30 November 2022

Welding defects

Welding defects

Welding Defects:-

  • Hot cracks
  • Cold cracks/Delayed cracks
  • Porosities
  • Lack of fusion
  • Incomplete/excess penetration
  • Undercut
  • Slag/ Inclusion
  • Mismatch
  • Burn through
  • Root Cavity
  • Caters
  • Spatters

 

What is Meaning of Defect:-

A defect is a reject able discontinuity, which occurs in an amount great enough to render a particular object or structure unsuitable for its intended service based on criteria in the applicable code.

Classification of Defects:-

1) Planar defects / Two dimensional defects —    E.g. cracks, lack of fusion, lack of penetration, are crtical in nature and are not tolerated to any extent.

2) Voluminal defects / Three dimensional defects —   E.g. slag inclusion, cavities, porosities, etc are tolerated to a certain extent depending on the product class and applicable code.

3) Geometric defects–   E.g. excess reinforcement, underfill, root suck back, distortion are also permitted to a certain extent.

Weld Joint Discontinuities:-

Types:-

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