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<p>Activated flux tungsten inert gas (A-TIG) welding requires high heat input to achieve through thickness penetration using single pass in thick (&gt;3&#xa0;mm) plates. In present work, a novel approach is proposed to reduce the required heat input in A-TIG welding by applying pulse current instead of constant current during welding. Pulse current-activated flux tungsten inert gas (PC-ATIG) welding successfully achieved through thickness penetration in 8&#xa0;mm thick plates of P92 steel using less heat input (1.28&#xa0;kJ/mm). The welding arc profile, arc force and weld crater geometry were studied to understand the mechanism for improved penetrability in PC-ATIG welding. During the pulse cycles, with the variation in welding arc profile, the repetitive and huge impact of arc force pushed the weld pool surface down and accelerated the molten fluid flow in downward direction, resulting in improved penetrability in PC-ATIG welding. Additionally, the integrity of developed weld joint was assessed in terms of metallurgical and mechanical behavior. In tensile testing, the weld joint was found to be stronger than the base metal with ultimate tensile strength as 786.9&#xa0;MPa, yield strength as 748.7&#xa0;MPa and elongation as 16.7%. The post weld heat treatment improved the impact toughness (52 ± 3 J) of weld fusion zone.</p>

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Activated Flux Tungsten Inert Gas Welding of P92 Steel Using Pulse Current to Reduce Welding Heat Input

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Pratishtha Sharma,
  • Dheerendra Kumar Dwivedi,
  • Gaurav Sharma

摘要

Activated flux tungsten inert gas (A-TIG) welding requires high heat input to achieve through thickness penetration using single pass in thick (>3 mm) plates. In present work, a novel approach is proposed to reduce the required heat input in A-TIG welding by applying pulse current instead of constant current during welding. Pulse current-activated flux tungsten inert gas (PC-ATIG) welding successfully achieved through thickness penetration in 8 mm thick plates of P92 steel using less heat input (1.28 kJ/mm). The welding arc profile, arc force and weld crater geometry were studied to understand the mechanism for improved penetrability in PC-ATIG welding. During the pulse cycles, with the variation in welding arc profile, the repetitive and huge impact of arc force pushed the weld pool surface down and accelerated the molten fluid flow in downward direction, resulting in improved penetrability in PC-ATIG welding. Additionally, the integrity of developed weld joint was assessed in terms of metallurgical and mechanical behavior. In tensile testing, the weld joint was found to be stronger than the base metal with ultimate tensile strength as 786.9 MPa, yield strength as 748.7 MPa and elongation as 16.7%. The post weld heat treatment improved the impact toughness (52 ± 3 J) of weld fusion zone.