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In Situ Observation of Solidification Conditions in Pulsed Laser Welding of AL6082 Aluminum Alloys to Evaluate Their Impact on Hot Cracking Susceptibility

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Philipp von Witzendorff
  • Stefan Kaierle
  • Oliver Suttmann
  • Ludger Overmeyer

External Research Organisations

  • Laser Zentrum Hannover e.V. (LZH)

Details

Original languageEnglish
Pages (from-to)1678-1688
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume46
Issue number4
Publication statusPublished - Apr 2015
Externally publishedYes

Abstract

The influence of laser pulse parameters on solidification conditions and hot crack formation in pulsed laser welding of Al6082 aluminum alloys was studied with the aid of high-speed cameras capturing visible and infrared radiation. Hot cracking was evaluated with respect to strain rate, strain, and metallurgical outcome. The strain rate was approximated by the product of interface velocity and temperature gradient at the interface. The temperature gradient decreases during the course of solidification and followed a specific course. The interface velocity was therefore used as an indicator for the strain rate, which increased in a logarithmic manner with respect to the slope of the laser pulse’s cooling time. The accumulated strain was calculated by measuring the spot weld deformation during solidification. Within the heat-conduction welding regime, hot cracking can be reduced by lowering the interface velocity leading to a reduced strain rate and enhanced permeability of the dendritic microstructure. An over-proportional increase of the accumulated strain was observed for keyhole welding, which led to a high susceptibility to hot cracking regardless of the interface velocity. At low interface velocities, hot cracking was induced by extensive hydrogen diffusion at the solid–liquid interface, which promotes crack initiation.

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In Situ Observation of Solidification Conditions in Pulsed Laser Welding of AL6082 Aluminum Alloys to Evaluate Their Impact on Hot Cracking Susceptibility. / von Witzendorff, Philipp; Kaierle, Stefan; Suttmann, Oliver et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 46, No. 4, 04.2015, p. 1678-1688.

Research output: Contribution to journalArticleResearchpeer review

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abstract = "The influence of laser pulse parameters on solidification conditions and hot crack formation in pulsed laser welding of Al6082 aluminum alloys was studied with the aid of high-speed cameras capturing visible and infrared radiation. Hot cracking was evaluated with respect to strain rate, strain, and metallurgical outcome. The strain rate was approximated by the product of interface velocity and temperature gradient at the interface. The temperature gradient decreases during the course of solidification and followed a specific course. The interface velocity was therefore used as an indicator for the strain rate, which increased in a logarithmic manner with respect to the slope of the laser pulse{\textquoteright}s cooling time. The accumulated strain was calculated by measuring the spot weld deformation during solidification. Within the heat-conduction welding regime, hot cracking can be reduced by lowering the interface velocity leading to a reduced strain rate and enhanced permeability of the dendritic microstructure. An over-proportional increase of the accumulated strain was observed for keyhole welding, which led to a high susceptibility to hot cracking regardless of the interface velocity. At low interface velocities, hot cracking was induced by extensive hydrogen diffusion at the solid–liquid interface, which promotes crack initiation.",
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Download

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AU - Suttmann, Oliver

AU - Overmeyer, Ludger

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