The present invention relates to a sheet for forming a hard coating and a method of formation. In a joined structure of different metals, members of different metals are joined to each other in such a manner that a flange is allowed to extend in a direction from the circumferential side of one of the members along the circumference of the other member. The candidate check data is evaluated for a match against at least one of existing check data for the selected location or check data associated with a related location.