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 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

A universal shielding gas mixture contains, by volume, about 96.0% argon, 3.0% carbon dioxide, and 1.0% oxygen. This single shielding gas composition can be used for welding ferrous metals, including both carbon steel and stainless steel using a variety of gas metal arc welding (GMAW) processes including short circuit arc, pulse arc, spray arc, metal transfer modes and flux core metal arc welding (FCAW) when welding carbon steel, stainless steel, hardfacing and metal core wires. This universal shielding gas composition will not substantially alter the carbon content of the weld metal chemistry. In a second embodiment, suitable for use with carbon steel materials but not stainless steel, the shielding gas mixture contains, by volume, about 95.0% argon, 3.0% carbon dioxide, and 2.0% oxygen. Another aspect of the invention is a single tank containing the premixed universal shielding gas, and improved gas metal arc welding processes that utilize the disclosed shielding gas mixture.

Universal shielding gas for GMAW and FCAW welding and process

A spray mode gas metal arc welding process employing a shielding gas mixture consisting essentially of (A) 3 to 8 volume percent carbon dioxide, (B) 30 to 40 volume percent argon and (C) the balance helium

Spray mode 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.

Devito Joseph

Papers

Gas metal arc welding process