Welded nose rail used for crossing

DETAILED DESCRIPTION OF THE INVENTION The present invention will be apparent from a reading of the following description in connection with the embodiment shown in the accompanying drawings.
EXAMPLE 1 FIGS.
1A and 1B are plan views illustrating the whole welded nose rail for crossing of Example 1 produced according to the method of the present invention and a longitudinal central section view of said nose rail, respectively.
In this example, a pair of rail members 1 having the same cross section as an ordinary rail are used and joined with each other to be symmetric with respect to the longitudinal center line.
The material is a high carbon steel rail material containing 0.
70 to 0.
82% by weight of carbon.
Electron beam welding is used to join said rails and backing material 2, extending in the longitudinal direction, is interposed at the stem point of said pair of rail members 1, 1.
The backing material 2, as shown in FIG.
1B, has a narrow width from the front point A to the bending point D--D and a larger width from the bending point to the back.
The top and bottom end parts of the backing material 2 extend from the hollow stem part 1c of the rail members 1, 1 to the joint of the head part 1a and the joint of the base part 1b and is contacts to or is held between them.
At the point G--G where the rail members 1, 1 branch into two, the backing material 3 is contacts only the joint of the base part 1b of the rail member 1 extends in the longitudinal direction.
On the other hand, the I-shaped bevel is formed at the joint of the head part 1a and base part 1b of said rail member 1 and electron beam welding is conducted along the bevel extending on the longitudinal center line.
Said electron beam welding is usually conducted according to the following work flow.
The whole face of the bevel of the rail and the part around it are first degreased and cleaned.
A pair of rails and a backing material are then constructed and fixed with a jig, the whole assembly being preheated to 400.
degree.
C.
in a preheating furnace