Industrial welding jaws with built-in cut-off knife suitable for the production and sealing of foil bags. The maximum weld length is 600, 800, 1000 or 1400 mm depending on the modification. The machine is characterized by high safety of the operator - the knife comes out only after pressing the upper jaw to the lower one. The cutting of the foil is done about 10 mm behind the weld. The machines are equipped with a foot control, the jaw holding is mechanical as standard (version F) or pneumatic (version PN) at an additional cost. These welding machines are also equipped with a thermistor (thermal protection of the transformer). The models with a weld width of up to 1400 mm are suitable for the production of palletising bags. These devices are characterized by low operating costs and minimal maintenance requirements. This model is designed for welds up to 1400 mm and is equipped with mechanical tipping and jaw holding.