Hi Daniel,
Several questions:
1. Your photo shows 4 coupons, not just 1 coupon. Please explain.
2. What were the welding preheat and interpass temperatures?
3. If the test coupon is only 1-1/2-inches thick, why was the PWHT soak time 4 hours?
4. Since the PWHT soak time was 1150 oF, the coupon must have been an ASME P-No. 1 carbon steel. What is the coupon's ASTM classification (e. g. SA-516-70)?
5. The bend in the coupon implies uneven cooling, top to bottom.
6. What were the maximum heating and cooling rates during PWHT?
7. Did the coupon undergo PWHT in a furnace for equal heating and cooling on both sides?
8. Or were electric resistance heaters employed?
Regards,
Dennis Thompson
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Daniel
Sent: Monday, January 22, 2018 11:31 AM
To: Materials & Welding
Subject: [MW:27277] 17-4PH welding( Double aged H1150)
Dear Experts,
We had qualification with GTAW and SMAW (manual process) on 1.5" thick test coupon . to prepare build up welding procedure . our test coupon got Post weld heat treatment at 1150°F for 4 hours ( without solution annealing ) .
Test got failed at the first step for side bend ( see attached picture ).
I`m looking for a reason or reasons of this failure .
Do you think the reason should came from , not perform solution annealing on the test coupon ? or something else should be reason !
Cheers,
DW
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