Can you please clarify which was the condition for your test :
1) the values obtain are above the acceptance of base metal UTS and just sample broke from the base metal region
2) Values obtained are less than the base metal UTS and broken from base metal
Once you written failed means the condition 2) would exist but still if you can confirm. Some times cross section area smaller in base metal results in the condition (1) which is acceptable as per code. Even UTS value less than 5% also acceptable if its broken form the weld.
In case of Condition (2) check the fractured surface to ensure that there is no inclusion / porosity / lamination or other defect in the region of breaking.
Please let me know the about the above information and also actual values obtained to reach to the conclusion of failure.
Regards.
CK
-- 1) the values obtain are above the acceptance of base metal UTS and just sample broke from the base metal region
2) Values obtained are less than the base metal UTS and broken from base metal
Once you written failed means the condition 2) would exist but still if you can confirm. Some times cross section area smaller in base metal results in the condition (1) which is acceptable as per code. Even UTS value less than 5% also acceptable if its broken form the weld.
In case of Condition (2) check the fractured surface to ensure that there is no inclusion / porosity / lamination or other defect in the region of breaking.
Please let me know the about the above information and also actual values obtained to reach to the conclusion of failure.
Regards.
CK
On 28 July 2010 05:22, <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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