Drills for drilling point welding

The content of the article
  1. Peculiarities
  2. How to work?
  3. How to sharpe?

In the modern industry and in the field of automotive industry, widespread use is given by the method of connecting parts by performing point welding. As a result of such welding, the connection is obtained lasting and durable, while the welding process itself is performed rather quickly, which indicates a high performance technique. Often there are situations when the part is welded with spot welding, it is necessary to disconnect, for example, when performing car body repair. Most often, such a question is solved by using the use of a hydroist, but its use is not always possible. In this case, the welding sections are drilled by a special drill. To work, you must install a drilling tool into an electric drill and perform a drilling on slow high-speed speeds – a few minutes after the execution of such a manipulation of the part can be disconnected from each other.


Drill for drilling point welding is used to remove an indefinite welding compound. This cutter allows you to perform a neat back of the welding point, without informing the actions of significant damage to the surface of the part. Often for samples use a tool with a diameter of 8 mm. Find a similar driving tool in profile outlets, but its cost can be quite high. However, the acquired drill will pay for your costs, greatly facilitating the procedure for removing parts connected to the point welding.

In addition, a solid steel mill can be sharpened – the tool can withstand several loop cycles and retains its original properties.

Main advantages Cutters for removing point welding fixtures.

  1. You can perform work on the arvel of welding without prior formation of the recess in the welding point, that is, without inclination. Such a feature of the drill is convenient, as it saves the mass of time and strength.
  2. You can work drill for a long time, exercising consistently drilling several welding points in a row. Even when heated, the drill does not lose its properties.
  3. The operation period of the tool is quite high, as this product is made from high-strength steel grades and has the ability to multiple looping cycles.
  4. After drilling welded points, the dismantled item remains saved to reuse. In addition, the surface of the second billet, to which the dismantled part was attached, is not damaged, and it can be used again by appointment.
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The tool designed to dismantle the welding points are manufactured from alloy steel with the addition of titanium spraying. Release 2 types of such a tool: with one workpie or bilateral. Drill diameters are different – they can be 6, 8 and 10 mm. The selection of the diameter of the drill depends on which size of the welded point, which will have to drill. At the same time, an additional 1.5 mm is added to the diameter of the drill object.

In terms of its structure, the driving tool has 3 main parts.

  • Kern area. The height of this part should be chosen in such a way that it exceeds the thickness of the part 2 mm.
  • Cutting part. To enhance this area, a titanium spray is applied to the metal, which largely strengthens the drill, extends its wear resistance and allows the tool to work, regardless of its heating.
  • Fastening area. This part is designed to fasten the service tool to the electrical drill holder.

On visual features to distinguish a tool designed to dismantle the welding points from other driving analogs is quite simple – The tool axis has a conical appearance, with an angle of 90 °, while the working end part of the drill is flat.

How to work?

At first glance, the simple technology of applying a tool intended for dismantling welding points has several features. Specialists adhere to their work of the following rules.

  1. For operation, an electric drill is used, which has the ability to adjust the speed of revolutions.
  2. A drill job cannot be performed on large speed turns, since the tool pin can be broken due to a large load.
  3. To execute the drilling process, the drill is set to the drilling point in a strictly perpendicular position. No deviations during operation are unacceptable, as it can damage the surface of the resulting detail.
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Before starting the permissions, the work surface must be prepared. Do it as follows.

  1. The surface is cleaned of contaminants and a layer of paint – it will largely increase the quality of the performance and reduce the likelihood that the tool will jump during the drilling. Stripping is performed using sandpaper.
  2. Although the drill can be used without prior curtain of the drilling site, for the convenience of work this procedure is sometimes performed using a separate core for this purpose.

Before starting work it is necessary inspect all welding points and determine whether the diameter tool will be needed to apply For drilling.

Despite the fact that the most chassis diameter of the tool is the size of 8 mm, and other diameters may also be needed.

When preparatory work is completed, you can proceed to drill. For this, the driving tool put in the cartridge of the electric drill and setting the work part of the tool to the welding point, tightly pressed the drill, start drilling, starting with small revolutions. In the process of execution of the drilling, it is important not to hurry and ensure that the metal part is not drilled. After the process of drilling the turning point of the welded attachment, the next step will be the separation of one part from another.

It should be taken into account that the cutter does not drill the welding point completely through, as it makes the usual drill, the principle of its action is different – it drills in a circle in the area of ​​the welding point and allows you to separate the part from the base. After the parts are disconnected, the remaining metal from welding is cut off with a grinder or cutting sanding disk, and in some – especially complex – cases for the separation of parts use chisel with a hammer.

If necessary, drilling the front of the welding attachment use the drill that has a peculiar cone-shaped ledge, With which the centering of the drill is held in the desired position. At the same time, the sharpening drill itself – flat.

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Another effective way of dismantling welding points is considered Using a small crown with sharpened cloths. This device has a felting focus on its design, which performs the role of the limiter. It can be adjusted using a special setup. The crown during operation removes only the area of ​​the welding point, while not affecting the extra pieces of metal parts.

The crown is used in cases where to use the drill is problematic due to damage to the dismantled part – in this case, it is difficult to detect spot welding locations.

How to sharpe?

Like any cutting unit, a tool designed to dismantle the welding points needs maintenance. When the cutting surfaces are blunted, their sharpening is performed, if you perform this procedure correctly and neatly, the tool can be extended, while maintaining all its cutting properties.

The process of sharpening the tool to remove point welding is as follows:

  • Preliminary stripping of the emery of the drill with emery paper is carried out;
  • The cutting side surfaces of the tool are rated using an abrasive circle – this manipulation must be performed very carefully to keep the cutting angle of the cutting edge of the tool;
  • Check the quality of the sharpening and evenness of the cutting surfaces of the drill;
  • The processing process of all edges of the drill with constant control during the operation of the instrument centering to avoid the flow of it from one side.

Dropping the challenge tool must be accurately. If you break the sharpening angle of the cutting part, then the drill will be unusable.

If you do not have a self-sharpening skill of cutting tools, drill for sharpening can be given to a specialized workshop.

How to sharpen the drill to drive out point welding with your own hands, you can learn from the video below.

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