D217A in line with GB / T 984 EDPCrMo-A3-15 Description: D217A is a low hydrogen sodium type coating CrMnMo type welding electrodes, DC reverse. Uses: mainly used for welding high-strength wear-resistant parts. As 30CrMnSi and 35CrMnSi metallurgical Roll welding and repair, ore crusher parts, mining 4m3 electric bucket teeth and other excavator bucket teeth welding and the like. Deposited metal chemical composition (%) C Cr Mo guaranteed ≤0.50 ≤2.50 ≤2.50 Surfacing layer hardness: HRC≥40 Reference Current (DC +) Electrode Diameter (mm) f3.2 f4.0 f5.0 Welding current (A ) 90 to 110 140 to 180 180 to 220 Note: 1. Welding electrodes shall be subject to 350 ~ 400 ℃ baking 1h. 2. Before surfacing large preheated to about 200 ~ 300 ℃, and welding parts of the surface rust and oil are removed.