Visual Inspection: Know the advantages and disadvantages

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inspeção visual

There are several ways to inspect weld, one of the simplest and most practical is a visual inspection. This is one of a most common tests in the industry, it is carried throughout production which provides, immediate indications. The teste consists of the lighting and subsequent observation of the part, which can be done directly or indirectly by the inspector, using auxiliary equipment (magnifying glasses, microscopes, artificial vision techniques, etc.)


It can also be used individually or in conjunction with the other non-destructive test methods, always being the first method to be applicated in inspection, regardless of the complexity of the part or other test to be carried out.


The visual inspection is rated as one non-destructive test (set of techniques and procedures that allow to evaluate components without inducing any type of damage) begin that it is only possible to observe the surface with the naked eye or with the aid of a magnifying glass. It can also be an exclusion factor, since this can result in the immediate rejection of the part or component, not being able to carry out other subsequent tests.

There are still other techniques, such as radiographic testing or the ultrasound test, which must be part of the quality procedures.


In welding, the visual inspection examination is frequently applied in the detection of defects such as defects associated with connection of components (such as lack of fusion and burnt edges ), cracks, corrosion and erosion (such as lack of thickness).


Advantages and disadvantages in inspection visual


Among the advantages of this type of non-destructive test, we can highlight:

  • It is the lowest cost non-destructive test;
  • Allows to detect and eliminate possible discontinuities before starting or completing the welding;
  • It allows the identification of major discontinuities and generally indicates possible points where discontinuities may arise, which must be inspected by other non-destructive tests;
  • A well-achieved visual inspection provides a reduction in the amount of repairs to the weld, leading to greater production of the other non-destructive tests and therefore decreasing the cost of production.



Among the limitations and disadvantages of this type of trial we can highlight:

  • It depends a lot on the inspector’s experience, as well as on his knowledge in welding, besides the need to be inside the project and its requirements;
  • It is limited to the detection of surface defects.



Visual Inspection at Pipe Masters


Visual inspection requires a clear and precise definition of product acceptance and rejection criteria and trained specialized inspectors. Through visual inspection, Pipe Masters inspectors assess product quality (aesthetic quality) based on their training and experience, but there is no document to support this task. Sometimes the occurrence of a defect in the product can be confused with a defective product and vice versa. This problem is mainly due to the fact that there are no defined and standardized quality criteria.

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