Tuesday, January 23, 2018

RE: [MW:27281] 17-4PH welding( Double aged H1150)

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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