20.500.12556/RUL-164278 Impact of ultrasonic welding parameters on weldability and sustainability of solid copper wires with and without varnish This article contains an advanced analysis of the properties of solid wire electrical contacts produced by ultrasonic welding, both with and without varnish. The main disadvantage of ultrasonic welding of thin wires is the inability to achieve acceptable peel force and tensile strength, which is mainly due to the deformation and thinning of the wires. This study deals with ultrasonic welding using a ring of thin solid copper wires that minimises the deformation and thinning of the wires. The influence of welding parameters such as energy, pressure and amplitude were systematically analysed. Based on these parameters, the optimum welding programme and control method was determined to weld unvarnished and varnished wires. The investigations included electrical resistance tests, optical microscopy, micro-hardness measurements, peel tests and tensile tests, and the measurement of energy consumption. The results showed no significant differences in microstructure and hardness between varnished and unvarnished joints. Ultrasonic joints of varnished wires achieved lower electrical conductivity (by 38%), lower tensile strength (by 3%) and higher peel strength (by 7%), while the welding process was more sustainable in terms of energy (by 6.6%) and time consumption (without preprocessing). solid copper wires ultrasonic welding varnish joint strength electrical conductivity sustainability polne bakrene žice ultrazvočno varjenje lak trdnost spojev električna prevodnost trajnost true false true Angleški jezik Slovenski jezik Članek v reviji 2024-10-18 12:25:28 2024-10-18 12:25:35 2025-06-05 13:05:29 0000-00-00 00:00:00 2024 0 0 17 str. iss. 20, art. 5033 Vol. 17 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791 1996-1944 10.3390/ma17205033 212105475 Logar_..._Impact_of_Ultrasonic_Welding_Parameters_on_Weldability__....pdf Logar_..._Impact_of_Ultrasonic_Welding_Parameters_on_Weldability__....pdf 1 8E603452CAB282FAAF722747454DBF87 23ace1b64237b6ac0dfa052d01d44e47ddb2f9416b17988f286073582b3891c0 0ea918c9-8d3d-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=194576 https://www.mdpi.com/1996-1944/17/20/5033 1 0ea98557-8d3b-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=194573 Fakulteta za strojništvo Naravoslovnotehniška fakulteta 0 0 0