Three classes of radiographic quality are offered for possible application to welds in general fabrication. Normally@ the choice of an appropriate quality level is made by the engineer@ the user or may be contained in the contractual documents. Among the possibilities are the quality levels shown in this document@ however@ other choices may also be appropriate.
PRG-1995由AWS - American Welding Society 发布于 1995-01-01,并于 2000-11-03 实施。
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