769-3154 and 769-3145: Heavy maintenance work including electronic motors with high temperature alloys, large metal boxes and joining busbars
769-3148: Mainly used with higher temperature alloys on commutators, soldering cans, boxes, transformer casings, heat exchangers and radiators
769-3139 and 769-3141: General soldering on transformer casings, soldering on commutators up to 2in dia, tin plate and metal box fabrications