Patent ID: 7374823
Filing Date: 2008-05-20
Classification: B23K,Y10T

Abstract:
1. A constitution for a butt-welded portion between tubular members in which a tubular strip is arranged inside of the abutting portion, comprising: a contact portion formed on an end portion of at least one of said tubular members in contact with said strip; an inclined portion formed in series with said contact portion and inclined from said contact portion in a direction away from said strip; a stepped portion formed in series with said inclined portion and disposed at a predetermined interval from said strip; and a weld bead provided so as to entirely cover an outer surface of said contact portion and at least partially cover an outer surface of said inclined portion, so as to penetrate a part of an inner surface of said contact portion but not penetrate an inner surface of said inclined portion; wherein said contact, inclined and stepped portions are formed by a bend in said end portion.