Nitrogen absorption into pure iron weld metal under welding atmosphere of high pressure —nitrogen absorption into weld metal under welding atmosphere of high pressure (part 1)—

Takeshi Kuwana, Hiroyuki Kokawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Pure iron was welded in N2 and N2-Ar atmospheres at 1~30 atm pressures. Effects of welding conditions and the nitrogen partial pressure on the nitrogen content of pure iron weld metal were systematically studied. The results are summarized as follows: (1) In the nitrogen welding atmosphere, the nitrogen content of weld metal decreased with increasing the welding current, with decreasing the arc voltage and with decreasing the travel speed. (2) In the nitrogen welding atmosphere, the nitrogen content of weld metal increased with the nitrogen pressure, but the degree of the increase became slight with increasing the nitrogen pressure. The nitrogen absorption of weld metal does not obey the Sieverts' law. (3) In N2-Ar welding atmosphere, the nitrogen content of weld metal was lower in high atmospheric pressure than in low atmospheric pressure at the same nitrogen partial pressure. (4) Using thermodynamic data obtained by equilibrium study, the nitrogen absorption into the weld metal in the nitrogen atmosphere of high pressure was discussed. The reaction time in welding process is so short that the nitrogen content of weld metal can not reach the equilibrium value in higher atmospheric pressure. (5) All iron weld metals had porosity.

Original languageEnglish
Pages (from-to)737-744
Number of pages8
Journalquarterly journal of the japan welding society
Volume3
Issue number4
DOIs
Publication statusPublished - 1985 Jan 1

Keywords

  • Bead Shape
  • Chemical Reaction
  • High Pressure
  • Iron Weld Metal
  • Nitrogen Absorption
  • Nitrogen Atmosphere
  • Solubility of Nitrogen
  • Wire Melting Rate

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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