Thresholds of the car - one of the parts car body, which is most susceptible to aggressive influence environment. Temperature fluctuations, high humidity, harsh chemicals that are sprinkled on roads in winter period All this has a very negative impact on paintwork body.
Thresholds on a car, why thresholds, the bottom of doors and arches become unusable very quickly
Sooner or later, the corrosion process starts on the surface of vulnerable parts of the body. First of all, the thresholds, the bottom of the doors, and the arches of the car “suffer”. In addition to rust, the above body parts are regularly affected by torsional and bending moments, as well as strong vibrations. Very often, dents appear on the surface of the thresholds due to the fault of the car owner himself, as a result misuse jack. However, in this case, the thresholds can be repaired on their own. Sometimes you need to replace the inserts, apply a patch, or do other repairs, which will be discussed below.
Corrosion of metal, the cause of rapid corrosion
The corrosive process very quickly turns the metal into rusty dust. For example, out of all the "black" metal produced in the world, 10% rust kills in the first year. The two main causes of metal corrosion are electrochemical and chemical.
chemical corrosion
Chemical corrosion spares neither ferrous nor non-ferrous metals.
This process takes place in an environment that does not conduct electricity(dry gas mixtures, alcohols, various kinds of petroleum products, etc.). The intensity of the process can increase in parallel with an increase in the ambient temperature. As a result, a characteristic oxide film appears on the metal surface.
electrochemical corrosion
For a full run this process a sufficiently thin electrolytic film on its surface, which can be formed by ordinary water. However, the most common cause of electrochemical corrosion is the total use of technical and household salt, which are sodium and potassium chlorides, and are used to remove ice and snow on roads in winter. Not only cars, but also underground utilities suffer from chlorides. For example, only in the USA annual losses from the use of salt amount to more than 2 billion dollars.
Thresholds on a car, what type of thresholds are
According to the material of manufacture, the thresholds are divided into plastic and metal. Plastic variant the cheapest, but also the most short-lived. Thresholds made of plastic almost always go to standard equipment cars and very quickly become unusable.
Metal thresholds are much more durable and reliable. The choice of metal thresholds is quite diverse - the material of manufacture can be an aluminum profile, stainless steel, chromium-containing alloys, etc.
Special for fans car tuning manufacturers custom-make special illuminated linings that are connected to the wiring, and the lamps light up when the doors are opened. At the same time, the thresholds are illuminated with a pleasant light, which not only gives the car original look, but also helps to comfortably get in or out of the car in dark time days.
Removable thresholds, welded thresholds, what's the difference
According to the method of connection with the body, car thresholds can be removable or, as they are also called, movable, as well as welded to the body of the car.
Removable car thresholds are made of plastic or metal, attached to the body with self-tapping screws. In case of need for repair, such thresholds are very easy to remove, perform necessary work and attach back.
Special tools for threshold repair
To repair removable thresholds you will need:
Crafting table.
Anvils.
Mallet, other tools for straightening metal.
To repair fixed thresholds you need:
Crafting table.
Spotter or welding machine.
Manual extraction, for smooth and gentle removal of dents.
Hammers for support and straightening.
Anvils.
Bulgarian.
Other locksmith tools.
Removable thresholds, when it is possible to restore removable thresholds, and in what cases it is better to install new ones
At minor damage repair removable thresholds you can do it yourself. Such work is mainly carried out without the use of a welding machine - it is enough to straighten or draw. If you work carefully, you can even do without painting the part, because although the threshold is removable, such work is considered body repair.
Dents are pulled out carefully, trying not to damage the paintwork. If traces of corrosion are found on the threshold, the degree of damage must be assessed. If it is insignificant, you can get by with a small patch. With a more extensive damage to the threshold by corrosion, there is not much point in repairing - the part is easier and faster to replace.
As mentioned above, quite often thresholds get damaged not only from stones and curbs, but also from an incorrectly installed jack when changing a wheel. Before proceeding with the removal of dents and other repair work, it is necessary to assess the severity of damage, and then select necessary tools and materials.
With small and medium severity of damage, you can repair the welded thresholds yourself. To remove dents or small distortions and not damage the paint, a hood and a plotter are used.
If the dents are deep and it is impossible to pull them out, then a rectangular hole is made in the side of the threshold, into which the anvil is inserted. After that, the dent is carefully leveled with a straightening hammer.
The main methods of repairing car thresholds using welding are the replacement of welded thresholds, and the installation of patches on damaged areas.
If the damage is serious enough, metal incisions are made in several places. After finishing the straightening work, the incisions are closed with patches. If the threshold is damaged by corrosion, the damaged areas are cut out with a grinder, a pattern is made, along which a patch is then cut. The patch is welded to the damaged area.
Today, there are technologies with which you can independently repair the welded threshold without using a welding machine. For this, fiberglass and epoxy glue are used.
What to do if the thresholds and pillar are damaged
If the rack is damaged at the same time as the threshold, they are simultaneously replaced. In this case, the algorithm of actions is quite simple. First of all, cut out the spar of the middle rack. Before you start straightening the side member, you need to make sure that the car body is not damaged. After that, the installation site is thoroughly cleaned, all excess metal particles are removed.
Next, the surface of the spar is leveled and adjusted, after which the mounting and fastening are carried out. welding work- it remains only to install the doors in place and adjust all the gaps.
How can metal be treated to protect against corrosion
autochemical protection
Compositions designed to protect the car body (anticorrosive) are divided into several categories: compositions intended for the treatment of hidden cavities, and compositions for application to the surface of the body.
Means for hidden cavities, in turn, are divided into two categories: the first includes oil-based preparations that have liquid consistency. This allows them to penetrate into the most inaccessible places and fill microcracks in the paintwork. Corrosion protection is provided by the corrosion inhibitors included in the preparation - substances that slow down the corrosion process, as well as a greasy oil film that protects metal surface from contact with moisture. The only one significant disadvantage these drugs - low mechanical strength, and the inability to stay on vertical surfaces.
The second type of anticorrosives for the treatment of hidden cavities are preparations based on paraffin. The corrosion inhibitors included in the composition work only when the preparation is in a liquid state (that is, for some time after application). When the solvent evaporates from the drug, the inhibitors almost completely stop their action. After drying, the preparation forms a wax film, which completely blocks the access of oxygen to the metal. Paraffin-based compounds are not very strong, therefore they are used exclusively for the treatment of hidden cavities in the car body.
For application to the external surface, bitumen-based compounds are used. Bituminous mastics are produced on the basis of synthetic and bituminous resins. They simultaneously perform several tasks: protect the bottom, arches and sills from aggressive environmental influences, and protect against mechanical damage.
Sometimes the manufacturer includes corrosion inhibitors in the mastics, but rather for preventive purposes. The drug will not be able to protect the exposed metal from corrosion. Its protective, “covering” properties are much more important - the mastic must adhere firmly to the surface of the metal, even after hitting stones, curbs and other obstacles.
Mastics are applied to the surface in a thick layer, due to which they are a good sound insulator. Some preparations harden after application and resist mechanical stress well, but may crack, others do not dry completely, retaining excellent elasticity, but poorly resist mechanical stress.
polishes
They are substances in the idea of a paste or emulsion. Are divided into:
Recovery.
Protective.
Combined.
Wax polishes.
In the process of restoring surface treatment with a polish, scuffs, dull (oxidized) areas of paint are partially removed, as well as small scratches. Polishing is done by special polishing machines. In this case, abrasive pastes and compositions of different grain sizes are used.
Soft polishing is performed if the body paintwork is worn out slightly, and it is only necessary to restore the gloss of the surface. Unlike restorative polishing, in this case only finishing polishing compounds are used.
anti-gravel film
Another way to protect the most vulnerable parts of the body, including the thresholds. Each manufacturer of anti-gravel film heavily advertises its product, claiming that it is its film that has all necessary qualities. In fact, such advertising is only intended to justify the high price of the product.
Film cutting is carried out using a computer and special electronic patterns, cutting is carried out by a plotter. Glues the film to any service engaged in tinting glass. It is not difficult to remove the film - all the glue remains on its surface, and not on the surface of the thresholds.
Electrochemical protection
It is an absolutely harmless way for the owner and his car to protect thresholds and other hard-to-reach places auto body.
The principle of operation is very simple, and is based on the principle of interaction of a galvanic pair (car body and electrodes). In this case, the body plays the role of a cathode, steel plates serve as an anode. They are fixed in the most problem areas body, where corrosion is most often formed. As a result of the difference in electrical potentials, the metal of the anodes is oxidized and gives free electrons to the metal of the body, thus restoring it.
In order for electrochemical protection to work as efficiently as possible, it is necessary to install from two to three dozen anodes on a car, the shelf life of which is up to eight years.
Plastic door sill, advantages and disadvantages
Of the advantages of plastic overlays, it should be noted that they are cheap and effective. this method threshold protection. Plastic well protects thresholds from dirt and mechanical damage.
If we talk about the shortcomings, then the plastic lining cannot protect the metal from moisture, which "climbs" under it, contributing to the occurrence of corrosion. Therefore, plastic door sills are recommended to be installed only after anti-corrosion treatment.
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A car is not only a means of transportation, but also a status detail of every person. Therefore, in order to stand out and make the car more modern and practical, some of its “alterations” should be made. Today we will talk about power thresholds, which are often installed on SUVs. Many are interested in the question: is it possible to manufacture and install them yourself? So that this question does not arise again, we will try to clearly analyze everything and finally answer it.
Power thresholds or power steps for a car are quite powerful and expressive steel structures that are attached to the frame of an SUV. For this, welding is used, and in the event that there is no frame on the car as such, such thresholds are attached to the spar with bolts and nuts. They are quite large and differ significantly from the models of thresholds on cars with a monocoque body.
Of course, it is much easier to purchase ready-made power thresholds and drive the car to the station Maintenance where for a fee within a few days the thresholds will be set. However, you can independently engage in the manufacture of such a powerful accessory for your iron horse. Moreover, it is completely inexpensive in relation to materials, because most often they can be made from improvised materials that are “stored” in the garage for a long time. One of these elements is a pipe. Thick-walled pipes will great option for the manufacture of the threshold itself. It is better if it is a pipe with a round cross section, since final result such thresholds will be able to please its owner much more with an aesthetic appearance. But even here there are disadvantages, because the processing of round pipes is more laborious in comparison with square ones.
This feature is explained by the fact that thresholds made of round pipes are not very convenient when stepping on them, and therefore each threshold should be additionally equipped with several steps that have a flat surface.
To begin with, you should draw up the threshold frame itself, for which you need to cut off two symmetrical segments for each door. After that, their side holes should be welded. When determining the size of such a threshold, one should proceed from the dimensions of the vehicle.
After carrying out all the manufacturing work, you should take care of the appearance of the thresholds so that they look no worse than the factory ones. Therefore, they should be sanded, then degreased and primed several times on their surface, and coated with a special solution - liquid chrome, which can be purchased at any automotive cosmetics store. After drying, such thresholds are ready for installation on a car.
For many motorists, it has already become not a necessity, a need to improve the car, but rather a favorite pastime, a hobby. This is the way of life of the car owner, his way of self-expression and the opportunity to distinguish his favorite car among hundreds of thousands of others. Tuning a car body for the most part refers to the aesthetic types of tuning, although they can be improved and technical specifications cars. This is the most obvious type of tuning. The results of improving the body or its individual parts are pleasing to the eye not only of the car owner himself, but of everyone around him. You can tune almost everything - from thresholds and door handles to the trunk lid, hood or roof of the car.
Tuning car thresholds
Beautiful body tuning will give your car a unique look
One of the most popular types external tuning the manufacture of door sills is considered. This is the easiest way to improve the appearance of the car, which almost everyone can do. The easiest way, of course, would be to buy ready-made version overlays and simply install them in right place. Or drive the car to a car service, where they will do everything for you. However, it is much more interesting and cheaper to install and make thresholds on a car with your own hands.
What is needed for this? The first is to make the door sills themselves. You can make them from metal, wall panels or even foam.
Styrofoam thresholds are the easiest to make. To do this, you need a piece of foam, fiberglass, primer paint and putty. From the foam, cut out the necessary threshold in shape and size, cover it with fiberglass several times, glue it in the right place. After that puttying, priming and painting are carried out. However, this option for manufacturing overlays is the least reliable.
The strongest of all, of course, will be metal thresholds, but in order to do everything yourself, you will need skills in working with welding and metal. In addition, the design itself will cost you quite a lot. That is why most often door sills are made from wall panels. They, for this you need a minimum of skills and means. In order to make such door sills, it will be necessary to purchase wall panels, self-tapping screws and drywall guides, as well as anti-corrosion agent, epoxy resin, varnish, paint putty and primer. After acquiring everything you need, proceed to the manufacture and installation. First you need to drill a hole in the body for self-tapping screws and treat everything with an anti-corrosion compound. After that, using self-tapping screws, fasten the drywall guides and, to them, the panels. Then, for greater rigidity of the structure, wrap it with fiberglass impregnated epoxy glue. After everything is dry, you can proceed to the primer, putty, painting and varnishing of the resulting structure.
Upgrading car trunk
Quite often, car owners are also interested in trunk tuning. Someone strives to make it more functional, tries to increase the space or makes paneling, attaches special shelves, clamps for more convenient transportation of cargo.
Others prefer the installation of chrome trim, spoilers and ladders. Such tuning of the trunk allows you to give the car a more sporty and aggressive look,. However, most often it is interesting to owners of large machines.
Still others focus on improving acoustic parameters or trying to make it more convenient to open and close trunks. For example, they make an additional fifth door handle or an electrically conductive lock.
Let's consider how to make a simple tuning of the trunk with your own hands, namely, install chrome lining on the trunk, a handle for closing and an electric lock.
Installation of the electric drive of the lock
Trunk tuning, namely the installation of an electric lock, can significantly simplify the life of the owner of the car. In order to open the trunk, you need keys, and for this you have to turn off the car every time. Installing an electric drive solves this problem. How to install and connect everything? First of all, you need to buy the electric drive itself, a new lock for it, a fuse holder, terminals, electrical tape and wires. You will also need tools: wrenches, screwdrivers and pliers.
After everything necessary materials purchased, proceed to the process of dismantling the old lock. Remove the plastic lining of the trunk and dismantle old lock. After that, you should disconnect the car from the power supply and you can proceed to the wiring. It is best to connect from the cigarette lighter, the button itself can be installed in any place convenient for you. A fuse must be installed between the cigarette lighter and the electric drive button. Next, you make the power supply harness with the help of electrical blocks and lay the wiring along the thresholds of the car in luggage compartment. After that, it is necessary to install the electric drive and the new lock in the already existing hole.
Next, proceed directly to the connection of the electric drive. At the same time, it is very important to do everything in accordance with the instructions of the electric drive itself and observe the polarity, otherwise the lock will not open. After everything is connected, isolate the connections, turn on the battery and check the operation. So, now you have no problems with opening, now you need to simplify its closing.
Installing an additional handle
The second stage of tuning the trunk is the installation additional handle to close the trunk. Everything is simple here too. Most often, such a handle is installed with inside. This will not only make it easier for you to close, but will not affect appearance cars. . For this, an ordinary plastic handle for a car is bought and, using self-tapping screws, is attached to the edge of the inside of the trunk. Thus, you will always have a clean and dry handle, with which you can easily close the trunk.
Installation of chrome lining
After you figured out the functional side of the upgrade, proceed to install the chrome trim. To do this, you just need to buy a chrome trunk lining for your car brand, degrease the installation site and, having removed protective film on the adhesive side, stick it in the desired location.
Similarly, you can decorate your car with chrome trims in other places. Quite often, chrome trims are installed on the hood, radiator grille, or even with their help they make tuning the roof of the car.
conclusions
Body tuning is becoming more and more popular these days. Almost everyone strives to change something in appearance or the functionality of your car. And he tries to do it on his own, with his own hands. After all, most of the work is carried out quite simply and does not require special skills. All you need is imagination, a little material and a desire to do something. And although for the most part body tuning does not affect the functionality of the car, however, this great way decorate your car by yourself.
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Thresholds for a car are very important detail despite its compactness. What are they needed for? Firstly, it makes it convenient to enter the car. It is enough to stand on the threshold, which allows you not to spin around the door. Secondly, it is stylish appearance. Thresholds will decorate any car, become stylish detail that attracts attention. Thirdly, it is protection against various damages. Thresholds allow you to protect the body from small pebbles, during small collisions they take all the impact on themselves, which also protects the car from damage.
You can buy them in the store. Thresholds can be mounted by hand. They are usually made of pipes on which flat sections are made for maximum convenience. The flat areas are covered with anti-slip material. Thus, the entrance to the car interior will be convenient and safe. There are other types of thresholds: in the form of a footboard fixed to the pipe, with a tread for maximum comfort.
Additional thresholds (footboards) can be made with your own hands from pipes. This option is beneficial for several reasons. Firstly, the thresholds sold in stores may not suit a person, in which case it is easier to make them yourself. Secondly, such products may not be reliable enough, fastening parts often does not suit car owners with their weakness. Thirdly, the cost of store thresholds can be greatly inflated. Their quality may simply not match the price.
Why are additional thresholds needed? They make getting into the car even easier. This detail is especially relevant when elderly people and children often drive in cars, because it is often difficult for them to get into the car. In addition, the footrests make it easier to clean the shoes before entering the car, which allows you not to bring dirt into the cabin.
How to fulfill the thresholds
First of all, before making a pipe structure with your own hands, we recommend that you view the training material: photos, videos. This will help you get the job done faster and easier.
The construction will require 2 pipes. Their diameter is determined depending on the needs. The best option is 50 mm. They should be tried on and cut. The threshold is in the shape of the letter C, however, this varies depending on the model of the machine. Corrugated iron is required for the footboard.
Then you should proceed with the installation. From a square-shaped pipe measuring 70 mm, 4 parts should be cut. Each part is fixed on the bolts from the bottom of the footrests of the car. Thresholds are welded to these parts by welding. You can make the design more reliable with the help of scarves.
Pipes, for aesthetics, can be painted with black nitrate. The result is a strong and robust design, withstanding heavy loads and having a high service life. How much time does it take to work? Everything depends on your skills. On average, it takes half a day to make a pipe structure. All sorts of fittings and measurements take a lot of time.
However, the comfort is worth all the effort. Moreover, the work will require the minimum of materials.
The threshold on the car is needed in order to make it more convenient to enter and exit it. Some models have thresholds originally provided in the design, some do not. In this case, motorists will be interested in learning how to make thresholds on a car with their own hands.
Manufacturing process
1. Exists whole line benefits that can be obtained from self-manufacturing. These include:
- saving money.
- the possibility of individual design.
- secure fastening.
- quality materials
Elements of industrial (factory) production are often made of thin and unreliable materials that quickly fail.
2. The disadvantage of self-manufacturing can be a large amount of time that it will take, but the time spent will fully pay off with the quality of work.
3. First you need to choose the material from which the thresholds will be made. The most common are:
- metal pipes of rectangular or round shape.
- foam styrene.
4. Styrofoam threshold, however, will only serve as a decorative and protective element for the body. It won't take a big load. If planned independent production, then this nuance should be remembered.
5. Pipe diameter may vary, the best option there will be a 5 cm pipe.
6. In addition to the material for manufacturing, you will need to purchase additional parts such as:
- brackets.
- suspension.
- washers.
- nuts.
- corrugated iron (if you plan to cover the footboard on top).
7. The threshold can be held on the body with the help of fasteners on the bottom of the body. There are special holes for this.
8. The element itself can be made by welding pipes.
9. Since the shape of the pipe can be different, both types can be used to make posts from a square pipe, on which a round pipe is welded. The result is a very stylish element.
10. If you are wondering how to make a threshold in a car without welding, then you should choose a pipe of a larger diameter or use foam styrene. You can also bend a suitable sheet of metal. But both styrene foam and metal do not have sufficient strength to perform all the functions of a threshold.
11. During the manufacturing process, it is necessary to regularly try on the workpiece to the car in order to eliminate all defects and adjust it to the appropriate size.
12. The finished part must be cleaned, sanded and painted.
13. Paint must be High Quality because she has to endure mechanical impact from flying gravel.
It is best to apply a preliminary coat of primer, and after it a coat of paint.
14. For reliability, you can make an edging with rubber and a layer of stainless metal.
15. If rust or some damage appears during operation, then instead of the task of how to make the thresholds on the car yourself, the task will be how to repair them. 
16. First you need to dismantle the old parts and clean the entire surface.
17. After alignment, they are attached to the car.
18. You can paint after fixing.
19. To protect the surface from corrosion, you can use special means. Anti-corrosion protection is not recommended mounting foam, since at home there is no way to put it qualitatively.
Knowing whether it is possible to make a threshold for a car, each car owner can choose between working with his own hands and contacting the service. Making any parts for a car on your own is often more pleasant for motorists than entrusting your own vehicle strangers.
