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HFSi welding pin and preparation method thereof

A welding pin, stirring and mixing technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of inability to solve the technical difficulties of PFA tube sheet welding

Active Publication Date: 2014-12-10
ZHUZHOU HONGDA POLYMER MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned prior art has a simple manufacturing method, it cannot solve the above-mentioned PFA tube sheet welding technical difficulties

Method used

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  • HFSi welding pin and preparation method thereof

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Embodiment Construction

[0016] The HFSi welding pin is formed by pressing and sintering after mixing three raw materials, and the three raw materials and their weight percentages are: 70% fluororesin powder, 20% polyphenylene ester and 10% ceramic powder.

[0017] The present invention will be described in further detail below.

[0018] 1. Key technology of HFSi welding pin

[0019] HFSi welding pins are used in the production process of PFA heat exchangers. When the end plate of the heat exchanger is put into the welding fixture, the two ends of the tubes pass through the orifice plate respectively, and the protruding part and the end plate are repaired and inserted into the hole. Welding pins, using the expansion of the welding pins at high temperature and the resultant force of swelling caused by the thermal expansion of the end plate, extrude the molten orifice plate and the tube wall to achieve the purpose of welding. After cooling and shaping, pull out the welding pin, the aperture of each...

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Abstract

The invention discloses an HFSi welding pin and a preparation method thereof. The HFSi welding pin is formed by mixing three row materials, then pressing the materials and sintering the pressed materials. The HFSi welding pin comprises the three materials in percentage by weight: 70 percent of fluorine resin powder, 20 percent of polyphenylene ester and 10 percent of ceramic powder. The preparation method of the HFSi welding pin comprises the following steps: compounding and stirring for mixing; metering and pressing; sintering and cooling; surface coarsening processing; and silicon resin impregnating and curing. The HFSi welding pin can not be melted at the high temperature of 400 DEG C, can not deform, is corrosion-resistant, has good strength, a good thermal expansion property and excellent anti-sticking performance; when the welding pin and a tube plate are welded in a melting manner, no physical and chemical reaction can be generated; after the tube plate is welded, welding joints of inner holes in tube nests are flat and smooth, the technical requirements for PFA (Perfluoroalkoxy alkane) heat exchanger tube plate welding and the like are met, the technical difficulty in the PFA tube plate welding is solved, manufacturing cost is lowered, and a wide prospect for PFA heat exchanger tube plate welding processing is opened up.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a welding pin and a preparation method thereof. Background technique [0002] With the rapid development of the chemical industry, smelting and surface treatment industries, how to deal with energy conservation and environmental protection, how to break through the anti-corrosion problem, and realize the green industry are the focus of many enterprises. As early as the 1970s abroad, the industrially developed United States developed high-temperature-resistant and corrosion-resistant PFA raw materials, which were commercialized in the 1980s. In the late 1990s, Japan developed heat exchangers made of PFA materials in the chemical and smelting industries, which greatly reduced environmental pollution. And energy consumption, is a trustworthy good anti-corrosion product. In the late 2000s, my country's Wuhan Iron and Steel, Taiyuan Iron and Steel and other large state-owned enterpri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C67/04B23K37/00
Inventor 朱基贵
Owner ZHUZHOU HONGDA POLYMER MATERIALS
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