glossary

Mode of metal transfer across the arc where a molten ball larger than the electrode diameter forms at the tip of the electrode. On detachment, it takes on an irregular shape and tumbles towards the weld puddle sometimes shorting between the electrode and work at irregular intervals. Occurs when using shielding gases other than those consisting of at least 80% argon and at medium current settings

In GMAW/Spray Transfer, the value at which the electrode metal transfer changes from globular to spray mode as welding current increases for any given electrode diameter.

The condition between rubbing surfaces where high spots or protrusions on a surface become friction welded to the mating surface, resulting in spalling and further deterioration.

Shielding gas atoms that, in the presence of an electrical current, lose one or more electrons and therefore, carry a positive electrical charge. The provide a more electrically conductive path for the arc between the electrode and the work piece.

An arc welding process wherein coalescence is produced by heating with an arc between a continuous filler metal (consumable) electrode and the work. Shielding is obtained entirely from an externally supplied gas, or gas mixture. Some methods of this process are called MIG (Metal Inert Gas) or CO2 welding. MIG welding requires the use of an inert shield gas.