Abstract: The invention relates to a device for automatic under-water welding for making a welding joint (3) on a surface (2), of the type comprising a welding torch (20) including an electrode (21) surrounded by a protection envelope (23) that defines together with said electrode (21) an annular channel (24) connected to means for supplying a protection gas. The welding torch (20) is provided axially at the centre of a set (30) of two concentric envelopes (31, 32), one of which at least is capable of axial displacement and can be adjusted relative to said surface (2), said envelopes defining between them an annular gap (34) for injecting a flow for drying the welding area and keeping it away from the water.

Abstract: Since the mineral insulation (M) of the cable (C) is sensitive to moisture from which it is protected over the length of the cable by a sheath (G), the bared front length (8) of the cable core (A) is initially connected to a connection length (14) whose insulation (22) is constituted by an organic material which is insensitive to moisture. The prior connection zone is embedded in a block of resin (24) surrounded with its own sheath (26). The desired electrical connection is made to the other end (18) of said connection length inside a non-sealed box. The invention is applicable to transmitting signals even in the event of an accident to a nuclear reactor.