Storing and Redrying Electrodes


1. Scope 

Covered arc welding electrodes, manufactured by Lincoln Electric Europe, delivered in their original packaging.
The packaging consists of either:
A cardboard boxes in outer carton;

B foil protected cardboard boxes in outer carton;

C plastic (PE) boxes with sealed cap, suitable for reclosing;

D hermetically sealed metal tin (LINC CAN™) in outercarton;

E hermetically vacuum sealed foil packs (MINI-PACK) in outercarton;

F hermetically vacuum sealed foil packs (Sahara ReadyPack®) in outer carton.

    

 

Packaging type ​ ​ ​ ​ ​
​Electrode grades​A​B​C​D​E​F
​​Mild steel​XX​​XX​X​
​Low alloy high strength steel​X​X​X
​Low temperature fine grain steel​XX​​X​X
​Creep resistant steel​X​X
​Stainless steel​X​X​X​X​X
​Duplex and Superduplex stainless steel​X​X
Nickel base electrodes​X​X
​​Hardfacing, maintenance and repair electrodes​X

 

2. Storage

2a. Storage of electrodes in cardboard boxes requires humidity and temperature controlled storage areas.
General recommended storage conditions include:
- temperature 17-27°C, relative humidity ≤60%
- temperature 27-37°C, relative humidity ≤50%.
- electrode boxes may be stored in layers to a maximum of 7.

2b. Plastic boxes require storage conditions suitable to cardboard boxes

2c. No temperature and humidity requirements are applicable for electrodes in Linc-Can Mini-Pack and Sahara ReadyPacks, providing that (vacuum) seal is present in undamaged packs.
General recommended storage conditions include:
Sahara ReadyPacks & Mini-Pack in outer cartons may be stored in layers to a maximum of 7;
Linc Can in outerboxes may be stored in layers to a maximum of 5;
Prevent damage and heating above 60°C for Linc-Can and Sahara ReadyPacks;
Prevent damage and heating above 40°C for Mini-Pack.

 

3. Handling

3a. Re-drying and subsequential holding, as recommended in table 1, is required for products in the following conditions
rutile electrodes, being humidified for any reason;
basic low hydrogen electrodes in cardboard boxes;
basic low hydrogen electrodes, returned from shop floor or damaged Sahara ReadyPacks, Mini-Pack or Linc Can;
stainless steel and Ni-base electrodes after long and unknown storage conditions (deviating from recommendations);
Wearshield electrodes in plastic (PE) boxes, stored for more than 1 year under conditions as described under section 2a. or earlier when the condition deviates from those recommended.

3b. Electrodes in Sahara ReadyPack and Linc-Can can be used without re-drying, providing that vacuum or seal is present in the undamaged packaging. The electrodes can be consumed in the as received condition, direct from the packaging within a period of 8 hours after opening under the conditions of ≤35°C and ≤90% RH, with the electrodes remaining in the opened packaging and protected against excessive conditions as condensation, rain, etc. This time can be extended to 12 hours under the conditions of ≤27°C and ≤70% RH. Once opened Linc-Cans should be closed during welding operations using the plastic lid that is supplied with the tin. If vacuum or seal is not present, the electrodes shall follow the re-dry and holding procedure as recommended in table 1 for the
EMR-Sahara® Range. Electrodes in Mini-Pack can be used without re-drying, provided that the vacuum is present in the undamaged packaging. The electrodes can be consumed in the as received condition, direct from the packaging within a period of 4 hours after opening under the conditions of ≤35°C and ≤90% RH, with the electrodes remaining in the opened packaging and protected against excessive conditions as condensation, rain, etc

Redrying and holding recommendations

 Covered electrodes that have suffered from serious water and moisture contamination, or have been exposed to the atmosphere over long periods of time cannot be restored in their original condition and should be discarded.

  Electrode product group

 Redrying Time (H) *

Temperature
(°C)

Holding

Mild steel:
- rutile E6013
- rutile E6012, E7024

 

0.5-1h
1-2h

 
70-80
100-120

 

Cabinet 10-20°C above ambient temperature

 

- basic low hydrogen (HDM <8 ml/100g)
- basic very low hydrogen*

2-6h
2-6h
250-375
325-375

 

a. holding oven unlimited time at 120-180°C
b. quiver max. 10h at RT-125°C (see illustration fig. 1)
c. plastic (PE) box (RepTec and Wearshield electrodes) max. 2 weeks workshop conditions

Low alloyed:
- basic very low hydrogen**

2-6h

   325-375

Hardfacing (Wearshield) & Maintenance & Repair (RepTec) electrodes

Stainless steel:
- non EMR-SAHARA electrodes
- EMR-SAHARA range

 
1-6h
1-6h
 
200-300
125-300

Holding oven unlimited time at 75-125°C quiver max. 10h at RT-125°C

Ni-base 1-6h 200-300

* Redrying can be repeated twice within the indicated max. time of 6h. Redrying of electrodes should be carried out by taking them out of the packaging and place the electrodes in approx. 3cm thick layers in a temperature controlled air-circulation oven.

** If these EMR-SAHARA electrodes are redried a maximum hydrogen content HDM of max. 5ml/100g is valid

 

 Storing and redrying non-low hydrogen electrodes.


 

More info

Storing and handling instructions for stick electrodes

Stick electrodes packaging options