Welding of band saws is considered one of some types of application of contact butt welding.
This technology is considered to be quite narrow in application, but at the same time quite popular.
, Welding of band saws is considered one of some types of application of contact butt welding.
This technology is considered to be quite narrow in application, but at the same time quite popular.
In this area, the basic principles can be distinguished: almost all materials used are difficult to weld; the developed section is represented by a cloth or a knife; maximum loads are applied to the welding seam with constant use; the accuracy of the saw setting affects the level of loads.
There are restrictions on the use of various types of band saws.
This is due to shape changes, melting and other inconveniences during heating.
If we compare resistance welding and butt welding equipment, we can conclude that the design of the former is much simpler, and therefore more economical.
However, not everything is so smooth, resistance welding has certain limitations.
For example, during the preparatory operation, sections of the web may appear irregularities, deformations and burrs.
This happens because there must be other settings and parameters.
But in practice, it is simply impossible to achieve such settings.
In addition, a significant change in the result may occur due to the influence of the contact surface of the electrodes and the clamping segments, their settings and position.
Thus, when welding band saws using reflow, inaccurate settings can lead to a change in the annealing process of the blade.
And when welding resistances, adjustment errors can lead to complete damage to the final product.
Advantages of resistance welding of band saws: cheapness; simplicity of the method; suitable for welding of different-caliber canvases with different widths.
Welding of reflow strips is devoid of almost all the disadvantages of resistance welding.
But this does not negate the presented requirements for the condition of the electrodes and their surfaces.
You should be extremely attentive to the steps and sequences of the teeth of the web.
With standard settings, it will not be difficult to track these parameters.
Remember that then it is recommended to make calculations of the seam in the lower part when trimming the used canvas.
Also, never place the seams in the hollows.
Ignoring the presented rule leads to a decrease in the technological properties of the seam, as well as to a decrease in its useful cross-section.
Due to these same factors, it is not recommended to place the suture in the upper part of the tooth.
This can lead to distortion of the canvas and wear of the equipment.
Since the seam does not fully warm up due to the seam position being too high.
Which in turn leads to incomplete precipitation of the surface of the entire canvas.
In addition, never install stitches within the area of the cavity located on the front of the tooth.
During operation, this section of the web receives the maximum load, and the location in this part of the seam can lead to a breakdown of the mechanism.
The location of the welding seam on saws designed for metal has its own nuances.
Most of these mechanisms have a variable pitch, so it is necessary to install seams on the teeth themselves at the location of those teeth with a smaller pitch.
Such manipulations and installation tricks provide a wide seam with a larger area, which means that the characteristics and strength are improved.
Do not forget to make sure before welding that those teeth that fall into the zone of precipitation and melting should be cut to the place where the seam is supposed to be.
09 Martha 2017
