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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 […]
Classification and characteristics of welding
Metal welding can be divided into three categories: fusion welding, pressure welding and brazing according to the characteristics of the process. The characteristics are: 1. Fusion welding: heat the workpiece to be joined to partially melt it to form a molten pool. The molten pool will be joined after cooling and solidification. If necessary, a […]
Valve model establishment and meaning
The latest valve model compilation method Nowadays, there are more and more types of valves and materials, and the compilation of valve models is becoming more and more complicated. The standardization of valve models provides convenience for valve design and selection. Although my country has a unified standard for valve model compilation, it is gradually […]
Types of valve accessories
Types of valve accessories: The valve itself is composed of a valve body and various operating mechanisms, which also contain many parts and accessories, including manual, pneumatic, electric and so on. The components assembled in different ways of use are also different. Valve accessories mainly include: 1. Pneumatic actuator: It is mainly divided into single-acting […]