//What is Welding Inspection

What is Welding Inspection

Welding inspection typically consists of a series of quality control checks carried out by welding inspectors and/or NDT technicians to ensure welded joints meet required levels of quality and are of suitable quality for the purpose in service (fit for purpose). A range of welding inspection techniques may be applied within the methods mentioned below, depending on factors such as joint configuration, specific defects of interest, material type/thickness and whether in shop or on site, to list but a few.
Types of Welding Inspection
Visual inspection, also known as visual testing (VT) is the primary test method of non-destructive examination of welded joints for surface breaking defects (e.g. cracking) and damage/corrosion, both within the weld metal and in the adjacent surrounding material.
Radiographic testing (RT) and ultrasonic testing (UT) are forms of non-destructive testing which detect sub-surface discontinuities in the internal structure of the welded component.
Surface testing methods include liquid penetrant inspection (LPI) or magnetic particle inspection (MPI) to detect fine surface cracks, porosity and other surface-breaking discontinuities within the welded component.
Destructive weld testing is carried out by cutting sections from welded joints and subjecting them to various mechanical tests. Methods typically include macro cross sections, tensile tests, bend tests, impact tests and hardness tests. These destructive tests provide combinations of both quantitative and qualitative results.
What is the Meaning of Third Party Inspection in NDT?
Third party inspection is the application of the various methods, described above, by independent bodies (such as TWI) to ensure the findings are impartial of both the client and contractor in typical fabrication situations. To find out more about third party inspection in NDT and what TWI offers click here.
What’s the Difference Between Quality Control and Inspection?
Inspection is the application of methods of examination to ensure that quality is controlled to an acceptable level.
What are the Qualities of a Good Weld?
A good weld generally exhibits a smooth, uniform and consistent appearance. Penetration (extent of fusion into the parent material) is a significant factor as it determines the cross sectional strength of the weld and therefore its load carrying capability in service.


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