[MW:34785] clarification require for WPS & PQR qualification with impact test

dear expert

we have to do qualification wps ,pqr for the below mentioned materials as per ASME section 9.

Test coupon

SA 516 Gr 70 (P-1 G-2) -Thickness 20 mm

with

IS 2062 E 350 C (Unassigned Metal) - Thickness 50 mm

Code - ASME 

Position - 3G

Process - SMAW 

Electrode - E-7018

Impact =  -20C @ 27J

Question

1) what is the minimum & maximum thickness qualified with impact?(code reference).

2) what has to be considered during and after impact results?(comparing with base metals)

3) Whether Thickness "t" weld metal deposit in coupon should be 13 mm or 3 layer minimum in single side to qualify for maximum to be welded ? 

Thanks in advance.Do the needful. 

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