Dear Experts,
-- PQR Test Coupon
Base Plate: A387 Gr22 CL2 (P. No. 5A, Gr.1)
Dimension: 500x350x40mm
Application: Heat Exchanger
Joint Design: Double Bevel
GTAW: Er90SB3
Size: 2.4mm
SMAW: E9018-B3
Size: 3.15 & 4.00mm
Preheating: 160֯C min
Interpass Temp: 200֯C max
DHT: 300֯C for 2hrs
The above mentioned test coupon impact and hardness testing failure. Impact value is getting lower and hardness value getting higher.
The impact required average value is 55J and hardness max value is 225BHN but the impact actual value getting 22J and the hardness min actual value getting 208BHN.
What is the exert problem for this failure?
Please give us a deeper explanation for this failure. What is the solution?
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