In the production process of automobile battery cores, many parts such as cover plates and housings require laser welding. If the welding quality is not good, bubbles, insufficient welding strength, etc. will fail, which will cause liquid leakage in the batteries. Major quality problems can also cause security risks.
In addition, the use of friction welding electrode welding position, the welding quality requirements are also very high, otherwise it will improve the welding after the annex force is not good, the risk of falling off, while the grease, cleaning agent residue resistance increases, thus affecting the electrical properties.
Therefore, the quality of the welding quality of the battery core is very high and it is not allowed to generate any air bubbles. The aluminum parts will be contaminated by various lubricants and coolants in the early stage of production, stamping, and cutting. If the cleaning line is not sufficiently cleaned, or if the cleaning fluid is not clean, there will be an increase in the failure of the welding area. risk.
At present, there is a new detection method that can detect the presence of contaminants in the welding position in a few seconds, quantify the cleanliness of the welding position, quickly determine whether the part can enter the next welding process, and on the other hand, collect and optimize the production through inspection. Process, improve welding yield.
The degree of contamination of the metal surface was quantified by means of a German SITA cleanness instrument. The unit of reading was RFU (relative total fluorescence, the larger the reading, the more serious the contamination). The actual measurement data at a well-known automobile power battery production plant is as follows:
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By measuring the cleanliness value before friction welding, it is significant to improve the yield of friction welding and optimize the process of improving friction welding.
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