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Technical Discussions
Armenia, Joined Nov 2014, 196


Joined Nov 2014
09:47 Jun-13-2019
the calibration block acc. to ASME V for austenitic welding

according to ASME V article 4, Figure T-434.2.1 --Nonpiping Calibration Blocks, if the welding thickness is 45mm, the calibration block thickness can be 38mm or 45mm.
for austenitic welding, we can only use the half skip path, the one skip path can't be used with angle beam because the backwall reflection will contain wave mode conversion, shear wave converts into longitudinal wave, so we can't distinguish the echo signal.
my question is:
1.if we use ASME V article 4 to inspect the austenitic welding, how could we design the calibration block. if we use the same thickness, and the depth of calibration reflector is 1/2T, 3/4T. how can we guarantee the welding root, because we can't use the backwall reflection wave.
2. for PAUT inspection, could we use the Figure T-434.2.1 --Nonpiping Calibration Blocks for TCG construction? because I found it is very hard to do TCG for reflector near the surface and backwall surface, also the conner edge reflection will affect the TCG calibration if we use the side drill hole for TCG calibration. how could we solve this problem? or we can't use the Figure T-434.2.1 --Nonpiping Calibration Blocks for PAUT TCG calibration?

NDT Inspector,
Iran, Joined Mar 2013, 109


NDT Inspector,
Joined Mar 2013
11:42 Jun-15-2019
Re: the calibration block acc. to ASME V for austenitic welding
In Reply to langtuteng2 at 09:47 Jun-13-2019 (Opening).

Figure T 434.2.1 is general for UT.you can adjust location of SDHs(not depth), add more SDH, change length or wide of the block for PAUT. Also if you are going to inspect stainless steel welds you should follow T.451 with additional blocks that SDH located inside the weld.


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