Hot wire GTAW welding is a further development of the Gas Tungsten Arc Welding or Tungsten Inert Gas process. In hot wire welding, filler wire is resistance heated until close to the melting point and added to the weld puddle behind the tungsten. This prevents the wire from chilling the weld pool and allows the filler metal to flow out across the weld puddle resulting in a smooth, attractive weld bead. Since nearly all of the full energy of the welding arc is available for penetration or to generate the weld pool and fusion, a two to three times faster travel speed is realized.