A railway-rail induction welding device (10) which comprises a copper tubular body (14) having a cooling-fluid inlet and a cooling-fluid outlet. The copper tubular body has a rail-facing rail-heating portion (18) and a cooling-fluid return portion (20). The rail-facing rail-heating portion (18) has a longitudinal extent which is non-linear and profiled to correspond or substantially correspond to one side of a railway rail to be treated. A lateral extent of the rail-facing rail-heating portion (18) is non-uniform along the said longitudinal extent.
B23K 13/01 - Welding by high-frequency current heating by induction heating
B23K 37/04 - Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
E01B 29/46 - Devices for holding, positioning, or urging together the rail ends
The present application relates to a method and an apparatus for in a high frequency welding (HFW) or electrical resistance welding (ERW) line to perform in-line seam heat treatment of an established welded joint on a pipe (1) made from roll- formed plate material, the welded joint being heated inductively from the exterior side of the pipe (1) downstream of a welding location. The method provides for selective heating (7) of the welded joint from the interior of the pipe (1) downstream of the welding location at least one heating zone, such heating from the interior, when operative, being performed simultaneously and in addition to the external heating (4, 5, 6). The apparatus comprises in addition to exterior heating means (4, 5, 6) downstream of a welding location also induction heating means (7) located inside the pipe (1) for selective operation to heat the welded joint from the interior of the pipe (1) downstream of the welding location at least one heating zone, said operation when selected being additional and simultaneous with operation of the external heating means (4, 5, 6).
The invention relates to aspects of electric welding of aluminium or aluminium alloy in a magnetic field, wherein the aluminium or aluminium alloy (21; 22) adjacent to a weld joint (18) under formation has an oxide layer (21 '; 22'), and wherein the free end (1 ') of a welding wire (1) is supplied with a surrounding shielding gas. An alternating current, for example selected in the range of 500 Hz - 500 kHz is used as welding current. Furthermore, a welding wire is used that essentially consists of aluminium or aluminium alloy provided with an oxide-inhibiting coating (23'), for example of copper, which forms the outer covering or sheath of the welding wire and/or that as said shielding gas there is used a shielding gas with oxygen incorporated therein, or that the shielding gas is supplied with oxygen during the welding process. The volume amount of oxygen in relation to the shielding gas is in the range of 0.1-5%. When the welding process is carried out in a magnetic field, the minimum frequency of the welding current is selected as a function of the strength of the magnetic field. The invention also indicates a method of producing the welding wire and necessary material conditions for a usable welding gun.
B23K 35/02 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
B23K 35/08 - Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape specially designed for use as electrodes of non-circular cross-sectionRods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape specially designed for use as electrodes with special arrangement, e.g. internal multi-coredRods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape specially designed for use as electrodes of non-circular cross-sectionRods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape specially designed for use as electrodes with special arrangement, e.g. internal multiple
B23K 9/29 - Supporting devices adapted for making use of shielding means
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