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A method of double-layer composite powder submerged arc surfacing welding high chromium alloy

A double-layer composite, high-chromium alloy technology, used in arc welding equipment, welding equipment, welding media, etc., can solve the problem of unbalanced composition and structure of high-chromium alloy layer, easy cracking of powder deposited alloy, impact on the service life of parts, etc. problems, to achieve the effects of simple surfacing production organization, small dilution effect, and high utilization efficiency

Active Publication Date: 2020-09-29
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only that, the investment of laser and plasma arc equipment is high, the maintenance and repair are complicated, and small and medium-sized enterprises cannot bear the high cost of use; and laser and plasma welding are easy to crack due to the large heat input
In addition, some enterprises use powder blocks to surfacing high-chromium alloys. Although the supply form is simple, the components are very special due to the poor arc ignition of powder blocks, and the requirements for surfacing welding operations are high, so there are not many applications.
[0005] In addition, the surfacing of high-chromium alloys is significantly affected by the dilution of low-carbon steel or low-alloy steel matrix components, and a hypoeutectic structure is formed at the interface with the matrix, and the composition and structure of the high-chromium alloy layer are not balanced.
After the surface hard layer is worn, the subsequent layer wears too fast, which seriously affects the service life of the parts

Method used

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  • A method of double-layer composite powder submerged arc surfacing welding high chromium alloy
  • A method of double-layer composite powder submerged arc surfacing welding high chromium alloy
  • A method of double-layer composite powder submerged arc surfacing welding high chromium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] All powder components were passed through a 60-mesh sieve before weighing. According to the composition ratio requirements of the mixed powder, the powder components such as high-carbon ferrochrome, vanadium ferro, titanium ferro, flake graphite and reduced iron powder are weighed. The composition (percentage by weight) of the mixed powder is: high-carbon ferrochrome (FeCr70C8.0) 80%, ferro-vanadium (FeV50-A) 10%, ferro-titanium (FeTi30A) 2%, flake graphite (C) 7%, reduced iron Powder (Fe) 1%. Put the weighed powders into the same container, stir well to make them evenly mixed, and form mixed powder.

[0054] Then, in the above-mentioned mixed powder, with the addition amount of 5ml each time, dope into the sodium silicate water glass of Baume degree 35, modulus 3.0, until every 100g of this mixed powder water glass finally add the silica of 20ml volumetric amount. Sodium acid water glass. During this period, keep stirring, and make the mixed powder rotate to granula...

Embodiment 2

[0067] All powder components were passed through a 60-mesh sieve before weighing. According to the composition ratio requirements of the mixed powder, the powder components such as high-carbon ferrochrome, vanadium ferro, titanium ferro, flake graphite and reduced iron powder are weighed. The composition (percentage by weight) of the mixed powder is: high-carbon ferrochrome (FeCr70C8.0) 75%, ferro-vanadium (FeV50-A) 12%, ferro-titanium (FeTi30A) 4%, flake graphite (C) 8%, reduced iron Powder (Fe) 1%. Put the weighed powders into the same container, stir well to make them evenly mixed, and form mixed powder.

[0068] Then, in the above-mentioned mixed powder, dope sodium silicate type water glass with Baume degree 40 and modulus 3.3 with the addition amount of 5 ml each time, until every 100 g of the mixed powder water glass finally adds 15 ml volume of silicon Sodium acid water glass. During this period, keep stirring, and make the mixed powder rotate to granulate, let stan...

Embodiment 3

[0074]All powder components were passed through a 60-mesh sieve before weighing. The powder components such as high-carbon ferrochrome, vanadium ferro, titanium ferro, flake graphite and reduced iron powder are weighed according to the composition ratio requirements of the above mixed powder. The mixed powder composition (percentage by weight) is: 78% of high-carbon ferrochrome (FeCr70C8.0), 9% of ferro-vanadium (FeV50-A), 4% of ferro-titanium (FeTi30A), 7% of flake graphite (C), reduced iron Powder (Fe) 2%. Put the weighed powders into the same container, stir well to make them evenly mixed, and form mixed powder.

[0075] Then, in the above-mentioned mixed powder, dope sodium silicate type water glass with a Baume degree of 30 and a modulus of 3.2 with an addition amount of 5 ml each time, until every 100 g of the mixed powder water glass finally adds 25 ml of silicon in a volumetric amount. Sodium acid water glass. During this period, keep stirring, and make the mixed po...

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Abstract

The invention discloses dual-layer compound powder and a high-chromium alloy submerged arc welding method. The method mainly includes the steps of conducting adhering, granulating, surfactant attaching, sintering and sieving on mixed powder of various types of powder to form specific-granularity compound powder, conducting submerged arc welding with an H08A solid wire as an electric arc carrier tobe used as a submerged welding material, inducing electric arc to preferentially melt the compound powder according to the advantage that the compound powder with a surfactant easily transmits electrons, and melting a compound powder melt and molten drops into an integrated molten bath, and cooling and condensing the molten bath to form high-chromium alloy of a texture structure with primary M7C3as the main wear-resistant phase. The method is simple in preparing process and high in deposition efficiency, and the prepared high-chromium alloy has high wear resistance, completely meets the practical requirements, and can be used for submerged arc welding of wear-resistant layers of parts under the abrasive particle abrasion working conditions.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant surfacing welding, and in particular relates to a method for submerged arc surfacing welding of high-chromium alloys with double-layer composite powder particles having a surfactant. Background technique [0002] High chromium alloy because of its high microhardness (Fe, Cr) 7 C 3 (1300~1800HV) and (Fe,Cr) 23 C 6 (1140HV) and other carbides show relatively good wear resistance and corrosion resistance, and are most widely used as wear-resistant materials for parts, such as cement rollers, liners and concrete delivery pipes. [0003] The preparation methods of high chromium alloys are mainly casting and surfacing. Casting uses electric furnaces to smelt high-carbon ferrochrome and other raw materials, and then injects molten iron into sand molds to prepare high-chromium parts. However, the molding process requires high requirements and consumes a lot of raw materials and energy. Surfaci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K35/02B23K35/30C22C27/06C22C30/00
CPCB23K9/18B23K35/0244B23K35/3053C22C27/06C22C30/00
Inventor 龚建勋姚惠文程诗尧陈愚马蓦
Owner XIANGTAN UNIV
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