Cellulose electrode redrying

[Pravin G]

Dear expert,

Can anyone advice why cellulose electrode don't need redrying? Any particular Technica reason?

Pravin Poornachandran

Sent from my iPhone

[Kannayeram Gnanapandithan]

because it has got more Hydrogen around 30 to 60ppm, if u do baking , H2 will get lost and purpose is defeated

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Mon, Oct 3, 2016 at 11:43 AM, Pravin G <htcis...@gmail.com> wrote:

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[Shashank Vagal]

Sir,

The cellulose binder gets damaged if it is heated above 50 deg C.

 

Yours Truly,

Shashank C. VAGAL

301, PRATHAMESH, M G Rd – Mahant Rd, Vile Parle East, Mumbai 400 057 INDIA

Tel : +91 22 2611 6640 / (+91) 9821386292 /  8082395502 

 

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From: Pravin G <htcis...@gmail.com>
To: 'anand gupta' via Materials & Welding <material...@googlegroups.com>
Sent: Monday, 3 October 2016 11:43 AM
Subject: [MW:25475] Cellulose electrode redrying

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[JIJILAL K M]

Dear Pravin,

The most important feature of cellulosic type electrode ( E-6010) is ,it's deep penetration arc , which made them first choice for pipe line root pass welding.

Cellulosic electrodes contain a large proportion of cellulose(wood flour- over 30%) .Moisture content of these electrodes is quite high. While cellulose burns in the arc to form a gas shield of carbon monoxide & dioxide , in conjunction with the moisture in the coating, produces a large amount of hydrogen(30 to 45ml hydrogen/100gm weld metal)

The hydrogen raises arc voltage and gives the electrodes their characteristics of deep penetration and high deposition rates.

Baking the cellulosic electrode will reduce deep penetration efficiency and hence not recommended in general .

Best Regards,

JIJILAL K.M. 

QA/QC Manager,

Thai Jurong Engineering Ltd,

KCE SPP Project,Thailand

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[Roy Joseph]

Cellulosic electrodes works better with 2-5% moisture in it.So re drying is not advised.

Regards,

Roy Joseph,

Oman

[Hareesh K V]

Dear all,
Please see and follow the recommendation from the manufacturer.
Please refer the packet of E6013, you can see that 15odeg C heating is recommended.

Regards,

Hareesh K V
+91-8547859202

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[Kannayeram Gnanapandithan]

Redrying/ baking temp is different from Holding temp. Cellulose and Rutile based Electrode are nor Redried / Baked, but are kept in Holding ovens

On 06-Oct-2016 11:52 pm, "Hareesh K V" <haree...@gmail.com> wrote:

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Dear all,
Please see and follow the recommendation from the manufacturer.
Please refer the packet of E6013, you can see that 15odeg C heating is recommended.

Regards,

Hareesh K V
+91-8547859202

On 6 Oct 2016 8:58 p.m., "Roy Joseph" <royjo...@gmail.com> wrote:

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[Hareesh K V]

Dear All,

Please see the attached photos.
There is a correction.  Heating of 110 deg C for half hour is needed.

Regards,

Hareesh K V
+91-8547859202

[John Henning]

The example given is for E6013 electrodes which will have some cellulose but primarily consist of inorganic minerals.  Far different than the high cellulose E6010 or E6011 electrodes.  One should also remember that E6013 was originally designed for sheet metal welding and therefore has a soft, very shallow penetrating arc, and a very fluid slag.  This electrode is typically prohibited for use in pressure vessels and piping by knowledgeable customers/manufacturers – too many problems with cold lapping, lack of penetration and slag inclusions.

 

ASME ScII Part C has the following recommendations for holding and drying:

At least  three issues/problems exist with drying or storing high cellulose electrodes (E6010/E6011) at elevated temperatures.

1)     Since these electrodes produce copious amounts of hydrogen when the cellulose (hydrocarbon) breaks down (or burns) in the arc, the small addition of hydrogen through absorbed moisture is inconsequential

2)    Putting  these electrodes through drying or storing in heated rod ovens can result in coating breakdown, spalling, decohesion and blistering while welding etc.  In fact too high a temperature can result in charring.

3)    Drying out the coating can also result in arc stability issues.  For those who know some old welders who used this stuff at lot, you will find a common trick when the arc was “misbehaving” was to briefly immerse (dunk) the electrodes in water  -  smoothed the arc right out (at least as far as these electrodes can be).

 

E6010 and E6011 electrodes are best stored in their original packaging in humidity controlled conditions at ambient temperatures.  Kept just dry enough to prevent any rusting of the core wire.  

 

Enjoy

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[Abhishek Vyas]

Hi Pravin,

In comparison with other electrodes, a cellulosic electrode must contain some quantity of moisture. This is because of necessity of coating oxidizing potential and decreasing of redox process of carbon, silicon and manganese. Therefore drying of cellulosic electrodes after production process must be avoided. 

Further, exposure to bright sunlight in warm, dry areas may be just as damaging as low-temperature baking, so it is best to keep cellulosic-coated electrodes in cool, shaded regions throughout the work day. 

Rehydrating the electrodes does not restore them to the as-received condition, so the best practice is to discard electrodes that have been exposed to particularly hot or dry conditions, and under no circumstances should cellulosic electrodes ever be placed in electrode drying ovens.

Regards,

Abhishek Vyas