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An arc welding process that produces coalescence of metals by heating them with a bare metal electrode. the arc is maintained with a blanket of granulated flux. A consumable filler wire is employed and the arc is maintained between this wire and the parent plate. Around the arc the granulated flux breaks down and provides some gases and a highly protective thermally insulating molten container for the arc. This allows a high concentration of heat, making the process very efficient and suitable for heavy deposits at fast speeds. After welding the molten metal is protected by a layer of fused flux which together with the unfused flux may be recovered before cooling.

The process is basically only intended for down hand applications and where it is used for single pass welding of any size it is essential to use some form of the backing bar because of the comparatively large weld pool obtained. Here the backing bar may be of copper and waste cooled or a flux trough may be provided to form the underbead.

Related Terms

RESTRICTOR

A device for producing a deliberate pressure drop or resistance in a line by reducing the cross-sectional flow area.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

ABRASION RESISTANCE

The ability of a material to resist surface wear.

CONTAMINANT CAPACITY

The weight of a specified artificial contaminant that must be added to the influent to produce a given differential pressure across a filter at specified conditions. Used as an indication of relative service life. Also known as Dirt capacity, Dust capacity

DIELECTRIC STRENGTH

A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

FILTER ELEMENT

The porous device that performs the actual process of filtration. Also known as Cartridge

HYDROFINISHING

A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

ACID ATTACK

Caused by an incomplete flushing after an acid cleaning process of boilers or similar equipment.
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