Automatic chain coupling machine by flame BK/EF version. Soldering is done with weld material and is electronically controlled in all its parameters. The PLC controls and adjustable speed cycle and facilitates machine adjustment during toll changes, which are quick and simple thanks to adjustable, self-cetering passages and the rapid repositioning of the torch units, pusher and weld material. The machine comes complete with constant tension chain winder, stop sensors, which detect malfunction and machine base adjustable in height.