Query on SMAW electrode selection for API 5L X65

[Ari]

Dear All,

Can you please advise, why E6010-G (root) & E-7010-P1 (hot/fill) are
used for Oil pipelines(Sour) containing parent material of API 5L X65.
Since these type of PQR/WPS are being approved by most of the
Company.

As, X65 has an YS of 65,000 Psi, whilst the electrodes used E6010 has
YS of 48,000 Psi, and E-7010-P1 has YS of 60,000 psi. By using both
of these electrodes the weld metal strength would not exceed YS
60,000 psi.

How its acceptable to keep the low weld metal strength(<YS 60,000 Psi)
than the parent metal (= YS 65,000Psi).

Thy suppose to use E8010 for root and E8018 for hot/fill, for API 5L
X65 materials, which only would give the equivalent WM strength.

As we all know that overmatching weld metal strength causes gross
section yielding in the pipe, whereas Undermatching weld metal
strength will cause straining of the weld.

Your advise/suggession, based on experience is appreciated.

Regards,

Ari

[G.Alagarasan]

Ari,

Offshore Pipe industry  prefer to use 6010 for root

1.to avoid root defects
2.better ductility than 7010 and 8010. 
3.welder friendly electrode

Though electrode is classified under 6010, its UTS and YS will be higher than 70 Ksi.

Regards,
Alagu

[babu k]

Hi,

 

Put it in simple words, the use of E6010-G is to keep the dilution level to be minimum ; 

 

Thanks & Regards,

 

K.Babu

Singapore

[ARI]

Hi,

 

Using E6010-G would keep the dilution level as minimum, but at the same time, it wouldn;t give the UTS equal to Parent metal UTS for API5L X65?

Regards,

 

Ari

[pjo...@technip.com]

Dear Ari,

The selection of welding rod is very "tricky" and "not so straight forward"
matter. I would like to say that the original selection of E6010+E7018-P1
may be the appropriate even though the specified/guaranteed strength level
of the WM is somewhat to far less than that of the BM. If you feel it is
difficult to clear the PQR you may use E8018-P1 for outer pass, but I
recommend to use E6010 for root run. This is mainly because its ease in
welding at low current for root run (thin and detachable layer of slag is
an added advantage). Also, the lower strength weld metal may be a safer
choice to avoid typical problems of root cracking, particularly, X65 grade.

But please note that the lower strength of E6010 may be compensated by
higher strength of E8010. And the same proportion should be judiciously
followed.

I hope this clarifies,

Best regards,

Prasad




"G.Alagarasan"
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Subject
[MW:1787] Re: Query on SMAW
19/03/09 06:07 PM electrode selection for API 5L X65


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[hakan sitem]

Hi, pls note the following applications; Mainline Welding:   Steel Grade	Root Pass	Hot Pass	Filling	Cap
X42/X52	Pipeweld 6010	Pipeweld 7010	Pipeweld 7010	Pipeweld 7010
X60/X65	Pipeweld 6010	Pipeweld 8010	Pipeweld 8010	Pipeweld 8010
X70	Pipeweld 6010	Pipeweld 9010	Pipeweld 9010	Pipeweld 9010

 

Weld area strengths and properties should be observed. So we will focus on  "Total Weld Metal Area" and also HAZ for the required
--- On Sun, 22/3/09, ARI <ari...@gmail.com> wrote:

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[SENTHILKUMAR SWAMINATHAN]

For mainline, we used 40" dia X65/1" WT root 6010, remaining 8018G.   Regards, S.Senthilkumar --- On Mon, 23/3/09, hakan sitem <hakan...@yahoo.com> wrote:

Filling

Cap

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[Ali Asghari]

i think ,this chose is best because the service condition induceed the H embrittlement or cold crack even after days or months.therefore for reducing the probability of this crack ,the total strength of weld metal must be less than base metal and strain occur in weld not base.

---

From: Ari <ari...@gmail.com>
To: Materials & Welding <material...@googlegroups.com>
Cc: pssada...@yahoo.com
Sent: Thursday, March 19, 2009 1:45:44 PM
Subject: [MW:1784] Query on SMAW electrode selection for API 5L X65

Dear All,

Can you please advise, why E6010-G (root) & E-7010-P1 (hot/fill) are

used for Oil pipelines(Sour) containing parent material of API 5L X65..

[Chandulal Vithlani]

As per API 510, MAWP is defined as “The maximum gauge pressure permitted at the top of a pressure vessel in its operating position for a designated temperature. This pressure is based on calculations using the minimum (or average pitted) thickness for all critical vessel elements, (exclusive of thickness designated for corrosion) and adjusted for applicable static head pressure and non-pressure loads, e.g. wind, earthquake, etc.”.

 

What is the designated temperature?

 

How does MWAP differ from Design Pressure?

 

Similarly, MDMT has been defined in API 510 as “The lowest temperature at which a significant load can be applied to a pressure vessel as defined in the applicable construction code (e.g. ASME Code, Section VIII: Division I, Paragraph UG-20(b)).”

 

What is the difference between MDMT and Design Temperature?

 

 

Regards

 

Chandulal S Vithlani

 

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[Johnson Madukayil]

Designated temperature normally is the Design Temperature or Desired Temperature.
MAWP for practical purposes is synonymous with Design Pressure. But many a times MAWP>Design Pressure, especially when you use stronger or thicker than required material for fabricating the pressure vessel.
MDMT is the lowest design temperature that the metal can be exposed to and not rupture under pressure (MDMT is important in cryogenic applications and in very cold places)

[babu k]

Hi,

 

The strength of joint not purely depend on the root pass.

 

My explanation as follows, 

 

1) Main problem starts at Root  if you have the different metallurgical phases at the root, , say you have 50% ferrite and 50% pearlite, the properties of metallurgical phases are different. Obviously that would carry forward to mechanical properties too.

 

2) As we all ,know the corrosion starts, where ever you have two differrent phases or chemical composition ; So in order to avoid this variation , it is necessary to keep the dilution level to minimum in the root pass

 

3) It is well proved by the researchers that, dilution is more on the root pass.

 

4) The strength of weld, not purely depend on the Root passes.

 

 

Thanks & regards,

 

 

K.Babu

Singapore

[César Alexis Viteri Pérez]

Dear all,

The root pass is grinded to te half (aprx) before make the hot pass. the efectiva area is fullfilled with hot+filler passes, then the final strenght of joint doesn't depend on root pass.

Regarding metallurgical issues I agree and give thanks to Mr. Babu for the explanation.

One more factor is the operative difficult of make the root pass with 7010 or 8010.

BR

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Date: Mon, 30 Mar 2009 22:19:46 +0800
Subject: [MW:1847] Re: Query on SMAW electrode selection for API 5L X65
From: kbab...@gmail.com
To: material...@googlegroups.com

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