Scholarlink

<p>We studied how cutting speed shapes kerf geometry in laser cutting of 2&#xa0;mm S235 steel. We also examined its effect on the transfer of kinetic energy from the assist gas to the melt. Across a wide range of speeds, we measured the width of the cutting kerfs and described how the geometry changed with speed. Lower speeds produce more divergent kerfs, which correlates with burr formation and edge oxidation, while intermediate speeds keep the edges closer to parallel and reduce defects. We complemented the measurements with computational fluid dynamics (CFD) simulations based on geometries derived from measured cutting kerfs. The simulations resolve separation of the gas flow, fields of static pressure, and shear stresses. From experiments and simulations, we defined a dimensionless expansion ratio that describes gas expansion inside the kerf. The ratio provides a practical criterion for the performance of the gas flow and links geometry to the risk of defects. Small values are associated with flow that stays attached to the wall, and large values indicate geometry that promotes separation and defects. All findings apply within the considered parameters.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of the kerf geometry on the flow field and the transfer of kinetic energy to the melt during laser fusion cutting as a function of cutting speed

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月1日

查看全文
  • Sven Thomas,
  • John Powell,
  • Nicolai Speker,
  • Tim Hesse,
  • Christian Hagenlocher,
  • Thomas Graf

摘要

We studied how cutting speed shapes kerf geometry in laser cutting of 2 mm S235 steel. We also examined its effect on the transfer of kinetic energy from the assist gas to the melt. Across a wide range of speeds, we measured the width of the cutting kerfs and described how the geometry changed with speed. Lower speeds produce more divergent kerfs, which correlates with burr formation and edge oxidation, while intermediate speeds keep the edges closer to parallel and reduce defects. We complemented the measurements with computational fluid dynamics (CFD) simulations based on geometries derived from measured cutting kerfs. The simulations resolve separation of the gas flow, fields of static pressure, and shear stresses. From experiments and simulations, we defined a dimensionless expansion ratio that describes gas expansion inside the kerf. The ratio provides a practical criterion for the performance of the gas flow and links geometry to the risk of defects. Small values are associated with flow that stays attached to the wall, and large values indicate geometry that promotes separation and defects. All findings apply within the considered parameters.