Effect of line spacing on nanosecond pulsed laser welding of AZ31B magnesium alloy and 304 stainless steel

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-02-20 DOI:10.1016/j.optlastec.2025.112624

Jiaqi Wan, Xikang Cheng, Mengde Zhou, Ying Yan

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Abstract

Nanosecond pulse laser welding was performed on AZ31B magnesium alloy and 304 stainless steel. The study explored the effects of varying line spacing on the weld joint morphology, microstructure, and fracture properties, while keeping other parameters constant. The temperature field during the magnesium/steel laser welding process was simulated using COMSOL software. Results indicated that when the line spacing was 0.04 mm, the welding surface exhibited cracks and a significant amount of oxides due to excessive heat input. However, at a line spacing of 0.2 mm, there were fewer defects and a larger bonding area at the interface. As line spacing increased, the path for heat conduction between welds became longer, leading to a reduction in thermal interaction between adjacent welds and poorer welding performance. Shear force test results showed that the fractured shear force was achieved at a line spacing of 0.2 mm. Additionally, the fracture modes were classified as matrix embrittlement failure (MEF), substrate tearing failure (STF), and interfacial failure (IF).

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线距对AZ31B镁合金与304不锈钢纳秒脉冲激光焊接的影响

采用纳秒脉冲激光焊接AZ31B镁合金和304不锈钢。该研究探讨了在保持其他参数不变的情况下，不同线间距对焊缝形貌、显微组织和断裂性能的影响。利用COMSOL软件对镁/钢激光焊接过程中的温度场进行了数值模拟。结果表明：当线距为0.04 mm时，由于热输入过多，焊接表面出现裂纹和大量氧化物；而在线间距为0.2 mm时，界面处的缺陷较少，结合面积较大。随着线间距的增加，焊缝之间的热传导路径变长，导致相邻焊缝之间的热相互作用减少，焊接性能变差。剪切力试验结果表明，在线间距为0.2 mm处实现断裂剪切力。此外，断裂模式分为基体脆化破坏（MEF）、基体撕裂破坏（STF）和界面破坏（IF）。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems