Heating principle and characteristics of high frequency induction welding
Release time:
2022-11-21
【Summary Description】 High frequency welding uses solid resistance heat as energy source. During welding, the resistance heat generated by high-frequency current in the workpiece is used to heat the surface of the welding zone of the workpiece to a molten or nearly plastic state, and then apply (or not apply) upsetting force to achieve metal bonding. So it is a solid phase resistance welding method. High-frequency welding can be divided into contact high-frequency welding and induction high-frequency welding according to the way that high-frequency current generates heat in the workpiece. In contact high-frequency welding, high-frequency current is transmitted to the workpiece through mechanical contact with the workpiece. In induction high-frequency welding, a high-frequency current generates an induced current in the workpiece through the coupling of an induction coil outside the workpiece. High frequency welding is a highly professional welding method, should be equipped with special equipment according to the product. High productivity, welding speed up to 30 m/min. It is mainly used for welding longitudinal seams or spiral seams in pipeline manufacturing. The principle of high-frequency induction heating: Put the workpiece into the inductor (the coil is usually made of copper tube). When the inductor is connected to a certain frequency of alternating current, an alternating magnetic field will be generated around it. The electromagnetic induction of an alternating magnetic field produces a strong magnetic flux that changes instantaneously. When a heated object such as metal is placed in the induction coil, the magnetic flux will penetrate the entire heated substance, and a large magnetic field opposite to the direction of the heating current will be generated inside the heated substance. Because the resistance in the heated substance generates Joule heat, the large eddy current causes the temperature of the substance itself to rise rapidly, which is the principle of induction heating.
High frequency welding uses solid resistance heat as energy source. During welding, the resistance heat generated by high-frequency current in the workpiece is used to heat the surface of the welding zone of the workpiece to a molten or nearly plastic state, and then apply (or not apply) upsetting force to achieve metal bonding. So it is a solid phase resistance welding method.
High-frequency welding can be divided into contact high-frequency welding and induction high-frequency welding according to the way that high-frequency current generates heat in the workpiece. In contact high-frequency welding, high-frequency current is transmitted to the workpiece through mechanical contact with the workpiece. In induction high-frequency welding, a high-frequency current generates an induced current in the workpiece through the coupling of an induction coil outside the workpiece. High frequency welding is a highly professional welding method, should be equipped with special equipment according to the product. High productivity, welding speed up to 30 m/min. It is mainly used for welding longitudinal seams or spiral seams in pipeline manufacturing.
The principle of high-frequency induction heating: Put the workpiece into the inductor (the coil is usually made of copper tube). When the inductor is connected to a certain frequency of alternating current, an alternating magnetic field will be generated around it. The electromagnetic induction of an alternating magnetic field produces a strong magnetic flux that changes instantaneously. When a heated object such as metal is placed in the induction coil, the magnetic flux will penetrate the entire heated substance, and a large magnetic field opposite to the direction of the heating current will be generated inside the heated substance. Because the resistance in the heated substance generates Joule heat, the large eddy current causes the temperature of the substance itself to rise rapidly, which is the principle of induction heating.
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