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New Practice for Standard Practice for Flaw Sizing using Total Focusing Method
1. Scope
This standard practice establishes procedures for evaluating length and vertical extent sizes of flaws in metal weldments using the post processing algorithms referred to as total focusing method.
Keywords
flaw sizing, Total Focusing Method (TFM
Rationale
Welding flaws introduced during manufacturing or that occur during service of a component have the potential to cause the component to fail. NDT methods such as ASTM E2700 are intended to locate flaws. Since not all flaws will result in failure, it is desirable to have a means of assessing the dimensions of flaws so that fracture-mechanics engineering calculations may be used to assess if the component is still fit for service if the flaw is left unrepaired. In addition, reliability of an inspection procedure is often established using probability of detection (POD). POD requires that flaws are intentionally placed in components. POD calculations require a high degree of accuracy of flaw sizes to ensure that the POD correctly indicates the reliability of the NDT procedure.
