A Method of Improving the Strength of Rail Flash Welding Joint
A technology for welding joints and rails, applied in the directions of rails, laying rails, rail maintenance, etc., can solve the problems of no good prevention effect and inability to change manganese sulfide inclusions.
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Embodiment 1
[0072] The flash welding steps are as follows:
[0073] 1) Rail flash welding heating: control the welding heat input, stop heating when the welding heat input reaches 8500kJ and the joint heating reaches a certain width (about 40mm).
[0074] 2) Upsetting: Immediately upsetting, the amount of upsetting is 14mm.
[0075] 3) Push convex: When the welded joint after upset forging is still in a red-hot state, start the convex push knife in the state of electrode clamping, move from the right side of the weld to the left, and push off the convex part when crossing the weld, among which The pushing allowance at the end of the rail foot is 0.5mm, the pushing allowance within 20mm from the end of the rail foot is 1.0mm to 1.5mm and the pushing allowance at the bottom of the rail is 1.5mm.
[0076] 4) Grinding: Keep the rotation direction of the grinding wheel consistent with the longitudinal direction of the rail (that is, the rotation direction is tangent to the longitudinal direct...
Embodiment 2
[0083] The rails were welded according to the flash welding steps described in Example 1, and three sets of experiments were set up. 2) Proceed to step 3) 5 seconds after completion, and the upsetting amount is 12mm. Other experimental conditions are the same as in Example 1.
[0084] The static bending test is carried out on the joints welded under the above conditions. The experimental method is as follows: cut the rail with welded joints into 1.2m long, center the weld seam, place it on a fulcrum with a span of 1m, and press it with a jack at a rate of 30mm / min. For the welded joint, when the load exceeds 2000kN and the joint does not break, the loading is stopped, and the test result is recorded as "good". When the load breaks below 2000kN, record the load at break. The experimental results are shown in Table 2.
[0085] Table 2 Comparison of pushing allowance at the end of rail foot (60kg / m rail static bending test)
[0086]
[0087] Table 2 compares the results of...
Embodiment 3
[0089] The rails were welded according to the flash welding procedure described in Example 1. A total of 6 sets of experiments were set up, wherein the amount of upset used in each set of experiments was shown in Table 3, and step 3) was performed 5 seconds after step 2) was completed. Other experimental conditions are the same as in Example 1.
[0090] A static bending test (as described in Example 2) was carried out on the joint welded under the above conditions, and the bending deflection of the joint was also recorded while recording the load.
[0091] Table 3 Comparison of upsetting amount (60kg / m rail static bending test)
[0092] serial number Average upsetting amount / mm Average load / kN Average deflection / mm 3-1 16 1544 26 3-2 15 1650 30 3-3 14 1714 38 3-4 13 1823 42 3-5 12 1915 49 3-6 11 1970 56
[0093] It can be seen from the above table that the bending strength of the joint decreases as the amount of up...
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