阅读说明：本技术 堆焊焊条及其制备方法 (Surfacing welding electrode and preparation method thereof ) 是由 吴郁均 吴定博 于 2019-11-20 设计创作，主要内容包括：本发明公开了一种堆焊焊条及其制备方法,堆焊焊条含有的组分及各组分质量百分比如下：大理石2-8％；萤石3-8％；硅酸盐2-6％；石墨5-9％；金属铬10-20％；高碳铬铁60-80％,总计100％。使用它焊接可以有较好的耐腐蚀性,大大降低焊条成本,不容易产生焊条与母材之间的剥离,有较好的高温耐磨性。(The invention discloses a surfacing electrode and a preparation method thereof, wherein the surfacing electrode comprises the following components in percentage by mass: 2-8% of marble; 3-8% of fluorite; 2-6% of silicate; 5-9% of graphite; 10-20% of metal chromium; 60-80% of high-carbon ferrochrome, and 100% of the total. The welding rod has better corrosion resistance, greatly reduces the cost of the welding rod, is not easy to strip the welding rod and the parent metal, and has better high-temperature wear resistance.)

1. The surfacing welding electrode is characterized by comprising the following components in percentage by mass:

2-8% of marble;

3-8% of fluorite;

2-6% of silicate;

5-9% of graphite;

10-20% of metal chromium;

60-80% of high-carbon ferrochrome, and 100% of the total.

2. The hardfacing electrode of claim 1,

the high-carbon ferrochrome comprises the following chemical components in percentage by weight: cr: 65-69%; c: 6 to 10 percent; si is less than or equal to 3 percent; s is less than or equal to 0.03 percent; p is less than or equal to 0.03 percent and the total is 100 percent.

3. The hardfacing electrode of claim 1,

the graphite is colloidal graphite, and the chemical components and the content percentage of the graphite are that C is more than or equal to 99.5 percent, S is less than or equal to 0.02 percent, and P is less than or equal to 0.02 percent.

4. The hardfacing electrode of claim 1,

the fluorite comprises the following chemical components in percentage by weight: CaF ₂≥98％，Si≤1.5％，S≤0.03％，P≤0.03％。

5. The hardfacing electrode of claim 1,

in marble, CaCO ₃≥98.5wt％。

6. A method of producing the surfacing electrode according to any one of claims 1 to 5, characterized by comprising the steps of:

sieving the powder of each component respectively;

mixing the sieved components according to the corresponding mass percentage to obtain a mixture;

adding the mixture into a stirrer, adding water glass, stirring, and making into a pile by using an oil press for producing welding rods.

Technical Field

The invention relates to a surfacing welding electrode and a preparation method thereof.

Background

At present, the existing D707 surfacing electrode with high hardness and abrasive wear resistance is widely used in an Fe-W-C alloy system, and the wear-resistant hard phase structure in the surfacing structure is mainly a tungsten carbide structure. However, such a surfacing electrode is extremely expensive, and when the surfacing is thick, peeling between the weld and the base metal is easily generated, and although the structure hardness of the surfacing layer is high (HRC can reach more than 60), the surfacing layer of such an alloy system is often not ideal under certain working conditions, especially under the condition that some corrosive abrasive particles are worn.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a surfacing welding electrode which has better corrosion resistance, greatly reduces the cost of the welding electrode, is not easy to strip from a base metal and has better high-temperature wear resistance.

The technical scheme for solving the technical problem of the invention is as follows: a surfacing welding electrode comprises the following components in percentage by mass:

2-8% of marble;

3-8% of fluorite;

2-6% of silicate;

5-9% of graphite;

10-20% of metal chromium;

60-80% of high-carbon ferrochrome, and 100% of the total.

Further, the high-carbon ferrochrome comprises the following chemical components in percentage by weight: cr: 65-69%; c: 6 to 10 percent; si is less than or equal to 3 percent; s is less than or equal to 0.03 percent; p is less than or equal to 0.03 percent and the total is 100 percent.

Furthermore, the graphite is colloidal graphite, and the chemical components and the content percentage of the graphite are that C is more than or equal to 99.5 percent, S is less than or equal to 0.02 percent, and P is less than or equal to 0.02 percent.

Further, the fluorite comprises the following chemical components in percentage by weight: CaF ₂≥98％，Si≤1.5％，S≤0.03％，P≤0.03％。

Further, in marble, CaCO ₃≥98.5wt％。

The invention also provides a preparation method of the surfacing welding electrode, which comprises the following steps:

sieving the powder of each component respectively;

mixing the sieved components according to the corresponding mass percentage to obtain a mixture;

adding the mixture into a stirrer, adding water glass, stirring, and making into surfacing welding rod with an oil press for producing welding rod.

By adopting the technical scheme, the added alloy elements refine the structure of the overlaying layer, and the structure is equivalent to increase of hard phase layers after the structure is refined, so that the influence of harmful effects caused by abrasion is reduced to a certain extent, and the wear resistance is improved; the method for improving the wear resistance of the surfacing welding layer is different from the method for adding alloy elements to refine the structure, and the method obtains a very uniform weld joint structure by adjusting the formula of the powder in the surfacing welding electrode without adding other alloy elements, and the wear resistance of the weld joint structure is improved by depending on the uniformity of a hard phase of the weld joint structure, so that compared with the weld joint structure of an Fe-W-C alloy system, the weld joint structure of the Fe-Cr-C alloy system has two obvious advantages: 1. the weld joint is beautiful, 2, the cost of raw materials is saved. The HRC hardness value of the weld metal of the surfacing electrode is about 67, and in order to obtain a weld with a uniform structure, (I) the problem of pores in the weld is solved, and the D707 electrode generally has little pores in an arc pit, because the abrasion resistance of a welding workpiece is not influenced, but the existence of a small amount of pores in the surfacing electrode of the invention can influence the uniformity of the structure. The pores are divided into two types, one is hydrogen pores, the other is carbon monoxide pores, and the pores welded by the high-chromium cast iron are carbon monoxide pores generally. The welding process is a chemical metallurgical welding process, in the process, redox reaction runs through all the time, and CO pores are easily generated when the activity of FeO is too high.

Detailed Description

The invention provides a surfacing electrode and a preparation method thereof, and a person skilled in the art can realize the surfacing electrode by properly improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.

A surfacing welding electrode comprises the following components in percentage by mass:

3-8% of marble;

3-8% of fluorite;

2-6% of silicate;

5-9% of graphite;

10-20% of metal chromium;

60-80% of high-carbon ferrochrome, and 100% of the total.

In the core wire powder, three materials of high-carbon ferrochrome, graphite and metal chromium are substance bases for providing hard phases for weld joint tissues.

The high-carbon ferrochrome comprises the following chemical components in percentage by weight: cr: 65-69%; c: 6 to 10 percent; si is less than or equal to 3 percent; s is less than or equal to 0.03 percent; p is less than or equal to 0.03 percent.

Furthermore, the graphite is colloidal graphite, and the chemical components and the content percentage of the graphite are that C is more than or equal to 99.5 percent, S is less than or equal to 0.02 percent, and P is less than or equal to 0.02 percent.

In order to obtain a weld joint structure with the hardness of HRC67, the marble and fluorite are also required, and the fluorite comprises the following chemical components in percentage by weight: CaF ₂More than or equal to 98 percent, less than or equal to 1.5 percent of Si, less than or equal to 0.03 percent of S and less than or equal to 0.03 percent of P; in marble, CaCO ₃≥98.5wt％。

The invention also provides a preparation method of the surfacing welding electrode, which comprises the following steps:

sieving the powder of each component respectively;

mixing the sieved components according to corresponding mass percentage, mixing the mixed medicinal powder by using a powder mixer to obtain a mixture, and adding water glass for wet mixing until the mixture is well mixed;

adding the mixed wet powder into an oil press for manufacturing welding rods to prepare the surfacing welding rods.

The alloy elements are added to refine the structure of the overlaying layer, and after the structure is refined, the hard phase layers are increased, so that the influence of the harmful effect caused by the abrasion is reduced to a certain extent, and the wear resistance is improved.

The method for improving the wear resistance of the surfacing welding layer is different from the method for adding alloy elements to refine the structure, and the method obtains a very uniform welding seam structure by adjusting the formula of the powder in the surfacing welding electrode without adding other alloy elements, and the wear resistance of the welding seam structure is improved by depending on the uniformity of a hard phase of the welding seam structure.

Compared with the welding seam structure of the Fe-W-C alloy system, the welding seam structure of the Fe-Cr-C alloy system has two obvious advantages: 1. the weld joint is beautiful, 2, the cost of raw materials is saved.

The HRC hardness value of the weld metal of the surfacing electrode is about 67.

In order to obtain a uniformly-woven weld, the problem of pores in the weld is solved, and the small amount of small pores in the arc craters is generally not significant in D707 because the small pores do not affect the wear resistance of the welded workpiece, but the small amount of small pores in the surfacing electrode of the invention affects the uniformity of the structure. The pores are divided into two types, one is hydrogen pores, the other is carbon monoxide pores, and the pores welded by the high-chromium cast iron are carbon monoxide pores generally. The welding process is a chemical metallurgical welding process, in the process, redox reaction runs through all the time, and CO pores are easily generated when the activity of FeO is too high.

In order that the present invention may be more clearly understood, the following detailed description of the present invention is given with reference to specific examples.