Abstract
The paper presents the technology for welding of heat-treated steel on the example of S690QL steel. Part of the research work shows all relevant parameters and assumptions necessary for the implementation of the welded joint. In addition, part of the research included the results of studies that were conducted on specially prepared specimens. For comparison two butt welds with a thickness of 12 mm and 50 mm and a fillet weld thickness of 40 mm are presented. The scope of research includes the non-destructive testing such as visual test, penetration test, ultrasonic test, radiographic test and destructive tests, which include: tensile test, bending test, impact test, macro test and measurement of hardness.
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