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What is the principle of flash butt welding machine?
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What is the principle of flash butt welding machine?
Release time:2022.06.01
Summary of information:
Flash butt welding machine, also known as flash butt welding machine, is a type of resistance welding machine. The principle is that two metal workpiece ports are in contact, conduct electricity through the contact points of the ports, and then use the resistance heat of the workpiece itself to heat the workpiece and flash continuously to weld.
Flash butt welding machine is also calledFlash butt welding machine, is a type of resistance welding machine. The principle is that two metal workpiece ports are in contact, conduct electricity through the contact points of the ports, and then use the resistance heat of the workpiece itself to heat the workpiece. When the temperature reaches the melting point, the metal melts to form a liquid metal layer. The liquid metal is extruded by applying a transverse upsetting force, so that the two workpieces are closely combined to produce common grains, thereby obtaining a hot forging structure to form a butt joint. As shown in the picture
Formation of flash
After the two metal workpieces that are in contact with each other are energized, some bumps between the ports first come into contact. When the current passes through these contact points, the conductive area suddenly decreases, causing the current lines to move downward and shrink, thereby increasing the resistance. The resistance generates more heat, and the ports are rapidly heated and melted to form liquid metal lintels. These metal lintels conduct heat into the interior of the workpiece. Each lintel has liquid surface tension, radial compression effect force, electromagnetic attraction and electromagnetic repulsion. The radial compression force is proportional to the square of the current intensity flowing through the lintel. Under the action of these forces, the diameter of the lintel decreases, the current density increases sharply, and the temperature rises rapidly, causing metal vapor to appear inside the lintel. The metal vapor causes the volume of the liquid lintel to expand rapidly and explode, and the molten metal particles splash out from the gap between the openings, forming flying sparks. The location after blasting left a crater with a certain depth, creating conditions for the formation of lintels nearby. The flashing process is a process in which liquid metal lintels are continuously produced at the welding end face and then exploded continuously.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technology products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, row welding machine, mesh welding machine,Resistance automatic welding machine, energy storage welding machine, copper rod and aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal spot welding machine, home appliance hardware spot welding machine, small electrical appliance spot welding machine, copper row copper pipe welding machine, nut spot welding machine, stainless steel welding machine, foil strip spot welding machine, aluminum spot welding machine, multi-head spot welding machine, bag There are more than 300 types of cage spot welding machines, mesh welding machines, ton rack welding production lines, resistance automatic welding machines, brazing machines, diffusion welding machines, projection welding machines, seam welding machines, wire and cable optical cable supporting equipment, etc. If you are interested in our welding equipment, please contact us.
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Flash butt welding of low carbon steel and medium carbon steel
Summary of information:
Low carbon steel has high resistivity. When melted at high temperature, carbon elements produce protective atmospheres of CO and CO2 and do not produce high melting point oxides. Therefore, the weldability is good. Medium carbon steel has a higher carbon content than low carbon steel, and its resistivity is also higher. The crystallization interval, high temperature strength and hardening tendency all increase accordingly. We need to increase the upsetting force and upsetting retention
Low carbon steel has high resistivity. When melted at high temperature, carbon elements produce protective atmospheres of CO and CO2 and do not produce high melting point oxides. Therefore, the weldability is good.
Medium carbon steel has a higher carbon content than low carbon steel, and its resistivity is also higher. The crystallization interval, high temperature strength and hardening tendency all increase accordingly. We need to increase the upsetting force and upsetting allowance. To reduce the effects of quenching. Generally, preheated flash butt welding is used for welding, and post-weld heat treatment is performed.
When flash butt welding of low carbon steel and medium carbon steel, carbon diffuses to the heated end face and undergoes a chemical reaction. During upsetting, the liquid metal with high carbon content in the semi-melted zone is squeezed out, so a bright band is formed at the joint, that is, a carbon-depleted layer weld with low carbon content. Generally, we use heat treatment to eliminate the carbon-depleted layer.
In addition to low carbon steel and medium carbon steel, the flash butt welding machine can also butt high carbon steel, such as cast iron steel rings. We generally use preheated flash butt welding for cast iron steel rings. Due to the high carbon content, a large amount of C0 and C02 protective atmosphere is generated during flash welding. The self-protection effect is strong and it is easy to squeeze out the liquid metal with high carbon content to obtain high-quality joints.
Wuxi Xinxing Welding Equipment Factory has been engaged in resistance welding for 29 years. Its core technical products include: semi-automatic butt welding machine, pneumatic-flash butt welding machine, multi-strand wire welding machine, foot pedal spot welding machine, pneumatic spot welding machine, medium frequency spot welding machine, row welding machine mesh welding machine, resistance automatic welding machine, energy storage welding machine, copper rod and aluminum rod disc circular welding machine, auto parts spot welding machine, sheet metal spot welding machine, home appliance hardware spot welding machine, small electrical appliances There are more than 300 types of spot welding machines, copper bar copper tube welding machines, nut spot welding machines, stainless steel welding machines, foil strip spot welding machines, aluminum spot welding machines, multi-head spot welding machines, bag cage spot welding machines, mesh welding machines, ton rack welding production lines, automatic resistance welding machines, brazing machines, diffusion welding machines, projection welding machines, seam welding machines, wire and cable optical cable supporting equipment, etc. If you are interested in our welding equipment, please contact us.
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