Patent ID: 8172125

Claim:
A vehicle door frame including a first door frame member and a second door frame member which are made of light alloy and positioned end-to-end to be butt-welded to each other, wherein each of said first door frame member and said second door frame member comprises: a design part; an enclosed section provided on a vehicle interior side; a connecting part which connects an inner surface of said design part with said enclosed section; and a first dam protrusion and a second dam protrusion which project from the inner surface of said design part and are positioned on opposite sides of said connecting part, respectively, said first dam protrusion, said design part and said connecting part defining a first space therebetween and said second dam protrusion, said design part and said connecting part defining a second space therebetween, wherein ends of said first and second dam protrusions of said first door frame member and corresponding ends of said first and second dam protrusions of said second door frame member are respectively butt-positioned against each other when said butted ends of said first door frame member and said second door frame member are joined to each other by butt-welding, and wherein molten metal is present in said first space and said second space after said molten metal has melted and passed through the inner surface of said design part from the outer surface thereof upon butted ends of said first door frame member and said second door frame member being butt-welded to each other from the outer surface of said design part.