Auto ring making machine ZGTEK "Cage welding machines" is used to make filter bag cages, which used in dust collector (baghouse) ... provides leading technologies in filter bag cage welding industry, from a stand alone machine to a whole automated line, ... machine, 2) ring making machine. 3) air-operated butt welding machine, 4) top cap welder, 5) bottom cap welder, 6) wire straightening machine, 2.Type ...