E7018-A1 Electrod

[Zakaria ghrab]

Hi All,

  In our boiler project we have to weld socket tube A210 Gr A1,  38 mm diameter , 4 mm thick  to collector P11 material thick , according client WPS we have to weld by E7015-A1.

What's the difference between EXXXX and EXXXX-A1
May E7018 substitue E7015-A1 ?

Kind regards

--

زكرياء غراب
GHRAB Zakaria
مسؤول عن الجودة
QA/QC SENAD
مشروع المحطة الحرارية ـ الوحدة الرابعة
المحمدية ـ المغرب

[pgoswami]

Hi Zakaria,

 

E-7018-A1 is C-0.5 Mo electrode while E-7018 is just C-Mn electrode. The base metals are  A 210Gr A1(C-0.5Mo, Sec IX-P3 material) and P11(1 or 1.25 Cr- 0.5 Mo), P4) material.

 

So for room temperature tensile, high temperature Creep properties, E-7018-A1 would be the minimum requirement as it meets all the room temperature tensile strength and elevated temperature creep strength of the leaner alloys (P3).

 

See Sec-II, Pt-C, SFA 5.5, Table-2 (for C-Mo electrodes, E-7018-A1) and SFA 5.1, Table-7 for C-Mn(E-7018) electrodes.

 

You should not replace E-7018-A1 with E-7018. This would endanger the weld and make it prone to failure in service.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgos...@quickclic.net

 

---

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Zakaria ghrab
Sent: Tuesday, July 05, 2011 11:12 AM
To: material...@googlegroups.com
Subject: [MW:11595] E7018-A1 Electrod

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[R. Moseley]

Zakaria,
The "A1" designation is for the addition of Chrome moly to the
normally full carbon steel filler metal mixture. It is normally used
for welding/ joining of P3 (Carbon .5Mo materials). In this case it
would not be wise or advisable (as the client has dictated) to use a
filler metal without the addition of the Moly. Hope this helps.

Robert Moseley
Welding Specialist/ Consultant

On Jul 5, 10:11 am, Zakaria ghrab <zakaria.gh...@gmail.com> wrote:
> Hi All,
>
>   In our boiler project we have to weld socket tube A210 Gr A1,  38 mm
> diameter , 4 mm thick  to collector P11 material thick , according client
> WPS we have to weld by E7015-A1.
>
> What's the difference between EXXXX and EXXXX-A1
> May E7018 substitue E7015-A1 ?
>
> Kind regards
>
> --

> *زكرياء غراب
> **GHRAB Zakaria** *

[k.ilangkumaran ilangkumaran]

Dear Pgoswami,   As per SEC IX- 2007; QW/QB-422  SA 210 A-1 comes under Pno:1 Gr 1 and I had referred SEC II part A and found that there is no Molybenum in it. Could you please verify it?   Regards Ilangkumaran  --- On Wed, 7/6/11, pgoswami <pgos...@quickclic.net> wrote:

[pravean ashok]

Dear sir

 

The difference between E7018 it contains iron powderd content

 E7018-a1 refers to  chemical composition in asme sec II part c search E-7018-A1 & read out notes point you get the answer of this

only the thing writeen in standatd A-Z refers only chemical composition of electrode

 

pravean

QA/QC welding inspector

ksa

jubail  

2011/7/5 R. Moseley <robert.m...@yahoo.com>

[kannayeram gnanapandithan]

For creep properties, use .0.5mo only,

2011/7/5 Zakaria ghrab <zakari...@gmail.com>

[iacob catalin]

Dear Zakaria,

the E 7018 not substitute E 7018 A1

E 7018 is electrode for non alloy steel ,and E 7018-A1 is for 16Mo3 materials

[kannayeram gnanapandithan]

In low alloy steel electrode classification, letters denote the weld metal chemistry

for example 7018-A1

                  8018-B2

                  9018-B3

A1---- weld metal chemistry is 0.5Mo

B2---                                  is 1.5 Cr+ 0.5Mo

B3-                                     is 2.25Cr+ 1Mo

 

if ur assembly goes PWHT, it is always better to 0.5Mo rod to compensate tensile and Creep

other wise u can very well use 7018/7018-1

pandithan 

2011/7/10 pravean ashok <gujula...@gmail.com>