| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a laser welded shaped steel having a T-joint part which secures desired bonding strength and desired corrosion resistance by making a formed melting part in an appropriate shape. <P>SOLUTION: In the shaped steel, the T-joint part is formed by vertically pressing an end of a web material made of a steel plate to a flange material also made of a steel plate and is subjected to fusion-welding by one-pass irradiation of a laser beam from one side. The vertical cross section of the shape of the welded part in the longitudinal direction of the shaped steel is set to satisfy the following: a>0 mm; b>0 mm; c≥0.14Tw; d≥0 mm; e≥0 mm; a+d≤2 mm; and b+e≤2 mm, where a denotes a front melting width of the web material (welding side), b denotes a back melting width of the web material (non-welding side), c denotes a maximum melt-in depth in the plate thickness direction of the flange material, d denotes a front melting width of the flange material (welding side), e denotes a back melting width of the flange material (non-welded side), and Tw denotes the thickness of the web material. <P>COPYRIGHT: (C)2012,JPO&INPIT |
