Stud Welding Surface Cleaning for Thin Aluminum Sheets
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Solution Overview
Problem
Existing stud welding methods face challenges in efficiently cleaning very thin workpieces, particularly aluminum, which can lead to 'root penetration' and prevent reliable joining due to contamination and the emission of electrons during the cleaning process.
Innovation Solution
A dedicated cleaning electrode is used to generate a cleaning arc on the workpiece surface, allowing for efficient surface cleaning without changing polarity, and the fastening element is pre-cleaned to ensure a reliable stud welding process, especially for thin aluminum sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent polarity changes are conducted during cleaning process, then cleaning effectiveness is improved, but root penetration occurs in thin-walled workpieces
Solution Approach 1:
The cleaning process is segmented into multiple cleaning arcs with different polarity configurations. Instead of frequent polarity changes on the same electrode, the patent uses a first cleaning arc with one polarity arrangement and a second cleaning arc with a different polarity arrangement, allowing thorough cleaning without excessive heating of thin workpieces.
Solution Approach 2:
The patent introduces a second cleaning arc as an intermediary cleaning method. This second cleaning arc with different polarity serves as an alternative to frequent polarity changes, providing effective cleaning while controlling heat input to prevent root penetration in thin-walled workpieces.
2Reliability
If cleaning arc with lower current intensity is used, then contamination removal is achieved, but cleaning time increases
Solution Approach 1:
The cleaning process uses periodic action by alternating between a first cleaning arc and a second cleaning arc with different polarities. This periodic switching between two cleaning modes maintains effective contamination removal while controlling overall process time, as each arc type complements the other in removing different types of contaminants.
Solution Approach 2:
The patent changes parameters by using two different cleaning arcs with different current intensities and polarity arrangements. The first cleaning arc operates at one set of parameters while the second cleaning arc operates at different parameters, optimizing both cleaning effectiveness and process efficiency without excessive cleaning time.
3Manufacturing precision
If dedicated cleaning electrode is introduced, then cleaning precision is improved, but device complexity increases
Solution Approach 1:
The welding device is designed with multi-functionality by incorporating both welding functionality and dual cleaning arc functionality. The first and second cleaning arcs are integrated into the existing welding device structure, allowing the same apparatus to perform welding and cleaning operations without requiring completely separate dedicated cleaning equipment.
Solution Approach 2:
The welding device performs its own cleaning function through the integrated first and second cleaning arcs. Instead of requiring external dedicated cleaning equipment, the welding device cleans its own contact surfaces and electrodes, reducing overall system complexity while maintaining cleaning precision.
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
This method effectively prevents root penetration and ensures reliable stud welding on thin aluminum sheets by using a cleaning electrode to clean the workpiece surface without changing polarity, allowing for optimized joining without the need for additional costly cleaning processes.
Implementation Method 1
generating a cleaning arc between the cleaning electrode and the joining surface of the workpiece
Implementation Method 2
the component with negative polarity experiences a certain cleaning temperature rise which results in the combustion of the wetting substances
Implementation Method 3
the component with negative polarity experiences a certain cleaning temperature rise which results in the combustion of the wetting substances
Implementation Method 4
generating a welding arc between the fastening element and the workpiece
Data Source
Figure 1
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Figure 8
AI summary
Method for joining fastening elements (12) such as studs on workpieces (14) such as metal sheets, said method having the steps of preparing a joining surface (18) of a fastening element (12) and/or a joining surface (22) of a workpiece (14) and of bringing the fastening element (12) and the workpiece (14) together in such a manner that the fastening element (12) is connected to the workpiece (14), wherein prior to the preparing step a cleaning step is carried out in order to clean the joining surface of the workpiece. Consequently, the cleaning step includes arranging a cleaning electrode (62) above the joining surface (22) of the workpiece and generating a cleaning arc (74) between the cleaning electrode (62) and the joining surface (22).