In modern times there is an increase in use of newer manufacturing technologies with which products are being produced from artificial polymer materials. As a consequence more and more products manufactured with additive technologies are on the market. In the thesis we researched compatibilities of such products with more conventional technologies of material joining, like plastic welding. We tested the quality of welded joints, made of two polymer material parts, produced with the 3D printing process fused deposition modeling. The thesis is divided into three main parts; firstly different pieces were made from polycarbonate material, in the second part those pieces were welded by plastic welding with resistive implants and in the last part welded joints were destructively tested on a test station. The station was designed to enable the application of gravity force to joints. Measurements were divided by the direction of the applied force according to the joint position; transverse and longitudinal. Results show, that the joints which were collapsed by the transverse force, hold greater static load (average force was 290 N) than the ones with the longitudinal force load (average force of those was 280 N). Repeatability was better, when the static load was applied to joints in transverse direction.
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