EFFECTS OF NITROGEN AND TITANIUM ON POROSITY AND MICROSTRUCTURE IN Ar-N//2 GAS METAL ARC WELDED COPPER.

Takeshi Kuwana, Hiroyuki Kokawa, Akira Honda

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Pure copper plates were welded with pure copper and Cu-Ti alloy electrode wires using Ar-N//2 gas shieldings. The effects of welding conditions, nitrogen percentage in the shielding gas and titanium content of the electrode wire on porosity and microstructure of the weld metal were systematically examined. When pure copper electrode wire is used, a high welding current leads to good surface appearance and deep penetration, but high porosity in the weld metal. The porosity of weld metal increases with N//2% in the shielding gas. This tendency becomes very weak when the electrode contains titanium. The nitrogen content of weld metal increases with N//2% in the shielding gas. This tendency becomes more remarkable with an increase in titanium content of electrode wire. When the electrode wire contains titanium and the shielding gas contains nitrogen, a secondary phase emerges in the weld metal. The fractional area of the secondary phase in the weld metal increases with N//2% in the shielding gas and titanium content of the electrode wire. The electron diffraction patterns of the secondary phase are in good agreement with those of TiN. The temperature of molten copper pool during arc welding was measured, and the formation of TiN was discussed with thermodynamic data.

Original languageEnglish
Pages (from-to)69-76
Number of pages8
JournalTransactions of the Japan Welding Society
Volume18
Issue number2
Publication statusPublished - 1987 Oct 1

ASJC Scopus subject areas

  • Engineering(all)

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