IIW IWI-S case studies
IIW IWI-S · Put your knowledge to work in context.
The IIW International Welding Inspector - Standard (IWI-S) is an entry-level personnel certification in the International Institute of Welding's inspector qualification framework. It is aimed at people who verify welded fabrication against drawings, welding procedure specifications and applicable standards: welding coordinators moving into inspection, fabrication and QC staff, third-party surveyors, and engineers who need a recognised inspection competence. The IIW IWI-S case studies are 5 cases and about 2,684 words.
1Flux-cored consumable substitution on impact-tested plate girders
A shop is fabricating 24 m plate girders in S355J2+N, with 25 mm flanges and 12 mm webs. The qualified WPS uses a gas-shielded rutile flux-cored wire classified ISO 17632-A T 46 2 P C 1 H5, 1.2 mm, with CO2 at 15 L/min, 240 A, 26 V and 1.4 kJ/mm.
638 words, about 3 min2Toe cracking in a restrained S690QL support
An S690QL support structure, 40 mm thick, is welded in a shop at 8 °C ambient. The qualified WPS requires preheat 150 °C, heat input 1.5–2.0 kJ/mm, interpass 200 °C maximum and hydrogen-controlled consumables.
553 words, about 3 min3Fatigue upgrade of a crane runway bracket
An existing crane runway girder has a bracket connected by two 8 mm fillet welds, each 200 mm long, giving a throat of about 5.6 mm. The bracket carries a fluctuating load of 20–120 kN for 2×10^6 cycles.
455 words, about 2 min4Porosity and root lack of fusion in a 5083 aluminium tank
An 8 mm 5083-H111 aluminium tank is welded by MIG with 5356 filler, argon 99.99% at 20 L/min, 180 A, 22 V, 45 cm/min and no preheat. The shop is at 12 °C with 85% relative humidity.
493 words, about 2 min5Unqualified nozzle weld and premature radiography before hydrotest
A fabricator is finishing a 16 mm SA-516-70 pressure vessel. The dossier contains a PQR on 10 mm plate, GTAW root plus SMAW fill, impact tested at -20 °C, and welder W-12 qualified in 3G on a 10 mm coupon with backing.
545 words, about 3 min