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		Non Destructive Testing

		Training & Certification

	Our Services

	Radiography Testing -Conventional Methods

	Phased Array Ultrasonic Inspection

	Ultrasonic Testing

	Automated Ultrasonic Testing (AUT)

	Stress Relieving

	Magnetic Particle Testing

	Dye Penetrant Inspection (DPI)

	Positive Material Identification

	Cross Country Pipelines by X-ray Crawlers

	TOFD (Time Of Flight Diffraction)

	RTR (Real Time Radiography)

	RFET (Remote Field Eddy Current Testing)

	Eddy Current Testing

	IRIS (Internal Rotatory Inspection System)

	Wire Rope Testing

	Stress Relieving

	Machining induces stresses in parts. The bigger and more complex the part, the more the stresses. These stresses can cause distortions in the part long term. If the parts are clamped in service, then cracking could occur. Also whole locations can change causing them to go out of tolerance. For these reasons, stress relieving is often necessary
	Typically, the parts that benefit from stress relieving are large and complex weldments, castings with a lot of machining, parts with tight dimensional tolerances and machined parts that have had a lot of stock removal performed.
	Stress relieving is done by subjecting the parts to a temperature of about 75 ºC (165 ºF) below the transformation temperature, line A1 on the diagram, which is about 727 ºC (1340 ºF) which is about 727 ºC (1340 ºF) of steel—thus stress relieving is done at about 650 ºC (1202 ºF) for about one hour or till the whole part reaches the temperature. This removes more than 90% of the internal stresses. Alloy steels are stress relieved at higher temperatures. After removing from the furnace, the parts are air cooled in still air.

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