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AssigneeMesser Group GmbH
InventorsThomas Böckler, Bernd Hildebrandt, Georg Selders, Mario Rockser, Dirk Kampffmeyer
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When welding with a consumable wire electrode, current contacting occurs when the electrode wire passes by a readily electrically conductive contact element. In order to improve the current contacting and reduce the wear of the contact element in particular, the invention proposes subjecting contact elements to a cold treatment prior to using same. The cold treatment has a cooling phase during which the temperature of the contact element is reduced to a lower target temperature, a subsequent holding phase in which the contact element is substantially held at the target temperature, and a final heating phase, in which the contact element is brought to an upper target temperature. The use of contact elements treated using the method according to the invention leads to a substantial increase of the wear resistance compared to untreated contact elements.
A method for improving current contacting when arc welding using a current-carrying wire electrode by means of an apparatus for arc welding in which, to pick up current, the wire electrode is passed through a contact element connected to a power source, in which method, before its intended use, the contact element is subjected to a cold treatment, in which the contact element is cooled down to a lower target temperature of below minus 50° C. in a cooling phase and is subsequently heated up to an upper target temperature in a heating phase.
Dependencies are inferred from the claim text.