This microcontroller-driven, single-hand operation welding units with automatic temperature compensation by welding time are made for joints of PE and PP wastewater pipes for the conveyance of non-pressurized fluids. The units ensure audible and visual, on the screen, welding process monitoring. Their maximum compact dimensions and light weight, along with the long power supply and welding cables, bring an extra-large operating radius to the welders and make them your ideal choice for working joints at spots that are extremely difficult to reach.