What is shrinkage porosity? Shrinkage porosity refers to that the final solidification area of the casting is not fed by liquid metal or alloy to form dispersed and small shrinkage cavity. Often scattered in casting The axis area of wall thickness, the thick part, the root of ri ...

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On November 5, 2020, at the invitation of Shanghai Institute of rules and regulations of China Classification Society (CCS), I had the honor to participate in the review meeting of the review draft of “additive manufacturing inspection guide”. During the meeting, we had face-to-fac ...

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What is a heat exchanger? Heat exchanger is a kind of energy-saving equipment which can realize heat transfer between two or more fluids at different temperatures. It can transfer heat from the fluid with higher temperature to the fluid with lower temperature, so that the fluid temperature can ...

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What is cemented carbide? Cemented carbide is a kind of alloy made by powder metallurgy with one or several kinds of refractory carbides (tungsten carbide, titanium carbide, etc.) as the main component and metal powder (cobalt, nickel, etc.) as adhesive. It is mainly used to manufacture high-s ...

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Stainless steel surface finish type Abbreviation Processing type Surface state NO.1 Hot rolling, heat treatment, pickling or descaling Rough and dull 2E surface Cold rolling, heat treatment and descaling wi ...

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Industrial rubber Natural rubber is suitable for water, sea water, air, inert gas, alkali, salt aqueous solution and other media, but it is not resistant to mineral oil and non-polar solvents. Its long-term service temperature is not more than 90 ℃, and its low-temperature performance is e ...

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The threaded fastener has the advantages of compact structure, convenient disassembly, large connection force and repeated use. It has great advantages in the use of the equipment, which ensures the reliability and stability of the mechanical system. Threaded fasteners have become one of the standa ...

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By comparing the composition and structure of the qualified and unqualified samples of the notch durability of GH907 forgings, the behavior of the persistent fracture of GH907 forgings was studied. The results show that the permanent fracture mode of GH907 forgings is mainly intergranular crackin ...

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The first step in metal processing is cutting. The raw materials are simply cut off or separated according to the shape to get the blank. Common metal cutting methods are: grinding wheel cutting, saw cutting, flame cutting, plasma cutting, laser cutting and water jet cutting. Grinding wheel cutti ...

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What is a tube bushing? As an important part of aero-engine, tube bushing is used for the installation of gears and bearings in the shell. The materials of pipe sleeves are carbon steel and titanium alloy. In order to reduce the weight of the engine, titanium alloy bushing is the majority. The ...

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Objective to analyze the causes of serious internal corrosion thinning of the corner elbow used in a shale gas transportation platform, clarify the corrosion type and mechanism, guide the anti-corrosion treatment, and improve the service safety of the corner elbow. Methods taking the corner elbow ...

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Carbon steel is the main material used in the secondary pipeline of nuclear power plant. In recent years, more and more attention has been paid to the problem of carbon steel pipe thinning due to the safety accidents caused by the secondary pipeline rupture in nuclear power plants. In this pape ...

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