The Telwin Welding Machine TECHNOMIG 150 DUAL SYNERGIC Description: Polarity change for GAS MIG-MAG/BRAZING Welding Machine; Synergic adjustment with setting only of the material thickness; Fine adjustment of the arc length; 10 synergy curves available; Compact and light; Thermostatic, overvoltage, undervoltage, overcurrent,motorgenerator protectionst.