A welding assembly for permanent joining of a first tubular component with a second component along a two- or three-dimensional intersection curve, along which both components (1, 2) contact, comprising a securing assembly for detachably securely joining on a tubular end of the first component facing away from the intersection curve, a manipulator unit mounted indirectly or directly on the securing assembly such that it can pivot about a tube longitudinal axis assigned to the first component, said manipulator unit having a freely positionable manipulator end, and a welding tool attached to the freely positionable manipulator end, wherein the securing assembly comprises a clamping module (5.2) that can at least partially be introduced into the tubular end of the first component on the end side and in an axial manner, which clamping module is designed for detachably securely joining onto a tube inner wall assigned to the first tubular component, as well as a carrier ring module (5.1) which is rotatably attached to the clamping module (5.2), which axially extends beyond the tubular end of the first component in the joined state of the clamping module (5.2), and which is in operative connection with a servomotor for the rotary driving of the carrier ring module (5.1) about the tube longitudinal axis in such a way that the carrier ring module (5.1) is mounted such that it can rotate continuously about the tube longitudinal axis, and wherein at least one linear frame is attached to the carrier ring module (5.1), which frame is mounted such that it can be moved bidirectionally and parallel to the tube longitudinal axis by means of an actuator, wherein the manipulator unit is a 6-axis open kinematic chain in the form of a vertical articulated robot and is attached to one end of the frame, a supply module is provided to which at least one of the following components is attached: a control unit (46.1, 46.2), an electrical energy supply unit, at least one reservoir (47.1, 47.2) for the material relating to the welding process, comprising welding wire and process gas, the at least one component is connected to the welding tool via a connection line, the supply module is rotatably mounted for performing a rotational movement at the same time as the movement of the welding tool about the tube longitudinal axis, which permits infinite rotations of the welding tool about the tube longitudinal axis, characterised in that the supply module is connected in articulated manner so as to be freely positionable along at least one plane to a support structure that is constructed separately from the welding assembly. a control unit (46.1, 46.2), an electrical energy supply unit, at least one reservoir (47.1, 47.2) for the material relating to the welding process, comprising welding wire and process gas, the at least one component is connected to the welding tool via a connection line, the supply module is rotatably mounted for performing a rotational movement at the same time as the movement of the welding tool about the tube longitudinal axis, which permits infinite rotations of the welding tool about the tube longitudinal axis, characterised in that the supply module is connected in articulated manner so as to be freely positionable along at least one plane to a support structure that is constructed separately from the welding assembly.