Pure nickel electrode NOTES1 Welding electrodes shall be about 150 â„ƒ baking 1h. 2 For withstand stresses and shocks and other important casting structure, the electrode should not be used. 3 small thin-walled castings parts of the defects Nickel Alloy Welding Electrodes can be little stiffness without preheating welding, and general weldment to be preheated to 400 â„ƒ, insulation slow cooling after welding, the welding at a possible cutting. Description: Z238 is a low-carbon steel core, strong graphite type coating iron rod, because a certain amount of ductile agent, so that the deposited metal graphite in the cooling process spherical precipitates, both AC and DC . Uses: Used for welding ductile iron.