New idea of high frequency induction welding
Release time:
2021-12-22
【Summary Description】 The traditional way of induction welding is to directly pass the welding pipe through the copper tube or copper plate winding induction coil, through the skin effect and proximity effect to the squeeze roller before the welding zone steel belt edge heating and through the squeeze roller extrusion after the formation of welding seam. Then this model and welding process are almost all high-frequency induction welding methods, applied to a variety of pipes. So is this the only high-frequency induction welding method? Of course not.
The traditional way of induction welding is to directly pass the welding pipe through the copper tube or copper plate winding induction coil, through the skin effect and proximity effect to the squeeze roller before the welding zone steel belt edge heating and through the squeeze roller extrusion after the formation of welding seam. Then this model and welding process are almost all high-frequency induction welding methods, applied to a variety of pipes. So is this the only high-frequency induction welding method? Of course not.
We know that in the high frequency induction welding process, what is the role of the induction coil? The role of the induction coil is only to provide heat energy for a certain length of the V-shaped area in front of the extrusion roller, and the area is heated to the forging temperature, as long as the V-shaped area is heated to meet the temperature required to form a weld after extrusion forging.
Then the non-perforated coil inductor can also realize the heating of skin effect and proximity effect on the V-shaped area, because the skin effect is the characteristic of induction heating, and the proximity effect is determined by the electromagnetic effect of the out-of-phase current at the edge of the steel strip. It can be seen that the non-perforated coil inductor can also realize the heating requirements of high-frequency induction welding, however, due to the application efficiency of non-perforated coil inductors on magnetic lines of force is a relatively challenging issue, its induction efficiency is not as high as that of traditional induction welding coils, and it is generally necessary to configure magnetizers to improve heating efficiency (similar to silicon steel sheets for medium frequency weld annealing inductors).
Although the defect of this kind of induction welding method is very obvious, the coil efficiency is not high, but the corresponding welding thickness is very thin (less than 1mm) of the pipe product field, and the product with special material characteristics requirements, it should have its special use effect in the special product field, and the traditional induction heating sometimes can not meet the requirements of some products.
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