Hardness issue on weld metal

[Sathish Kumar]

Dear Experts
We have recently welded 1/2" thick and 1" Thick pipes, Material : AISI 4130. Our hardness requirement is 197BHN-237BHN

This pipes are groove welded to same size of the pipes, Followed by GTAW(ER100S-G) & SMAW(E10018-D2) process. Root is followed by GTAW and SMAW for fill up and capping.on completion of PWHT we observed following hardness value.

After completion of welding and PWHT, we have found hardness range of 285HBN and 265HBN on weld metal. Also we performed PMI on the weld metal to determine the hardness issue, during the result we found following chemical composition on the weld metal respectively.

 

Tabulation shows actual chemistry of the T.C

 

Chemistry observed as per the T.C
	Size	C	Mn	Si	S	P	Cr	Ni	Mo	V	Cu
E10018-D2	3.2mm	0.074	1.980	0.550	0.009	0.022		0.460	0.400
	4mm	0.068	1.940	0.510	0.008	0.021		0.690	0.370
	5mm	0.062	1.980	0.470	0.009	0.019		0.630	0.340

 

 

Tabulation shows actual chemistry after PMI inspection

 

CHOKE & KILL Line
	Chemistry observed as per the PMI											Other metals
Weldment area	C	Mn	Si	S	P	Fe	Cr	Ni	Mo	V	Cu	Ti
On Weld Metal 90°		2.00				95.33	0.047	0.807	0.486	0.03	0.024	1.2667
On Weld Metal 180°		1.966				96.616	0.033	0.838	0.486	0.00	0.058	0.00
On Weld Metal 270°		2.060				96.443	0.057	0.902	0.492	0.00	0.044	0.00
On Weld Metal 360°		2.115				96.401	0.363	0.907	0.501	0.00	0.037	0.00

 

 

 

BOOSTER Line
	Chemistry observed as per the PMI											Other metals
Weldment area	C	Mn	Si	S	P	Fe	Cr	Ni	Mo	V	Cu	Ti
On Weld Metal 90°		1.946				95.287	0.150	0.915	0.500	0.021	0.150	1.113
On Weld Metal 180°		1.992				96.362	0.152	0.932	0.491	0.00	0.152	0.00
On Weld Metal 270°		0.203				96.303	0.203	1.121	0.490	0.00	0.203	0.00
On Weld Metal 360°		0.252				96.556	0.252	0.735	0.480	0.00	0.252	0.00

 

On comparison of chemistry for actual observed in the T.C and PMI result varies accordingly, those variation exceeds the standard requirement of ASME Sec II part-C. Those variation are tabulated for your reference, also PMI is taken on the undiluted weld metal of the capping.

We suspect that due to exceed of Mn and Ti, hardness increased. Please suggest or advice on the following issues.

 

 

NOTE-

Interpass Temperature maintained: 300°C

Preheat Temperature maintained: 210°C

Regards
S.Sathish kumar

[Jim Price]

At what temperature was PWHT, holding time, cooling rate.

 

Jim Price | Welding Engineer, CWI

Direct:  320.7463439 | Fax: 417-862-5564

jimp...@polarcorp.com

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[Sathish Kumar]

Dear Jim
Following is the PWHT condition carried out

1. Rate of heating-100 °C
2. Soaking Temerpature-635 °C
3. Soaking Time-2Hrs
   
4. Rate of Cooling-100 °C, upto 427°C, After that air cooling.

Local PWHT is carried out on the welded area by electrical resistance(Coil Type)

Regards

Sathish kumar

[Antonio Diaz]

Asume Conde B31.3 in PWHT section  is ndicated  what time and temperature fdoyou need for making stress relief.

Specif section un this moment I can not tp tell you.

Also you hace todo consider Asme Conde VIII snd Asume Conde IX

El 23/05/2016 08:57, "Jim Price" <JimP...@polarcorp.com> escribió:

This message is eligible for Automatic Cleanup! (JimP...@polarcorp.com) Add cleanup rule | More info

At what temperature was PWHT, holding time, cooling rate.

 

Jim Price | Welding Engineer, CWI

Direct:  320.7463439 | Fax: 417-862-5564

jimp...@polarcorp.com

 

 

 

 

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Sathish Kumar
Sent: Friday, May 20, 2016 3:56 AM
To: Materials & Welding
Subject: [MW:24816] Hardness issue on weld metal

 

Dear Experts

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[George Dilintas]

The manganese values you have in the filler metal composition justify such high hardness on the weld metal.

Manganese is increasing hardenability and lowers critical cooling rate.

It is very probable that the high hardness is due to martensite formation and not only to residual stresses.

So you should use a filler metal with lower Mn content or revise the PWHT

 

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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

[williams p wilson]

Dear Mr.Sathish Kumar,

Currently, we are also facing the same problem.

Can you please explain how to solve this matter?

Thank You & Regards

Williams P Wilson

QA/QC Engineer

Welding Inspector (CSWIP 3.1)

Cell: (+968) 94600828

P Please consider the environment before printing this message

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