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<p>A critical aspect of laser spot welding is the determination of weld strength. This study focuses on examining the effects of laser parameters on the torsional strength and peel force of the spot weld. In this paper, circular-like laser spot welding was performed on 0.7&#xa0;mm thick sheets of stainless steel 316&#xa0;L using an overlapping edges configuration. A pulsed fiber laser welding system was utilized for the experiments. The study systematically varied three parameters: laser peak power (350, 400 and 450&#xa0;W), laser speed (8, 10, and 12&#xa0;mm/s), and laser pulse duty cycle (50%, 60%, and 70%), to evaluate their effects and interactions on spot weld performance, and the optimum levels of the parameters were determined for maximum strength using signal to noise analysis. Taguchi L9 method was used to design the experiments. The experimental results showed that by increasing the laser peak power and laser pulse duty cycle, both torsional strength and peel force increased. In contrast, when laser speed increased from 8&#xa0;mm/s to 10&#xa0;mm/s, the torsional strength and peel force increased, while by increasing the laser speed from 10&#xa0;mm/s to 12&#xa0;mm/s, all the mentioned parameters decreased. In addition, the results showed that the optimal level of the laser peak power, the laser speed, and the laser pulse duty cycle for both torsional strength and peel force are 450&#xa0;W, 10&#xa0;mm/s, and 70%, respectively.</p>

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Investigation of the Effects of Laser Parameters on the Torsional Strength and Peel Force in Laser Spot Welding of 316L Austenitic Stainless Steel Sheet

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Mehdi Modabberifar,
  • Abdullah Al-Sammarraie,
  • Hussein Al-Shareefi,
  • Moein Taheri,
  • Mohammad javad Torkamany

摘要

A critical aspect of laser spot welding is the determination of weld strength. This study focuses on examining the effects of laser parameters on the torsional strength and peel force of the spot weld. In this paper, circular-like laser spot welding was performed on 0.7 mm thick sheets of stainless steel 316 L using an overlapping edges configuration. A pulsed fiber laser welding system was utilized for the experiments. The study systematically varied three parameters: laser peak power (350, 400 and 450 W), laser speed (8, 10, and 12 mm/s), and laser pulse duty cycle (50%, 60%, and 70%), to evaluate their effects and interactions on spot weld performance, and the optimum levels of the parameters were determined for maximum strength using signal to noise analysis. Taguchi L9 method was used to design the experiments. The experimental results showed that by increasing the laser peak power and laser pulse duty cycle, both torsional strength and peel force increased. In contrast, when laser speed increased from 8 mm/s to 10 mm/s, the torsional strength and peel force increased, while by increasing the laser speed from 10 mm/s to 12 mm/s, all the mentioned parameters decreased. In addition, the results showed that the optimal level of the laser peak power, the laser speed, and the laser pulse duty cycle for both torsional strength and peel force are 450 W, 10 mm/s, and 70%, respectively.