• Postweld Heat Treatment (Stress Relieving)
  • Gas Firing/Vessel Internal Firing (In-house/On-site)
  • Preheating
  • PWHT/Preheat Procedure Preparation
  • Furnace Design/Consultancy
  • PWHT/Preheat Consultancy
  • Hardness Testing
  • Supply of Stress Relieving Personnel
  • Supply of NDT Personnel
  • Calibration of Chino Recorders
  • Remote Visual Inspection
  • Holiday Testing
  • Non-Destructive Testing (PT,MT,RT,UT)
  • Positive Material Identification (PMI)
  • Phased Array

Preheating

Is a very effective means of preventing weld metal or base metal cracking. It is the application of heat to the base metal prior to a welding operation. It does not change the properties of the steel, but it is advisable under certain conditions to drive off moisture and helps to ensure even expansion to eliminate undesirable stresses. Concurrent heating during welding (also referred to as preheating) retards the cooling thus preventing the formulation of an under bead crack.

Stress Relieving/Postweld Heat Treatment

Is the heating of steel to a relatively high temperature (e.g. 590oC 700oC) shortly after welding, and maintaining that temperature for a specific period of time. The purpose is to reduce internal stresses, caused by welding, quench hardening or by cold working. It also has an advantageous effect on the elasticity, ductility and strength of the metal.

Internal Firing

A method of heat treatment that requires the component to be thermally insulated completely on its external surface. Gas fired portable high velocity burners are inserted into manways at strategic locations and fired directly into the components atmosphere. This virtually converts the component into its own furnace. By maintaining a constant positive pressure from within the vessel and effecting an intensive scrubbing action of the hot gases caused by the high velocity of the gas burners, temperature distribution and uniformity is maintained at all times.

Radiographic Testing

The use of x-rays or gamma radiation, or both, to detect discontinuities in material, and to present their images on a recording medium (film).

Liquid Penetrant Testing

A non-destructive test that uses suitable liquids that penetrate discontinuities open to the surface of solid materials and, after appropriate treatment, indicate the presence of discontinuities. A liquid penetrant is applied to the surface to be examined and allow to enter discontinuities.

Magnetic Particle Testing

A non destructive test method utilizing magnetic leakage fields and suitable indicating materials to disclose surface and near surface discontinuity indications. Used for the detection of surface and near to surface discontinuities in ferromagnetic materials, by applying a magnetic field and a medium sensitive to areas of magnetic flux leakage. The medium will be attracted and held to the surface whereby the visible indication can be interpreted.

Ultrasonic Testing

A non-destructive method of examining materials by introducing ultrasonic waves into, through or into the surface of the article being examined and determining various attributes of the material from effects on the ultrasonic waves. Its primary application in the testing of metal is the detection and characterization of internal flaws. It is also used to detect surface flaws, define bonding characteristics, thickness measurements, corrosion detection, determine physical properties, structure, grain size and elastic constants.

Positive Material Identification

X-ray Fluorescence equipment such as XMET3000TX is used for alloy analysis and identification and hazardous material analysis.

 Phased Array

Advanced UT equipment that would give a real-time image of discontinuities.

 

 

 





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