A second problem concerns the damaging effect of stress ranges below the constant amplitude fatigue limit. (W 341) (1)

Damaging effect = Efeito prejudicial

The heating effect of the ultrasound varies with the degree of crystallinity of the material being welded. (W 383) (2)

Heating effect = Efeito por aquecimento

The hydrogen effect is sensitive to any stress concentration. (W 94) (3)

Hydrogen effect = Efeito por hidrogênio

(1) Review of fatigue assessment procedures for welded aluminium structures

S J Maddox, TWI Ltd

Paper published in International Journal of Fatigue, Paper JIJF1005. vol. 25, no. 12, December 2003, pp.1359-1378 -available here.

(2) Welding technologies for polymers and composites

A L Buxton 

Polymer Technology Group, TWI Ltd

Paper presented at the I Mech E seminar, ‘The Joining of Plastics and Polymer Composite Materials’, held on 24 October 2002 at TWI and published in The Joining of Plastics and Polymer Composite Materials.

(3) Review of the effect of hydrogen gas on fatigue performance of steels

Yan Hui Zhang 

Structural Integrity Technology Group

TWI Ltd

Granta Park, Great Abington, Cambridge CB21 6AL, United Kingdom.

Paper presented at 29th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2010), Shanghai, China, 6-11 June 2010.