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Tuesday, December 23, 2014

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General Welding Safety

Storage of Welding Electrodes

I.S Classification (IS 814-04)

AWS-Classification

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The place where electrodes are stored should have relative humidity below 50% and normal room temp say 30-350C these are ideal conditions. It is also necessary that electrodes are stored in a separate area where oil grease and other similar hazardous items are not stored.

Higher humidity results in absorption of moisture by electrode coverings. This mositure is the source for hydrogen. As we all know hydrogen can have adverse effects on weldments. For this reason proper storage, handling and conditioning of electrodes is necessary. AWS/A 5.1 recommends the following storage conditions.
 

S. NO

AWS Class

Temp

Relative Humidity

i)

E6010

Ambient

. . . .

ii)

E6012, E6013,E7016, E7018 etc

300C +100C

Max 50%

Electrode manufacturers provide a certain degree of moisture resistant packing by using polythene bags. Number of bags used per packet vary from 1 to 3 depending upon the type of covering and the permissible limit of moisture content in the flux coating.

Coating moisture content requirements have been specified in AWS/A5.1 & 5.5 which are reproduced here.
 

AWS Class
(As per AWS/A 5.1 & 5.5)

COATING MOISTURE
Maximum percentage (after reconditioning)

E 7016. X
E 7018. X

0.40

E 8016. X
E 8018. X
E 9018. X

0.20

E 10018. X
E 11018. X

0.15

Since the possibility of mositure pickup in transportation and storage can not be totally eliminated, there is a need for redrying and rebaking of electrodes before use.

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