integra 4h the line, incorporating a horizontal corner welding machine (fusion 4h ) and a corner cleaning machine (trimmer 2a), provides an efficient combination of the two welding and cleaning processes which are made fu......integra 4h the line, incorporating a horizontal corner welding machine (fusion 4h ) and a corner cleaning machine (trimmer 2a), provides an efficient combination of the two welding and cleaning processes which are made fully automatic thanks to their integration. fusion 4h cnc 4-head horizontal corner welding machine in which all cycle variables (times, speeds, etc.) can be programmed and preset automatically in the machine. cooling bench this bench allows interconnection between fusion 4h and trimmer 2a. trimmer 2a pvc right-angle corner cleaning machine of innovative design, features 2 interpolated axes, with optimized automatic cycle, able to recognize the current profile automatically.