Process for welding one or more metal workpieces to be joined together by producing at least one welded joint between the edges to be welded of the said metal workpiece or workpieces, the said welded joint being obtained by using at least one laser beam and at least one electric arc, in which process, during welding of the joint, at least one part of the welding zone comprising at least one part of said welded joint is shielded during the operation with at least one shielding atmosphere formed by a gas mixture consisting of argon and/or helium with a content greater than or equal to 70% by volume; and at least one additional compound chosen from H 2 , O 2 , CO 2 and N 2 with a content of 0 to 30% by volume.

Laser/arc hybrid welding process with appropriate gas mixture

Metal deposition rate is increased with reduced energy input in pulsed arc welding with a consumable electrode and a shielding gas mixture of argon, helium and carbon dioxide, the helium content being in the range from about 16% to about 25% and the carbon dioxide content being from about 1% to 4%. The component gases are stored in separate containers until the welding operation during which precisely metered flows of each are entrained by a metering valve and directed to the weld region. Consistently finished welds are produced, on stainless steel, low alloy steels and nickel based alloys as well as other weldable ferrous metals, including during out of position welding operations.

Pulsed arc welding method, apparatus and shielding gas composition

A welding method and shielding gas therefor which enables the use of gas metal arc welding to produce smooth welds with little or no surface oxidation and without encountering arc instability during the metal deposition.

Gas metal arc welding and shielding gas therefor

A shielding gas for flux cored arc welding. The specific gas combination is intended to promote significantly lower fume emission levels while providing equivalent or better welding performance.

Shielding Gases for Arc Welding

This invention discloses a novel shielding gas mixture for use in gas shielded arc welding processes. The shielding gas of this invention may be used in a wide variety of processes when welding various superalloy compositions. In the broad range, the composition contains, in percent by volume, 5 to 12 helium, 0.1 to 0.9 carbon dioxide and the balance argon. The typical composition contains about 10 helium, about 0.25 to 0.55 carbon dioxide and the balance argon plus impurities.

Shielding gas mixture for welding superalloys

A gas metal arc welding process employing a shielding gas mixture consisting essentially of (A) 2 to 12 volume percent carbon dioxide, (B) 20 to 45 volume percent helium and (C) the balance argon.

Constant arc voltage gas metal arc welding process

The gas metal arc welding process of the present invention extends the axial spray metal transfer range with a non rotating arc from 10 to 25 Ibs/hr using an electrode wire diameter between .035 to .052 inches. The process is carried out by maintaining an electrode extension of between 3/4 to 1 1/4 inches with a three component shielding gas mixture consisting essentially of argon and oxygen in combination with carbon dioxide or carbon monoxide in a volume proportion of oxygen 1-2%, carbon dioxide 8-15%, balance argon. The arc voltage is maintained in a range of between 29 and 40 volts.

Kevin Arthur Lyttle

Papers

Constant arc voltage gas metal arc welding process

Gas metal arc welding process