IIW 2014 Annual Report

ANNUAL REPORT 2014 18

COMMISSION IX: BEHAVIOUR OF METALS SUBJECTED TO WELDING Sub-Commissions and Working Groups: C-IX-C: Creep and Heat-resistant Welds Chair: Prof. Dr.-Ing. Peter Mayr (Germany) C-IX-H: Weldability of Stainless Steels, Nickel-based Alloys and Heat-resisting Steels Chair: Dr. María-Asunción Valiente Bermejo (Spain) C-IX-L: Low Alloyed Steel Welds Chair: Assoc. Prof. Dipl.-Ing. Dr. techn Norbert Enzinger (Austria)

C-IX-NF: Weldability of Non-ferrous Materials Chair: Prof. Dr.-Ing. Jorge dos Santos (Germany) Vice-Chair: Dr. Carl E Cross (United States) C-IX-WG1 Mathematical Modelling of Weld Phenomena Chair: Prof. Christoph Sommitsch (Austria)

Chair: Prof. Madeleine Du Toit Australia

The focus of Commission IX encompasses the various types of metals behaviour subjected to welding and the resulting influence on the integrity of welded joints and components during service. Strategically, weldability and the service integrity of joined components are regarded as interactions of the material with the introduced loading and the specific design. The scientific and technological work in Commission IX is focused on metallic materials, i.e. is based on the metallurgy of welded joints, covering their microstructure, properties and performance. Special emphasis is given to the occurrence and avoidance of imperfections, damages

and failures during welding production and manufacturing, as well as during service of welded joints and components. These particularly include hot and cold cracking, high and low temperature, as well as aqueous and gaseous corrosion of welds, creep and fatigue. The Working Unit has four Sub-Commissions, focussing on the various steel types, CRAs and on non-ferrous metals, all having a respective working programme. Due to the large variety of metals and their interactions with the design and welding processes, the Commission collaborates with all other Commissions oriented towards welding processes or structural design.

COMMISSION X: STRUCTURAL PERFORMANCES OF WELDED JOINTS - FRACTURE AVOIDANCE Sub-Commissions and Working Groups: C-X-A: Welding residual stresses in thick steel structures Chair: Prof. Jeong-Ung Park (R.O. Korea)

Commission X aims to establish a practical procedure for assessing the strength and integrity of welded structures in design as well as in service with known or assumed flaws, where attention is paid to the role and influence of welding residual stresses, strength mismatch between base and weld metals, and heterogeneity in toughness of welds. Recent activity has focusedon thedevelopment of a practical guideline for Fitness-for-Service (FFS) assessment for welded components

containing a flaw and damage, which includes stress/ strain-based assessment, constraint analysis and toughness testing procedure for welds. With further development of FFS for welds, Commission X faces the challenge of advanced design of transport vehicles and infrastructures such as energy plants, pipelines, bridges and buildings constructed with high performance steels and high welding technologies.

Chair: Prof. Dr.-Eng. Fumiyoshi Minami Japan