017

Advanced Joining Technology

Effect of Ceramic Shot Peening on Fatigue Properties of Laser Welded Joints of TC4-DT Alloys

XIONG Zhili^*, MA Wenyuan, HUA Cheng

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Abstract

The work aims to enhance the fatigue performance of TC4-DT alloy laser welded joints by surface strengthening through ceramic shot peening, clarify the influence of shot peening parameters and fatigue stress levels on the fatigue performance of the joints, and reveal the intrinsic mechanism underlying the improvement of fatigue performance. Two TC4-DT alloy plates were mechanically ground prior to welding. Preliminary laser welding was performed under a pure argon atmosphere, followed by drilling a hole at the center of the weld seam to simulate porosity repair. Subsequent tungsten inert gas welding was conducted to repair the weld seam, yielding a void-free butt joint. Furthermore, the surfaces of the aforementioned welded joints were treated by ceramic shot peening. Residual stress, surface roughness, and hardness of the joints were tested before and after ceramic shot peening. Techniques such as acanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were employed to characterize the fatigue fracture surfaces and microstructural morphologies of the joints. Results indicated that the fatigue limit reached 300 MPa under the laser welding parameters of 4.7 kW laser power, 20 mm/s welding speed, 200 Hz swing frequency, and 0.8 mm swing amplitude. When ceramic shot peening was performed with a pressure of 0.12 MPa, a flow rate of 1 kg/min, a jet angle of 90°, and a jet distance of (200±30) mm, the fatigue life of the joint was significantly improved. In conclusion, ceramic shot peening can optimize the surface stress state of the welded joint and thicken the surface hardened layer, thereby remarkably improving its fatigue life.

Key words

TC4-DT alloys / laser welding / ceramic shot peening / fatigue property / residual stress

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XIONG Zhili, MA Wenyuan, HUA Cheng. Effect of Ceramic Shot Peening on Fatigue Properties of Laser Welded Joints of TC4-DT Alloys[J]. Journal of Netshape Forming Engineering. 2026, 18(8): 189-198 https://doi.org/10.3969/j.issn.1674-6457.2026.08.017

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