The final thesis presents the production process of the weld and non-destructive methods
used to control the quality of welds. Welding technology is prescribed according to the
type and properties of the base material and operational requirements. MAG welding is the
most used in the company. It is a highly productive welding method in which an active
shielding gas consisting of mixture of Ar and CO2 is used to protect the arc. The quality of
welds is checked in the intermediate control. This includes visual inspection, liquid
penetrant inspection, magnetic particle inspection and ultrasonic inspection. In ultrasonic
inspection we found that appropriate choice of the sound frequency and its angle are most
important for the proper analyses of measurement results. The difference between 2 and 4
MHz sound frequencies lies in the penetration of signal sent to the subject. Thus, for
indications at greater depth or with greater thickness of the base material a frequency 2
MHz is more appropriate. The angle of the sound sent into material depends on the
thickness of the material. Thus, we found that a 70 ° angle is more suitable for thinner
material thickness and 45 ° angle for thicker ones. For the quality of the final product, are
phases of intermediate control are essential, because only to this extent can we eliminate
errors on the product. Adequately corrected detected defects ensure a sufficiently long
service life. We found that the stages of intermediate control after welding are important
for the smooth running of the further production process and the quality of the final
product.
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