Nitrogen desorption by high-nitrogen steel weld metal during CO 2 laser welding

Wei Dong, Hiroyuki Kokawa, Susumu Tsukamoto, Yutaka S. Sato

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Nitrogen desorption by high-nitrogen steels (HNSs) containing 0.32 and 0. 53 pct nitrogen during CO2 laser welding in an Ar-N2 gas mixture was investigated and the obtained data were compared with those for arc welding and at the equilibrium state predicted by Sieverts' Law. Although the nitrogen content in the weld metal during CO2 laser welding was lower than that in the as-received base material in all conditions, the nitrogen desorption was larger in the top part of the weld metal than in the keyhole region. The nitrogen desorption in the Ar atmosphere was less during CO2 laser welding than during arc welding. With the increase in nitrogen partial pressure, the nitrogen content in the weld metal sharply increased during arc welding, but only slightly increased during CO2 laser welding. The nitrogen absorption and desorption of the HNS weld metal were much smaller during CO2 laser welding than during arc welding.

Original languageEnglish
Pages (from-to)677-681
Number of pages5
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume36
Issue number5
DOIs
Publication statusPublished - 2005 Oct

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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