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Experimental study on transverse fretting wear of flange bolts

In order to study the loosening mechanism of flange connection bolts in transverse vibration, the transverse fretting wear test of fasteners was carried out by means of transverse vibration fatigue testing machine, and then the decline process of preload and preload torque of bolt connection under different transverse loads and frequencies was observed, and the wear amount and surface damage were measured. The results show that the decrease of bolt preload can be divided into two stages; At the beginning of the experiment, the decrease of preload is in the plastic deformation stage and the decrease of preload is in […]

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Nine problems in stainless steel welding

What is stainless steel and stainless acid resistant steel? Answer: the content of “chromium” is the main element added in metal materials (other elements such as nickel, molybdenum, etc. also need to be added) It can make the steel in passivation state and has stainless property. Acid resistant steel refers to the corrosion resistant steel in acid, alkali, salt and other strong corrosive media. What is austenitic stainless steel? What are the commonly used brands? A: austenitic stainless steel is the most widely used and has the most varieties. For example: Series 18-8: 0Cr19Ni9 (304) 0cr18ni8 (308) Series 18-12: 00cr18ni12mo2ti […]

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How to distinguish flat welding, vertical welding, horizontal welding and over……

The film evaluators are familiar with the welding method (manual welding or automatic welding), welding type (single-sided welding or double-sided welding), welding position (flat welding, vertical welding, horizontal welding, overhead welding) and its image characteristics, which is very helpful for the correct judgment of defects, and this is also the content of the actual operation film evaluation examination, so this section makes a brief introduction. Identification of welding method (manual welding or automatic welding) The welding method (manual welding or automatic welding) is easy to identify. In most cases, automatic welding has no welding wave image. If the welding wave […]

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How to deal with scratches on stainless steel mirror surface

It is generally known that the stainless steel scratches on the mirror surface appear in the following situations: The first is that before processing, the plate is scratched; It’s just not obvious; This requires judgment of the severity of the scratch. If the scratch area and scratch depth have exceeded the customer’s acceptance of the final product effect, then the plate meeting the requirements should be replaced, that is, the control of processing operators is very important. The second is that the plate has been finished mirror processing, but in the process of coating is not careful to be scratched. […]

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Electrochemical corrosion behavior of 2205 and 316L stainless steel flanges in……

The electrochemical behaviors of 2205 duplex stainless steel flange and 316L stainless steel flange in 5% (volume fraction) HF solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The semiconductor properties of the passive films on the surfaces of the two stainless steels were analyzed by Mott schokkty curves. The results show that both kinds of stainless steel can be passivated in hydrofluoric acid solution, and 2205 duplex stainless steel has wider passivation range and lower dimensional passivation current density. The results show that the surface passive film of 2205 duplex stainless steel has higher passive film resistance and […]

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Common connection modes of valves

Whether the connection mode between valve and pipeline or equipment is right or not will directly affect the probability of pipeline valve running, emitting, dripping and leaking. Common valve connection methods include: flange connection, clamp connection, butt welding connection, threaded connection, sleeve connection, clamp connection, self sealing connection, etc. Flange connection Flange connection is the valve body with flange at both ends, corresponding to the flange on the pipeline, and the flange is fixed by bolts and installed in the pipeline. Flange connection is the most commonly used connection form in valves. Flange has convex surface (RF), plane (FF), convex […]

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What is a pressure regulating valve?

What is a pressure regulating valve? Pressure regulating valve, also known as self balancing valve, flow control valve, flow controller, dynamic balancing valve and flow balancing valve, is an intuitive and simple flow regulating control device. The application of flow regulating valve in pipe network can directly set the flow according to the design. Under the action of water, the valve can automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline, regardless of the system The function of the valve makes the flow regulation of the pipe network complete at one time, […]

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The principle of flange bolt hole positioning

ASME B16.5 has clear regulations on the number of bolt holes and bolt hole diameter of the flange. The number and diameter of flange bolt holes are different due to different flange pressure levels, but all types of flanges of the same pressure level are the same. The flange bolt holes are evenly distributed on the bolt hole diameter, and the number of holes is always an even number (4, 8, 12, 16, etc.). In the manufacture of prefabricated parts with flanges, the positioning of flange bolt holes is particularly important. Perhaps you will see the following sentence in a […]

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What is a valve electric device?

What is a valve electric device? Valve electric device is a device that uses electricity to drive opening and closing or regulating valves. The valve electric device is an indispensable driving device to realize valve program control, automatic control and remote control. Its movement process can be controlled by stroke, torque or axial thrust. The working characteristics and utilization of the valve electric device depend on the type of valve, the working specifications of the device and the position of the valve on the pipeline or equipment. Electric devices generally consist of the following parts: Special motor, characterized by strong […]

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Ten lessons that must be paid attention to in the process of mold heat treatment

When manufacturing mold parts, a heat treatment process is usually adopted in order to achieve the required hardness and strength. The metal heat treatment process is to change the surface or internal structure of the material and obtain the required performance by means of heating, heat preservation and cooling in the solid state of the metal material. However, in actual operation, it is often caused by failures rather than technical key problems caused by some small details that are not worth mentioning, and it is not a mistake in the specific application of the typical theories mentioned in the book. […]

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