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During the complete premachining of the piston, all cracked and burnt areas are machined away. Lifting holes are drilled out. The piston is preheated to 200C. Then Built up by submerged arc process. Temperature is maintained until welding is complete. Immediately after, the piston is stress relieved at a temperature appropriate for the material used.

The piston crown is then premachined according to specifications of engine makers, then hard chrome plated on ring grooves and ground to engine makers' specifications.