Induction welding with pressure

Induction welding with pressure Induction welding is a type of pressure welding that uses electromagnetic induction to heat the workpiece. This heating method was discovered in 1831 by Faraday. Induction heating involves contactless heating of a conductive material using high-frequency current. Induction welding with pressure A welding machine with induction coils powered by a radio-frequency electric current creates a high-frequency electromagnetic field that acts on ferrimagnetic workpieces. Eddy currents flow within the workpiece, causing the metal to heat up. This heating is caused by hysteresis. The electromagnetic field within the workpiece repeatedly distorts the magnetic domains. The depth of current penetration into the workpiece depends on the temperature of the metals being welded. Induction welding with pressure It is carried out in an automated manner and is well suited for welding pipes.

Induction welding with pressure

Induction welding with pressure This method involves intensely heating the metal with high-frequency current and then compressing the workpiece or workpieces. This welding process takes only a few seconds, as the heating method is not related to the metal's thermal conductivity or thickness. Energy consumption is very low, as heat is generated only at the surfaces being joined. Induction welding with pressure It is used for roller welding, specifically for joining pipe seams. By using a shielding environment during the welding process, it is possible to butt-join metals and alloys. Due to the absence of contact between the induction heating and the metal, pipes can be manufactured from hot-rolled, unrefined strip, eliminating the need for descaling or special edge treatment.

Steel pipes have high inductive resistance, preventing high-frequency current from spreading around their entire perimeter. The diameter of the welded pipe can range from 10 mm to 100 mm, with a thickness of 0.5-15 mm, and can be made of low-carbon, high-carbon, stainless, or acid-resistant steel. Induction welding with pressure qualitatively connects butt operations, while using an enveloping inductor.

A linear inductor can be used for continuous seam welding of pipes, but the length is limited and must match the inductor size. After this type of welding, excess metal remains both inside and outside. External burrs can be easily removed with a cutter and will not affect the pipe's quality. Internal burrs are difficult to remove and often remain in the pipe. This slightly impacts the quality of the product.

Induction welding with pressure It is widely used due to the speed of the welding process, as well as the flexibility of execution and the ability to adjust it over a wide range of applications. The advantages of this type of welding include:

• fast heating and welding process;
• smooth seam, no scratches;
• high quality of connection and strength of the finished workpiece;
• The disadvantage is:
• difficulty in maintaining a uniform gap between the workpiece and the inductor;
• high power consumption;
• difficulty in removing internal excess metal after welding.