May 20, 2024

Value of Closeness Impact on producing High-frequency Longitudinal Welded Pipes

The effectiveness of the closeness effect relates to the next three factors:

1. Distance

The closer the adjacent distance between two conductors, the more powerful the closeness effect, particularly when the space backward and forward conductors is near to or has a tendency to zero, the present within the conductors just about all converge towards the adjacent layer, making the adjacent surface The sharp increase of the present at first glance results in heating of adjacent surfaces, for example converging to the positioning of the extrusion point, that is of effective importance to the formulation of high-frequency welded pipe technology. The nearer to the apex from the V position from the opening, the closer the space backward and forward edges from the strip, and then the closeness The more powerful the result, the greater the temperature from the strip edge, until it’s near to the melting reason for the metal, and also the welding is recognized underneath the squeezing pressure from the subsequent squeeze roller. Therefore, the closeness effect mandates that the welded pipe process needs to concentrate on how big the V-formed opening, which is equivalent to Welding heat, quality and speed are associated.

2. Ratio

The effectiveness of the closeness effect is carefully associated with the number of half the thickness from the conductor to the present transmission. The bigger the ratio, the more powerful the closeness effect. On the other hand, the smaller sized the ratio, the less strong the closeness effect. Begin to see the formula: ratio = conductor thickness/2 transmission degree.

3. Frequency

The greater the present frequency, the more powerful the closeness effect in line with the skin effect.

Value of closeness impact on producing ERW steel pipes.

The value of the closeness effect is it can control the flow path, position and selection of our prime-frequency current, guide producing welded pipes, and formulate the welding process. For welded pipes of various specifications, like the manufacture of large-diameter thick-walled pipes, the related frequency and opening have to be selected. After thinking about the result of your skin effect, it’s important to appropriately lessen the current frequency. By reduction of the outlet position, the space backward and forward edges from the blank to become welded and also the current flow path are shortened, therefore shortening the heating some time and growing Improved welding efficiency.

However, since the high-frequency current from the induction coil and also the caused current around the tube to become welded are generally high-frequency currents, there’s additionally a closeness effect together. If placed symmetrically, the present around the tube to become welded is going to be distributed. If placed asymmetrically, the present around the tube blank to become welded is going to be unevenly distributed. Therefore, particularly, the space between your induction coil and also the tube blank to become welded ought to be installed in a tiny top-lower manner, in order to The perimeters from the billet to become welded collect more current. Simultaneously, to be able to strengthen the closeness effect , the space between your inner diameter from the induction coil and also the outer diameter from the tube to become welded ought to be minimized inside the range permitted through the process.