Capabilities of infrared weld monitor

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Description

A non-obtrusive pre-aligned, solid-state device has been developed to monitor the primary infrared emissions during laser welding. The weld monitor output is a 100-1000 mV signal that depends on the beam power and weld characteristics. The DC level of this signal is related to weld penetration, while AC portions of the output can be correlated with surface irregularities and part misalignment or contamination. Changes in DC behavior are also noted for both full and deep penetration welds. Full penetration welds are signified by an abrupt reduction in the weld monitor output. Bead on plate welds were made on steel, aluminum, ... continued below

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17 p.

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Sanders, P.G.; Keske, J.S.; Leong, K.H. & Kornecki, G. November 1, 1997.

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Description

A non-obtrusive pre-aligned, solid-state device has been developed to monitor the primary infrared emissions during laser welding. The weld monitor output is a 100-1000 mV signal that depends on the beam power and weld characteristics. The DC level of this signal is related to weld penetration, while AC portions of the output can be correlated with surface irregularities and part misalignment or contamination. Changes in DC behavior are also noted for both full and deep penetration welds. Full penetration welds are signified by an abrupt reduction in the weld monitor output. Bead on plate welds were made on steel, aluminum, and magnesium with both a CW CO{sub 2} laser and a pulsed Nd:YAG laser to explore the relationships between the weld characteristics and the weld monitor output.

Physical Description

17 p.

Notes

OSTI as DE98000647

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  • 16. international congress on applications of laser and electro-optics, San Diego, CA (United States), 17-20 Nov 1997

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  • Other: DE98000647
  • Report No.: ANL/TD/CP--93200
  • Report No.: CONF-971149--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 542051
  • Archival Resource Key: ark:/67531/metadc696984

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Creation Date

  • November 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 12:05 p.m.

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Sanders, P.G.; Keske, J.S.; Leong, K.H. & Kornecki, G. Capabilities of infrared weld monitor, article, November 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc696984/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.