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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

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FILLET WELD FRACTURE TEST

FILLET WELD FRACTURE TEST Object :  To break the joint through the weld to permit examination of the fracture surfaces for flaws and to check root penetration and fusion. Method: The specimen is cut to length and a saw cut, normally 2 mm deep, is made along the center of the weld face. The specimen is fractured by bending or hammer blows. Reporting Results: Thickness of parent material.  Throat thickness and leg length.  Location of fracture. Appearance of joint after fracture. Depth of penetration / lack of penetration or fusion.

NDT ( NON DESTRUCTIVE TESTING )

NDT (NON DESTRUCTIVE   TESTING) :-  Non Destructive Testing in great variety are in world   wide used to detect variations in structure, minute changes in surface finish, the presence of cracks or other physical discontinuities, measure   the thickness   of materials   and   coatings   and   to   determine  other characteristics of industrial products. REASON'S FOR THE USE OF NDT: "NDT" is used by the manufacturers for the following reasons:  1. To ensure product reliability. 2. To make profit for the user. a)    To ensure customer satisfaction b)   To aid in better product reliability. c)    To control the manufacturing processes. d)   To lower the manufacturing costs. e)    To maintain uniform quality level. SOME OF THE MOST COMMON NDT METHODS ARE : 1.VISUAL ...

BEND TESTS

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