Technical Terms and Definitions

  • Belleville Spring - also known as a Belleville washer, coned-disc spring, conical spring washer, disc spring, or cupped spring washer, is a type of spring formed like a washer.
  • Burst diaphragm - also known as a rupture disc or burst disc, is a single use relief device designed to burst at a calculated pressure or vacuum in order to relieve damaging conditions.
  • Burst disc - also known as a burst diaphragm or rupture disc, is a single use relief device designed to burst at a calculated pressure or vacuum in order to relieve damaging conditions.
  • Check valve - device when actuated by a pressure or vacuum above a calculated level, opens proportionally to the excess pressure to relieve damaging conditions.
  • Inert Gas – gas used during welding to shield from contamination that normally does not combine chemically with the base metal or filler metal.
  • Gas tungsten arc welding (GTAW) - also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld.
  • Heat-Affected Zone - Section of the base metal, typically adjacent to the weld zone, whose mechanical properties or microstructure have been altered by heat.
  • NDT (Non-destructive testing) - testing that evaluate the properties of a material, component or system without causing damage to the item.
  • Relief valve - device when actuated by a pressure or vacuum above a calculated level, opens proportionally to the excess pressure to relieve damaging conditions.
  • Rupture disc - also known as a burst disc or burst diaphragm, is a single use relief device designed to burst at a calculated pressure or vacuum in order to relieve damaging conditions.
  • TIG welding (tungsten inert gas) - also known as Gas tungsten arc welding (GTAW), is an arc welding process that uses a non-consumable tungsten electrode to produce a weld.
  • Thermal Stresses - Stresses in metal resulting from non-uniform temperature distributions.
  • Weldability - The capacity of a material to be welded under the fabrication conditions imposed into a specific suitably designed structure and to perform satisfactorily in the service.