Laser welding of electrical contacts

V industriji se vedno bolj razvijajo različne tehnike spajanja bakrovih zlitin. Ena izmed teh je tudi lasersko varjenje. Zaključna naloga temelji na ugotovitvi, ali je lasersko varjenje primerna metoda za spajanje bakrenih površin in ali lahko nadomesti dosedanjo metodo spajanja s spajkanjem. V delu bo obravnavano lasersko varjenje bakrenih površin rotorja elektromotorja, ki je bilo izvedeno z uporabo vlakenskega laserja. Dobljeni so bili najprimernejši varilni parametri laserskega stroja, izvedena je bila vizualna kontrola zvarnih spojev ter kontrola globine prevaritve. Dosežena globina prevaritve pri prvi kombinaciji varilnih parametrov je bila 481 μm, pri drugi pa 368 µm. Varilni parametri laserja pri prvi kombinaciji so bili: maksimalna moč pulza: 6 kW, čas trajanja pulza: 6 ms, frekvenca pulzov: 10 Hz , pri drugi pa: maksimalna moč pulza: 5 kW, čas trajanja pulza: 10 ms, frekvenca pulzov: 10 Hz.In the industry, various techniques for joining copper alloys are increasingly being developed, and one of these is laser welding. This thesis is based on determining whether laser welding is a suitable method for joining copper surfaces and whether it can replace the existing soldering method. The thesis focuses on laser welding of copper surfaces in the rotor of an electric motor, which was performed using a fiber laser. The optimal welding parameters for the laser machine were obtained, and both visual inspection of the weld joints and depth of penetration control were conducted. The achieved penetration depth for the first combination of welding parameters was 481 µm, and for the second combination, it was 368 µm. The laser welding parameters for the first combination were: maximum pulse power: 6 kW, pulse duration: 6 ms, pulse frequency: 10 Hz. For the second combination: maximum pulse power: 5 kW, pulse duration: 10 ms, pulse frequency: 10 Hz