The paper presents operational problems present in fluid and gas flow
measurement systems. Tests (involving laser welded tubes made using a focused
and a defocused beam) were concerned with the quality of welded joints.
The tests revealed that the use of the focused beam resulted in the formation of
cracks in the welds. In addition, post-weld observations revealed undercuts on
the weld face side, responsible for the thinning of the tubes, yet without compromising
their service life.

10.17729/ebis.2020.2/7