Welding Inspection

Welding Inspection is used to test or assure the quality of welds, and secondarily to confirm the presence, location and coverage of welds. Because these welded connections may encounter loads and fatigue during product lifetime, there is a chance they may fail if not created to the proper quality or specification.

Welding Macro

Methods of Welding Inspection and Testing are used to assure the quality and correctness of the weld after it is completed. This term generally refers to testing and analysis focused on the quality and strength of the weld, but may also refer to technological actions to check for the presence, position and extent of welds. These are divided into destructive and non-destructive methods. Welding Inspection is classed as non-destructive and mainly includes Visual Scanning and Visual Examination. Visual Scanning is a quick look to check the presence and aesthetics of the weld. Visual Examination is a more in depth look at an area of weld, checking for surface imperfections like :

  • Cracks
  • Lack of Fusion or Incomplete Penetration
  • Undercut
  • shrinkage Grooves - Root Cavity
  • Reinforcement
  • Excess Penetration
  • Linear Misalignment
  • Overlap - Overroll
  • Toe Shape
  • Surface Pores - Porosity
  • Weld Size

AS/NZS1554 part 1 states that:

The inspector shall have suitable training and experience in the fabrication and inspection of welded structures. The holding of the following shall be accepted as evidence of these qualifications:

(a) International Institute of Welding diploma as an IIW Welding Inspector, at the appropriate level.
(b) A Welding Technology Institute of Australia Certificate as a Welding Inspector, at the appropriate level.
(c) A Certification Board of Inspection Personnel (CBIP) New Zealand Welding Inspector.
(d) A certificate as a structural welding supervisor in accordance with AS2214.
(e) Have other qualifications and experience acceptable to the principal.

Prior to and during welding, the inspector shall inspect the set-up of the work and ensure that:

(a) welds are in accordance with the drawings.
(b) the welding is carried out on the specified material with suitable equipment.
(c) correct procedures are maintained.
(d) the work is performed in accordance with the requirements of this standard.

Suggested Extent of Non-Destructive Examination (NDE)

Weld CategoryExtend of NDE ( % )
Visual MeansOther Means
Visual ScanningVisual ExaminationMPI or PTRT or UT
GP100%5% to 25%0% to 2%Nil
SP100%10% to 50%0% to 10%0% to 10%

Welding Macro