Patent ID: 8686316

Claim:
An automatic welding device of MIG/MAG type consisting of: at least one carriage; and at least one welding head held by the at least one carriage, the welding head including at least one torch guiding a consumable electrode wire along a parting plane between pipes to be welded, which brings current to an end of the consumable electrode wire in order to generate an electric arc and ensure melting of a filler metal, wherein the at least one welding head includes: a central welding torch centered in relation to the parting plane to ensure a penetration pass of the central welding torch along the parting plane; and at least two other tracking welding torches, which includes a first tracking welding torch and a second tracking welding torch, wherein the first tracking welding torch is positioned on a first side of the parting plane and the second tracking welding torch is positioned on a second side of the parting plane opposite the first side, and wherein the first tracking welding torch is offset from the second tracking welding torch such that the first tracking welding torch follows the central welding torch and the second one of the tracking welding torch follows the first tracking welding torch with respect to a moving direction of the welding head, to provide sequential layers of partially overlapping lateral passes.