RE: [MW:25788] Limits of E6013 in pressure vessel (sec viii div 1)

ASME Code does not say explicitly on the use of Non-Low Hydrogen electrodes, e.g. 6013. However good engineering practice always prevails in addition to ASME Code requirements.

 

Knowing the facts that “diffusible hydrogen” is the root cause of many damages, e.g. hydrogen induced fabrication damages as well service induced hydrogen damages, it is not advisable to use 6013 electrodes for vessels exposed to internal pressures and any process environment as a good practice.

 

However for atmospheric vessels (with no or very minimal internal pressure) use of 6013 electrodes may be allowed subject to satisfaction of the clients and other parties concerned, though at the first instances, staying away from E-6013 would be advisable.

 

A change from E-7018 to E-6013 would not have much financial savings knowing the facts that electrode consumption are typically 2-3% of equipment weights (rule of thumbs).

 

Below are some of extracts from Sec VIII, DIV-I codes on use of low hydrogen electrodes.

 

Thanks.

 

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist ,

Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgoswami@quickclic.net

pradip.goswami@gmail.com

H-905-6799677, 905-9631505

C-905-9793232

 

UCS-56(f)(4)(a)

 

(-a) The weld metal shall be deposited by the manual shielded metal arc process using low hydrogen electrodes. The electrodes shall be properly conditioned in accordance with Section II, Part C, SFA-5.1, Annex A,

A6.11; and SFA-5.5, Annex A, A6.12. The maximum bead width shall be four times the electrode core diameter.

 

UHT-82: Due consideration shall be given to electrodes and filler metals for all welding processes to minimize the sources for hydrogen. When low-alloy steel electrodes and filler metals are used, the classification shall include

an H4 supplemental diffusible hydrogen designator (4 ml of hydrogen max. per 100 g of weld metal) for each of the following.

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-------- Original message --------

From: Prasad Rode <purode333@gmail.com>

Date: 30/11/2016 09:52 (GMT+02:00)

To: Materials & Welding <materials-welding@googlegroups.com>

Subject: [MW:25779] Limits of E6013 in pressure vessel (sec viii div 1)

 

Dear sir,

In fabrication of pressure vessel from 10mm thk plate, would we allow to use E6013 electrode.

Is any where given in code of sec viii div 1, about limits of E6013, or only E7018 is allow.

Regards
Prasad Rode

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