Patent ID: 6163011
Filing Date: 2000-12-19
Classification: B23K,F02M,Y10T

Abstract:
A laser-welded structure of metal members, comprising:a first member and a second member of metal materials of different kinds which are overlapped one upon the other, and a melt-solidified portion formed by the irradiation with a laser beam and arriving at said second member from the surface of said first member penetrating through said first member; whereinsaid melt-solidified portion has nearly an inverted triangular shape in cross section with its width becoming gradually narrow from the surface of said first member toward the inside thereof, and has a low-hardness layer on the front surface side of said melt-solidified portion and a high-hardness layer on the inside thereof; andsaid high-hardness layer has a structure in which first layers and second layers having a hardness smaller than that of said first layers are alternatingly laminated in a direction in which the welding proceeds.