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Inspection and Testing of Welds

Inspection and Testing of Welds - Welded joints in a structure (e.g., a bridge) are expected to possess certain service-related capabilities. Welded joints are generally required to carry loadings of various types in which the weld is subject to stress of either a simple or complex character. Moreover, a finished weld is not always as good or as bad as it may appear to be on its surface. It is therefore necessary to find out how satisfactory or sound the weld. For this purpose certain weld inspection and testing procedures have been discovered and standardized to estimate the expected performance of the welded structures.
Weld Inspection and Weld Testing are two different terms with their functions somewhat overlapping. Inspection has to do with the observations of the processes and products of manufacture (e.g. weldments) to ensure the presence of desired qualities or properties. In certain cases, inspection may be entirely qualitative and involve only visual observation of correctness of operation or dimensions, examination of surface defects of welded joints, etc., whereas in other instances, inspection may involve the performance of complicated tests to determine whether specifications required meet or not.
	Testing, on the other hand, specifically refers to the physical performance of operations (tests) to determine quantitative measure of certain properties such as mechanical which will be explained later. Testing aims to determine quality, i.e., to discover facts regardless of the implications of the results, whereas Inspection intends to control quality through the application of established criteria and involves the idea of rejection of substandard products.

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