Destructive tests aim to examine the mechanical, chemical, and metallurgical properties of a weldment by breaking, deforming, or chemically processing test specimens removed from a welded joint. These tests are considered to be a direct method of examining the qualities of the weldment.
The destructive tests can be classified into mechanical tests, chemical tests, and structure tests.
The destructive tests are often used to confirm whether or not specific welding procedures can produce the required qualities of the weldment. The following sections outline the major destructive tests.
Non- destructive tests
In order to guaranty the quality of a welded structure, it is indispensable to know what welding defects may or may not exist in the welds. For this purpose, a welded structure could be examined by using a destructive test after fabrication; however, the tested structure becomes out of use if it is fractured by the test.
Therefore, destructive tests are conducted with test specimens, not with a product (except for the sampling test for small products).
Since finished products should never be fractured by a test, it is important to examine the soundness of the welds of the products without breaking them. For this purpose, Non destructive tests are conducted.