METHOD AND APPARATUS FOR FORMING TUBE OF METALLIC BAND WITH USE OF MECHANISM FOR ARRESTING AND RESTARTING Russian patent published in 1999 - IPC

FIELD: continuous production of metallic tube or metallic sheathe of cable from metallic band. SUBSTANCE: welding unit, rollers for closing up seam edges and seam guide are secured to base plate which is joined with supporting unit by sliding joint. Base plate slowly moves between its initial starting position and final working position which is slightly lower than starting one. Base plate returns upwards to starting position when apparatus is arrested for servicing or for filling up metallic band. In the result at restarting apparatus and at moving it to working position continuous flaw-free welded seam is formed. EFFECT: flaw-free welded seam at arresting and restarting of apparatus. 7 dwg