Re: [MW:17383] PRE HEAT PROCEDURE OF E 7016 -1 ELECTRODE

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

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.

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