Localised cooling can also be applied to an SENT specimen clamped and loaded vertically using a flow of liquid nitrogen vapour within some kind of insulation around the notch location. (W 1) (1)

Liquid nitrogen = Nitrogênio líquido

Hannerz [22] found little or no effect on HAZ toughness of increasing nitrogen from 60 to 130ppm. Mitchell et al [17] found increasing nitrogen from 80 to 170 ppm in multipass welds to also have little or no effect and this also mirrored the experience described by Lagneborg et al [19] for multipass welds. (W 427) (2)

Increasing nitrogen = Aumento de nitrogênio

In contrast to niobium, vanadium-microalloying is most effective with enhanced nitrogen levels, yet there is understandable concern with this, based on the established adverse effect of nitrogen on weld joint toughness in C:Mn andC:Mn:Nb steels. (W 427) (3)

Enhanced nitrogen = Nitrogênio reforçado

(1) Single Edge Notched Tension (SENT) Testing At Low Temperatures

Philippa L Moore and Andreea M Crintea 

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

Paper presented at Proceedings of the 2016 11th International Pipeline Conference IPC2016 September 26-30, 2016, Calgary, Alberta, Canada.

(2) The influence of vanadium-microalloying on the weldability of steels

P H M Hart

Paper presented at Vanadium 2001. Vanadium Application Technology. International Symposium, Beijing, China, 12-14 Oct 2001.

(3) The influence of vanadium-microalloying on the weldability of steels

P H M Hart

Paper presented at Vanadium 2001. Vanadium Application Technology. International Symposium, Beijing, China, 12-14 Oct 2001.