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Robotic welding case of linear fluid motor produced from high-strength steel
Hejduk, Stanislav ; Slováček, Marek (referee) ; Sigmund, Marian (advisor)
The theses deals with the welding of high-strength steels S690 QL using the MAG method. The aim of the work was to conduct a feasibility study for welding VP steels. Welding took place in a robotic workplace. Welding parameters were calculated, and subsequently, a pWPS was created based on these parameters, according to which a test sample was welded. The welding was performed without preheating or post-weld heat treatment. The welded samples were then evaluated using non-destructive and destructive testing. No unacceptable surface defects were detected through non-destructive testing. Destructive testing verified the size of the heat-affected zone (HAZ), with the most significant influence observed in the cover layer, and a value of 2.5 mm was determined. The hardness test according to Vickers also yielded successful results, with the highest measured value being 377 HV0.2. The tensile test resulted in failure within the HAZ, but the mechanical properties were comparable to the base material. Therefore, the weld on the test sample was evaluated as successful.
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