[MW:8279] RE: 8258] How to control cracks when weld P91 and P91

Dear  Roy,

 

Pl, conform  tp P91 by PMI.Because, I have  also china  customer

& their  composition  is  different  from ASTM/BIS.

Review   PQR  once again.

Thanks,

 With Warm Regards,

Keep in touch,

 K.NANDAGOPAL;

09977729258

09360049258-

 

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Roy LIU??
Sent: Sunday, November 14, 2010 6:00 PM
To: materials-welding@googlegroups.com
Subject: [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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