a2 eco automatic double head welding machine automatic double head welding machine lisi a2 eco with variable angle 45-180 complete with frame support holders and head protections. bead limiting knives from 0,2 to 2 mm. re......a2 eco automatic double head welding machine automatic double head welding machine lisi a2 eco with variable angle 45-180 complete with frame support holders and head protections. bead limiting knives from 0,2 to 2 mm. removable heated cutters with automatic regulation of the temperature by digital thermoregulator. possibility to modificate the material burn-out from 5 to 6 mm by the simply replacement of the positioner. high safety low pressure clampings controlled by a pressure switch. automatic control of the welding plates temperature by digital thermoregulators and automatic control of the fusion time by single timers.