A Study on the Microstructure and Fatigue Properties of Welding Joints in Vibration‐Assisted Laser Welding Process. Issue 4 (29th December 2019)

• Record Type: Journal Article
• Authors: Jin, Jiewen; Lu, Qinghua; Zhang, Peilei; Li, Chonggui; Yan, Hua
• Is Part Of: Steel research international. Volume 91:Issue 4(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-12-29
• Subjects: fatigue performances -- laser welding -- microstructures -- vibrations; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201900548
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : A vibration‐assisted laser welding experiment of 4.5 mm industrial pure iron is conducted to focus on the influences of vibration parameters on microstructure, fatigue fracture, and fatigue life. The studies show that the microstructure of the joint is optimized under the condition of 1186 HZ vibration frequency and 36.1 m s −2 vibration acceleration; it is also found that a suitable microvibration process can enhance the penetration depth of the joints, reduce the number of columnar crystals, and homogenize the microhardness. In high‐cycle fatigue experiments, the base material (BM) produces fatigue fracture only under the fatigue load of 52% R m, the fatigue source area under vibration is at the corner of the fracture or at the inside of the weld seam; a functional consequence is that the vibration can increase the fatigue load strength by 1–3 percentage points, and the fatigue life can be increased by 0.8–1.5 multiples. The microvibration can effectively improve the fatigue performance and increase the fatigue life. Abstract : Herein, based on the vibration‐assisted laser welding experiments to investigate the effects of microvibration on welding joints, the experimental results show that microvibration significantly improves the microstructure and fatigue performance of welding joints; in addition, the best vibration process parameters are obtained in this research, which is a potential way to improve welding quality and fatigue life.