The removal of weld metal and base metal from the other side of a partially welded joint to assure complete penetration upon subsequent welding from that side.
glossary
glossary
The momentary recession of the flame into the welding or cutting tip followed by reappearance or complete extinction of the flame.
A welding technique where the welding torch or gun is directed opposite to the direction of welding.
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 shielding gas used on the underside of a weld bead to protect it from atmospheric contamination.