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 <jijilalkm@gmail.com> wrote:
From: jiji lal <jijilalkm@gmail.com>
Subject: [MW:17372] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE
To: materials-welding@googlegroups.com
Date: Saturday, 13 April, 2013, 10:36 AM
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. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm 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. --- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
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