Welding Behavior of Free Machining Stainless Steel

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The weld solidification and cracking behavior of sulfur bearing free machining austenitic stainless steel was investigated for both gas-tungsten arc (GTA) and pulsed laser beam weld processes. The GTA weld solidification was consistent with those predicted with existing solidification diagrams and the cracking response was controlled primarily by solidification mode. The solidification behavior of the pulsed laser welds was complex, and often contained regions of primary ferrite and primary austenite solidification, although in all cases the welds were found to be completely austenite at room temperature. Electron backscattered diffraction (EBSD) pattern analysis indicated that the nature of the base metal ... continued below

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37 p.

Creation Information

BROOKS,JOHN A.; ROBINO,CHARLES V.; HEADLEY,THOMAS J. & MICHAEL,JOSEPH R. July 24, 2000.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 266 times , with 13 in the last month . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The weld solidification and cracking behavior of sulfur bearing free machining austenitic stainless steel was investigated for both gas-tungsten arc (GTA) and pulsed laser beam weld processes. The GTA weld solidification was consistent with those predicted with existing solidification diagrams and the cracking response was controlled primarily by solidification mode. The solidification behavior of the pulsed laser welds was complex, and often contained regions of primary ferrite and primary austenite solidification, although in all cases the welds were found to be completely austenite at room temperature. Electron backscattered diffraction (EBSD) pattern analysis indicated that the nature of the base metal at the time of solidification plays a primary role in initial solidification. The solid state transformation of austenite to ferrite at the fusion zone boundary, and ferrite to austenite on cooling may both be massive in nature. A range of alloy compositions that exhibited good resistance to solidification cracking and was compatible with both welding processes was identified. The compositional range is bounded by laser weldability at lower Cr{sub eq}/Ni{sub eq} ratios and by the GTA weldability at higher ratios. It was found with both processes that the limiting ratios were somewhat dependent upon sulfur content.

Physical Description

37 p.

Notes

OSTI as DE00759979

Medium: P; Size: 37 pages

Source

  • Journal Name: Welding Journal Research Supplement; Other Information: Submitted to Welding Journal Research Supplement

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  • Report No.: SAND2000-1800J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 759979
  • Archival Resource Key: ark:/67531/metadc705805

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

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Creation Date

  • July 24, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:23 p.m.

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BROOKS,JOHN A.; ROBINO,CHARLES V.; HEADLEY,THOMAS J. & MICHAEL,JOSEPH R. Welding Behavior of Free Machining Stainless Steel, article, July 24, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc705805/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.