1. Overhead Crane rail joint seam, general is 1 ~ 2 mm, installed in cold areas or when the temperature is lower than the perennial use temperature and differ in more than 20 ℃, temperature compensation gap should be considered, it is advisable to take 4 ~ 6 mm.
2. Crane rail can be joint with straight head, also can be made into 45 ° Angle bevel joint, inclined joint can make the wheel in a smooth transition joint.
3. Two rail lateral joint dislocation and height difference shall be less than 1 mm.
4. Preparation before welding. Before the crane rail welding joint, carefully clean up the groove and the nearby oil contamination, rust, etc, until metallic luster.
5. Welded rail connection sequence is from bottom up, after the first rail waist rail, rail head, one by one step by step a way for surfacing, around the last repair.
6. The matters needing attention in the process of crane rail welding.
In each layer of welding when the wave, especially in the welds crane rail bottom of each layer of welding wave, should use one finish electrode welding, avoid or move between electrode and arc breaking, 2 layer before and after welding the welds should be the opposite direction of the wave; Each crane rail joint welding work shall be carried out continuously, in order to keep the end of the rail welding at high temperatures (300 ℃ ~ 350 ℃). After welding, when the eliminating stress before has not been cooling after heat treatment, must prevent the rain wet; Heat the copper plate can be removed with water cooling, in order to use the next time.
7. Rail connection smooth processing
Crane rail welding joint is eliminating stress after heat treatment and cooling to the atmospheric temperature, the track on the surface of the top and sides of weld smooth processing. When welding bulge is too large, with a grinding wheel polishing machine polishing processing, until flush with rail head, finally will surface grinding.
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