Skip to main content

DESTRUCTIVE TESTING

DESTRUCTIVE TESTING

Destructive tests on raw materials, welded joints are usually made as part of the approval of material/ welding procedure or a welder.

Commonly used destructive tests are:
  • Hardness 
  • Bend 
  • Tensile
  • Charpy
  • Fracture tests
  • Macro section

TYPES OF TEST

Quantitative (For measuring a 'quantity') 
  • Tensile
  • Charpy
  • Hardness
  • C.T.O.T. (crack tip opening test)
Qualitative (For assessing joint 'quality')
  • Bend test
  • Nick break 
  • Macro
  • Fillet fracture
The test pieces are cut from the test weld and their location is often specified in the standard. The
areas for test are shown below.
DESTRUCTIVE TESTING

Popular posts from this blog

CHARPY V NOTCH IMPACT TEST

CHARPY V NOTCH IMPACT TEST Object : To determine the amount of energy absorbed in fracturing a standardized test piece at a specified temperature. Method : A machined, notched specimen is broken by one blow from a pendulum. Because scatter occurs in the results, at least three specimens are used to assess the joint represented. Testing is carried out at a temperature specified in the appropriate application standard. Reporting Results: Location and orientation of the notch.  Testing temperature. Energy absorbed in joules.  Description of fracture appearance. Location of any defects. The Charpy impact test, measured in joules, is an assessment of TOUGHNESS. Transition temperature (curve) in steel.

ULTRASONIC TEST

ULTRASONIC TEST INTRODUCTION This method is used to test a variety of both metallic & non metallic products such as welds, forgings, castings, sheets, etc. It has an advantage of detecting sub-surface discontinues with accesses to only one side of the specimen. In this method beams of high frequency sound waves are introduced into the material being tested. The sound waves travel through the material with some loss of energy & are reflected back . This is detected & analysed to detect the presence of flaws. This test employs ultrasonic waves. These waves are mechanical waves that consist of oscillations or vibrations. METHOD TRANSMISSION SYSTEM This method employs two Transducers, one for sending & other for receiving the pulses. These may be short or continuous & are transmitted through the material. The result gets displayed on the CRO connected. The settings of the CRO can be adjusted with respect to time & distance. Prior to testing couplant is used to prov...