Electric heating – Metal heating – By arc
Patent
1980-11-14
1983-08-23
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PK, 219121PY, 219 61, 219 74, 219 72, B23K 916
Patent
active
044006110
ABSTRACT:
When metal inert gas (MIG) welding is carried out at normal atmospheric pressure, the electrode is made positive with respect to the workpiece because the use of a negative electrode gives little penetration. In undersea welding, as the pressure increases the arc stability and metal transfer in MIG welding become erratic and there is copious fume evolution. According to the present invention, MIG welding at pressures greater than 7 bars is carried out with the electrode negative with respect to the workpiece and with an electrode wire of diameter not greater than 1.4 mm; the slope of the power supply, as seen from the welding arc, is preferably between 6 and 15 V/100 A, which is higher than the 3 to 4 V/100 A used in positive-electrode MIG welding at normal atmospheric pressure.
REFERENCES:
patent: 3969603 (1976-07-01), Boughton et al.
patent: 4035602 (1977-07-01), Berghof
patent: 4052632 (1977-10-01), Sagara et al.
patent: 4154999 (1979-05-01), Pinfold et al.
"Semiautomatic Underwater Welding", Dr. of Technical Sciences, Shliamin et al., U.S.S.R., Underwater Digest.
Welding Handbook, pp. 3.39, 3.40, 6th edition, Section 1.
Novack Martin
Paschall M. H.
The Welding Institute
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