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<p>A major challenge in welding ferritic stainless steel is the pronounced grain growth that occurs in both the weld zone and the heat-affected zone (HAZ), which adversely affects the mechanical properties of the weld joint. To address this issue, a low heat-input welding approach using a repetitive nanosecond (ns) pulsed laser was employed. This experimental study investigates dissimilar spot welding between 0.8&#xa0;mm thick ferritic and austenitic stainless steel sheets using a 200&#xa0;W average-power nanosecond pulsed fiber laser. The experiments were designed to examine the influence of laser processing parameters on microstructural evolution and mechanical performance. Mechanical properties were evaluated through tensile shear testing and microhardness measurements, while microstructural characteristics were analyzed using optical microscopy and scanning electron microscopy (SEM). The results demonstrated that ns pulsed laser welding effectively suppressed grain coarsening in the HAZ of ferritic stainless steel and provided superior tensile strength compared to conventional welding methods.</p>

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Dissimilar Spot Welding of Ferritic and Austenitic Stainless Steels Using a Nanosecond Pulsed Fiber Laser

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Ketul Shah,
  • Aniruddha Kumar

摘要

A major challenge in welding ferritic stainless steel is the pronounced grain growth that occurs in both the weld zone and the heat-affected zone (HAZ), which adversely affects the mechanical properties of the weld joint. To address this issue, a low heat-input welding approach using a repetitive nanosecond (ns) pulsed laser was employed. This experimental study investigates dissimilar spot welding between 0.8 mm thick ferritic and austenitic stainless steel sheets using a 200 W average-power nanosecond pulsed fiber laser. The experiments were designed to examine the influence of laser processing parameters on microstructural evolution and mechanical performance. Mechanical properties were evaluated through tensile shear testing and microhardness measurements, while microstructural characteristics were analyzed using optical microscopy and scanning electron microscopy (SEM). The results demonstrated that ns pulsed laser welding effectively suppressed grain coarsening in the HAZ of ferritic stainless steel and provided superior tensile strength compared to conventional welding methods.