Description: D628 is a graphite type coating Abrasive high carbon high chromium cast iron welding electrodes. Surfacing layer of high carbon high chromium cast iron type Ni bulk carbide, overlay, high hardness, but more brittle, stressed and less able to impact loads, Abrasive wear in order not to affect performance, as far as possible small current, in order to facilitate overlay the orientation of the hard phase crystallization. 

 Uses: surfacing to withstand minor impact load, but requires a good anti-wear performance in abrasion resistant surface, such as the Hammer hammer mill, coal mill fan impact panels. 

 Welding metal chemical composition (%) 

 C 
 Cr 
 Mo 
 V 

 3 to 5 
 20 ~ 35 
 4 to 6 
 ≤ 1 


 Surfacing layer hardness: HRC ≥ 60 

 Reference current: 

 Electrode diameter (mm) 
 3.2 
 4.0 
 5.0 

 Welding current (A) 
 90 ~ 120 
 150 ~ 180 
 180 ~ 220 


 Note: 1, before welding electrodes shall be baked about 200 ℃ 1h. 

 2, welding parts must be 400 ~ 600 ℃ preheating, and rust on the workpiece, oil, etc. cleaned further surfacing. 

 3, the length of each surfacing of not more than 50 ~ 70mm is appropriate. 

 4, after welding, the workpiece should be tempered at 600 ~ 700 ℃ 1h and then slow cooling, or the workpiece immediately put into dry and warm in the sand box or kelp slow cooling.