Laser weld penetration estimation using temperature measurements

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Penetration depth is an important factor critical to the quality of a laser weld. This paper examines the feasibility of using temperature measurements on the bottom surface of the work-piece to estimate weld penetration. A three-dimensional analytical model relating penetration depth, weld bead width and welding speed to temperature distribution at the bottom surface of the workpiece is developed. Temperatures on the bottom surface of the workpiece are measured using infrared thermocouples located behind the laser beam. Experimental results from bead-on-plate welds on low carbon steel plates of varying thickness at different levels of laser power and speeds validate the ... continued below

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26 p.

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Lankalapalli, K.N.; Tu, J.F.; Leong, K.H. & Gartner, M. October 1, 1997.

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Description

Penetration depth is an important factor critical to the quality of a laser weld. This paper examines the feasibility of using temperature measurements on the bottom surface of the work-piece to estimate weld penetration. A three-dimensional analytical model relating penetration depth, weld bead width and welding speed to temperature distribution at the bottom surface of the workpiece is developed. Temperatures on the bottom surface of the workpiece are measured using infrared thermocouples located behind the laser beam. Experimental results from bead-on-plate welds on low carbon steel plates of varying thickness at different levels of laser power and speeds validate the model and show that the temperature on the bottom surface is a sensitive indicator of penetration depth. The proposed model is computationally efficient and is suitable for on-line process monitoring application.

Physical Description

26 p.

Notes

OSTI as DE98000738

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  • Other Information: PBD: [1997]

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  • Other: DE98000738
  • Report No.: ANL/TD/PP--91464
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/541922 | External Link
  • Office of Scientific & Technical Information Report Number: 541922
  • Archival Resource Key: ark:/67531/metadc691181

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 1:27 p.m.

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Lankalapalli, K.N.; Tu, J.F.; Leong, K.H. & Gartner, M. Laser weld penetration estimation using temperature measurements, report, October 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc691181/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.