Adiabatic surface thermometer for improved production braze quality

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An adiabatic surface thermometer was developed to control automatically the critical temperature-time cycle of a production vacuum-brazing process. Investigations revealed that optimum braze-joint strength required precise control of the brazing temperature. Spot-welded thermocouples could not be used because the spot welds cause surface damage. This thermometer touches the surface and uses a differential thermocouple and heater to measure surface temperature without heat flow, thereby eliminating large errors caused by conduction losses common to conventional spring-loaded thermocouples. Temperatures in air or vacuum are measured to 800$sup 0$C with errors less than 5$sup 0$C. This thermometer has minimized the rejection of production ... continued below

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Pages: 13

Creation Information

Dittbenner, G.R. August 27, 1975.

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Description

An adiabatic surface thermometer was developed to control automatically the critical temperature-time cycle of a production vacuum-brazing process. Investigations revealed that optimum braze-joint strength required precise control of the brazing temperature. Spot-welded thermocouples could not be used because the spot welds cause surface damage. This thermometer touches the surface and uses a differential thermocouple and heater to measure surface temperature without heat flow, thereby eliminating large errors caused by conduction losses common to conventional spring-loaded thermocouples. Temperatures in air or vacuum are measured to 800$sup 0$C with errors less than 5$sup 0$C. This thermometer has minimized the rejection of production parts, resulting in a cost saving to the U. S. Energy Research and Development Administration. (auth)

Physical Description

Pages: 13

Notes

Dep. NTIS

Source

  • SME/ERDA welding and joining workshop, Chicago, Illinois, USA, 28 Oct 1975

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  • Report No.: UCRL--77295
  • Report No.: CONF-751012--8
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4167006
  • Archival Resource Key: ark:/67531/metadc870228

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Creation Date

  • August 27, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

Description Last Updated

  • Oct. 18, 2016, 1:07 p.m.

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Dittbenner, G.R. Adiabatic surface thermometer for improved production braze quality, article, August 27, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc870228/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.