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Welding material for quickly welding and repairing defects of HT300 grey iron castings and repair method

A welding material and rapid welding technology, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of gray iron casting defects that are difficult to deal with, achieve the enhancement of weld crack resistance, reduce white spots and Crack tendency, effect of rapid welding repair

Inactive Publication Date: 2012-07-04
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a welding material for quickly welding and repairing the defects of large-scale HT300 gray iron castings, which solves the problem that the defects of gray iron castings are difficult to deal with under the existing technical conditions

Method used

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  • Welding material for quickly welding and repairing defects of HT300 grey iron castings and repair method
  • Welding material for quickly welding and repairing defects of HT300 grey iron castings and repair method
  • Welding material for quickly welding and repairing defects of HT300 grey iron castings and repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] First, the welding consumables for the welding of large HT300 gray iron castings are prepared, which are composed of powders of the following components mixed uniformly by weight percentage:

[0049] Fe 2 o 3 34%, Al 27%; Na 2 CO 3 1.0%, Na 2 B 4 o 7 4.0%, CaF 2 4.0%, CaO 8.0%, SiO 2 1.5%; graphite 3.0%, pig iron 7.0%, 75 ferrosilicon 4.0%, nickel 0.5%, bismuth 0.2%, 60 silicon calcium 1.0%, 30 ferrotitanium 1.0%, 75 ferromanganese 1.4%, 50 ferrochrome 1.0%, 50 0.5% ferromolybdenum, 0.5% tin bronze, 0.2% ferro-18 boron, 0.2% ferro-60 vanadium, the total weight is 100%.

[0050] Carry out welding according to aforementioned repairing method again, in the above-mentioned embodiment, the chemical composition (Wt%) of the welding powder deposited metal after repairing is respectively:

[0051] C is 2.70, Si is 1.70, Mn is 0.96, Mo is 0.03, Cr is 0.05, Cu is 0.06, Ti is 0.02, V is 0.01, S is 0.08, and P is 0.15.

[0052] The mechanical properties of the weld m...

Embodiment 2

[0054] First, the welding consumables for the welding of large HT300 gray iron castings are prepared, which are composed of powders of the following components mixed uniformly by weight percentage:

[0055] Fe 2 o 3 32%, Al 28%; Na 2 CO 3 1.5%, Na 2 B 4 o 7 5.0%, CaF 2 6.0%, CaO7.0%%, SiO 2 1.0%; graphite 3.5%, pig iron 6.0%, 75 ferrosilicon 3.5%, nickel 0.6%, bismuth 0.1%, 60 silicon calcium 1.5%, 30 ferrotitanium 0.5%, 75 ferromanganese 1.3%, 50 ferrochrome 1.2%, 50 0.6% ferromolybdenum, 0.5% tin bronze, 0.1% ferro-18 boron, 0.1% ferro-60 vanadium, the total weight is 100%.

[0056] Carry out welding according to aforementioned repairing method again, in the above-mentioned embodiment, the chemical composition (Wt%) of the welding powder deposited metal after repairing is respectively:

[0057] C is 2.63, Si is 1.66, Mn is 0.91, Mo is 0.03, Cr is 0.06, Cu is 0.05, Ti is 0.01, V is 0.01, S is 0.07, and P is 0.17.

[0058] The mechanical properties of the weld m...

Embodiment 3

[0060] First, the welding consumables for the welding of large HT300 gray iron castings are prepared, which are composed of powders of the following components mixed uniformly by weight percentage:

[0061] Fe 2 o 3 35%, Al 26%; Na 2 CO 3 1.0%, Na 2 B 4 o 7 4.0%, CaF 2 4.0%, CaO 8.0%, SiO 2 0.5%; graphite 3.5%, pig iron 8.0%, 75 ferrosilicon 3.5%, nickel 0.5%, bismuth 0.2%, 60 silicon calcium 1.0%, 30 ferrotitanium 1.0%, 75 ferromanganese 1.4%, 50 ferrochrome 1.0%, 50 0.5% ferromolybdenum, 0.5% tin bronze, 0.2% ferro-18 boron, 0.2% ferro-60 vanadium, the total weight is 100%.

[0062] Carry out welding according to aforementioned repairing method again, in the above-mentioned embodiment, the chemical composition (Wt%) of the welding powder deposited metal after repairing is respectively:

[0063] C is 2.89, Si is 1.84, Mn is 0.90, Mo is 0.03, Cr is 0.03, Cu is 0.05, Ti is 0.01, V is 0.01, S is 0.07, and P is 0.16.

[0064] The mechanical properties of the weld m...

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Abstract

The invention discloses a welding material for quickly welding and repairing defects of HT300 grey iron castings, comprising powder components including, by mass percentage, from 30 to 35% of Fe2O3, from 25 to 30% of Al, from 1.0 to 1.6% of Na2CO3, from 4.0 to 6.0% of Na2B407, from 4.0 to 6.0% of CaF2, from 7.0 to 10.0% of CaO, from 0.5 to 1.5% of SiO2, from 3.0 to 4.0% of graphite, from 6.0 to 8.0% of pig iron, from 3.5 to 5.0% of 75 ferrosilicon, from 0.5 to 1.2% of nickel, from 0.1 to 0.5% of bismuth, from 1.0 to 2.0% of 60 calcium silicon, from 0.5 to 1.8% of 30 ferrotitanium, from 1.2 to 2.0% of 75 ferromanganese, from 1.0 to 1.5% of 50 ferrochromium, from 0.5 to 1.0% of 50 ferromolybdenum, from 0.5 to 0.6% of tin bronze, from 0.1 to 0.5% of 18 ferro-boron and from 0.1 to 0.5% of 60 ferrovanadium which are uniformly mixed. The total weight percent of the components is 100%. The invention further discloses a method for quickly welding and repairing defects of large-sized HT300 grey iron castings by the aid of the welding material. By the aid of the material and the method, the defects of the large-sized HT300 grey iron castings can be quickly welded and repaired 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-scale HT300 gray iron castings, and also relates to a method for rapidly welding and repairing defects of large-scale HT300 gray iron castings by using the welding material. 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 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/34B23K23/00
Inventor 翟秋亚徐锦锋
Owner XIAN UNIV OF TECH
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