Stripping welds after welding with a corner grinder

Now welding is one of the demanded technologies for the connection of metal structures, because you will receive the uniformity of the material in the fastening sections only when welded. The resulting welds provide a reliable connection of individual parts of metal structures, do not miss water. The procedure for stripping welds after welding plays a small role for this purpose.

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Stripping welded joints is an ineffective step after the welding work, which is regulated by GOST 9.402-80. To carry out work of this type, various technologies are used, which are different on the processed iron surfaces, for example, grinding with a mechanical method, chemical etching, neutralization.

Blending Welds on Inside Corners

Peculiarities

Stripping welds after welding is a necessary procedure. In the process of such work, there is a strong heating of metal elements to the melting point, which leads to voltage inside and a change in the form. In addition, small particles and slag will form on the seams. Currently, there are a large number of all kinds of methods and methods to remove welding seams from metal products. This can be done with the help of special tools (sandpaper, milling cutter), and manually using wire brushes.

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Why is needed?

A strong internal voltage in the metal structure, which is formed during welding, can lead not only to the deformation of the part, but also to its further rapid destruction. In addition, in places where there was uneven heating, the structure of the crystal lattice may change. This leads to a deterioration in various chemical and physical and mechanical properties of the material. Special heat treatment makes it possible to restore the internal structure of metal parts, as well as improve their properties. The procedure allows you to make the metal strong enough and resistant to the formation of corrosion.

You can get rid of welding seams on metal in various ways:

Heat treatment

It is used if it is necessary to clean the residual stresses in the inside. This type of processing is required after welding thin.Walled metal structures. To perform such a procedure, you should slightly heat the part, and then cool it according to a given temperature graphics.

This method is carried out in three stages. At the first stage, you need to heat the area around the weld, then you need to leave the element heated for a short time, in the end everything is cooled. This method allows you to restore the properties of the material (plasticity and strength), remove the internal voltage and ensure the durability of welding. But at the same time, it has a number of disadvantages: irreversibility (if you could not conduct processing in accordance with the temperature schedule, then it will be almost impossible to correct the marriage), expensive professional equipment is required for this procedure.

Heat treatment allows you to silently remove the entire slag from the seams.

To control the temperature regime, various aggregates can be used: a pyrometer and thermal imager (electronic devices, they measure the necessary indicators remotely), thermal coloring and thermal pencil (change their color when changing the temperature).

Mechanical restoration

This method allows you to clean the slag, metal “spray” and scale from welds by grinding. For a mechanical type, you will need either a wire durable brush, or a special abrasive disk. At industrial enterprises, such elements are fixed in grinding machines (often in domestic conditions, such a device is called a corner grinder). Before processing, it is worth picking up a suitable circle.

The optimal option for welding seams on stainless steel will be aluminum zirconate, since it does not have corrosive effects on such products. Special petal abrasive nozzles are also often used. The latter must have petals created on a fabric basis. They are considered the most reliable in comparison with other varieties. Elements with petals on a fabric basis and with aluminum zyluminia are applied from zirconate, but cleaning is also distinguished by a special level of quality.

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The simplest and cheapest option will be a paper.Based nozzle. Most often they are made with spraying from aluminum oxide. But the price level will fully correspond to the level of quality of the grinding of the seams. Remember that such nozzles should be selected taking into account the type of work. If you need to clean the seams in hard.To.Reach places in the corner complex metal structures, then the size of the abrasive element of the nozzle is better to take a small size.

For the scraping of the upper worst layer with warts and slag, it is permissible to use the larger nozzle. In this case, it will not be able to damage the material itself.

The finish processing is always carried out by the smallest grinding tool, so during such procedures several types of nozzles of different sizes will be used at once.

Chemical processing

The best result can be achieved by combining the mechanical and chemical processing of the seams. The latter can be carried out through etching or passivation. This type is convenient for cleaning the angle. Ending most often acts as a preparatory stage before machining. It should be performed using special chemicals. They will allow you to create a reliable coating resistant to corrosion formation.

In addition, this procedure makes it possible to remove the places where oxidized chrome or nickel accumulates. If they are not removed in a timely manner, they can be affected by corrosion. If the welds are small, then you can simply apply the chemical composition to their surface. Sometimes the part is completely dipped in the substance. After etching, passivation should be performed, which will allow the metal to give additional strength. Passivation is a part processing with a special solution, which allows you to form a protective film on the surface of the product that does not allow to form a corrosive layer.

After chemical processing, it is necessary to wash off all the remaining solutions of the solution with water. In this case, wastewater must be disposed of as carefully as possible. After all, the liquid will contain a large number of harmful heavy metals and acids. They can be a little neutralized with alkalis.

After all this is carefully filtered and only then poured into a safe place.

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Mechanical stripping of welds with corner grinders

The most popular and easiest way to machining. Cleaning the corner grinding machine or simply corner grinding. Thanks to this method of exposure to the weld, you can clean of scale, oxide, burrs and traces of run. The method has a very significant advantage. Low cost. Special nozzles are selected for stripping. Abrasive circles of a certain thickness and diameter.

However, the highest quality result is achieved subject to combining two methods of cleaning. Mechanical and chemical. Processing welded compounds with chemicals can be performed by one of two methods: etching or passivation. For objectivity, both.

Etching

Processing is performed immediately before mechanical grinding. A special chemical composition is used, which allows you to create a uniform layer on the surface. The etching method is successfully used in cases where you need to remove run. The etching of individual sections of the connection or workpiece is practiced completely. The latter version implies that the workpiece will be completely immersed in the solution.

In case of complete dipping the workpiece, there is no strictly regulated time to perform the procedure. With this method of exposure, the withstanding period is determined individually, depending on the composition and type of metals. It must be emphasized that stripping the welded joint will be more effective if you resort to etching by passing. Its peculiarity lies in the fact that the joint receives a very significant bonus: its strength characteristics increase.

Passivation

The essence of the process is as follows. For processing the metal surface, a special chemical composition is used. After applying it, a film is formed over the entire plane. It prevents the aging of metal and the formation of corrosion. From the point of view of the interaction of reagents, this looks like this: the oxidants soften the upper layer of steel, interact with it and dissolve free particles that are not a component of a metal blank. In addition, the composition activates formation on the surface of the protective film.

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Corner welds must be cleaned in accordance with the requirements of the rules. According to its provisions, the quality of cleaning is controlled by the replaced master, and the results are displayed in the technological map of the repair of welding joints.

From metal surfaces

For perturbation for metal, whether it is removing the layer of old paint or removal of rust, masters use roots. They look like a brush made of metal twisted or not twisted wire inserted into a metal glass, or a disk of the same wire.

From the masters who used the straps for peeling work on metal, you can hear complaints that small pieces of wire fly off from the nozzle and dig into clothes.

Depending on the quality of the penderly work you want to carry out, the thickness and rigidity of the brushes are selected. It should be borne in mind that the metal wire used in the brushes leaves on the processed surface of the scratch. Therefore, to remove paint, for example, from the car body, it is better not to use them. They can be useful only for removing rust and paintwork from hard.To.Do places.

For sparing metal, it is better to use special circles from the silicone of carbide silicone (XCS). They are usually black. For these purposes, Clean and Strip are more resistant to wear. They are blue, have a similar structure, but consist of nylon threads.

This treatment circle is available in 2 options: for a drill and for an angular grinder. A distinctive feature of its from other types of nozzles for removing paint from metal in that it does not clog and does not damage the metal in the form of scratches. They are also successfully removed by welding, rust, various sealants and anti.Corrosion coatings.

Clean and Strip circles have good wear resistance, and they can be used until completely washed.

Often to remove paint from metal use petal nozzles for corner grinders. They are a disk with sandpaper glued on its plane in the form.

For black surface processing, nozzles with large grain size are used. For finishing work, it is necessary to select a peeling circle with fine sandpaper. Although this sandpaper quickly wear out and clogs with the remains of the paint removed, it can be simply restored enough. How to do this, you can understand from this video.

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Question:

When welding, welding several sheets, a seam is formed. Its stripping and is called flush. It is necessary to understand what requirements are imposed on the cleaning of such a seam. What regulatory documentation is the requirements of these requirements?

Mechanical cleaning of the docking area

How to clean the welds with a corner grinder? The easiest way of mechanical exposure is manual stripping of a corner grinder. In this case, you can get rid of defects that are inevitable during welding:

Many note the efficiency of this method, and this is a confirmed fact.

Stripping welds will be made professionally if you choose the right grinding circle.””

Stripping rust

It is no less difficult to remove corrosion from iron. The work is performed by the same nozzle in the form of a metal brush.

Important! Only surface stripping. Performing this nozzle, you can strongly scratch the surface

When corrosion is removed, the surface should be treated with additionally coarse.Grained sandpaper.

Tig welding Walking The Cup techniques tips hacks on a stainless steel plate #Shorts

The corrosion of the body is a frequent problem of all cars that are operated or stored in raw conditions. Timely removal of rust in such cases the key to the safety of the car body. To clean up, you need a cup type of different stiffness and sandpaper

At the time of removal of corrosion, you must be careful and try not to damage the metal

Work on cleaning metal from corrosion or paintwork is very time.Consuming and dirty, so patience should be gained to do everything efficiently

It is also important to observe safety precautions during the operation of an angle grinding machine

How to clean up welds after welding is performed

(Last updated on: 03.Ten.2017)

Welding is today one of the most common technologies for fastening metal parts, because it is when welding surfaces that it is possible to obtain a homogeneous connection that does not pass moisture and provides strong fastening of elements. However, the welded seam itself is a weak point of the structure, which must be protected from premature damage and destruction. Therefore, the mandatory stage of any welding work is the cleaning of welds after welding. The need for such work is the norm enshrined in GOST 9.402-80 “Unified system of protection against corrosion and aging. Lacoclance coatings. Preparation of metal surfaces before staining “. To perform such work, a different tool can be used that has a different effect on the processed surface. This is ordinary mechanical grinding, and chemical etching, and neutralization. Each of these technologies has its own characteristics and indications for use.

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How to clean the seam after welding

How to clean the welds properly

The most common mistake of all novice welders pick up a corner grinder and cut off the whole metal to the damn grandmother, which he only melted into the seam. This comes from the fact that you are very conscientiously doing your job. Well, if seriously, then the weld after welding you need to slightly cost the grinder with a machine and at the end as if licking it with it. Thus, the welding will remain almost untouched and the welding seam will acquire a neat look and will look like a single whole. It is interesting that with this approach, the place where welding is located no longer cracked and does not disperse, and it cracked with all kinds of loads only nearby, but on the condition that the thickness of the metal will not be large about 2. 3 mm.

When stripping a weld, it is important to understand that as many metal as possible should remain after processing the welding location of the corner grinder. The disk for cleaning should be selected with a thickness of at least 3 mm. If the food disk is thinner, then with the slightest press it will bend and this will lead to a disk cutting back with the next time at all. What could be dangerous for your life. Therefore, if you are not confident in your tool, it is better not to start food work.

After you welded two steel elements, all kinds of warden and slag in the region of 2-3 centimeters around the seam also need to be cleaned at the same time, they also need to be cleaned at the same time, otherwise after you paint this place without cleaning to the end, then The paint will immediately reveal everything and it will not be terribly beautiful. In places where it is impossible to go over a corner grinder use a flat chisel or a file instructed on the seam and a hammer is knocked down and slag are knocked down. A well.Cleaned product is visible not with an armed gaze.

If a sheet of iron has been welded to any frame, then the welding location should be cleaned with the beginning of the corner grinding and then you must definitely go through the wire disk. This is a metal round clip with boiled inside with a nut. Long thin steel wires are fixed inside this clip. You remove the disk after stripping, put the wire disk and go through the welding places for them, thereby removing any garbage that remained after welding (wounded, slag). In order not to waste time on the rearrangement of the cutting disk on a wire, you can have a second corner grinder on hand on hand on which a wire disc will already stand. The place of leaf sinking to the profile is very difficult to reach a reference circle for this, you need a wire circle.

Ferts are very laborious and require great attention, strength and patience. In many ways, it will depend on them whether the welded product will look beautiful and accurately, aesthetically pleasing and professionally after painting. If you want your work to appreciate it, then it must be done in good faith.

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