Arc Welding of Mild Steel in Pressurized Ar-O2 Atmosphere

Kuwana Takeshi, Kokawa Hiroyuki, Kiguchi Ryuji

Research output: Contribution to journalArticlepeer-review

Abstract

A Mild steel was welded in pressurized Ar-O2 gas mixture atmospheres up to 2.0 MPa, using a 1.6 mm diameter solid wire. The effects of ambient gas pressure and gas composition on the arc welding phenomena and mechanical properties of weld metal were studied. The main results are as follows : The fluctuations of arc voltage and welding current are small and the arc stability is fairly good. The fluctuations of arc voltage and welding current are small and the arc stability is fairly good. The weld metals obtained in this experiments have no defects such as under-cutting, overlapping, blow holes. The Vickers hardness and tensile properties of weld metals were varied with the ambient gas composition, but did not depend on the ambient gas pressure. The Charpy V-notch toughness of weld metal was changed markedly with O2 partial pressure in atmosphere and showed a maximum at 0.02 - 0.05 MPa oxygen partial pressure which resulted in about 0.03 mass% oxygen content of weld metal having a fine ferrite structure. This suggests that toughness is strongly influenced by the oxygen content of weld metal.

Original languageEnglish
Pages (from-to)300-306
Number of pages7
Journalquarterly journal of the japan welding society
Volume11
Issue number2
DOIs
Publication statusPublished - 1993 Apr

Keywords

  • Arc welding
  • Chemical composition
  • Hardness
  • Hyperbaric welding
  • Mechanical properties
  • Oxygen content
  • Pressurized Ar-O atmosphere
  • Tensile properties
  • Toughness
  • Underwater welding
  • Weld metal

ASJC Scopus subject areas

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

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