Fw: [MW:18061] Tapered burning of MMA electrode

 

 

 

 

 Before deciding on the source of the problem,

1.  Change the electrode to 180 ⁰ in the holder and weld . If the tapering occurs  on the       

      same side / area (as in earlier case) while burning,  then it could be a manufacturing

      problem.

 

     If it is on the opposite side, then it could be due to wrong holder / travel angle used  

     during welding. The welder has to change or use proper  holder angle (or)  practice

     to overcome the problems.

 

2.  If the tapering occurs on the same side / area, in spite of 180⁰ rotation in the holder

     it could be due to worn out die used by the manufacturer or drilled hole  in the die not

     meeting the specifications of coating thickness.  It is nothing to do with binders used for  

     bonding the flux  chemicals to the core.
 

     In this case, you can return the entire lot and ask for free replacement.

 

3.  Tapered burning  is a common problem in SS and sometimes  with  MS  (E 6013) 2.40

      mm   size electrodes also. One way to overcome the problem is to use medium coated

      electrode in place of light (flux) coated type. 

 

      E 308-17,  E xxx-17 series SS electrodes with same chemistry  has this extra  thickness  

      of  flux coating  comparatively and also provides straw / golden yellow (or)  light silver

      finish colour weld bead , in place of bluish colour normally associated  with SS  electrode        

      welding which is due to use of excessive current.

 

      These electrodes also does not require any post dressing or grinding.

 

Sridhar.