Re: [MW:27459] Impact test failure ( pipe to Flange )

Dear George , 

SFA 5.28 gives impact value at -50°c as welded condition . E8018C3  is for sour service condition with 1%Ni . Both these wires were certified by esab for a good impact values of max 94J after PWHT (620°C for 9Hr ) . 

On Mon, 5 Mar 2018, 6:52 a.m. George Dilintas, <dilintas@gmail.com> wrote:

If you look into SFA-5.28 you will realize that no Impact test value is given for ER80SNi1. So you should question your selection.

I wonder where you got the E8013-C3. This is not listed in SFA-5.5

2018-03-04 6:08 GMT+02:00 TDK YOKESH <tdky167@gmail.com>:

Dear Gents , 

We carried out PQR for a pipe line job between pipes to flange. Details are as below

Pipe Material: ISO 3183 X65

Flange material: A694 F65

Service: Sour

Size: 20" x 44.45mm

Welding Process: GTAW + SMAW

Preheat: 125°C (using propane heating torch)

Welding Consumable :  ESAB ER80S Ni-1 ( GTAW ) for root pass , Hot pass and Fill-1 pass , ESAB E8018C3H4 R ( 3.2mm and 4mm ) for fill passes and capping .

PWHT Temp: 600°C for 2hrs 10mins

Ceq : 0.40

The coupon failed in Charpy Impact Test at -40°C at weld Root center line with low values (16, 26, 18 Joules).

The PQR was carried out going ensuring a two propane Heating torch to ensure an equal preheating is done on the OD and through thickness. Interpass temperature was not below the Preheat temp. The coupon failed again in Charpy Impact test at -40°C at weld Root Centre line (18, 18, 28 Joules) and at Root Fusion Line+2mm (19 joules) at pipe side. The Max hardness was 234HV10 (root HAZ) which is below 247HV10 .

How do I overcome this and what should be the root cause.

--

Best regards,

TDK YOKESH

PH : +917092847368

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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