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Hobart size 3 Nickel 99 Electrodes are high-nickel-content cast iron electrodes that are ideal for light to medium weight castings. Welds are easily produced in all positions and the deposits are readily machined. AC or DC electrode positive. Preheating is mandatory. Cool slowly in still air. Size 3. Welding Processes Light to medium weight castings, Rods qty 10, Product Type Welding rod, Welding Rod Type High-nickel-content cast iron electrodes, Rod Size in. 3/32, Wire Material Cast iron w/high nickel content. Model Number: H500531-RDP. Size: 32 Inch. Age Group: Adult.