INNER MANDREL OF TUBE WELDING MILL Russian patent published in 1996 - IPC

FIELD: tube welding; production of medium and large diameter straight-seamed tubes of final length. SUBSTANCE: inner mandrel has copper shoes 4 and 5 with independent height adjustment mechanisms automatically (electrically) coupled with edge gap pickup 8 and shoe pressure pickup 9 through control devices. Aligned tube blank is delivered by chain pusher into inner mandrel of welding stand where welding of processing seam is done on shoe 4 and welding of outer seam is done on shoe 5. In welding of processing seam, pickup 8 measures gap between edges of tube blank and either lifts or lowers copper shoes by electric ties by means of shoe position adjuster depending on value of butt opening. Pickup 8, in process of outer seam welding, defines value of shoe pressure acting onto shoe position adjuster by means of electric ties, and thus sets required pressure. EFFECT: enlarged operating capabilities. 3 cl, 1 dwg