NITROGEN ABSORPTION OF IRON WELD METAL IN PRESSURIZED WELDING ATMOSPHERES.

Takeshi Kuwana, Hiroyuki Kokawa, Shin ichi Matsuzaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A purified iron was pressurized N//2 and N//2-Ar atmospheres of 0. 1 to about 3 MPa. In N//2 welding atmosphere, the nitrogen content of the weld metal decreases with an increase in welding current and a decrease in arc voltage and travel speed. The nitrogen content increases with nitrogen pressure, but the degree of increase diminishes with an increase in nitrogen pressure. The nitrogen absorption does not obey Sieverts' law. In N//2-Ar welding atmosphere when nitrogen partial pressure is constant, the nitrogen content of weld metal in high pressure welding atmosphere is smaller than that in low pressure atmosphere. A discussion on nitrogen absorption with thermodynamic data suggests that the reaction time in welding is too short for the nitrogen content to reach the equilibrium value in high pressure atmosphere.

Original languageEnglish
Pages (from-to)12-18
Number of pages7
JournalTransactions of the Japan Welding Society
Volume18
Issue number1
Publication statusPublished - 1987 Apr 1

ASJC Scopus subject areas

  • Engineering(all)

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