TraceWeld is the most modern control system of fusion welding and it is available in all
the POLYS P-4 welders. Each type of this welder has a slightly different control means.
As an example we would demonstrate the P-4a, since this type of control is the most popular one. The set of welding temperature and of the pipe size is very simple just by turning the control wheel and the rest is done by the electronics. The patented TraceWeld system allows even less experienced operators to make perfect welds.

The P4a welder allows for the precise setting of the temperature from 180 to 280 degrees C. The temperature setting is executed by the blue setting wheel 1. The operator must use a tool such as a screw driver or a small coin to be able to adjust the welding temperature setting.
The outer red ring 2 is used to set the pipe size. After the temperature and the pipe size were set, the welder is turned on by plugging it
to the power outlet. The correct operation of the welder is indicated by
the lit red diode 3 and also by the green LED 4 for the temperature. When the green diode starts flashing , the welder is ready to start
the welding process. Just before pressing the pipe ends to the welder attachments, the operator shall push the button Timer 5. The welding process is indicated as follows: