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Welding material for rapidly welding and repairing defects of large-scale grey iron casting and repairing method thereof

A welding material and rapid welding technology, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of energy consumption, secondary environmental pollution, high energy consumption, etc., and achieve enhanced crack resistance of welds , Good workability and crack resistance, the effect of rapid welding repair

Inactive Publication Date: 2010-10-06
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of dismemberment and crushing of large scrap parts requires a lot of energy; the reproduction of castings requires smelting again, which consumes energy, and the exhaust gas and slag emitted also cause secondary pollution to the environment
This does not include the waste of labor and time costs

Method used

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  • Welding material for rapidly welding and repairing defects of large-scale grey iron casting and repairing method thereof
  • Welding material for rapidly welding and repairing defects of large-scale grey iron casting and repairing method thereof
  • Welding material for rapidly welding and repairing defects of large-scale grey iron casting and repairing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] First, the welding consumables for welding and repairing of large HT150 gray iron castings are prepared, which are uniformly mixed by weight percentage of powders of the following components: Fe 2 o 3 35%, Al28%; Na 2 CO 3 1.5%, Na 2 B 4 o 7 5%, CaF 2 5%, CaO7%; and G5%, pig iron 7.5%, SiO 2 6%, the total weight is 100%.

[0053] Then, using the above-mentioned prepared welding materials, implement according to the following steps:

[0054] Step 1. Grinding the defective part of the defective casting 1 to process the bevel 8;

[0055] Step 2. Shape around the upper edge of the groove 8. Use molding sand or cement to build the embankment 2 along the upper periphery of the defect groove 8, and leave the introduction groove of the ignition fuze 5 on the upper edge of the embankment 2;

[0056] Step 3, filling the welding material: filling the corresponding welding material 4 into the groove 8 and the embankment 2, embedding the ignition fuze 5, compacting and fil...

Embodiment 2

[0062] First, the welding consumables for the welding and repairing of large HT150 gray iron castings are prepared, which are composed of powders of the following components by weight percentage: Fe 2 o 3 33%, Al30%; Na 2 CO 3 1.4%, Na 2 B 4 o 7 6%, CaF 2 4%, CaO8%; and G4%, pig iron 8.6%, SiO 2 5%, the total weight is 100%.

[0063] Then, adopt the step of embodiment 1, implement welding repair.

Embodiment 3

[0065] First, the welding consumables for the welding and repairing of large HT150 gray iron castings are prepared, which are composed of powders of the following components by weight percentage: Fe 2 o 3 36%, Al27%; Na 2 CO 3 1.6%, Na 2 B 4 o 7 4%, CaF 2 4%, CaO9%; and G4%, pig iron 7.4%, SiO 2 7%, the total weight is 100%.

[0066] Then, adopt the step of embodiment 1, implement welding repair.

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Abstract

The invention discloses a welding material for rapidly welding and repairing defects of a large-scale grey iron casting, comprising the following components in percentage by weight: 33%-38% of Fe2O3, 27%-30% of Al, 1.4%-1.6% of Na2CO3, 4%-6% of Na2B4O7, 4%-6% OF CaF2 and 7%-10% of CaO7, wherein when the material is used for a large-scale HT150 grey iron casting, the material further comprises 4%-5% of G, 7%-10% of pig iron and 5%-8% of SiO2; when the material is used for a large-scale HT200 grey iron casting, the material further comprises 4%-5% of G, 7%-10% of pig iron, 4%-6.5% of 75 Si-Fe, 0.5%-3.2% of Ni and 0.1%-0.5% of Bi, based on the total weight of 100%; and when the material is used for a large-scale HT250 grey iron casting, the material further comprises 3%-4% of G, 6%-10% of pig iron, 4%-6% of 75 Si-Fe, 0.5%-3.2% of Ni, 0.1%-0.5% of Bi, 0.5%-1.8% of Ti, 1.8%-2.4% of 60Si-Ca and 0.5%-3.2% of Al2O3, based on the total weight of 100%. The invention discloses a method for rapidly welding and repairing defects of the large-scale grey iron casting, comprising the following steps: filling the welding material into a space formed by a groove and a dam, leading the welding material to carry out an exothermal reaction, slowly cooling, and removing the metal which is higher than the surface of the casting in a welding area. By using the material and the method of the invention, rapidly welding and repairing the defects of the large-scale grey iron casting can be achieved at room temperature.

Description

technical field [0001] The invention belongs to the technical field of casting salvage engineering, and relates to a welding material for quickly welding and repairing defects of large gray iron castings, and also relates to a method for quickly welding and repairing defects of large gray iron castings. Background technique [0002] The casting process is complicated, and casting defects are inevitable. Rescuing and repairing defective castings is an important measure for enterprises to increase capital and save energy, which is conducive to environmental protection and resource conservation. [0003] Due to the inherent solidification characteristics of cast iron, it is easy to produce white spots and cracks in the welding repair area during the welding process. At present, the methods for high-quality repair of gray iron castings are gas welding and arc hot welding. These two methods are easy to operate and work well for repairing small and medium-sized castings; but for ...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/34B23K23/00
Inventor 翟秋亚徐锦锋任永明
Owner XIAN UNIV OF TECH
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