1-the surface of sample may be rough and stress concentration is occured.
2-depend of configuration of partial joint& used H.I in this PQR,previouse weld,the length of coarse grain area in HAZ may be larg.
3-due to concentrated impurities in haz.
item 2& 3 is clear with micro etch.
On Wed, Jul 28, 2010 at 5:52 AM, <candice@chopkiatsiang.com.my> wrote:
All,
I'd carried out a Repair WPQT for 2"Sch160 ASTM A106 pipe. We are to carry
out through repair and partial repair. After the mechanical testing in the
lab, the result failed on tensile test on the base metal. I's rechecked
back on the mill certificate for the pipe but showing no discrepency on the
mechanical properties. Could someone advice on the cause of the failure in
tensile on base metal. Will it because of the heating?
Regards
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