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The method of inspection of welds in structural steel should be according to IS:Â 822 and extent of inspection and testing shall be in accordance with the relevant applicable standard. The inspection of welds during all stages of fabrication and erection should be done for the following objectives.: i) To check the conformity with the relevant standards and suitability of various welding equipments and their performance. ii) To witness/approve the welding procedure qualification. iii) To witness/approve the welders performance qualification. iv) To check whether shop/field welding being executed is in conformity with the relevant specifications and codes of practice.
- Weld defects occurring at the surface such as blow holes, exposed porosity, unfused welds etc.
- Surface cracks in the weld metal or in the parent metal adjacent to it.
- Damages to the parent metal such as undercuts, burning, overheating etc.
- Profile defects such as excessive convexity or concavity, overlapping, unequal leg lengths, excessive reinforcement, incompletely filled grooves, excessive penetration beads, root grooves etc.
- Distortion due to welding i.e., local shrinkage, camber, bowing, twisting, rotation, wariness etc.
- Linear eccentric, angular and rotational misalignment of parts.
- Dimensional errors.
