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Working principle diagram of lift check valve
Lifting check valve structure: Lifting check valve is a kind of valve that prevents pipeline media from flowing back, mainly composed of valve body, valve seat, valve flap, valve cover and other related parts. The lift check valve is equipped with a spring to ensure that the disc is always in a dynamic equilibrium state […]
What is butt welding? (9)- New technology of flash butt welding
New technology of flash butt welding 1) Program-controlled reduced-voltage flash butt welding is characterized by the use of higher secondary no-load voltage at the beginning of the flash to facilitate the initiation of the flash. When the end surface temperature rises, the low-voltage flash is used and maintained The flash speed remains unchanged to improve […]
What is butt welding? (8)- typical workpieces
Butt welding of typical workpieces 1, butt welding of small section workpieces wire with diameter d≤5mm is mostly used for resistance butt welding, Small diameter wires, wires of different materials, and wires and stamping parts (such as resistors and diode end caps) can be welded by capacitive energy storage type, which is characterized by very […]
What is butt welding? (7)- Flash butt welding of common metals
The following describes the characteristics of flash butt welding of several commonly used metal materials: 1. Flash butt welding of carbon steel This kind of material has the advantages of high resistivity, the oxidation of carbon element during heating provides a protective atmosphere for the interface CO and CO2, and does not contain elements that […]
What is butt welding? (6)- Flash butt welding of common metals
Flash butt welding of common metals Almost all steel and non-ferrous metals can be flash butt welded, but to obtain high-quality joints, it is necessary to take necessary process measures according to the relevant characteristics of the metal. The analysis is as follows: (1) Electrical and thermal conductivity For metals with good electrical and thermal […]
What is butt welding? (5)- flash butt welding
(4) Flash speed vf A sufficiently large flash speed can ensure the strong and stable flash. However, if vf is too large, the heating zone will be too narrow, which will increase the difficulty of plastic deformation. At the same time, due to the increase in welding current required, it will increase the depth of […]
What is butt welding? (4)- flash butt welding
2. Resistance and heating of flash butt welding The contact resistance Rc during flash butt welding is the total resistance of the liquid metal lintel between the end faces of the two workpieces, and its size depends on the number of lintels and their cross-sectional area at the same time. The latter two are related […]
What is butt welding? (3)- flash butt welding
Flash butt welding Flash butt welding can be divided into continuous flash butt welding and preheated flash butt welding. Continuous flash butt welding consists of two main stages: the flash stage and the upsetting stage. Preheating flash butt welding only adds a preheating stage before the flashing stage. One, two stages of flash butt welding […]
What is butt welding? (2)
2. Welding cycle, process parameters and workpiece preparation for resistance butt welding 1, welding cycle During resistance butt welding, the two workpieces are always pressed tightly. When the end face temperature rises to the welding temperature Tω, the distance between the end faces of the two workpieces is as small as a few angstroms. The […]
What is butt welding? (1)
Butt resistance welding (hereinafter referred to as butt welding) is a type of resistance welding method that uses resistance heat to weld two workpieces along the entire end surface at the same time. Butt welding has high productivity and easy automation, so it is widely used. Application of butt welding: Butt welding has high productivity […]