L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Jean-Pierre Schultz

Francis Cuny

Daniel Nicoud

Eric Verna

Jean Soler

Jean-Marie Tritz

Daniel Payraudeau

Gas mixture suitable for MAG welding at a high current using a rod filled with non-alloyed or low alloy steels, comprises 20 to 65% argon, 5 to 20% helium, and at least 30% CO.sub.2.

Gas mixture and welding method

To terminate welding, the mean energy of the arc is first reduced to obtain plugging of the hole, then this energy is briefly increased before again being decreased. Application to plasma arc welding of carbon steels.

Process for terminating closed through-hole plasma arc welding

An arc welding process and apparatus utilising an electrode and a counter-electrode between which a column of plasma forms. A first unidirectional current source is located between the electrode and the counter-electrode, and a second unidirectional current source is located between the counter-electrode and the member to be welded. These two sources simultaneously pass the two unidirectional currents.

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Meulan, France

Jean-Pierre Schultz