When welding with hot air, we need different shapes of welding nozzles to bring the appropriate amount of energy to the welding site in the allotted time. For many welding cases, there are already variously designed standard nozzles, but we can also design, optimize and manufacture them ourselves. The nozzles are usually made out of stainless steel or titanium alloy. With various nozzle shapes, it is necessary to know the flow of hot air and the temperature conditions on the nozzle in order to control the welding process. For this purpose, using existing nozzle, we experimentally measured temperatures at different points at the outlet and on the nozzle wall, at a given flow and temperature of hot air. We used measured data to create simulations. In the selected software environment, we created a model of existing nozzle and made an appropriate simulation. We performed an analysis where we compared different nozzle shapes and dimensions, different nozzle bending angles, and nozzle material. Based on the obtained results of the cross-sectional temperature distribution, we found that the best distribution is obtained with a tapered, elongated nozzle with an addition element, which enables even welding of the entire height of the weld.
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