Cryogenic Treatment of Welding Contact Tips for Lower Wear
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Solution Overview
Problem
Contact elements in arc welding machines experience significant wear due to current loading and abrasive friction, leading to frequent replacements and increased production costs, especially when coated to reduce wear.
Innovation Solution
Subjecting contact elements to a cold treatment process involving cooling to below -50°C, preferably using cryogenic media like nitrogen, and maintaining this temperature for a holding phase before gradual heating to prevent corrosion, thereby enhancing wear resistance without the need for additional coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact elements are coated to reduce mechanical wear, then wear resistance is improved, but production costs increase considerably
Solution Approach 1:
The invention applies cold treatment to change the physical parameters of the contact element material, specifically increasing hardness and modifying surface properties through low-temperature exposure. This transforms the material's inherent characteristics to achieve wear resistance without requiring additional coating materials or complex coating processes, thereby resolving the contradiction between improved reliability and reduced manufacturing cost
2Duration of action of stationary object
If contact elements are subjected to cold treatment, then abrasive wear is reduced and service life is extended, but additional processing steps are required
Solution Approach 1:
The cold treatment is applied as a preliminary action during the manufacturing process, before the contact element is put into service. By performing the wear-resistant treatment in advance during production rather than requiring maintenance interventions during operation, the service life is extended without adding operational complexity. The treatment becomes part of the initial manufacturing workflow
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cold treatment significantly reduces abrasive wear in contact elements, extending their service life and maintaining low electrical resistance, making them suitable for continuous use in welding applications without additional coatings.
Implementation Method 1
the contact elements are subjected to a cold treatment, during which they are cooled down to a lower target temperature of below minus 50° C., preferably below minus 100° C.
Implementation Method 2
The cooling in this case generally takes place by direct or indirect contact with a cryogenic medium, for example cold gaseous or liquefied nitrogen
Implementation Method 3
after their production and before their intended use for current contacting of a consumable wire electrode in a welding apparatus, the contact elements are subjected to a cold treatment
Data Source
AI summary
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.