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ROOT CRACK [5 records]

Record 1 2010-12-09

English

Subject field(s)
  • Welding and Soldering (Metals)
  • Nuclear Fission Reactors
DEF

A defect triggered in the root pass of a weld in the immediate neighbourhood of the contact zone, and which spreads radially between the grains when under stress in service.

OBS

[Delayed re-heat cracking] only occurs with certain materials such as 321 type stainless steel, as it is caused by hardening of the steel due to fine precipitations of titanium carbide inside the crystalline structure. The hardening causes the plastic deformation capacity to be transferred to the periphery of the grains. For this to happen, the following conditions have to be met : a high operating temperature([higher than] 475°C for 321 steel), a geometrical discontinuity at the weld root, strain hardening at the weld root showing significant shrinkage, heavy local load, which may be due to welding stresses, a defect in the weld root(e. g. a small shrinkage crack).

Key term(s)
  • delayed reheat cracking

French

Domaine(s)
  • Soudage (Métal)
  • Réacteurs nucléaires de fission

Spanish

Save record 1

Record 2 2004-05-17

English

Subject field(s)
  • Silviculture
DEF

... longitudinal cracks that occur in the bark and wood often extending several feet up and down and penetrating several inches into the trunks of affected trees.

CONT

The colder the temperature the wider the cracks may open. Sudden drops in temperature do not appear to increase the appearance or width of cracks when compared with slow temperature changes. Soil moisture levels do not appear to affect ’frost cracking’ of previously ’frost crack’ injured trees, while wrapping or painting(using a white latex paint) appear to reduce this problem. In addition, wrapping and painting reduce sunscald, a trunk injury which may lead to frost cracking in future years. ’Frost cracks’ start from old wounds resulting from trunk injury, branch stubs, basal sprouts or root death.

French

Domaine(s)
  • Sylviculture
DEF

Défaut du tronc d'un arbre dont l'écorce et le bois superficiel ont éclaté sous l'action du gel.

Spanish

Campo(s) temático(s)
  • Silvicultura
DEF

Hendedura o grieta profunda en el tronco de un árbol debida a las bajas temperaturas.

Save record 2

Record 3 2003-02-12

English

Subject field(s)
  • Helicopters (Military)
  • Aircraft Propulsion Systems
CONT

During manufacturing when the root end closures and the aft closure are installed, fill & fair material is applied to the joint of the closures to provide the contour finish. Overtime a crack will develop in the filler and paint of the closure joints in this area.

OBS

root end: The base of a blade which is engaged in the rotor.

French

Domaine(s)
  • Hélicoptères (Militaire)
  • Propulsion des aéronefs
CONT

[...] inspection spéciale des pales du rotor principal, [...] réparation de l'enveloppe de pied de pale et de l'enveloppe arrière des pales du rotor principale. [...] Effectuer une inspection visuelle détaillée de l'enveloppe de pied de pale et de l'enveloppe arrière [...] afin de déterminer l'état de celles-ci.

OBS

Une fissure de deux centimètres de longueur découverte lors d'une inspection de maintenance de routine a été retrouvée sur plusieurs [...] hélicoptères. Toutefois, des ingénieurs en aéronautique ont rapidement déterminé que la structure de la pale du rotor n'était pas fissurée, seulement l'élément en plastique recouvrant le pied de pale.

OBS

Le pied de pale est la partie terminale de la pale côté moyen.

Spanish

Save record 3

Record 4 2003-02-12

English

Subject field(s)
  • Helicopters (Military)
  • Aircraft Propulsion Systems
CONT

During manufacturing when the root end closures and the aft closure are installed, fill & fair material is applied to the joint of the closures to provide the contour finish. Overtime a crack will develop in the filler and paint of the closure joints in this area.

French

Domaine(s)
  • Hélicoptères (Militaire)
  • Propulsion des aéronefs
CONT

[...] inspection spéciale des pales du rotor principal, [...] réparation de l'enveloppe de pied de pale et de l'enveloppe arrière des pales du rotor principale. [...] Effectuer une inspection visuelle détaillée de l'enveloppe de pied de pale et de l'enveloppe arrière [...] afin de déterminer l'état de celles-ci.

Spanish

Save record 4

Record 5 1989-01-23

English

Subject field(s)
  • Welding and Soldering (Metals)
DEF

A crack in the weld or heat-affected zone occurring at the root of a weld.

French

Domaine(s)
  • Soudage (Métal)
OBS

Terme accepté par le Comité des lexiques des métiers (Nouveau-Brunswick).

Spanish

Save record 5

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