TIG-keevitus, kus lisametallina kasutatakse pidevalt etteantavat ja läbiva vooluga kuumutatavat keevitustraati (vt TIG-keevitus; vrd TIG-külmtraatkeevitus), an advancement to the conventional TIG welding (gas tungsten arc welding, GTAW) process in which pre-heated wire is introduced instead of a normal cold wire (see: gas tungsten arc welding/TIG welding; compare: cold-wire GTAW/cold-wire TIG welding