We carried out PQR for a pipe line job between pipes to flange. Details are as below
Pipe Material: ISO 3183 X65
Flange material: A694 F65
Service: Sour
Size: 20" x 44.45mm
Welding Process: GTAW + SMAW
Preheat: 125°C (using propane heating torch)
Welding Consumable : ESAB ER80S Ni-1 ( GTAW ) for root pass , Hot pass and Fill-1 pass , ESAB E8018C3H4 R ( 3.2mm and 4mm ) for fill passes and capping .
PWHT Temp: 600°C for 2hrs 10mins
Ceq : 0.40
The coupon failed in Charpy Impact Test at -40°C at weld Root center line with low values (16, 26, 18 Joules).
The PQR was carried out going ensuring a two propane Heating torch to ensure an equal preheating is done on the OD and through thickness. Interpass temperature was not below the Preheat temp. The coupon failed again in Charpy Impact test at -40°C at weld Root Centre line (18, 18, 28 Joules) and at Root Fusion Line+2mm (19 joules) at pipe side. The Max hardness was 234HV10 (root HAZ) which is below 247HV10 .
How do I overcome this and what should be the root cause.
Best regards,
TDK YOKESH
PH : +917092847368
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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