Diameter of electrode-reg

[k.ilangkumaran ilangkumaran]

Dear Experts,                  While my routine inspection of welding I have noticed Diameter of the electrode used for the capping was not as per the qualified WPS and I was told the diameter of the electrode is not an essential variables.     WPS for SMAW   Now as per the sec IX; Table QW-253   1) the essential variable QW-404.30   2) Supplementary variables QW-404.7/.12   3)  Non essential varaiable QW-404.6          & as per the QW-353   1) QW-404.15/.30 were the essential variables for welder qualification.   So if the diameter of electrode used in production welds beyond 6mm then only the WPS needs to be re written? or Should we insist the welder to use what ever mentioned in the qualified WPS? or the welder should use the electrode that he used while performing his WQT. Can somebody expain me in details how to deal this?   Regards Ilangkumaran

[kannayeram gnanapandithan]

only when there is impact requirement, then change in dia greater is essential, otherwise no problem

It is always use small electrode to avoid more heat input and for slang inclusion

pandithan

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[Muni Andy]

He can go one above and one below.if he is qualified in 3.15 mm can weld 4.0 mm and 2.5 mm.

On Sat, Apr 30, 2011 at 3:22 PM, k.ilangkumaran ilangkumaran <k.ilang...@yahoo.com> wrote:

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[vijay]

Dear Ilangkumaran,

Mr.Pandithan is Right

Electrode Diameter is a Supplementary essential variables means Applies only when there is a Impact Requirement. 

Otherwise deviation of Electrode diameter from the qualified WPS is not a problem as per ASME IX

Regards,

VIjay

[k.ilangkumaran ilangkumaran]

Dear Experts,                   Thanks for your answers. But QW404.06 of SEC IX  says something Can anybody go through it and explain me?   Regards Ilangkumaran --- On Tue, 5/3/11, vijay <vijaya...@gmail.com> wrote:

[ABHISHEK GHOSH]

Dear all,

 

1. During WQT with E7018 , Uphill technique,welders having problem to control undercut in capping by using 3.2 mm dia electrode. but with 2.5 mm dia its ok, My client ask them to use 3.2 mm electrode for capping . How to solve this one...........

 

2. In pipeline down hill welding which electrode is preferable mostly & why : E8010 OR E 8045 p2.

 

Thanks & regards.

 

Abhishek Ghosh

ABHISHEK GHOSH
FAHAHEEL, KUWAIT
MOB: (00)965-60303798

[Karthik]

Hi, QW404.6(Non-essential variable as per QW253) specifies that,If there is any change in the diameter of the electrode as specified in the WPS.It means if there is no Impact requirement, change in diameter of the electrode is a Non essential variable.So In your case there is no restriction as per the code specification, if there is no Impact requirement .you can use any diameter of the electrode. If there is a Impact requirement,as per QW253 it shall be refer to QW404.7(Supplementary essential variable) - it restrict to use the electrode diameter not more than 6mm.If the diameter of the electrode greater than 6mm shall need qualification. Thanks & Regards, (Karthik) 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 Tue, 5/3/11, k.ilangkumaran ilangkumaran <k.ilang...@yahoo.com> wrote:

[Fitria Rahman]

Dear Ilangkumaran

qw 353 did not specify the diameter of electrode. The essential variable is "t" which means thickness of weld deposit.
Legend for QW-352 through QW-357: Ø should be read as "change" (not diameter).

have a nice day

2011/5/3 k.ilangkumaran ilangkumaran <k.ilang...@yahoo.com>

[narisepalli venkateswara prasad]

Dear All,

 

The Dia. of electrode (< 6 mm ) is non essetial variable as per ASME Sec. IX.  However some of Cleint specifications ( Ex. Qatar Petrolium Specifications) mentioned that size of electrode used for capping in PQR only can be used for actual production also.  As per client specification the macro harndness is one of the test for procedure qualifcaiton.  If the electrode for  capping pass is larger than the PQR, then hardness at toe of welds will be higher than obtained in actual PQR due to higher heat input.    Thatswhy the size of electrode for Capping pass is essential variable as per some of client specifications.