The Master’s thesis discusses welding of a glow plug heater according to the TIG procedure and with a laser, since the scrap increased with the start of welding at the automated production line. A large fraction of the waste is due to welding problems.
The first part of the thesis provides an overview of literature about welding procedures, used for welding of the glow plug heater, and about main defects in materials because of welding. We then describe welding materials, their characteristics and usability. This is followed by the experimental part about welding two different heaters and by the analysis, with the helo of which we will try to decrease the scrap or optimise the welding at the automated production line.
Through experiments and analysis we reduced the scrap of heater A from 4,5 % to 1,6 %. Measuring the heaters' hardness showed a proper quality of the welds. Despite the high quality of the welds the results of the electrical characteristics of heater B were not satisfactory.