[MW:11596] RE: 11595] E7018-A1 Electrod

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,

pgoswami@quickclic.net

 

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

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

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

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