storage & handling welding consumables

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Avesta Welding AB, P O Box 501, SE-774 27 Avesta, Sweden Tel +46 (0)226 85700 Fax +46 (0)226 85718 www.avestawelding.com Storage and handling Rev. February 2010 Storage and handling recommendations for covered electrodes, flux-cored wire and fluxes Moisture pickup can be harmful for stainless steel covered electrodes, FCW and fluxes. Although consumables from Avesta Welding are supplied in moisture resistant packages, the precautions and measures given below are still recommended. Storage Covered electrodes, FCW and fluxes should be stored in their unopened and undamaged original packaging. Failure to do this may seriously reduce the durability of the consumables. Storage times should be kept as short as possible. The “first in – first out” principle should be observed. Neither covered electrodes nor flux should be stored for more than 5 years. Products over 5 years old should be redried before use. FCW should not be stored for more than 2 years. Please contact Avesta Welding if unsure of the production year. Avesta Welding rarely ships any consumables over 3 years old. Moisture is carefully checked before supplying such consumables. Covered electrodes and flux should not be stored in direct contact with floors or outer walls. Storeroom temperature should be kept as even as possible (+/5°C variation). It should not be below 15°C. Relative humidity should not exceed 50%. Reusing fluxes Flux for reuse must be kept free of moisture and oil. These may be present in the compressed air used to circulate the flux. To maintain the properties of the flux, new flux should be regularly added. A rule of thumb is at least one part of new flux to three parts of reused. Foreign matter such as slag, grindings, etc. must be removed (sieving is appropriate). Handling of opened packages Whenever possible, welding should be carried out at room temperature and low relative humidity. Consumables removed from storage should be used as quickly as possible (ideally, never more than one day after removal). Between shifts, it is advisable to reseal unused electrodes or hold them at 60 – 70°C in a constant temperature, well ventilated oven. Relative humidity should not exceed 50%. Between shifts, unused welding flux should be removed from the welding machine and kept in an oven at 60 – 70°C. If relative humidity exceeds 55%, FCW should never be left unprotected for more than 24 hours. Handling of electrodes in the welding area Electrodes should be kept as dry as possible when they are being used. If the climate so demands, they should be kept warm in a thermocontainer or similar. Another solution is to use vacuum sealed “Extra Dry” packs. Redrying Electrodes slightly affected by moisture may be rebaked for approx. 3 hours at 250 – 280°C. Heating and cooling should be carried out slowly. Electrodes can be rebaked up to three times with no danger of damaging the coating. Fluxes slightly affected by moisture may be redried for 2 hours at 250 – 300°C. FCW slightly affected by moisture may be redried for 24 hours at 150°C. Note The consequences of moisture pickup are not as serious for stainless steel electrodes as they are for mild steel electrodes. Hence, any system for handling the latter is also suitable for stainless steel electrodes.

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Storage & Handling Welding Consumables

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Page 1: Storage & Handling Welding Consumables

Avesta Welding AB, P O Box 501, SE-774 27 Avesta, Sweden ▪ Tel +46 (0)226 85700 ▪ Fax +46 (0)226 85718 ▪ www.avestawelding.com

Storage and handling Rev. February 2010

Storage and handling recommendations for covered electrodes, flux-cored wire and fluxes

Moisture pick‐up can be harmful for stainless steel covered electrodes, FCW and fluxes. Although consumables from Avesta Welding are supplied in moisture resistant packages, the precautions and measures given below are still recommended. 

Storage

Covered electrodes, FCW and fluxes should be stored in their unopened and undamaged original packaging. Failure to do this may seriously reduce the durability of the consumables. 

Storage times should be kept as short as possible. The “first in – first out” principle should be observed. 

Neither covered electrodes nor flux should be stored for more than 5 years. Products over 5 years old should be redried before use. 

FCW should not be stored for more than 2 years. 

Please contact Avesta Welding if unsure of the production year. Avesta Welding rarely ships any consumables over 3 years old. Moisture is carefully checked before supplying such consumables. 

Covered electrodes and flux should not be stored in direct contact with floors or outer walls. 

Storeroom temperature should be kept as even as possible (+/‐ 5°C variation). It should not be below 15°C. Relative humidity should not exceed 50%. 

Reusing fluxes

Flux for reuse must be kept free of moisture and oil. These may be present in the compressed air used to circulate the flux. 

To maintain the properties of the flux, new flux should be regularly added. A rule of thumb is at least one part of new flux to three parts of reused. 

Foreign matter such as slag, grindings, etc. must be removed (sieving is appropriate). 

Handling of opened packages

Whenever possible, welding should be carried out at room temperature and low relative humidity.  

Consumables removed from storage should be used as quickly as possible (ideally, never more than one day after removal). 

Between shifts, it is advisable to reseal unused electrodes or hold them at 60 – 70°C in a constant temperature, well ventilated oven. Relative humidity should not exceed 50%. 

Between shifts, unused welding flux should be removed from the welding machine and kept in an oven at 60 – 70°C. 

If relative humidity exceeds 55%, FCW should never be left unprotected for more than 24 hours. 

Handling of electrodes in the welding area

Electrodes should be kept as dry as possible when they are being used. If the climate so demands, they should be kept warm in a thermo‐container or similar. Another solution is to use vacuum sealed “Extra Dry” packs. 

Redrying

Electrodes slightly affected by moisture may be rebaked for approx. 3 hours at 250 – 280°C. Heating and cooling should be carried out slowly. Electrodes can be rebaked up to three times with no danger of damaging the coating. Fluxes slightly affected by moisture may be redried for 2 hours at 250 – 300°C. FCW slightly affected by moisture may be redried for 24 hours at 150°C. 

Note

The consequences of moisture pick‐up are not as serious for stainless steel electrodes as they are for mild steel electrodes. Hence, any system for handling the latter is also suitable for stainless steel electrodes.