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<p>The influence of external constraint time on the stress and deformation caused by laser welding of thin SUS301L stainless steel was quantitatively studied. Due to the inability to accurately control the fixture constraint time in the experiment, this paper uses a three-dimensional thermal elastoplastic finite element simulation method to study the deformation, stress, and strain changes of welded stainless steel plates under different fixture constraint times. In order to improve simulation accuracy, the relationship between mesh size and thermal input in finite element analysis is analyzed. The method of sequential coupling thermo-mechanic is proposed to analyze the transient temperature field and deformation during welding. The thermal and mechanical material properties used in the simulation follow a non-linear relationship as a function of temperature. Meanwhile, the accuracy of the simulation model was verified based on the temperature history by the K-type thermocouple and weld profile measured. The results show that the length of the clamp restraint time will indeed have a certain effect on the deformation after welding. Release of the clamp 25&#xa0;s after the end of welding can effectively reduce the welding deformation from 1.3 to 1.21&#xa0;mm, which is a 7% reduction.</p>

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Numerical study on the effect of constraint duration on stress and deformation in SUS301L stainless-steel plates during laser welding

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Liu Zuguo,
  • Qin Xinmao,
  • Liao Jianhua,
  • Wu Jiazhu

摘要

The influence of external constraint time on the stress and deformation caused by laser welding of thin SUS301L stainless steel was quantitatively studied. Due to the inability to accurately control the fixture constraint time in the experiment, this paper uses a three-dimensional thermal elastoplastic finite element simulation method to study the deformation, stress, and strain changes of welded stainless steel plates under different fixture constraint times. In order to improve simulation accuracy, the relationship between mesh size and thermal input in finite element analysis is analyzed. The method of sequential coupling thermo-mechanic is proposed to analyze the transient temperature field and deformation during welding. The thermal and mechanical material properties used in the simulation follow a non-linear relationship as a function of temperature. Meanwhile, the accuracy of the simulation model was verified based on the temperature history by the K-type thermocouple and weld profile measured. The results show that the length of the clamp restraint time will indeed have a certain effect on the deformation after welding. Release of the clamp 25 s after the end of welding can effectively reduce the welding deformation from 1.3 to 1.21 mm, which is a 7% reduction.