Low Hydrogen Electrode in Steel Structure Application

[Endri Prasetyo]

Dear Experts,

Anybody can advice please, when we use low hydrogen type electrode for steel structure welding erection (SMAW process) does it require to be baked all the time @70 C deg on work station?
Is it acceptable when the welder only keep the electrode into the portable oven without baking (after issued from holding oven) although it is a not best practice?
For information, the material of the steel structure is carbon steel Q235.

Appreciate your sharing. Thanks.

Regards,
Endri

[meemo prasad]

Low hydrogen electrodes must be baked in mother oven at 250-300 degree C  for 2 hrs. The carry oven is for maintaining the temperature of maximum 100 degree C. The Low hydrogen electrodes are very sensitive to the moisture and can inject hydrogen to the weld and can affect the weld zone results in hydrogen induced crack , that's it should must.

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

[Kaja Mohideen]

Dear Mr. Endri,

 

All kinds of basic coated Electrode (Low Hydrogen) must be baked for (E7018) at 230 degrees for 2hours then it transferred to Holding oven at 120 degrees for continuous use, After that you can issue the electrode from holding oven to portable oven at Minimum 60 degrees maintain for shop and Site welding,  Electrode return to holding oven at the end of the shift which electrode not exposed to atmospheric for the Maximum hours, So when the electrode exposed above the maximum hours, it shall be rebaked once, the rebaked electrode shall not be rebaked again, should scrap.

 

It’s all about to prevent the electrode to control Moisture Pickup

 

Refer AWS A5.1: Specification for Carbon steel Electrode

 

Best Regards,

Kaja Mohideen

QA/QC Manager

--

[Fitria Rahman]

I believe each contractor have had procedure to describe the system of
storage, handling and treatment of welding consumable.
SMAW with low hydrogen coatings, must be kept at temperature of a min
70C. You can use portable oven as i did in our projects. Please supply
the electrode to the welder with the number that it should be. I know
you get my point.
When your electrodes are exposed to the air/atmosphere (room
temperature) for a few days, the electrode shall be re-dried. Put them
at oven with with 350C; 2hrs.
Please go to data sheet to get more understanding.

Rgds

2011/12/8, Endri Prasetyo <endri.p...@gmail.com>:

> Dear Experts,
>
> Anybody can advice please, when we use low hydrogen type electrode for

> *steel
> structure* welding erection (SMAW process) does it require to be baked all

> the time @70 C deg on work station?
> Is it acceptable when the welder only keep the electrode into the portable
> oven without baking (after issued from holding oven) although it is a not
> best practice?
> For information, the material of the steel structure is carbon steel Q235.
>
> Appreciate your sharing. Thanks.
>
> Regards,
> Endri
>

[muthu barathi]

Hi,

Just understand the clear funda behind the low hydrogen electrodes.

1. First re dry as per manufacturer's recommendation such as 250 deg C for 2
hrs etc and after reaching the recommended temperature it shall hold for the
period say 2 / 3 hrs as per mfrs. recommendations.
2. then transfer to holding oven which shall at least 100 - 120 deg C for 24
hrs.
3. From holding oven transfer required quantity of electrodes to the portable
oven (quiver) for site welding and keep it at least 70 deg C.
4. If due to any reasons power cut more than 4/5 hrs then again re bake but it
shall not more than 3 times otherwise the flux may get spoiled and welding
defect arise.


On Fri, 09 Dec 2011 18:19:32 +0530 wrote

>Low hydrogen electrodes must be baked in mother oven at 250-300 degree C for 2

hrs. The carry oven is formaintainingthe temperature of maximum 100 degree C.

The Low hydrogen electrodes are very sensitive to the moisture and can inject
hydrogen to the weld and can affect the weld zone results in hydrogen induced
crack , that's it should must.


On Thu, Dec 8, 2011 at 2:24 PM, Endri Prasetyo

wrote:

Dear Experts,

Anybody can advice please, when we use low hydrogen type electrode for steel
structure welding erection (SMAW process) does it require to be baked all the
time @70 C deg on work station?
Is it acceptable when the welder only keep the electrode into the portable oven
without baking (after issued from holding oven) although it is a not best
practice?


For information, the material of the steel structure is carbon steel Q235.

Appreciate your sharing. Thanks.

Regards,
Endri




--

To post to this group, send email to material...@googlegroups.com

To unsubscribe from this group, send email to materials-

welding+u...@googlegroups.com

For more options, visit this group's bolg at http://materials-
welding.blogspot.com/

The views expressed/exchnaged in this group are members personel views and
meant for educational purposes only, Users must take their own decisions w.r.t.
applicable code/standard/contract documents.






--
>
To post to this group, send email to material...@googlegroups.com
>
To unsubscribe from this group, send email to materials-

welding+u...@googlegroups.com

>
For more options, visit this group's bolg at http://materials-
welding.blogspot.com/
>
The views expressed/exchnaged in this group are members personel views and
meant for educational purposes only, Users must take their own decisions w.r.t.
applicable code/standard/contract documents.
>

Dear Sir,





Thanking You,

Honesty is the best Policy

With Warm Regards,

Muthu Barathi P
Mobile No:00962788269821 (Jordan)
00962775401951

Follow Rediff Deal ho jaye! to get exciting offers in your city everyday.

[I.K.Inspection Services]

Dear all,

 

         I would like to add small comments addition to Mr Kaja, Baking and holding is not required if the electodes used directly from vacuum packed carton which is manufacturer package.

 

regards

IK

[Sundaram Elumalai]

Gents,

 

I have interesting event. One of the client is expecting and interpreting the temperature 60 degree C  must be on Electrodes. So now we are increasing the Quiver temperature nearly 100 degree C to reach the Electrodes temperature to 60 degree. But we are not sure about this concept. We are trying to satisfy my Client.

 

But apart from the above, All the Electrodes manufacturer confirmed that the Quiver must be heated condition at least 80 Deg C to ensure the electrodes will not pickup any moisture.

 

So you need follow the Manufacture recommendation unless you do not have client spec which is asking something stringent.

 

With Kind Regards,

 

Malai

---

******************************************************************************************
CONFIDENTIALITY NOTICE
This e-mail and any attachment are confidential and may be privileged or otherwise protected from disclosure. It is solely intended for the person(s) named above. If you are not the intended recipient, any reading, use, disclosure, copying or distribution of all or parts of this e-mail or associated attachments is strictly prohibited. If you are not an intended recipient, please notify the sender immediately by replying to this message or by telephone and delete this e-mail and any attachments permanently from your system.