[MW:35207] Re: Reg: Mechanical Testing Failure Analysis

chances of Martensite due to rapid cooling(faster cooling due to lower interpass temp 200C).   

1. Consider raising the interpass temperature to around 250-300°C

2. Consider  PWHT direct before final weld cooled down.

On Friday, August 9, 2024 at 9:12:56 AM UTC+3 Prathab P wrote:

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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