Resistance spot welding of copper is a big challenge in practice, because copper is one of the best electrical and heat conductors. These characteristics have a bad influence on heat generation in welding zone. In applications where a tube wants to be sealed, there is a plastic deformation present. This can cause cracks in material on spots, where the most deformation is applied. The thesis focuses on analyzing the challenges of closing and sealing the tube, where air intrusion must not occur during or after the welding process. The parameters were determined using Design of experiment methodology. This method allows a deeper understanding of the process with minimum number of trials. The tightness of the welds was checked experimentally and heat pipes were made and tested. All parameters for successful use of the technology in these aplication were established. The proces, with established parameters, has 95% successfulnes.
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