Year: 2025
Type: article
Abstract: The occurrence of the humping phenomenon limits the achievable welding speed in laser beam micro welding processes, thereby constraining reductions in processing time when joining 1.4404 stainless-steel sheets.This weld defect manifests as periodic protuberances along the weld seam surface and negatively affects the mechanical integrity and leak-tightness of the joint.The humping threshold -the welding speed at which these irregularities appear -is typically reached starting around 30 m/min, depending on laser beam characteristics and material properties.The formation of humps is influenced by multiple factors, with melt pool dynamics and flow velocity identified as key contributors.These can be affected by the intensity distribution of laser power.In this work, the effect of introducing an additional laser beam in two configurations to achieve different intensity profiles is investigated.The analysis focuses on hump height and frequency, the presence of pre-humping and humping effects, and weld seam width.The results indicate that dual beam configurations can reduce or eliminate humping under certain conditions, suggesting a stabilization of the keyhole and melt pool dynamics.The findings contribute to a better understanding of humping suppression mechanisms and support the potential for increasing welding speeds beyond 30 m/min without compromising weld seam quality.
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4416224053
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