Development of ceramic-coated weld backing bars

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Description

In shipbuilding and many other industries, copper weld backing bars are used to draw the heat out of the weld. The problem that some users of these bars encounter is that these bars, on occasion, actually melt in spots and become welded to the weld plates. After this happens a number of times, the backing bar becomes so degraded that it must be either discarded or machined, both of which are very costly and time-consuming actions. To avoid this fusion between the backing bar and the weld plate, the weld processes that are used cannot be ones of high beat ... continued below

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9 p.

Creation Information

Eggleston, B.R. October 20, 1994.

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Description

In shipbuilding and many other industries, copper weld backing bars are used to draw the heat out of the weld. The problem that some users of these bars encounter is that these bars, on occasion, actually melt in spots and become welded to the weld plates. After this happens a number of times, the backing bar becomes so degraded that it must be either discarded or machined, both of which are very costly and time-consuming actions. To avoid this fusion between the backing bar and the weld plate, the weld processes that are used cannot be ones of high beat input. This requirement is very limiting when thick plates are being welded. The plates must be beveled, and more weld passes must be run. These problems are also costly and time consuming. The aim of this project is to find a way to produce backing bars with nearly the same `chilling` effect but with both a greater resistance to molten metal and resistance to arcing to the backing bar itself. A possible solution currently being tested is to coat the copper bars with a thin layer of a ceramic coating. The procedure used was to coat the copper bars with either alumina or spinel by a plasma spraying method.

Physical Description

9 p.

Notes

OSTI as DE95009313

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  • Other Information: PBD: 20 Oct 1994

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  • Other: DE95009313
  • Report No.: Y/DV--1356
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/39123 | External Link
  • Office of Scientific & Technical Information Report Number: 39123
  • Archival Resource Key: ark:/67531/metadc681131

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Office of Scientific & Technical Information Technical Reports

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  • October 20, 1994

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Jan. 19, 2016, 12:42 p.m.

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Eggleston, B.R. Development of ceramic-coated weld backing bars, report, October 20, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc681131/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.