... process including clamping and alignment of web and flange,automatic tack-welding is controlled with PLC.main machine is driven by A.C ... ,stable and reliable,Upper press-beam is guided thru left and right four rails,ensuring steady clamping of long time useMODEL WEB ... 200-2500MM 35MM 180-800MM 80MM 4000-15000 11.7KW H-BEAM automatic assembling machine