Macroscopic Examinations

Macroscopic Examinations from Victorian Testing & Inspection Services

By: Victorian Testing & Inspection Services  28-Aug-2012
Keywords: Testing, Certification, Macroscopic Examinations

Macroscopic Examinations (macro tests) are used to assess weld quality. This method of testing typically involves the removal of small samples of the welded joint. These samples are polished across their cross-section and then etched usually by various acid mixtures, dependent on the base material used. The acid etch provides a clear visual appearance of the internal structure of the weld. Particular interest is often shown at the fusion line, this being the transition between the weld and the base material. Such items as depth of penetration, lack of fusion, inadequate root penetration, internal porosity, cracking and inclusions can be detected during inspection of the etched sample. This type of inspection is obviously a snapshot of the overall weld length quality when used for sampling inspection of production welds. This type of testing is often used extremely successfully to pinpoint welding problems such as crack initiation, when used for failure analyses. VTS are able to conduct Macroscopic Examinations to a variety of metallic welded samples in accordance with all common test specifications as well as weld procedure qualifications.

Keywords: Certification, Macroscopic Examinations, Testing,

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