device for welding of rohrschuessen and subsequent co produce two additional parallel to the rohrschuessen schweissnaehte

摘要

An apparatus for joining and cladding pipe sections has a cradle which holds two cylindrical pipe sections with their ends abutting axially and their axes coaxially horizontally aligned. A carriage is displaceable axially adjacent the cradle and carries a primary welding tool which can weld the ends of the pipe sections together as they are rotated in the cradle. Metal strip can be pulled of a supply of strip on the carriage, bent into a U-section, arced, and helically applied to the pipe sections as they rotate. Meanwhile a second welding tool on the carriage welds the arced U-section strip to the pipe sections as they rotate to form a helical passage therealong.