Method for patching, overlay welding and reproducing large-scale hollow steel casting

A technology for steel castings and remanufacturing, applied in manufacturing tools, welding equipment, arc welding equipment, etc., can solve problems such as large deformation, poor weld quality, and low strength, and achieve the effect of ensuring consistency

Inactive Publication Date: 2013-05-08
CHONGQING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned technical defects. In order to provide a method for remanufacturing of large-scale hollow steel castings, the remanufacturing and repairing of large-scale hollow steel castings is carried out by using the method of partial excavation and replacement, and starting from the welding process structure and welding parameters. Problems of poor weld quality, low strength and large deformation in actual production ensure that large steel castings can work long-term, accurately and stably during service; on the premise of ensuring that the quality of repaired products is equivalent to that of normal products, reduce production cost, to obtain good economic benefits

Method used

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  • Method for patching, overlay welding and reproducing large-scale hollow steel casting
  • Method for patching, overlay welding and reproducing large-scale hollow steel casting
  • Method for patching, overlay welding and reproducing large-scale hollow steel casting

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Embodiment 1

[0065] The following is a case analysis of railway wagon bolster and side frame steel castings as examples.

[0066] Because bolsters and side frames are important stress-bearing components in the running part of railway freight cars, their quality directly affects the development of railway transportation and the safety of life and property. Bolsters and side frames are cast from B+ grade (ZG25MnCrNi). During the welding repair of castings, due to the structural characteristics of the bolster and side frame and the high content of alloying elements, the hardening tendency is large, and cold and hot cracks are prone to occur. At the same time, the joint structure after welding is not uniform, especially in the overheated zone of the heat-affected zone. Coarse crystal grains can easily cause fracture. In view of these problems, from the welding method, the selection of welding materials, whether to open the bevel and the opening method of the bevel, the selection of voltage an...

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Abstract

The invention discloses a method for patching, overlay welding and reproducing a large-scale hollow steel casting. The method for patching, overlay welding and reproducing the large-scale hollow steel casting includes the steps: 1) preparing a groove, 2) carrying out welding, 3) carrying out postwelding treatment, and 4) inspecting quality. According to the method for patching, overlay welding and reproducing the large-scale hollow steel casting, a parent-child component partial replacing method is adopted to reproduce, overlay weld and repair, from the welding process structure and welding parameters, the problems that the welding is bad in quality, low in intensity and large in deformation in actual production are resolved, so that the large-scale hollow steel casting is guaranteed to work accurately and stably for a long time in the process of service. Under the condition that quality of repaired products is equal to the quality of normal produces, production cost is lowered, and good economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a method for remanufacturing large-scale steel castings by dredging and mending surfacing welding, in particular to a technology for remanufacturing large-scale steel castings by partial replacement and surfacing welding. Background technique [0002] Large cast steel parts are the key parts of the machine, used for the manufacture and molding of large steam turbine impellers, large marine crankshafts, cold and hot rolls of large rolling mills, various high-pressure vessels and other extra-large complex and hollow parts. Its technical conditions are strict and its performance requirements are high. The production process of large steel castings is complicated, the production conditions are harsh, and the production difficulty is high. Involving various factors such as molding sand, molding, furnace (alloy composition, purity), pouring, and sand cleaning methods, the quality cont...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235B23K9/013
Inventor 程里林江张小彬
Owner CHONGQING UNIV OF TECH
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