阅读说明：本技术 一种防止焊缝裂纹的焊接用陶瓷衬垫及其制备方法 (Welding ceramic liner capable of preventing weld cracks and preparation method thereof ) 是由 乔吉春 许慧敏 *** 信国松 于 2019-11-06 设计创作，主要内容包括：本发明公开了一种防止焊缝裂纹的焊接用陶瓷衬垫及其制备方法,包括以下原料及重量份数：氟化钙10-16份、金红石15-30份、钾长石40-60份、萤石8-15份、氧化铝15-25份。本发明焊接用陶瓷衬垫改善熔化金属的流动性,从而使熔敷金属具有良好的防止裂纹的能力,Si在熔敷金属过渡也减少,所以大大降低了焊缝裂纹产生的几率。(The invention discloses a welding ceramic liner capable of preventing weld cracks and a preparation method thereof, wherein the welding ceramic liner comprises the following raw materials in parts by weight: 10-16 parts of calcium fluoride, 15-30 parts of rutile, 40-60 parts of potassium feldspar, 8-15 parts of fluorite and 15-25 parts of alumina. The ceramic liner for welding improves the fluidity of the molten metal, so that the deposited metal has good crack prevention capability, and the transition of Si in the deposited metal is reduced, so that the probability of generating cracks of welding seams is greatly reduced.)

1. The ceramic liner for welding for preventing the cracks of the welding seams is characterized by comprising the following raw materials in parts by weight: 10-16 parts of calcium fluoride, 15-30 parts of rutile, 40-60 parts of potassium feldspar, 8-15 parts of fluorite and 15-25 parts of alumina.

2. A ceramic backing for welding as set forth in claim 1, further comprising sodium water glass.

3. The ceramic backing for welding according to claim 2, wherein said sodium-type water glass is used in an amount of 20% of the total amount of the four raw materials of calcium fluoride, rutile, potash feldspar, fluorite and alumina.

4. The ceramic backing for welding according to claim 2, wherein said sodium water glass is selected from Na₂SiO₃·9H₂O。

5. The ceramic gasket for welding according to claim 2, wherein the ceramic gasket for welding is SiO₂The content is 25-35%.

6. A method of preparing a ceramic pad for welding according to any one of claims 2 to 5, comprising the steps of:

(1) mixing calcium fluoride, rutile, potash feldspar, fluorite and alumina in certain weight proportion;

(2) adding sodium type water glass into the step (1), uniformly stirring, placing into a mold, and compacting;

(3) and (5) drying the mold at a high temperature, discharging, and carrying out vacuum packaging.

7. The method as claimed in claim 6, wherein the drying temperature in step (3) is 1100-1250 ℃ and the drying time is not less than 12 h.

Technical Field

The invention relates to the technical field of welding materials, in particular to a welding ceramic liner capable of preventing weld cracks and a preparation method thereof.

Background

With the rapid development of the marine industry, the construction of the ultra-large container ship not only brings huge opportunities and challenges to the expansion of the international market, environmental protection, port construction and other aspects, but also brings challenges to shipbuilding materials. Therefore, the container transport ship body generally adopts high-strength and high-toughness and large-thickness steel plates. The steel plate with high strength, toughness and large thickness meets the performance requirement, and simultaneously, the stress state of the steel plate is converted from a plane stress state to a plane strain state, so that the anti-cracking performance of the material is reduced. The brittle fracture of the material leads to a plurality of accidents of a large container ship. When the component has potential defects or cracks, the welding seam with good crack arrest performance can stop the crack from expanding in a small range under the action of dynamic load and impact load, and major accidents are prevented.

In the face of the existing foreign patent technology barriers, China iron and steel enterprises develop a series of technical challenges for the crack arrest steel plate for the ultra-large container ship, and the steel plate with high strength and toughness, low yield ratio, high crack arrest performance and easy weldability is obtained through multiphase structure ratio regulation. The China crack arrest steel is successfully applied to the construction of domestic ultra-large container ships, the demand for the marine crack arrest steel is further increased in the future, and the performance requirements are continuously improved. Although domestic iron and steel enterprises have successfully developed the products, the novel crack-stopping steel material has extremely strict requirements on welding environment and process, and high process difficulty, so that the welding material (including ceramic liner for welding) matched with the novel crack-stopping steel material also mainly depends on imported products, and the performance level of the welding material produced in China is also different from the international top level. Therefore, new materials for welding need to be developed to meet the crack prevention performance of welding deposited metal and match with crack-stopping steel for large-sized container ships.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, an object of the present invention is to provide a ceramic liner for welding that prevents weld cracks and a method for manufacturing the same. The ceramic liner for welding can prevent the flux-cored welding wire from generating cracks during welding, particularly arc closing, thereby improving the quality and the efficiency of welding seams.

In order to achieve the above objects or other objects, the present invention is achieved by the following technical solutions:

a ceramic liner for welding for preventing weld cracks comprises the following raw materials in parts by weight: 10-16 parts of calcium fluoride, 15-30 parts of rutile, 40-60 parts of potassium feldspar, 8-15 parts of fluorite and 15-25 parts of alumina.

Further, sodium type water glass is also included.

Furthermore, the dosage of the sodium type water glass is 20 percent of the total amount of the five raw materials of calcium fluoride, rutile, potash feldspar, fluorite and alumina.

Further, the sodium type water glass is selected from Na₂SiO₃·9H₂O。

Further, the ceramic liner SiO for welding₂The content is 25-35%.

A method for preparing the ceramic gasket for welding comprises the following steps:

(1) mixing calcium fluoride, rutile, potash feldspar, fluorite and alumina in certain weight proportion;

(2) adding sodium type water glass into the step (1), uniformly stirring, placing into a mold, and compacting;

(3) and (5) drying the mold at a high temperature, discharging, and carrying out vacuum packaging.

Further, the drying temperature in the step (3) is 1100-.

The ceramic liner provided by the invention has the advantages that the adopted raw materials are slightly alkaline, the ceramic liner has strong deoxidation and desulfurization effects, the silicon content is reduced in the selection of the materials, the S, P content in deposited metal is reduced when the ceramic liner is used for flux-cored wire welding, and the fluidity of molten metal is improved, so that the deposited metal has good crack prevention capability, and the transition of Si in the deposited metal is also reduced, so that the probability of weld cracks is greatly reduced. Therefore, the welding of the main body structure of the large ship body can be met, and the problem that cracks are easy to generate and cannot be solved by common welding materials is solved.

In the formula of the ceramic liner at the present stage, quartz sand is generally used as a main raw material, and the formula comprises the following components: quartz sand, reduced titanium, fluorite and alumina. Calcium fluoride and rutile are added into the ceramic liner for welding to improve the alkalinity of the ceramic liner, so that the alkalinity of the ceramic liner for welding is over 1.6; with SiO-containing layers₂Less potassium feldspar to replace quartzLess silicon content in ceramic liner, and SiO in ceramic liner for welding₂The content is about 30 percent, and the ceramic liner SiO used at present₂The content is about 60 percent; as the silicon content of the ceramic liner increases, the transition of deposited metal silicon elements also increases, so that the probability of causing weld cracks also greatly increases. The ceramic liner can prevent cracks from being generated when the cored wire receives arc welding, thereby improving the welding seam quality and the welding efficiency.

Detailed Description

The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.