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Discussion on the usage of high strength fastener

Fastener is the most common type of standard parts in mechanical products due to its variety, specification, large usage and wide application. The reasonable selection of fasteners has also become an important link in the process of product design. Whether the fasteners are used correctly or not is directly related to the functional realization and safe operation of the product. Compared with general fasteners, high-strength fasteners have different requirements in product design, manufacturing, assembly, inspection and maintenance, and play a more critical role in the operation of equipment. With the development of mechanical products to large-scale, automatic, intelligent and other […]

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Special welding process and NDT requirements for duplex stainless steel

1. Overview Duplex stainless steel is a kind of stainless steel with dual phase microstructure of ferrite and austenite. The proportion of ferrite and austenite in solution structure is about 50%, and the content of less phase is more than 30%. The metallographic structure determines that the performance of the Ferritic Austenitic duplex stainless steel is between ferritic stainless steel and austenitic stainless steel. It has the advantages of both stainless steels. It not only has good plasticity, toughness, corrosion resistance and weldability, but also has stronger intergranular corrosion resistance than other kinds of stainless steel. Therefore, it has many […]

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What are the eight defects in welding engineering?

The quality defects existing in welding engineering mainly include the following aspects: the defects that can be seen by naked eye or low power magnifying glass and located on the weld surface, such as undercut (undercut), weld beading, arc crater, surface porosity, slag inclusion, surface crack, unreasonable weld position, etc., are called external defects, and the internal gas that can only be found by destructive test or special non-destructive testing method Hole, slag inclusion, internal crack, incomplete penetration and incomplete fusion are called internal defects. But most of them are welding slag and spatter and welding scar after welding. Contents: […]

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What are the factors affecting the performance and service life of stainless s……

In the future, China’s stainless steel pipe fittings markets will have a rapid development, how to deal with the development? This paper analyzes the factors affecting the performance and service life of stainless steel pipe fittings through stainless steel materials, forming process, wall thickness change and solution (heat treatment) process, so that enterprises can learn better and produce high-quality pipe fittings; users can learn more about and select products with good quality and performance, and accelerate the application of stainless steel pipe fittings in many fields. Contents: 1. Factors affecting the performance and service life of stainless steel pipe fittings […]

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Welding properties of metal materials

Concept of weldability of metallic materials The weldability of metal materials refers to the ability of metal materials to obtain excellent welding joints under certain welding conditions, including welding methods, welding materials, welding specifications and welding structure forms. If a metal can obtain excellent welding joint by more common and simple welding processes, the weldability of the metal material with good welding performance can be generally divided into two aspects: process weldability and use weldability.Process weldability: refers to the ability to obtain excellent and defect free welded joints under certain welding process conditions. It is not the inherent property of […]

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What does hardness of a material mean?

Hardness refers to the ability of materials to resist local deformation, especially plastic deformation, indentation or scratch. It is a measure of the hardness and softness of materials. Contents: Brinell Hardness Rockwell Hardness Vickers Hardness Leeb Hardness According to the different test methods, the hardness is divided into three types:① Scratch hardness. It is mainly used to compare the hardness and softness of different minerals. The method is to select a rod with one end hard and one end soft, and then cross the tested material along the rod, and determine the hardness and softness of the tested material according […]

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Types of Gaskets

Gaskets are used to create a static seal between two flanges faces, at various operating conditions, with varied pressure and temperature ratings. A gaskets fills the microscopic spaces and irregularities of the flange faces, and then it forms a seal that is designed to keep liquids and gases. Correct installation of damage-free gaskets and demage-free flange faces is a requirement for a leak-free flange connection. If it would be technically possible, in order to manufacture flanges perfectly flat and smooth, and perfectly compatible with one another under all operating conditions, a gasket would not be necessary. But in normal practice […]

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Do you know how foreign customers choose Chinese pipe fittings suppliers?

I. What are Foreign Buyers Thinking When selecting a New Pipe Fittings Supplier? Supplier Type (Factory, Trading Company, Sourcing Agent, Freight Forwarder & QC) Credibility & Reputation,Age, Specialism Honesty and Integrity Easonable Price High Quality Good Communication Ease of Doing Business Quality Certifications (ISO, CE etc.) Familiarity withthe Export Market and Economic Situation II. Where do Foreign Buyers look for pipe fittings Suppliers? How is each Platform used? Alibaba.com Aliexpress 1688.com Global Sources Made-in-china DH Gate Hktdc International Tradeshows Trade Showdirectory Sites Google Search Forums Social Mediarecommendations III. Steps to Improving Communication with Foreign Buyers. Get used to scheduling initial & follow-up […]

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Study on Manufacturing Technology for Inconel 718 Twelve-Point Bolt

High temperature alloy is an important structural material in aerospace and nuclear industry. Because of its excellent high temperature mechanical properties, it is widely used to make various parts of aeroengine [1]. With the development of aeroengine technology, superalloy has developed rapidly. Inconel 718 is a kind of deformed nickel iron base superalloy, which has high strength, toughness, fatigue resistance and good comprehensive properties, especially under 650 ℃, its mechanical properties have good stability [2-3]. Inconel 718 Alloy is the most widely used high temperature alloy in aeroengine, which is mainly used in rotating parts, gearbox, fastener and other parts […]

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Why PTFE gasket cannot be used to seal FRP, plastic and other low load flange?

Distributors and manufacturers of gaskets are often asked why PTFE gaskets cannot be used to seal fiberglass reinforced plastics (FRP or FRP), plastics and other low load flanges. Usually, the answer is that there is too little load on the gasket. The answer is simple, but the solution is complex. Unfortunately, in most cases, the gasket is generally considered to be the cause of the failure. Traditional gasket applications Current requirements for gasket Requirements for gasket load Recommendations and Solutions Traditional gasket applications After all, the application of FRP and plastic pipe in chemical treatment industry is due to its low cost […]

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