Abstract: A machine for welding screens formed of spaced longitudinal screen wires welded at a welding station to spaced transverse tie rods, the machine having at the welding station a ram clamping both the screen wires and a tie rod against movement during welding and rearward of the welding station a transfer clamp assembly shiftable longitudinally of the screen wires for feeding the screen wires in predetermined increments to the welding station, the screen wires in a welding operation being clamped by both the ram and the transfer assembly against movement during welding and by one or the other against relative movement at other times.