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Special-purpose welding rod for built-up welding of hot work die restoration

A technology for hot working molds and welding rods, which is applied to welding equipment, manufacturing tools, welding media, etc., can solve problems such as gaps, and achieve the effects of high activity, improved toughness and crack resistance of welding rods, and severe metallurgical reactions

Active Publication Date: 2015-11-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Surfacing welding electrodes with excellent high-temperature oxidation resistance, good wear resistance, high cleanliness, and good fatigue resistance are urgently needed welding materials for mold manufacturing and repair and remanufacturing. At present, the performance of such electrodes in my country is comparable to that in foreign countries large gap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Ferroalloy passivation Put 45# ferrosilicon, metallic manganese, metallic chromium and high-carbon ferrochromium in a heat-resistant steel pan with a thickness of 30mm, and stir 3 times during baking. The roasting process parameters are: 45# ferrosilicon is 700℃, heat preservation for 1 hour, and then cools with the furnace; metal manganese is 280℃, heat preservation for 1 hour, and then cools with the furnace; metal chromium and high carbon ferrochrome are 550℃, heat preservation for 1 hour , Cooling with the furnace. Other ferroalloys do not need to be processed and used in the state of supply.

[0056] (2) Dry mixed powder is weighed according to the ratio of the electrode coating formula. First, the marble, fluorite, titanium dioxide, quartz, mica, and soda ash with a smaller specific gravity are weighed according to the formula ratio and then mixed. The powder machine is dry-mixed for 10 minutes to obtain non-alloy mixed powder; then the passivated electrolytic m...

Embodiment 2

[0064] (1) Ferroalloy passivation Put 45# ferrosilicon, metallic manganese, metallic chromium and high-carbon ferrochromium in a heat-resistant steel pan with a thickness of 40mm, and stir 5 times during baking. The roasting process parameters are: 45# ferrosilicon is 800°C, holding for 1 hour, and then cooling with the furnace; metallic manganese is 320°C, holding for 1 hour, and cooling with the furnace; metallic chromium and high-carbon ferrochrome are 580°C, holding for 1 hour , Cooling with the furnace. Other ferroalloys do not need to be processed and used in the state of supply.

[0065] (2) Dry mixed powder weighs the powder according to the formula of the electrode coating. First, weigh the marble, fluorite, titanium dioxide, quartz, mica, soda ash, and graphite with the smaller specific gravity according to the formula ratio, and then mix. The powder mixer is dry-mixed for 15 minutes to obtain non-alloy mixed powder; then the passivated electrolytic manganese, 45# ferr...

Embodiment 3

[0073] (1) Ferroalloy passivation Put 45# ferrosilicon, metallic manganese, metallic chromium and high-carbon ferrochromium in a heat-resistant steel pan with a thickness of 35mm, and stir 4 times during baking. The roasting process parameters are: 45# ferrosilicon is 750°C, holding for 1 hour, and then cooling with the furnace; metallic manganese is 300°C, holding for 1 hour, and cooling with the furnace; metallic chromium and high-carbon ferrochrome are 560°C, holding 1 Hours, cool down with the furnace. Other ferroalloys do not need to be processed and used in the state of supply.

[0074] (2) Dry mixed powder weighs the powder according to the formula of the electrode coating. First, weigh the marble, fluorite, titanium dioxide, quartz, mica, soda ash, and graphite with the smaller specific gravity according to the formula ratio, and then mix. The powder mixer is dry-mixed for 12 minutes to obtain non-alloy mixed powder; then the passivated electrolytic manganese, 45# ferros...

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Abstract

The invention provides a special-purpose welding rod for built-up welding of hot work die restoration. The special-purpose welding rod comprises a coating and a welding core. Nanometer chromium-nitride powder is added into alloy powder and a fine nitride interstitial phase is formed in deposited metal, so that the deposited metal has excellent toughness and crack-resistant performances. Meanwhile, yttrium oxide is added into the alloy powder, so that the deposited metal can be purified, occluded foreign substances can be spheroidized, formation of the nitride strengthening phase can be promoted, and the anti-fatigue performance of the deposited metal is improved. When the welding rod is used for restoring the hot work die, the obtained deposited metal has the excellent high-temperature anti-oxidation performance, wear-resistant performance, cleanliness and anti-fatigue performance.

Description

Technical field [0001] The invention belongs to the field of welding materials, and particularly relates to a special welding rod used for hot work die repair and surfacing welding. Background technique [0002] In recent years, with the rapid development of my country's metallurgical industry and manufacturing industry, the use of molds, especially hot work molds, such as hot-rolled work rolls, hot forging dies, hot extrusion dies, and hot blanking dies, has been increasing. Has become one of the consumable parts used in a large number of industrial production. The mold will fail due to abrasion, thermal fatigue and other reasons during use. How to improve its service life has always been a hot research topic at home and abroad. The life of the mold mainly depends on the mold material, structural design, heat treatment process, processing and other aspects. The service life of molds in my country is only 1 / 2-1 / 3 that of foreign countries, and there are problems of low precisio...

Claims

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Application Information

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IPC IPC(8): B23K35/362
CPCB23K35/3601B23K35/362
Inventor 孙俊生
Owner SHANDONG UNIV
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