[MW:13373] Failure Of Root bend test of Welding (CS to SS)

Dear Sir,

 

Advance happy new year to all.

 

I have done a PQR(As per ASME Sec ix) of 6", Sa106 GrB to Sa 312 TP 316L. One of the root bend of the same failed.

 

Consumable used: ErNiCr-3. 

 

Tesile strength T1=507 and T2=514MPa(Min Rqd 415MPa);

 

Hardness:

Sa106 Gr B side p.metal: 160,151,147

Sa106 Gr B side HAZ:160,156,156

Weld: 193,170,165

Sa312 TP316L P.metal: 175, 175,181

Sa312 TP316L HAZ: 165,151,151

Face bends are satisfactory.

 

One root bend satisfactory.

 

Please give me the possible reasons and the precautions on further doing the PQR.

 

Regards,

 

Hareesh K V

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