Monday, September 27, 2010

Re: [MW:7210] use of E 7018 Electrode for stuructural welding without proper drying and holding

Hi,
Please find below the comments on your quiery.
what will be the effect in Mechanical/chemical proerties of deposited weld metal of  E7018 which is used for Structural welding of angle bar( material CS) without drying  (at 260-430deg C) and Holinding(at 120 deg C).
  
Can E7018 be used without proper drying and holding for stuructural welding( fillet weld only) of angle bar/supports(material CS).
 
No.
Using of Elctrodes without baking will leads to under-bead cracking. Usually whatever code that you are welding to will detail the process. API, AWS or whatever. It's the hydrogen trapped in the weld that makes the difference. Depending upon materials, the defect may not be detectable for several days.
 
Also Pls.Find below the Extraction from AWS D1.1 for electrode restrictions on A514 and A517(if it is applicable to you)

5.3.2.5 Electrode Restrictions for ASTM A 514 or

A 517 Steels. When used for welding ASTM A 514 or

A 517 steels, electrodes of any classification lower than

E100XX-X, except for E7018M and E70XXH4R, shall

be baked at least one hour at temperatures between

700°F and 800°F [370°C and 430°C] before being used,

whether furnished in hermetically sealed containers or

otherwise.
 


 
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Sun, 9/26/10, asad azmi <azmiasadayub@gmail.com> wrote:

From: asad azmi <azmiasadayub@gmail.com>
Subject: [MW:7196] use of E 7018 Electrode for stuructural welding without proper drying and holding
To: materials-welding@googlegroups.com
Date: Sunday, September 26, 2010, 11:08 AM

Dear All,
 
Goodday.
 
 
what will be the effect in Mechanical/chemical proerties of deposited weld metal of  E7018 which is used for Structural welding of angle bar( material CS) without drying  (at 260-430deg C) and Holinding(at 120 deg C).
 
 
Can E7018 be used without proper drying and holding for stuructural welding( fillet weld only) of angle bar/supports(material CS).
 
 
Thanks in advance for your valuable suggestions.
 
Best  Regards
 
Asad Azmi
 
 
 
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