Esab Ab

Hannes Hugo Raudsepp

Tomas Johansson

Martin Andersson

Rikard Ljungkvist

Vesa Kiiskinen

Bo Jansson

Ulf Nicklas Andrén

Pierre Magnus Robert Svedlund

A method includes monitoring a submerged arc welding (SAW) operation in real-time; determining, based on the monitoring and in real-time, a discrepancy between a desired weld parameter and an actual weld parameter of a weld resulting from the SAW operation; and in response to determining the discrepancy, controlling a power supply, which provides power for the SAW operation, to modify at least one of balance or offset of an alternating current (AC) welding power signal supplied for the SAW operation to compensate for the discrepancy.

Balance and offset in adaptive submerged arc welding

Stopping electroslag strip cladding operations feeding multiple strips includes detecting, during a welding phase of an electroslag welding operation feeding a first strip and a second strip towards a molten slag pool formed on a work piece, initiation of a stop phase. Upon detection the feeding of the first strip towards the molten slag pool is stopped. Additionally, a feed direction of the feeding of the second strip is reversed to retract the second strip away from the molten slag pool.

Stopping an electroslag welding process

A method comprising an arc ignition phase (IP), an arc-stabilizing phase (AP) and a stable arc phase (SP). The arc stabilizing phase comprises an initial sub-phase (IS) comprising the step of feeding at least one hot wire () at constant feed speed and a main sub-phase (MS) comprising the steps of feeding said hot wire at constant feed speed and feeding at least one cold wire () at constant feed speed. The stable arc phase comprises the steps of continuously adjusting the feed speed of the hot wire and continuously adjusting the feed speed of the cold wire. The invention also relates to a welding apparatus () for carrying out the method. The welding apparatus comprises a hot wire feeding means (), a contact means (), a cold wire feeding means () and a control unit (). The control unit is adapted to control said hot wire feeding means to feed the hot wire at a constant feed speed during the initial sub-phase, feed the hot wire at a constant feed speed during the main sub-phase and to continuously during the stable arc phase adjust the feed speed of the hot wire. The control unit is adapted to control said cold wire feeding means to feed the cold wire at a constant feed speed during the main sub-phase and continuously during the stable arc phase adjust the cold wire feed speed.

Method for starting a submerged arc welding process and welding apparatus

The present application relates to an arc welding arrangement and an electric arc welding method to be used with the arc welding arrangement. The arc welding arrangement comprising a first power source, a first electrode connected to say first power source, and a second electrode, said first electrode being adapted to generate a weld pool via a first electric arc present within a first arc region. The second electrode is operated at welding parameters adapted to ensure that excess energy from at least said first electrode is required to maintain said second arc ignited. The method comprises the step of feeding said second electrode so that it is allowed to consume excess energy from said first electrode to maintain said second arc ignited.

Arc welding method and arc welding arrangement with first and second electrodes

A submerged arc welding apparatus includes a first wire feeder feeding a first hot wire towards a work piece; a first contact tube transferring current to the first hot wire for arc generation to create a weld puddle; a second wire feeder feeding a cold wire at a variable feed speed towards the weld puddle; one or more sensors configured to continuously measure, during a welding phase, at least a first active welding parameter related to at least the first hot wire; and a control unit. The control unit is configured to determine different target values for the variable feed speed of the cold wire based on different values of the at least a first active welding parameter such that a different target value for the variable feed speed of the cold wire is determined according to a different value of the at least a first active welding parameter.

Method and system for submerged arc welding

An arc electric welding head comprising a first contact device housing a first duct for feeding a first electrode and providing electrical contact between a first power source and said first electrode, a second contact device housing a second duct for feeding a second electrode and providing electrical contact between a second power source and said second electrode, said first and second contact devices being electrically insulated from each other, said first and second ducts being parallel.

Tandem arc welding head and a welding arrangement for overlapping arcs to a cold wire electrode

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.

Contact nozzle with split tip

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.

Self-adjusting twin contact jaws

The present application relates to an electric arc welding method to be used with an arc welding arrangement () comprising a first power source, a first electrode () connected to said first power source, and a second electrode (), said first electrode () being adapted to generate a weld pool () via a first electric arc present within a first arc region () and said second electrode () being adapted to generate said weld pool via a second electric arc present within a second arc region. The first electrode () is operated at welding parameters adapted to maintain said first arc ignited. The second electrode () is operated at welding parameters adapted to ensure that excess energy from at least said first electrode () is required to maintain said second arc ignited. The method comprises the step of feeding said second electrode () so that it is allowed to consume excess energy from said first electrode () to maintain said second arc ignited. The invention also relates to an arc welding arrangement () for carrying out the method.

A contact tip () for gas metal-arc welding comprising:

Contact tip for use in gas metal-arc welding

The invention relates to a method for submerged arc welding comprising the steps of guiding a first hot wire () towards a work piece and guiding a cold wire () at a variable feed speed. The method further comprises the steps of continuously measuring, during a welding phase, at least a first active welding parameter related to at least said first hot wire () adjusting the cold wire () feed speed in dependence on at least first active welding parameter variations, to maintain high welding stability and high weld quality. The invention also relates to a system () for carrying out the method. The system () comprises hot wire feeding means () for feeding a first hot wire () towards a work piece and cold wire feeding means () for feeding a cold wire () at a variable cold wire () feed speed and a control unit () for controlling the second wire feeding means (). The system () also comprises measuring means () adapted to continuously measure at least a first active welding parameter related to said first hot wire (). The control unit () determines target values for the cold wire () feed speed, each target value corresponding to a first active welding parameter value and controls said second wire feeding means () to adjust said cold wire () feed speed to said target values.

A contact fitting for a welding apparatus includes a housing, and first contact device, a second contact device, and a third contact device arranged between the first and second contact devices. The third contact device is movable relative to the first and second contact devices. The first contact device has an elongated form, is fixedly arranged in the housing, and extends from a first end, which is arranged between first and second ends of the housing, to a second end. The second contact device has an elongated form, is suspended spring-loaded to the housing, and extends from a first end, which is arranged between the first and second ends of the housing, to a second end.

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Täby, Sweden

Hannes Hugo Raudsepp