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Double-coated electrode and preparation method thereof

A coated electrode and coating technology, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems that the welding speed of two welding cores cannot be guaranteed to be consistent, affecting the normal use of electrodes, and the breakdown of electrodes between double cores. Achieve the effects of reducing wear loss, improving high temperature wear resistance, and reducing production costs

Active Publication Date: 2020-10-02
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the coating contains a large amount of conductive particles such as graphite, it is easy to cause electrode breakdown between the two cores due to conduction, which affects the normal use of the electrode.
[0005] Shandong University discloses a double-core electrode in the patent "Double-core electrode and light arc welding process" (public number: CN1161204C), which is to bond two single-core electrodes into a double-core electrode. Core soldering rate cannot be guaranteed to be consistent

Method used

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  • Double-coated electrode and preparation method thereof
  • Double-coated electrode and preparation method thereof
  • Double-coated electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] Example 1: A TiC-VC-NbC electrode with double-coated and double-deposited electrodes

[0044] Such as figure 1 As shown, it includes inner coating 1, outer coating 2, two layers of coating and two welding cores 3. The inner coating 1 is located between the two welding cores 3, and its graphite content is at the critical graphite content 4 for electrode breakdown. % or less, the outer coating 2 wraps two parallel welding cores 3, the graphite content in the outer coating ranges from 10-15%, the distance between the two welding cores ranges from 0.8-2.0mm, and the two layers of coating are bonded agent bonding. The binder is potassium water glass: sodium water glass 4:1 mixed aqueous solution.

[0045] As a specific example, the list of inner coating, outer coating, electrode composition and mass fraction is as shown in Table 1:

[0046] Table 1 Double-coated electrodes with different components and mass fractions

[0047]

[0048]

[0049] In this embodiment, t...

Embodiment 2

[0050] Embodiment 2: a kind of preparation method of double-coated electrode, comprises the steps:

[0051] Step (1), making the welding core according to the required electrode specifications; preparing the inner coating and the outer coating respectively, and bonding the coating powder with binder and water;

[0052] Step (2), using a welding rod coating press to coat the inner drug skin coating between two welding cores arranged in parallel;

[0053] Step (3), using an electrode coating press to apply the outer coating to the outer peripheries of the two welding cores with inner coatings obtained in step (2), and then dry them to obtain the double coating welding rod.

[0054] The drying step is a conventional process in the field of electrode preparation. As a typical example, the specific drying steps are: first place the double-coated electrode at room temperature for 24 hours, and then put it in a drying furnace and heat it at 50°C for 1 hour. Hours, 120 ° C for 0.5 h...

Embodiment 3

[0055] Embodiment 3: Prepare the coating press used in step (2) and step (3) in the preparation method of the double-coated electrode, such as figure 2 As shown, it includes a moving mechanism 21, a welding core fixing mechanism 22, a coating mechanism 23, an in-position detection mechanism 24 and a drug delivery mechanism 25. The coating mechanism 23 is arranged at one end of the moving mechanism, and the welding core to be coated passes through the welding The core fixing mechanism 22 is connected to the moving mechanism 21 and moves to the coating mechanism driven by the moving mechanism 21. The in-position detection mechanism 24 detects the position of the welding core on the moving mechanism 21. When the welding core penetrates the coating mechanism 23 and finally crosses the When the coating mechanism 23 is applied, the in-position detection mechanism 24 controls the moving mechanism 21 to return; the drug delivery mechanism 25 is connected to the coating mechanism 23 an...

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Abstract

The invention discloses a double-coated electrode and a preparation method thereof. The double-coated electrode comprises an inner coating, an outer coating and two core wires; the inner coating is located between the two core wires, and the graphite content of the inner coating is 4% below the critical graphite content at which the electrode can be broken through; the outer coating wraps the twocore wires parallel to each other, and the content of graphite in the outer coating is 10-15%; and the interval between the two core wires is 0.8-2.0 mm, and the two coatings are bonded through an adhesive. The invention provides the electrode containing the inner and outer coating structures, by arranging the two coatings different in graphite content, the situation that electrode breaking through may occurs because that the two core wires are electro-conductive is avoided, and normal use of the electrode is ensured. The electrode provided by the invention is high in overlaying efficiency, safe and capable of saving energy, the overlaying hardness is high, and the abrasion weight loss is greatly decreased.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a double-coated electrode and a preparation method thereof. Background technique [0002] Wear is one of the main forms of failure of metal materials. There are many methods to improve the wear resistance of metals, including chemical heat treatment, coating, surfacing, spraying, laser surface treatment, vapor deposition, etc. Among them, surfacing welding technology is widely used due to its high efficiency and low cost. Many fusion welding methods can be used for surfacing welding. Among them, the arc welding process of electrodes is simple and flexible, and it is widely used in parts repair, roll welding repair, and wear-resistant parts surfacing strengthening. [0003] The composition of the wear-resistant electrode coating contains a certain amount of graphite and alloying elements such as Ti, V, and Nb. During the welding process, the two undergo metallurgical reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/16B23K35/362B23K35/40B05D7/14B05D7/24B05D5/08B05C9/06
CPCB23K35/0272B23K35/0277B23K35/0283B23K35/362B23K35/40B05D7/14B05D7/542B05D7/24B05D5/08B05C9/06B05D2202/10
Inventor 赵伟饶伟锋肖光春张辉白雪
Owner QILU UNIV OF TECH
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