Understanding NRT- Reading 1- 2 of 2- Radiogaphic Testing A
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
Understanding nrt reading 1- 2 of 2- radiogaphic testing a
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Incomplete penetration, as the name implies, is a lack <strong>of</strong> weld penetration<br />
through the thickness <strong>of</strong> the joint (or penetration which is less than specified).<br />
It is located at the center <strong>of</strong> a weld and is a wide, linear indication.<br />
Incomplete fusion is lack <strong>of</strong> complete fusion <strong>of</strong> some portions <strong>of</strong> the metal in<br />
a weld joint with adjacent metal; either base or previously deposited weld<br />
metal. On a radiograph, this appears as a long, sharp linear indication,<br />
occurring at the centerline <strong>of</strong> the weld joint or at the fusion line.<br />
Melt-through is a convex or concave irregularity (on the surface <strong>of</strong> backing<br />
ring, strip, fused root or adjacent base metal) resulting from complete melting<br />
<strong>of</strong> a localized region but without development <strong>of</strong> a void or open hole. On a<br />
radiograph, melt-through generally appears as a round or elliptical indication.<br />
Burn-through is a void or open hole into a backing ring, strip, fused root or<br />
adjacent base metal.<br />
Charlie Chong/ Fion Zhang
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