A contact device for a welding apparatus is disclosed. The contact device for feeding current to at least a first welding wire and a second welding wire. The contact device including first and second contact jaws. The first and second contact jaws including a slot formed therein to provide the first and second contact jaws with improved flexibility to individually and independently flex about the first and second welding wires to ensure proper contact is maintained between the contact jaws and the welding wire.

A contact device for feeding current to one or more welding wires in a welding apparatus includes a split tip nozzle having first and second diametrically opposed slots formed therein and a biasing means for supplying an adjustable biasing force to first and second split tips to bias the first and second split tips together to ensure that a desired contact between the split tip nozzle and the one or more welding wires is maintained throughout the lifecycle of the nozzle. The biasing force may be applied by any means including, for example, a compression ring, interaction of tapered surfaces between the tube and the split tip nozzle, a compression or cylinder spring pre-mounted on the first and second split tips, a tensioning screw, etc.

A one-side submerged arc welding method, includes joining two steel plates butted against each other by submerged arc welding from one side using a plurality of electrode. During the submerged arc welding, at least one of electrode distances between adjacent electrodes in an end part region of the steel plates is reduced to be smaller than the at least one of electrode distances in a region in front of the end part region. In reducing the at least one of electrode distances, an increasing section of change rate from when a change of the at least one of electrode distances starts to when the change rate of the at least one of electrode distances reaches its maximum has a time of 2 seconds or more.

A system and method are provided for using a welding or cutting system that uses a physical key to lock or unlock welding parameters or operations. The key can be used to lock, unlock, store and track welding or cutting information and can be customized as needed.

A system and method are provided for using a welding or cutting system that uses a physical key to lock or unlock welding parameters or operations. The key can be used to lock, unlock, store and track welding or cutting information and can be customized as needed.

An austenitic-ferritic stainless steel welding material, comprising in weight %: C: <0.02 Si: <0.45 Mn: 1.60-2.05 P: <0.03 S: <0.03 Cr: 18.5-25 Ni: 8.5-10.5 Mo: <0.75 10 Co: <0.2 Cu: <0.75 N: 0.12-0.3 the balance being Fe and incidental impurities.

An austenitic-ferritic stainless steel welding material, comprising in weight %: C: <0.02 Si: <0.45 Mn: 1.60-2.05 P: <0.03 S: <0.03 Cr: 18.5-25 Ni: 8.5-10.5 Mo: <0.75 10 Co: <0.2 Cu: <0.75 N: 0.12-0.3 the balance being Fe and incidental impurities.

Described is a welding assembly (104) designed to be positioned in line between first rollers (101) and second rollers (103) of a plant (100) for the welding of steel beams with an H profile starting from a first flange (6), a web (7) and a second flange (8) to be welded together, characterised in that it is designed to rotate about itself by 180 about a relative vertical axis, in such a way as to receive the web (7), the first flange (6) and/or the second flange (8), both when coming from the first rollers (101) and when coming from the second rollers (103). The invention also relates to a relative plant (100) for the welding and a method for its operation.

A system and method of welding or additive manufacturing is provided where at least two welding electrodes are provided to and passed through a two separate orifices on a single contact tip and a welding waveform is provided to the electrodes through the contact tip to weld simultaneously with both electrodes, where a bridge droplet is formed between the electrodes and then transferred to the puddle.

A system and method of welding or additive manufacturing is provided where at least two welding electrodes are provided to and passed through a two separate orifices on a single contact tip and a welding waveform is provided to the electrodes through the contact tip to weld simultaneously with both electrodes, where a bridge droplet is formed between the electrodes and then transferred to the puddle.