Backing in the form of a ring, generally used in the welding of pipe.
Welding Tech
A shielding gas used on the underside of a weld bead to protect it from atmospheric contamination.
A material (base metal, weld metal, or granular material) placed at the root of a weld joint for the purpose of supporting molten weld metal.
A welding technique where the welding torch or gun is directed opposite to the direction of welding.
The momentary recession of the flame into the welding or cutting tip followed by reappearance or complete extinction of the flame.