Visual inspection or “visual examination” is the most common non-destructive testing (NDT) method of evaluating surface weld quality without conducting a test.
When conduction a visual inspection the weld and heat effected zone is examined to a standard, which will specify the permissible levels of imperfections. A weldment becomes defective should any of these levels be exceeded.
Weldtest welding inspectors hold the necessary experience and mandatory qualifications to ensure a comprehensive and valid examination is carried out.
Visual inspections are widely used in the structural steel industry. Visual inspections are one of the most common and oldest forms of non-destructive testing (NDT).
A visual inspection is actually an examination rather than a test. The is that a test requires equipment being utilised or incorporated into the examination. A test is normally invasive.
Visual inspections is a surface inspection only and is an extremely effective and reliable testing method. Visual Inspections are a great form of quality control.
When compared to other inspection methods, visual examination is more cost effective. There is little to no equipment required to perform the test and wider areas can be examined much faster. Visual inspections are simple and less technologically advanced compared to alternative testing methods.
This type of inspection also often eliminates the need for further types of testing. Visual Inspections are normally the minimum required for pre-test methods such as magnetic particle inspection (MPI) or magnetic testing (MT) and/or ultrasonic testing (UT).
Visual inspection is typically the first step in the testing process and is used to inspect a variety of external and internal surfaces. These include but are not limited to storage tanks, pressure vessels, piping, castings, forgings, machined components and welded structures.