D237 in line with GB / T 984 EDPCrMoV-A1-15 Description: D237 is a low hydrogen sodium type coating of chromium molybdenum vanadium type welding electrodes, DC reverse. Use: welding by sediment wear and cavitation damage to irrigation machinery, dredging bucket, mining machinery parts. Deposited metal chemical composition (%) C Cr Mo V other elements of total guaranteed value of 0.30 ~ 0.60 8.00 ~ 10.00 ≤3.00 0.50 ~ 1.00 ≤4.00 Example value 0.35 9.70 0.15 0.65 - Surfacing layer hardness: HRC≥50 reference current ( DC +) Electrode Diameter (mm) f3.2 f4.0 f5.0 welding current (A) 90 ~ 110 140 ~ 180 180 ~ 220 Note: 1. Welding electrodes shall be subject to about 250 ℃ baking 1h. 2. Before welding large parts should be properly preheated to about 300 ℃, and welding parts of the surface rust and oil are removed.