A recent TWI project involving fatigue tests of girth welded pipes included comprehensive post-test examination of the welds with particular attention to the geometry in the weld root region where fatigue cracking initiated. (W 16) (1)

Weld root = Raiz da solda

..Procedures were developed that produced welds with a smooth, mitre-shaped fillet, with a laser root extending from the fillet…(W 189) (2)

Laser root = Raiz do laser

A bespoke inspection programme developed by TWI has enabled replication of an inspection conducted by a wind turbine manufacturer and subsequent detection of flaws within the aluminium ring of the blade root. (Welding 514) (3)

Blade root = Raiz da lâmina

(1) Estimating long-endurance fatigue strength of girth-welded pipes using local stress approach

Yanhui Zhang and Steve J Maddox 

TWI Ltd, Granta Park, Great Abington, Cambridge CB21 6AL, UK

Paper presented at Proceedings 33rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2014) June 8-13, 2014, San Francisco, USA.

(2) Laser and hybrid laser-MAG welding of steel structures for shipbuilding

Steve Shi and David Howse

Laser & Sheet Processes Group, TWI Ltd

Paper presented at 2007 International Forum on Welding Technologies in Shipping Industry held in Shanghai on 16-18 June 2007.

(3) Phased array ultrasonics inspection of wind turbine aluminium blade roots

Case Study

www.twi-global.com/…/phased-array-ultrasonics-inspection-of-wind-turbine-aluminium-blade-roots-518/ – 2014-05-06.