Heavy-load steel rail welding structure control method

A control method and rail technology, which is applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems that the control effect needs to be investigated, and the cooling rate after welding cannot be realized, so as to improve the uniformity of the structure and enrich the theory The effect of the system

Active Publication Date: 2021-03-23
NORTHEASTERN UNIV
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Problems solved by technology

However, the post-weld heat treatment process of this technology is only for natural cooling of the joints in the air, and the control of the post-weld cooling rate cannot be realized. The control effect on the abnormal martensitic structure at the weld remains to be investigated.
[0010] At present, there are many related technologies for controlling the formation of abnormal martensite structure in the rail base metal or welded joints. However, these related technologies have not formulated an accurate heavy-duty rail welding structure for the transformation temperature of the abnormal structure martensite. Control Method

Method used

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  • Heavy-load steel rail welding structure control method
  • Heavy-load steel rail welding structure control method
  • Heavy-load steel rail welding structure control method

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Experimental program
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Effect test

Embodiment 1

[0043] Research on the formation of abnormal martensitic structure at the weld position of bainite rail welded joints:

[0044] Aiming at the problem of abnormal martensitic structure at the welding seam position of the bainite rail after welding, this example focuses on the influence of the cooling rate on the abnormal martensite structure at the welding seam position of the heavy-duty rail after welding The research is the starting point to determine the optimal post-weld cooling system to suppress the formation of abnormal martensitic structure at the weld position at the welded joint.

[0045] Firstly, using the deformation thermal expansion phase transition instrument DIL805, the CTT curves of different phase transitions of the heavy-duty steel rails used at different cooling rates were obtained, so as to obtain the martensite transformation start temperature and martensite transformation end temperature under the corresponding element composition, and then According to t...

Embodiment 2

[0066] Research on the formation of abnormal martensitic structure at the welded joints of hypereutectoid heavy-duty rails:

[0067] Use the formula K1=399.8-11.5×(7.37x) V1 With K2=259.5-14.1×(6.76x) V2 , where, x=C Mn / 12+Cr / 35+Ni / 21+Mo / 20+Si / 40-V / 3-Al / 21, V1 is the cooling of the martensitic transformation start temperature K1 after welding Rate (K / s), V1 is 3-5K / s, in calculation, V1=4K / s, V2 is the cooling rate (K / s ), V2=0.3K / s; calculated, the martensite transformation start temperature K1 is 611.54K, and the martensite transformation end temperature K2 is 520.86K.

[0068] After welding the eutectoid heavy-duty rail joint, during the cooling process of the welded joint, control the cooling process of the weld position at the welded joint; specifically, the following steps are included:

[0069] Step 1: According to the calculated martensite transformation start temperature K1 and martensite transformation end temperature K2, set the following cooling process to contr...

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Abstract

A heavy-load steel rail welding structure control method belongs to the field of railway steel rail welding. The control method comprises the following steps: firstly, determining a corresponding martensite transformation starting temperature K1 and a martensite transformation ending temperature K2 according to the mass percent of each element in the adopted heavy-load steel rail and a cooling rate to be adopted; after welding is finished, the cooling rate of the weld joint position of the welding joint is firstly controlled to be 3-10 K/s, when the temperature is cooled to K1 + (30-60) K, thetemperature of the weld joint position of the welding joint is controlled, and the cooling rate of the weld joint position of the welding joint is reduced to be '0 jamaa0' 1.0 K/s; and when the temperature is continuously cooled to K2, naturally cooling to the environment temperature. According to the method, based on the heavy-load steel rails with different components, the abnormal martensite structure is effectively inhibited from being generated at the welding seam position of the steel rail welding joint by controlling the cooling rate of the welding seam position at the steel rail welding joint and K1 and K2, and the structure uniformity at the steel rail welding joint can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of railway rail welding, and in particular relates to a method for controlling the welding structure of heavy-duty rails. Background technique [0002] At present, heavy-duty lines such as the Daqin Railway, the Waji Railway, and the Menghua Railway constitute a new national strategic transportation network, which has become the main artery of my country's economic and social development. At the same time, the improvement of heavy-haul railway transportation capacity also puts forward higher requirements for the smoothness, weldability and wear resistance of steel rails, that is, seamless railways with long service life should be built. At this time, new heavy-duty rails such as bainite rails and hypereutectoid rails with excellent comprehensive mechanical properties such as high strength, high toughness, and high wear resistance have gradually become the first choice for heavy-haul railway project construct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00B23K37/02
CPCB23K37/003B23K37/02
Inventor 祭程关锐朱苗勇陈天赐
Owner NORTHEASTERN UNIV
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