IIW IWS case studies
IIW IWS · Put your knowledge to work in context.
The International Welding Specialist (IWS) is an IIW personnel qualification for people who coordinate welding work rather than primarily strike arcs themselves: production planners, workshop supervisors, quality and inspection staff, and engineers moving into welding coordination. It sits below the International Welding Technologist and Engineer in the IIW qualification structure, with a more practical, execution-focused syllabus. The IIW IWS case studies are 5 cases and about 3,581 words.
1SAW seam porosity and arc instability after consumable change
An IWS supervises submerged arc welding of a 12 m longitudinal seam in 25 mm S355J2 plate for a 1.8 m diameter vessel. The qualified WPS uses 4.0 mm wire, DC electrode positive, 700 A, 30 V, 500 mm/min, agglomerated flux and a ceramic backing on the root.
714 words, about 4 min2Duplex 2205 cap ferrite, interpass temperature and pitting corrosion
2205 duplex stainless steel pipe spools, 16 mm wall, are being welded for a coastal water system. The WPS specifies GTAW root with ER2209 and argon shielding, SMAW fill with E2209-16, heat input 1.0-1.5 kJ/mm and interpass maximum 150 C.
725 words, about 4 min3Fatigue crack at a crane runway bracket weld
A 12 mm thick S355J2 bracket is fillet-welded with an 8 mm leg to the top flange of a crane runway beam. The bracket carries a reversing load of 60-120 kN, about 2 x 10^6 cycles over 14 months.
743 words, about 4 min4Radiography acceptance followed by planar indications in a thick nozzle weld
A 50 mm thick C-Mn steel nozzle-to-shell weld in a pressure vessel was radiographed with an Ir-192 source using a single-wall technique. The film showed no unacceptable indications and the weld was accepted.
671 words, about 3 min5Stainless spool production under deadline, qualification and purge constraints
A shop has to fabricate 40 m of 8 inch, schedule 10, 304L stainless steel pipe spools in five working days. The scope is 12 spools, GTAW root with argon purge and GMAW fill, 100% radiography, and pickling/passivation.
728 words, about 4 min