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

By Materials & Welding
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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