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The Working Principle of High-frequency Welding

Sep. 22, 2022

The principle of high-frequency welding: with the skin effect of high-frequency current can make high-frequency electrical energy concentrated in the surface layer of the welded parts, and the use of proximity effect, and can control the location and range of high-frequency current flow route. Next, follow CHAOCHANG to learn more about it!

 

When the requirement of high-frequency current is concentrated in a certain part of the weld, as long as the conductor and the weld to form a current circuit and make the conductor close to this part of the weld, so that they constitute a neighboring conductor to each other, you can achieve this requirement. High-frequency welding is based on the specific form and special requirements of the structure of the welded parts, mainly using the skin effect and proximity effect, so that the surface metal of the welded parts to be welded can be heated quickly and achieve welding.

 

hf welding machine


High-frequency welding main influencing factors

 

1. The frequency of high-frequency welding has a great impact on the welding, because the high-frequency frequency affects the distribution of the current inside the steel plate. The selected frequency is high or low for the impact of welding is mainly the size of the heat-affected zone of the weld.

 

2. The rendezvous angle is the angle between the two sides of the steel pipe when it enters the extrusion point. Due to the role of the proximity effect, when the high-frequency current through the edge of the steel plate, the edge of the steel plate will form a preheated section and molten section (also known as over the beam), which over the beam section is heated intensely, the internal steel is quickly vaporized and blast spattered out, forming a flash, the size of the rendezvous angle has a direct impact on the molten section.

 

3. Welding method, high-frequency welding in two ways: contact welding and induction welding. Contact welding is a pair of copper electrodes and the two sides of the welded steel pipe contact, induction current penetration is good, the two effects of high-frequency current because of the copper electrode and steel plate in direct contact with the maximum use, so the contact welding welding efficiency is high and power consumption is low. Induction welding is to one or more turns of induction ring set in the outside of the welded steel pipe, multi-turn effect is better than single-turn, but multi-turn induction ring production and installation is more difficult.

 

4. High-frequency welding input power control is very important. Power is too small billet bevel heating is not enough to reach the welding temperature, will cause false welding, de-welding, pinch welding and other non-welding defects; power is too large, it affects the welding stability, billet bevel surface heating temperature is much higher than the temperature required for welding, resulting in serious spatter, pinholes, slag and other defects, this defect is called over-burning defects.

 

CHAOCHANG solid state high frequency welding machine has high quality and high productivity. The power includes 100kw, 150kw and even higher. The solid-state high-frequency welder designs the switchgear and rectification part into one, which has the rectification control function of solid-state high-frequency welder in addition to completing the switchgear function. High-frequency welding machine and induction heating technology is the most efficient, fastest, low consumption and environmental protection for heating metal materials at present. It has been widely used in various industries such as thermal processing and heat treatment.


The Working Principle of High-frequency Welding

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