Fluxless heat-and wear-resistant cast iron alloy surfacing welding electrodes and manufacture thereof

A technology of wear-resistant cast iron and surfacing welding rods, which is applied in the direction of manufacturing tools, welding media, welding equipment, etc., can solve the problems that the quality cannot be guaranteed, the time for cleaning welding slag is long, and it is not easy to clean up, so as to achieve low cost and use High cost, effect of reducing cracks

Inactive Publication Date: 2004-09-22
攀钢集团钢城企业总公司溶解乙炔厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alloy electrode with coating has welding slag on the surface after welding. It takes a long time to clean the welding slag after welding, and it is not easy to clean up.
In order to ensure the wear resistance of spare parts, the carbon equivalent of the surfacing metal is high. To reduce the cracks of the weld, it is necessary to maintain a high interlayer temperature. When the weld is still at a high temperature after welding, the welding slag must be cleaned. , the adhesion of welding slag is strong, it is difficult to clean it up, and it is easy to form slag inclusion defects
For spare parts with a thicker surfacing layer, the quality of the surfacing cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Medium frequency induction furnace is used to smelt molten iron, and its composition (wt%) is: C: 4.8%, Si: 1.6%, Mn: 1.0%, Cr: 23%, S: 0.046%, P: 0.038%, O≤0.01%, N≤0.01%, Al≤0.02%, and the rest is Fe. A casting cavity of φ14mm×350mm is made with ordinary molding sand, and the cavity is sprayed with graphite paint, dried and poured. The molten iron temperature is 1500±20°C, and the pouring temperature is 1430±20°C. After the molten iron is cooled to room temperature in the cavity, the welding rod is made, and the sand and paint on the surface of the welding rod are cleaned before use.

[0016] The average hardness value of the surfacing metal surface of the electrode is HRC=56.

Embodiment 2

[0018] Using medium frequency induction furnace to smelt molten iron, its composition (wt%) is: C: 2.5%, Si: 0.4%, Mn: 0.4%, Cr: 16%, S: 0.046%, P: 0.038%, O≤0.01%, N≤0.01%, Al≤0.02%, and the rest is Fe. A casting cavity of φ14mm×350mm is made with ordinary molding sand, and the cavity is sprayed with graphite paint, dried and poured. The molten iron temperature is 1500±20°C, and the pouring temperature is 1430±20°C. After the molten iron is cooled to room temperature in the cavity, the welding rod is made, and the sand and paint on the surface of the welding rod are cleaned before use.

[0019] The average hardness value of the surfacing metal surface of the electrode is HRC=42.

Embodiment 3

[0021] Medium frequency induction furnace is used to smelt molten iron, and its composition (wt%) is: C: 6.5%, Si: 2.5%, Mn: 1.5%, Cr: 35%, Nb: 1.5%, Mo: 3.5%, Ni: 2.0%, W: 2.5%, V: 1.5%, Ti: 0.8%, Cu: 0.2%, S: 0.046%, P: 0.038%, O≤0.01%, N≤0.01%, Al≤0.02%, and the rest is Fe. A casting cavity of φ14mm×350mm is made with ordinary molding sand, and the cavity is sprayed with graphite paint, dried and poured. The molten iron temperature is 1500±20°C, and the pouring temperature is 1430±20°C. After the molten iron is cooled to room temperature in the cavity, the welding rod is made, and the sand and paint on the surface of the welding rod are cleaned before use.

[0022] The average hardness value of the surfacing metal surface of the electrode is HRC≥60.0.

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Abstract

An uncoated refractory antiwear welding cast iron alloy electrode for build-up welding contains C (2.5-6.5 wt.%), Si (0.8-2.5), Mn (0.4-1.5), Cr (16-35), Nb (0-1.5), Mo (0-3.5), Ni (0-2.0), W (0-2.5), V (0.1-2.0), Ti (0-0.8), Cu (0-1.0), S (0-0.08), P (0-0.1), O (0-0.08), N (0-0.08), Al (0-0.1) and Fe (rest), and is made up by casing method. Its advantages are high hardness of welded layer (more than 42 HRC), and low cost.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to an electrode used for surfacing a layer of heat-resistant and wear-resistant cast iron alloy on the surface of equipment parts and a manufacturing method thereof. Background technique [0002] Many mechanical equipment parts used in mining, metallurgy, chemical industry, machinery and other industries need to be heat-resistant and wear-resistant. Traditionally, they are mainly processed by integral casting, composite casting and integral forging. Integral forged spare parts and cast steel spare parts have high mechanical strength, but low hardness and are not wear-resistant; integral cast iron spare parts have high hardness, but low mechanical strength and poor impact resistance; However, due to the poor fusion of the joint parts of iron and steel, the cast iron part with higher hardness is easy to fall off during use; Spare parts for good fusion of wear-resistant and heat-resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K35/22
Inventor 马仕兴刘兴俊唐银生王新
Owner 攀钢集团钢城企业总公司溶解乙炔厂
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