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This performed work presents a subject rarely addressed in Brazil, the repair of tool steel for cold forming, in specific AISI D6 tool steel. This steel is the forming die’s constituent material of pressure vessels of the company Schulz S/A. The proposed methodology for the tests was based in studied concepts according to regulatory standards for welding processes, specified books, articles related to, where a consensus among those reasons would set the parameters for steel repair. Experimental tests were done, where some variables had to be taken into account to get the best result and the least cost to the company. Finally results were discussed and due to a restricted analysis, the best repair condition was applied in a cover punching die, whose work is in conformation.