D842 cobalt-based alloy electrodes standards in line with GB EDCoCr-D-03 rather AWS ECoCr-D D842 cobalt-based alloy electrode Description: Cobalt based on the 4th carbon cobalt-based chromium tungsten alloy core welding electrodes, DC reverse, deposited metal at 800 ℃ can still maintain good thermal fatigue resistance and corrosion resistance. D842 cobalt-based alloy electrodes purposes: to withstand high temperatures of hot and cold shock and staggered workpiece welding, such as forging dies, valve sealing surface, with good performance. D842 cobalt-based alloy electrode deposited metal chemical composition /% C 0.5-0.5 Si≤2 Mn≤2 Cr 23-32 Fe≤5 W≤9.5 other ≤7 the balance of Co D842 cobalt-based alloy electrode surfacing hardness HRC: 28 -35 more than the chemical composition and hardness at room temperature refers to three or more surfacing welding metal. D842 cobalt-based alloy electrode reference current: AC or DC D842 cobalt-based alloy electrode wire diameter (mm) 3.2 4.0 5.0 D842 cobalt-based alloy electrode welding current (A) 90 ~ 130 140 ~ 170 170 ~ 200 D842 cobalt-based alloy electrode Caution : 1. 150 ℃ before welding electrodes shall be baked for one hour. 2. In order to avoid cracks, according to the workpiece size and the type of the base material shall be preheated 200 ~ 400 ℃ of. And should be low current short-arc welding. After welding the workpiece should be immediately placed in the drying and preheating of sand or kelp in the slow cooling cylinder. 3. Since arc welding temperatures relatively high, so the dilution rate is relatively large welding, it is generally difficult if only in order to improve the welding or arc welding efficiency considerations were.