+ Tolerance of the side surfaces of rail top = ±0.4mm compared with the main rail.
+ The alignment tolerance of the bottom of rail sole = ±0.4mm.
+ Tolerance of the rail web including under rail top, rail web, top of rail sole, 2 surrounding lines of the rail = ± 4mm or less. It is not permitted to make the main rail concave.
+ Partially concavity of the rail surface is 0.25mm.
6.1.4.2 Checking by colors :
- Wipe out welding joint by cleaning garment.
- Spray regularly re-absorbable liquid on the surrounding line of the welding joint. Wait for about 5-10 minutes. This liquid is highly absorbable: easy to be wiped out, luminescent at normal temperature, difficult to burn. During the above time, the liquid will penetrate into the cracks.
- Use a cloth dipped in green washing liquid to wash the red liquid on the surface of the welding joint. The washing liquid is strong. It can wash out absorbable, neutral, non-disintegrated, luminous substances. This liquid shall not wipe out the liquid penetrated into cracks.
- Spray regularly a thin layer of white visible liquid on the surrounding line of welding joint. This white liquid can remove the penetrated liquid. This liquid combines with the absorbable liquid shall be luminous to show the defects of the welding joint.
6.1.4.3 Magnetic checking (this method shall be applied after checking by colors):
- Wipe out the surface of the welding joint by a dry cloth.
- Put the magnetic machine on the surface of the welding joint and then operate the machine.
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