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Device for electric welding of metal (am, in which the two helicoidal guide to be welded first of all under carry out of a current and brought together to form of an electric arc to be separated again, in order then to achieve of the welding pressure to be pressed against one another again
Device for electric welding of metal (am, in which the two helicoidal guide to be welded first of all under carry out of a current and brought together to form of an electric arc to be separated again, in order then to achieve of the welding pressure to be pressed against one another again