Some Characteristics of the Electrode Melting Phenomena in Narrow Gap Arc Welding (Rept.-II) : Effect of Shielding Gas Composition

概要

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Effect of the shielding gas composition on the relationship between the groove width and both wire meling rates and characteristics of welding arcs have been studied in DCSP and DCRP using 1.6 mm dia steel electrode wire (shielding gas composition; 100 % Ar, 80 % Ar+20 % C0_2, 30 % Ar+70 % C0_2, 100 % C0_2). In DCSP (electrode negative) with the shieldin.g gas content of C0_2 or C0_2+Ar, the wire meling rate decreased as the groove became narrower. The groove width from which the above-mentioned phenomena appeared moved toward narrow gap side as the amount of C0_2 or welding current increased. In 100 % Ar shielding gas, the wire melting rate and behavior of arc were little affected by the groove width. On the other hand, in DCRP (electrode positive), the wire melting rate did not vary with the groove width when the shielding gas was composed of Ar only or Ar+C0_2. The results are discussed in terms of a change in the width of arc burning area at wire end.
社団法人溶接学会の論文
1981-10-01