Impact Test Acceptance Criteria for Dissimilar material PQR qualification

[Biplab Pal]

Dear Gents,

Our Construction Code is ASME B 31.3.

Our Client standard is asking for the minimum impact value of 34/27 J for P1 Gr 1 & 40/32 J for P1 Gr 2 full size (10X10) specimens both Weld metal and HAZ at minimum design temperature for PQR qualification.

Process- GTAW + SMAW

Out MDMT is -45 Deg C.

The PQR tested at -64.7 deg C and the impact values are as follows for Weld 20.33/17 J and for HAZ-1 is 41.5/35.5 & HAZ-2 is 40/50 J.

Specimen size is 10X4.

Is the test result acceptable for Weld zone as per client std.?

We need your kind advice and code reference.

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   bipla...@gmail.com
 
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[Kannayeram Gnanapandithan]

Gr 2 will have less value compare to Gr1

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[MW]

acceptable for subsize specimen

[John Henning]

Depends on your clients specification.  If impact testing is to be performed in accordance with A/SA-370, Table 9 allows multiplication of acceptance criteria by ratio of tested specimen to full size specimen (0.40 in your case).  Further, B31.3, Table 323.3.5 note (2), also allows for applying a ratio to the acceptance criteria for subsize specimens.  In looking at the information provided, you have met the required temperature reduction requirement specified in Table 323.3.4. 

 

In my opinion, a reasonable client should accept the values as meeting their specification requirements.

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