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AssigneeHitachi, Ltd.
InventorsTsutomu Onuma, Toshimi Matsumoto, Masami Yada, Koji Goto, Osamu Matsushima, Hideo Suzuki, Tatsuo Yonezawa, Masaki Murashita
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Method of welding a carbon steel and a austenitic stainless steel involves using high density energy beam like a laser beam or electron beam. Welding using high density energy beam is effective to obtain a high precision welding. For the purpose of obtaining both high precision and no cracks, and no deformation, the method of the invention controls the structure of a weld portion to be a mixed structure of an austenitic structure and not greater than 20 wt % of a ferritic structure.
A method of welding a base metal comprising a carbon steel to a base metal comprising an austenitic stainless steel by using a high density energy beam, which comprises employing a welding material comprising an austenitic stainless steel to provide a weld wherein at least a part of the metallographic structure of a weld portion is a mixed structure comprising an austenitic structure and not greater than 20% by weight of a ferritic structure.
Dependencies are inferred from the claim text.