PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE

[jiji lal]

SIR,

I'm engaged with welding of API 5LX 80  grade pipeline for regassified LNG transmission . We do  Tie-in method using SMAW+FCAW.

For root pass welding we use E7016-1 electrode after pre heating 250 degree for 2 hr in mother oven and maintain 100 degree in holding oven . during RT interpretation severe hollow bead and porosity observed in root .hence PMC sent almost all joints for repair.now it becomes a serious issue and I think ,the pre heat method was not proper. kindly advice me in this issue.

Mr.Jijilal k .m

qa/qc dept. tecpro ltd.

kochi.

[Srini Vasan]

Dear,

        Do you have Approved consumable Control procedure from your client? then, if you follow the Preheat method as per procedure then no need to worry..check the cause problem,,you will find any way.

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With Best & Regards

N.Srinivas,

Welding Inspector,

Al Suwaiket Industrial Support Services,

0561198050,0537812787

Al-Khobar.

[c sridhar]

Mr. Lijilal,

a. Please check up the date of manufacturing of the electrode. Generally up to 12 months is OK, but not for

    xay quality welds. 6 months  from manf. date should be better.

b. Dry the electrodes at 300 deg. C  for min. 2 hrs and not the total duration.

c. If required dry them at 350 deg. C for 1 hour and see the results. may be it should be OK.

d. Change the brand if it is also  not working  out.

Sridhar.

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From: jiji lal <jiji...@gmail.com>
To: material...@googlegroups.com
Sent: Saturday, 13 April 2013 10:36 AM
Subject: [MW:17372] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE

[Nandesh Kumar]

Check/try the following: As far as consumables are concerned: Bake (not preheat!) the electrodes, as per the manufacturer's recommended duration. Ensure the numbers 250, 100 what you have mentioned are not in ° F !! it should be ° C. If Vac-Pac electrodes are used, do not bake. Check baking oven, holding oven and quivers are properly calibrated. Limit the number of rebaking cycles to manufacturer recommendation. Check the shelf-life of electrodes with the manufacturer. Others:  If pre heat is needed, before welding, check the pre heat of base metal is done properly, using approved procedures. Ensure the cleanliness of the area to be welded.(face, bevel, inside, outside for 1" minimum) Ensure sufficient wind protection is provided during welding. Ensure qualified welders are being used. Ensure approved WPS is being used. Above mentioned are 'generalized' precautions only. If you provide some more data, it can be analyzed further. ವಂದನೆಗಳೊಂದಿಗೆ / Best regards, Nandesh Kumar Arasappa P.S. : Please don't print this e-mail unless you really need to. --- On Sat, 13/4/13, jiji lal <jiji...@gmail.com> wrote:

From: jiji lal <jiji...@gmail.com> Subject: [MW:17372] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE

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[HAREESH K V]

Just to clear one doubt, may be wrong. 

Can it be because of pipe material?

May you try the consumable to weld a different/compatible base material, like SA106GrB, just on a sample piece with same welding procedure and do the radiography.

Just to confirm the issue is because of consumable itself.

Also may be the problem is because pf residual elements in the base material. Please check the MTC of pipe material.

Regards,

Hareesh K V

[vdthuan]

Hi,

You are fully complied with procedure already as you mentioned below, but I think you should check the welding condition like wind prevent,..or preheat before welding…

Wish you success

 

Best Regards,

Vu Duc Thuan

Phone: +84(0) 983 017 936

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of jiji lal
Sent: Saturday, April 13, 2013 12:07 PM
To: material...@googlegroups.com
Subject: [MW:17372] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE

 

SIR,

 

Mr.Jijilal k .m

qa/qc dept. tecpro ltd.

kochi.

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[Surendran]

Hi

I think you check the welder also wether they got do proper interpass cleaning and did the welder using a fan? And is the fan is near to the welding area. 

[james gerald]

Check whether you are complying with welding consumable manufacturer recommendation on Baking of electrodes.

 

If the answer is Yes, then check for

 

1. Whether wind protection is there by providing proper shields.

2. Whether welder is good

3. Whether base material contains mositure etc.. then m you may preheat the joint

4. whether Grease or carbonaceous material present in the base material, then do proper cleaning using some solvent

 

 

Thanks & Regards

J.Gerald Jayakumar
00968-99438165

From: vdthuan <dthu...@gmail.com>
To: material...@googlegroups.com
Sent: Monday, April 15, 2013 5:14 AM
Subject: [MW:17391] RE: 17372] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE