Portfolio Storage&Drying Control Procedure

8/10/2019 Portfolio Storage&Drying Control Procedure

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ELECTRODE Storage and Drying Control Procedure

1. Scope

Defining the responsibilities and procedures for the storage, drying, issue and returnof all welding materials for the Project.

2. Application

This procedure establishes the methods used by the Company to ensure that weldingmaterials are properly stored, issued and returned.

3. Definitions

The welding terms used in this procedure will be interpreted in accordance with thedefinitions given in the latest edition for welding terms and definition of EN/ASME.

4. Control Method4.1 Storage and Drying4.1.1 All welding materials will be stored in their original containers until taken to

the field. Cellulose-coated electrodes should be kept apart from low-hydrogen basic electrodes. If possible, the packs of electrodes should betaken out of storage in the sequence in which they were received.

4.1.2 Storage and drying conditions for welding electrodes are in accordance withFig.1 for low-hydrogen electrodes, and Fig.2 for cellulose-coated electrodes.And Rutile.

4.1.3 Low-hydrogen basic electrodes should be re-dried before use (1 st re-dryingcycle) in the baking oven at 350 C, for about 3 hours (not needed forVacum Pac ). When the electrodes are initially placed in the baking oven,the temperature should not be greater than half the re-drying temperature

(170 C). The electrodes should be held at that temperature for hourbefore heating the electrode to the final temperature. The re-drying time ismeasured from the point at which the re-drying temperature has beenreached (350 C). Do not stack more than four layers of electrodes in thebaking oven. Cellulose electrodes must not be re-dried.


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4.1.4 Re-drying electrodes will be placed in the holding oven (Fig.1) at a steadytemperature of approximately 150 C. This intermediate storage is aimed atavoiding moisture pick-up in the coating of low-hydrogen electrodes.Storage in the holding oven (Fig.1) should not exceed 10 days maximum

total holding time.

4.1.5 The remaining basic electrodes from the field should be re-dried at 300 Cfor about 2 hours, in accordance with Clause 4.1.3. The total number of re-drying cycles will be limited to three (3) cycles, as outlined by Fig.1. If, bymistake, during the re-drying process, the time exceeds 10 hours, the basicelectrodes will be discarded.

4.1.6 Electrodes which remain unused after the 3 rd re-drying cycle will bediscarded.

4.1.7 Basic electrodes, having a low-hydrogen coating, will be taken out and heldin heated quivers, which are kept at about 100 C. Only sufficient electrodes

will be given to welders, i.e. in quantities that may be consumed within thesame working day. Remaining basic electrodes will be returned first to theholding oven (Fig.1), and then to the baking oven in accordance with Clause4.1.5.

4.1.8 For cellulose-coated electrodes, exposure to air moisture and excessivedifferences in temperature should be avoided. Open packs of celluloseelectrodes should be returned to the store and kept up to the next day in theholding oven (Fig.2) at a temperature of 40 to 50 C (Fig.2).

4.1.9 The store operator should check the baking and holding oven temperaturesat the start and finish of each day, as well as the number of re-drying cycles

for basic welding electrodes.

The number of re-drying cycles shall be controlled by paint-marking thestud-end of returned electrodes as follows:1. 2nd re-drying cycle white paint on electrode stub-end.2. 3rd re-drying cycle red paint on electrode stub-end.


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4.2 Issue from the Store4.2.1 At the beginning of each day, the welding foreman will select the size, type

and quantities of consumables required according to applicable weldprocedures. He will ensure that welders are issued with the correct size, type

and quantities in accordance with the applicable welding procedurespecification.

4.2.2 Welders should be supplied with electrodes in quantities that may beconsumed within the same working day.

4.2.3 The welding foreman will ensure that the low-hydrogen electrodes to beused are removed from the holding oven (Fig.1) and placed directly into the

welders heated quivers.

4.2.4 The welders will plug the quivers up on arrival at the welding location, assoon as the generators are turned on. The quivers will be set at a constanttemperature of approximately 100 C. The quivers cover should beconstantly closed during welding.

4.3 Return to Store4.3.1 At the end of each day, the welding foreman will ensure that all the unused

low-hydrogen electrodes are returned to the store. All low-hydrogenelectrodes will be re-dried in accordance with Clause 4.1.5. Electrodesshould not be left into the quivers at night.

4.3.2 At the end of each day, the welding foreman will ensure that all unusedcellulose electrodes are returned to the store and placed in the holding oven(Fig.2), in accordance with Clause 4.1.8, until required for production.

4.3.3 The welding foreman should examine all returned and unused welding basicand cellulose electrodes to make sure that any wet or damaged items arediscarded. Different types of electrodes should not be placed in the sameshelf.


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4.4 Inspection4.4.1 All electrodes whose coating is damaged or tainted with grease, oil, moisture

or paint should be discarded by the welding foreman and welders.

4.4.2 The Quality Control Department will periodically check the site forcompliance with the requirements of this procedure. Site management willbe informed in writing of audit results, including any deficiencies found. Anon-conformity report will be issued if procedures are not followed.

Approved by Q.C. Manager: Date:

BACCHINI LUCIANO

Receiving Welding Foreman: Date:

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Portfolio Storage&Drying Control Procedure