According to para. 323.2.2 for lowe

[Bharanirajali]

According to para. 323.2.2 for lower temperature limits:
“Listed materials shall be tested as described in Table 323.2.2 except as exempted by (d) through (j). See Appendix F, para. F323.2.2.”
Based on clause (j)
“(j) Impact testing is not required for the following combinations of weld metals and design minimum temperatures:
….. (2) for austenitic weld metal
(-a) having a carbon content not exceeding 0.10%, and
produced with filler metals conforming to AWS A5.4, A5.9, A5.11, A5.14, or A5.22
at design minimum temperatures of −104°C (−155°F) and warmer, or
(-b) having a carbon content exceeding 0.10%, and
produced with filler metals conforming to AWS A5.4, A5.9, A5.11, A5.14, or A5.22
at design minimum temperatures of −48°C (−55°F) and warmer”

Question :
Material Grade – A671 CL60 C22+3mm 625 Clad- Normalized
Filler metal- ERNiCrMo3
Thickness – 34mm
MDMT- -45 deg (Base metal impact is exempted up to 15mm)
As per table 322.2.2 material is falling under column B if the thickness is more than 15mm (Column B refers table 323.3.1 where it says for WPS impact testing is required for both weld and HAZ )
However, based on the above para 322.2.2 exemption clause (j) is impact can be exempted for weld and HAZ