Keywords: Welding; Welded joints; Joints; Examination (quality assurance); Non-destructive testing ; Metals; Quality control; Thickness; Acceptance inspection; Acceptance (approval); Defects ; Steels; Aluminium; Copper; Nickel; Titanium; Nickel alloys; Copper alloys; Technical documents; Selection; Sampling methods; Visual inspection (testing); Penetrant flaw detection; Eddy-current tests; Magnetic-particle flaw detection; Radiographic testing; Ultrasonic testing; Classification systems