automatic arc welding machine
submerged arc automatic welding
two-head automatic arc welding machine
semiautomatic arc welder
thyristor AC arc welder
automatic change and automatic recovery device
AC arc welding power source∥Pulsed arc stabilizer
gas metal arc welding-pulsed arc
Plasma arc ∥ Plasma arc by a microcomputer aided photo processing
twin arc submerged arc welding
097 Electrical Controlled Automatic Transmission