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[MW:16383] Vacuum Packed LH Electrodes

By Materials & Welding

Dear Experts, 

We are using E 7018-1 H4 Vacuum packed Electrodes for our project. ( Refer attachments ) , where manufacturer recommendations is mentioned as : 
HD [ ml/100g] : at opening time : <5 
Working time after opening : 9h at 80% RH / 27 deg C 
After this period rebaking : 2h/340-360 deg C 
Brand : Supercito VP Medium ,Oerlikon , Air Liquide Wedling France. 
Weather Condition at site : 78- 80 % Humidity , Temp 26-30 Deg C. 

My question is :
  •  After opening packet at the start of the days work , is it necessary to transfer a pack of  electrodes to a portable quiver for holding at temp 100 deg C to prevent further moisture pick up ? or it is not required as manufacturer says that after opening up to 9 hrs it can be used at 80% / 27 deg C . 

  • Electrodes rebaking cycle depends upon which factors? Some client specifies recycling 1 time  , some 2 times ... [ As per BIS 13851:1993 , ( R 2006) - Storage & redrying of coverd electrodes  before use recommendations- 3 times ] 

Please clarify . 

Thanks & regards. 

Abhishek Ghosh 
Indonesia 

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