Welding process for oil pipe of main transformer of electric locomotive

A technology for main transformers and electric locomotives, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as poor seal durability and leakage of transformer oil pipe welds, and achieve good weld seal durability and good promotion function, ensure functional effect

Inactive Publication Date: 2015-12-02
CRRC DALIAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the invention is the poor sealing durability of the main transformer oil pipe weld seam of the electric locomotive, which

Method used

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  • Welding process for oil pipe of main transformer of electric locomotive
  • Welding process for oil pipe of main transformer of electric locomotive

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Embodiment Construction

[0026] now attached figure 1 to attach figure 2 , to further explain the present invention: the present invention mainly uses a new welding process for the welds between pipe fittings, the main transformer cooling oil pipeline is mainly composed of flanges and pipelines, and the pipelines are connected by welding, and the welding includes pipelines Butt joint welding with pipelines, joint welding between pipelines and flanges, the structure and weld position of pipelines refer to figure 1 , figure 2 , the specific content of the process is as follows:

[0027] It is mainly explained from the aspects of welding method selection, setting specifications of welding parameters, weld seam inspection and treatment after welding, hydraulic test, etc. The specific process flow is: pre-weld preparation—position welding—pipe fitting welding—weld seam treatment— hydrostatictest.

[0028] The first step, preparation before welding;

[0029] 1) The carbon steel chemical electrode use...

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Abstract

The invention discloses a welding process for an oil pipe of a main transformer of an electric locomotive. The process includes the steps of firstly, preparation performed before welding, secondly, positioned welding, thirdly, installed welding including pipe butt joint installed welding and installed welding of the pipe and a flange, fourthly, weld joint check and treatment, and fifthly water pressure test. According to the different positions of weld joints, different welding modes and different welding parameters are adopted for different connecting materials and different working environments. The pipe welded according to the specific requirements of the process is free of leakage, no leakage phenomenon exists even after loading operation, the sealing durability of the welding joints is good, the functionality of the main transformer is guaranteed, the operation of the locomotive is guaranteed, and waste of manpower, material resources and financial resources caused by rework is avoided as well. Meanwhile, the process is verified through practice and can be popularized to pipe welding processes of oil pipes of main transformers of electric locomotives of different projects and the popularization effect is good.

Description

technical field [0001] The invention relates to pipeline welding technology, in particular to a welding process for oil pipes of main transformers of electric locomotives. Background technique [0002] Electric locomotives are usually equipped with a main transformer, which can step down the grid voltage and output it. In order to keep the main transformer within the normal operating temperature range, a number of oil circulation pipelines are usually connected outside the shell, and forced-guided oil circulation air is adopted. The cooling method is used for cooling, and the connection of the pipeline adopts the form of flange welding connection. The airtightness of the pipeline directly affects the performance of the main transformer. If the pipeline leaks, it will affect the oil flow and cooling effect Once the oil flow relay or oil temperature sensor detects that the oil flow is lower than the standard value or the oil temperature is higher than the standard value, it wi...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/00B23K9/235B23K9/028B23K101/06
CPCB23K9/167B23K9/00B23K9/0282B23K9/235B23K2101/06
Inventor 赵培培张天朋姜政
Owner CRRC DALIAN CO LTD
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