Abstract: A bipolar flexible water-cooled cable includes a positive conductor and one or more return conductors. The positive conductor extends along the longitudinal axis of the cable and is placed in an insulating sheath so that a gap is provided between the positive conductor and insulating sheath for passage of a cooling agent. Return conductors are wound on the insulating sheath at an angle .alpha., equal to 15.degree. to 82.degree., to the longitudinal axis of the cable. The positive and return conductors are placed in a hose of an insulating material. The diameter D.sub.0 of the return conductor and the diameter D.sub.1 of the positive conductor are determined by the relationship ##EQU1## where n is the number of return conductors. The cable is intended primarily to be used in welding to connect a power transformer with a portable welding gun.

Abstract: An end piece of a bipolar water-cooled cable comprises two parts rigidly secured together via a sealing insulation gasket. The first part features sockets for connection of current-carrying conductors of one polarity, an opening for connection to a cooling water source, communicating with spaces of the cable cooling system, and a recess. The second part has an insert extending beyond the butt of said part, which can fit into the recess via an insulation gasket and is intended to connect current-carrying conductors of the opposite polarity. The portion of the insert protruding beyond the butt thereof is cylindrical in shape, extends to a length not less than 2.5 diameters thereof and features a blind hole which is the socket whereto the current-carrying conductors of the opposite polarity are connected. A sleeve of an insulating material is rigidly secured on the insert so that it extends beyond the butt of the insert.