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Technology of welding and repair for defects of E grade steel coupler and coupler yoke

A coupler frame and welding repair technology, which is applied in the field of welding and repairing defects of E-grade steel couplers and coupler frames, can solve problems such as cracks and inability to guarantee welding quality, and achieve simple process, good welding quality and no cracks The effect of defects

Inactive Publication Date: 2009-06-03
CRRC DALIAN CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

For this reason, the test adopted a local preheating temperature of about 300 ℃, and immediately covered the heat preservation method with plant ash after welding repair. Using this process, after 12 hours, it was found that the welding repair point still had crack defects, and the welding repair quality could not be guaranteed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Taking the welding repair of 17 E-grade steel hook bodies, 20 E-grade steel knuckles, and 10 E-grade steel tail frames as an example, the above-mentioned parts are heated in an electric furnace as a whole before welding and repairing. ℃, and keep the above temperature for 0.5-1.5 hours, then hang out the electric furnace for welding repair treatment, the welding rods used, the specifications of the welding rods and the treatment of the welding rods can be the same as the existing technology. Slowly cool the furnace to ≤150°C and then take it out of the furnace.

[0012] Using this process, 17 E-grade steel hook bodies, 20 E-grade steel knuckles, and 10 E-grade steel tail frames are welded and repaired, and the welding repair points are photographed and recorded, so as to accurately define the heat treatment after welding. point of impact. At the same time, the welded repair point was ground, and the wet magnetic particle inspection was carried out. After the flaw detec...

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PUM

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Abstract

The invention discloses a technology of welding and repair for a workpiece, particularly to a technology of welding and repair for defects of an E grade steel coupler and a coupler yoke. The technology is characterized in that the technology comprises the steps as follows: a, before welding and repair, the coupler and the coupler yoke are integrally heated under a temperature of 250 to 300 DEG C, and the heat is preserved for 0.5 to 1.5 hours; b, welding and repair treatment is conducted; after welding and repair, the coupler and the coupler yoke are melted down, and the heat is preserved; under the temperature, furnace cooling is conducted; and the temperature of the coupler and the coupler yoke is reduced to be lower than and equal to 150 DEG C; and c, tapping is conducted. Compared with the prior art, the technology has the advantages of simple process, easy operation, no crack defect, and good welding and repair quality.

Description

technical field [0001] The invention relates to a welding and repairing process for workpieces, in particular to a welding and repairing process for E-grade steel coupler and coupler frame defects. Background technique [0002] According to the "E-grade steel material manufacturing technology", E8515 welding rod is used for welding and repairing of E-grade steel material. The diameter of the welding rod is Φ4mm, and the ambient temperature of the welding repair site is ≥4℃. Before welding and repairing, the electrode is baked in an oven at 300°C, and kept for 1-1.5 hours, then cooled down to 100-150°C and stored at a constant temperature. Welding and repairing of casting defects should be completed in one cleaning. Before welding, the casting defects should be cleaned up, and the metal body should be exposed. Then use an oxygen-acetylene flame to bake and preheat the defective part to ≥200°C, immediately apply welding, and cool naturally after welding. A DC welding machin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
Inventor 张可刚宋永宽李玉汉
Owner CRRC DALIAN CO LTD
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