Visual testing (VT) of welded joints is the simplest, cheapest and one of the most efficient methods of welded joint inspection aimed to discover welding defects.
Visual tests are divided into:
- Direct visual testing, where there is an uninterrupted optical path between the operator’s eye and the surface inspected. The following instruments are used for the tests: rulers, gauges, measuring tapes, calipers, magnifiers, mirror sets, protractors.
- Indirect (remote) visual testing, where there is an interruption in the optical path between the operator’s eye and the surface inspected. Remote tests are conducted on objects unavailable for direct testing, with the use of a videoscope. Our Laboratory has an Olympus videoscope with a 3.5 m insertion tube.
Visual testing is performed in conformity with the following standards:
PN-EN 13018:2016-04 - Non-destructive testing - Visual testing - General principles
PN-EN 13927:2009 - Non-destructive testing - Visual testing - Equipment
PN-EN ISO 17637:2017-02 - Non-destructive testing of welds — Visual testing of fusion-welded joints
PN-EN ISO 17635:2017-02 - Non-destructive testing of welds — General rules for metallic materials
PN-EN ISO 5817:2014-05 - Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections
PN-EN ISO 6520-1:2009 - Welding and allied processes — Classification of geometric imperfections in metallic materials — Part 1: Fusion welding
