G-TECH 301

Special basic-graphite coated electrode, formulated for welding and repairing defects in hot cast iron castings.

Lamellar cast iron.

It is the most economical solution for repairing various cast iron products, provided machinability of the weld deposit is not required and weld shrinkage stress is not a concern.

Remove the fusion crust from the weld area by machining, grinding, chiseling or suitable methods. During the repair of fusion defects, make sure to eliminate any defective parts from the base metal before welding. Completely remove grease, oil, dirt, or impurities with suitable solvents. If oil or solvents have impregnated the casting, apply heat until they volatilize; a temperature of 400 °C is generally sufficient. If there is abundant grease, immediately heat the welding surfaces to about 540 °C to evaporate the grease. Preheating is used only if necessary to avoid excessive stresses in the casting. EST electrodes are preferred at low amperage to minimize the dilution effect in the fusion zone and avoid cracks. Beads should be short and well-spaced to ensure even heat distribution, and each bead should be slightly peened. The slag produced is low, but highly alkaline; completely remove slag residues if the weld area is to be painted.