Sunday, November 14, 2010

[MW:8258] How to control cracks when weld P91 and P91

Dear All,
I just meet a problem from one of my customers.
It is a Boiler Manufactory in China.
 
Details as follow:
base material: P91
process: SMAW (root) + SAW (filler metals)
Heat Input: high  
I=380A
U=35V
V=250mm/min
Preheat, Interpass Temperature: ≤250℃
 
How to control cracks?
How to increase impact properties afer PWHT?


 

Best regards

 

Roy LIU

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