An arc welding apparatus and corresponding method includes a torch, a non-consumable electrode and a consumable electrode both disposed within the torch, a wire feeder configured to feed the consumable electrode in a vicinity of the non-consumable electrode, a first power source and a second power source that provide independent current, respectively, to the non-consumable electrode and the consumable electrode, and a weld process controller to control outputs of the first power source and the second power source such that a concentrated arc is formed, as a heat source, between the non-consumable electrode and a workpiece, and an inter-electrode arc is formed between the consumable electrode and the non-consumable electrode to melt the consumable electrode. The approach is characterized by low heat input, low distortion, low spatter, and the relative high speed or high deposition of laser and laser-MIG hybrid and other forms of multi-wire/multi-electrode welding, cladding, and additive manufacturing.

An arc welding apparatus and corresponding method includes a torch, a non-consumable electrode and a consumable electrode both disposed within the torch, a wire feeder configured to feed the consumable electrode in a vicinity of the non-consumable electrode, a first power source and a second power source that provide independent current, respectively, to the non-consumable electrode and the consumable electrode, and a weld process controller to control outputs of the first power source and the second power source such that a concentrated arc is formed, as a heat source, between the non-consumable electrode and a workpiece, and an inter-electrode arc is formed between the consumable electrode and the non-consumable electrode to melt the consumable electrode. The approach is characterized by low heat input, low distortion, low spatter, and the relative high speed or high deposition of laser and laser-MIG hybrid and other forms of multi-wire/multi-electrode welding, cladding, and additive manufacturing.

A pressure welding method and a pressure welding device are provided. The pressure welding device includes a plastification device (7), an upsetting device (8) and component mountings (34,35,36,37), for the components (2,3,3′,4) to be welded together, and a machine frame (12). The pressure welding device (1) further includes a machine head (13,14) with a component mounting (34, 35) and an associated additional component mounting (36, 37) and the machine head (13) is moveably arranged on the machine frame (12). The pressure welding device includes a machining device (18), for the welding part (5,5′), which is associated with the machine head (13,14) or the additional component mountings (36, 37). An adjusting device (17) generates a relative movement between the machine head (13,14) and the associated additional component mounting (36,37) for machining the welding part (5,5′).

A pressure welding method and a pressure welding device are provided. The pressure welding device includes a plastification device (7), an upsetting device (8) and component mountings (34,35,36,37), for the components (2,3,3′,4) to be welded together, and a machine frame (12). The pressure welding device (1) further includes a machine head (13,14) with a component mounting (34, 35) and an associated additional component mounting (36, 37) and the machine head (13) is moveably arranged on the machine frame (12). The pressure welding device includes a machining device (18), for the welding part (5,5′), which is associated with the machine head (13,14) or the additional component mountings (36, 37). An adjusting device (17) generates a relative movement between the machine head (13,14) and the associated additional component mounting (36,37) for machining the welding part (5,5′).

A pressure welding method and a pressure welding device (1) includes a plasticizing unit (7), a compression unit (8), a machine head (13) that includes a spindle (54) and a component holder (34). The pressure welding device (1) further includes a spindle drive (56) and an actuation mechanism (41) that includes an actuation drive (65) for the component holder (34). The actuation drive (65) is placed between the spindle drive (56) and the spindle (54) within a drive train (57).

A pressure welding method and a pressure welding device (1) includes a plasticizing unit (7), a compression unit (8), a machine head (13) that includes a spindle (54) and a component holder (34). The pressure welding device (1) further includes a spindle drive (56) and an actuation mechanism (41) that includes an actuation drive (65) for the component holder (34). The actuation drive (65) is placed between the spindle drive (56) and the spindle (54) within a drive train (57).

A pressure welding method and a pressure welding device (1) are provided. The pressure welding device (1) includes a plastification device (7), an upsetting device (8) and component mountings (34,35,36,37) for the components (2,3,3′,4) to be welded together and a machine frame (12). The pressure welding device (1) further includes a plurality of machine heads (13,14), each having a component mount (34,35), which machine heads are movably arranged on the machine frame and are connected to respective upsetting drives (22). The machine heads (13,14) and respective upsetting drives (22) can be independently driven. An upsetting head or support head (27), which is preferably secured on the frame, is arranged between the machine heads (13,14).

A pressure welding method and a pressure welding device (1) are provided. The pressure welding device (1) includes a plastification device (7), an upsetting device (8) and component mountings (34,35,36,37) for the components (2,3,3′,4) to be welded together and a machine frame (12). The pressure welding device (1) further includes a plurality of machine heads (13,14), each having a component mount (34,35), which machine heads are movably arranged on the machine frame and are connected to respective upsetting drives (22). The machine heads (13,14) and respective upsetting drives (22) can be independently driven. An upsetting head or support head (27), which is preferably secured on the frame, is arranged between the machine heads (13,14).

A joint unit includes a first metal pipe, a second metal pipe, and a joint portion (a region including a joint interface at which the end faces of the first and second metal pipes are joined to each other. At the joint portion, an outer circumferential bead portion protruding toward the outer circumference side and an inner circumferential bead portion protruding toward the inner circumference side are formed. The difference between the width of the outer circumferential bead portion (the width L1 of a grinding portion and the width L2 of the inner circumferential bead portion in a direction from the first metal pipe toward the second metal pipe is equal to or smaller than 40% with respect to the average value of the width L1 of the outer circumferential bead portion and the width L2 of the inner circumferential bead portion.

A joint unit includes a first metal pipe, a second metal pipe, and a joint portion (a region including a joint interface at which the end faces of the first and second metal pipes are joined to each other. At the joint portion, an outer circumferential bead portion protruding toward the outer circumference side and an inner circumferential bead portion protruding toward the inner circumference side are formed. The difference between the width of the outer circumferential bead portion (the width L1 of a grinding portion and the width L2 of the inner circumferential bead portion in a direction from the first metal pipe toward the second metal pipe is equal to or smaller than 40% with respect to the average value of the width L1 of the outer circumferential bead portion and the width L2 of the inner circumferential bead portion.