Scholarlink

<p>To address the challenges associated with positive pressure arc (PPA) welding, particularly its detrimental impact on molten pool stability in thin-wall structures, this study introduces an innovative approach based on negative pressure arc (NPA) welding or additive manufacturing (AM) techniques. In contrast to conventional PPA welding, which generates repulsive forces (RE), the proposed NPA welding produces arc forces characterized by adsorption effects (AE). By integrating a pumping gas into hollow tungsten arc (HTA) welding or AM processes, the system is designed to generate NPA forces. This advanced methodology is termed pumping gas hollow tungsten (PHT) negative pressure arc (PHT-NPA) welding or AM. To establish a comprehensive understanding and facilitate the development of this novel NPA welding or AM technology, this study investigates the fundamental conditions required for the formation of PHT-NPA welding. A multi-physics model is employed to analyze the arc temperature field, velocity field, pressure field, and current density distribution. The study elucidates the relationships between the pumping gas pressure and arc negative forces. Additionally, it identifies the critical threshold values of key welding parameters for pumping gas hollow tungsten arc (PHTA) welding and quantifies the operational range of the NPA. This research elucidates the formation mechanisms and fundamental principles of PHT-NPA welding, proposes a robust arc design framework for PHT-NPA welding or AM, and provides a novel research direction for overcoming molten pool stability challenges in PPA welding or AM.</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

Design principles and distribution characteristics of welding arc in a novel pumping gas hollow tungsten negative pressure arc welding and additive manufacturing method for thin-wall structures

  • 期刊论文

  • 发表日期：

    2025年4月23日

查看全文
  • Ying Wang,
  • Kefeng Xu,
  • Zihan Tang,
  • Jianhui Yuan,
  • Jian Luo

摘要

To address the challenges associated with positive pressure arc (PPA) welding, particularly its detrimental impact on molten pool stability in thin-wall structures, this study introduces an innovative approach based on negative pressure arc (NPA) welding or additive manufacturing (AM) techniques. In contrast to conventional PPA welding, which generates repulsive forces (RE), the proposed NPA welding produces arc forces characterized by adsorption effects (AE). By integrating a pumping gas into hollow tungsten arc (HTA) welding or AM processes, the system is designed to generate NPA forces. This advanced methodology is termed pumping gas hollow tungsten (PHT) negative pressure arc (PHT-NPA) welding or AM. To establish a comprehensive understanding and facilitate the development of this novel NPA welding or AM technology, this study investigates the fundamental conditions required for the formation of PHT-NPA welding. A multi-physics model is employed to analyze the arc temperature field, velocity field, pressure field, and current density distribution. The study elucidates the relationships between the pumping gas pressure and arc negative forces. Additionally, it identifies the critical threshold values of key welding parameters for pumping gas hollow tungsten arc (PHTA) welding and quantifies the operational range of the NPA. This research elucidates the formation mechanisms and fundamental principles of PHT-NPA welding, proposes a robust arc design framework for PHT-NPA welding or AM, and provides a novel research direction for overcoming molten pool stability challenges in PPA welding or AM.