IIW 2016 Annual Report

TECHNICAL HIGHLIGHTS 2016

C II Activities during 2015/16 were focused on fun- damental scientific and practical investigations of microstructural effects in respect to cold cracking, hot cracking, mechanical behaviour and pore formation sensitivity caused by filler metals used for ultra-high-strength steels, creep resis- tant steels, high-alloyed steels and nickel-based alloys. Also the welding behaviour and mechani- cal properties of wire arc-based additive manu- factured duplex stainless steel filler metals were characterised and arc welding was evaluated in terms of an economic approach for Additive Ma- nufacturing of larger metallic parts. Furthermore Round Robins on chemical analysis of tramp ele- ments and fluxes for submerged arc welding were finished and prepared for publication. As another pillar of C-II, standardisation activities in the field of filler metals were periodically monitored and discussed. Based on serious technical findings of the Member Societies in respect to the determi- nation of diffusible hydrogen, it was also decided to take up work on a revision of ISO 3690 Welding and allied processes -- Determination of hydrogen content in arc weld metal. C V Many strong technical projects have been under- taken in 2016, including the following highlights: publication of ISO 18211 on guided wave testing of above ground pipelines; publication of a model-as- sisted probability of detection document; publica- tion of digital reference radiographs through the Google Store; formation of an IIW working group that is focusing on the advanced phased array technique FMC/TFM; and preparation of a booklet of papers on structural health monitoring. C-V has also been active in organising joint seminars with other IIW Commissions to collaborate in areas of importance. At the Melbourne Annual Assembly in 2016 there was a joint session with C- XVI on inno- vation in Polymer Joining and NDT, and there will be a joint session with C-I at the Shanghai Assem- bly in 2017 on Additive Manufacturing.

C VI The Commission is engaged with ISO/TC 44 SC 7 Representation of terms to produce numerous parts of ISO Technical Report 25901 Welding and allied processes - Vocabulary that includes terms and definitions covering specific welding topics. The primary aim of this activity is to have a single repository of terms and definitions for those who use welding and allied processes. In 2016, work was completed on Part 1: General terms, Part 3: Welding processes, and Part 4: Arc welding, and these were published by ISO. During the year work progressed on Part 2: Safety and health and on Part 10: Laser welding. A joint meeting was held with C-VIII Health and Safety to discuss Part 2, and several experts from C-IV joined C-VI for a discussion on laser welding. Other topics for future discussion include electron beam wel- ding, thermal cutting, and plastics welding. C X The development of a Fitness For Service (FFS) procedure, which will operate as a supplement to the existing Standards/Guideline for fracture assessment of weld components, is in progress in C-X. Specific subjects to be included in the FFS procedure are: • K-solutions for welded joints; • limit load of weld joints (3D assessment inclu- ding mismatch effect); • residual stress profiles for thick weld compo- nents (WG-A); • constraint correction for welded joints (stren- gth mismatch and residual stress effects); • pre-strain/dynamic loading effects; • fracture toughness testing of welds (including shallow notch specimen); and, • strain-based assessment (Strain-based FAD). A working group will provide a compendium of welding residual stress profiles in thick steel

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ANNUAL REPORT 2016 IIW