Anonim

External plastic elements of cars are made of thermoplastic plastics (thermoplastics). When heated, they melt, and when cooled, they return to their original state. The technology of restoration of such plastic - welding is built on this principle. It allows you to qualitatively close up, for example, cracks and through breaks on bumpers and even repair their brackets. In the same way, all kinds of moldings, expanders and covers are repaired, as well as engine compartment elements, including headlight housings and brackets.

Bumper repair

В зависимости от состава и профиля один ремонтный стержень может стоить от 50 до 150 рублей. Depending on the composition and profile, one repair rod can cost from 50 to 150 rubles. Depending on the composition and profile, one repair rod can cost from 50 to 150 rubles.

Drawing an analogy with metal welding, plastic rods are used instead of electrodes or wire in such plastic repairs. They have a different profile, color, but most importantly - the composition. It is selected according to the marking on the item being repaired. For the production of mounted automotive plastic, only a few types of thermoplastics are used. In 90% of cases it is polypropylene (PP), and the remainder is, for example, ABS plastic.

Bumper marking

Пример маркировки состава пластика на бампере. Штамп расположен с обратной стороны. Буквы «PP» говорят о том, что термопласт имеет полипропиленовую основу. А, например, более знакомый по салонным элементам ABS-пластик имеет соответствующее обозначение. An example of marking the composition of plastic on the bumper. The stamp is located on the reverse side. The letters "PP" indicate that the thermoplastic has a polypropylene base. And, for example, ABS plastic, which is more familiar from salon elements, has a corresponding designation. An example of marking the composition of plastic on the bumper. The stamp is located on the reverse side. The letters "PP" indicate that the thermoplastic has a polypropylene base. And, for example, ABS plastic, which is more familiar from salon elements, has a corresponding designation. Related Materials Image How to restore engines by welding

Plastic welding occurs at high temperatures. For polypropylene it is 400-430 ° C, and, for example, for ABS plastic - 500 ° C. To this temperature, the repair zone and the core are heated with a special hairdryer. Since plastic of the same composition is involved in the process, the original structure of the thermoplastic is completely restored as a result. The resulting compound is in no way inferior to the original monolithic zone. This effect can be compared with modeling from plasticine from one set. Unlike metal welds, traces of plastic repair are completely sanded in the process of preparing the surface for painting.

With the help of welding, they treat, in principle, any damage and even recreate broken elements. As usual, technological freedom of action is limited by the economic feasibility of work in each case. For example, closing one, albeit a large gap on the bumper (taking into account its removal, installation and subsequent local painting) usually costs half as much as buying a new body element and completely painting it. But the treatment of more numerous injuries may become inappropriate. One example: a crack and damage to the mountings of the lining of the mirror of a budget car. Work on the full restoration and staining will cost more than the cost of a new element, which immediately goes into color.

Consider two examples of plastic restoration:

1. Repair numerous through breaks in the rear bumper.

Bumper repair

Задний бампер от Chevrolet Cruze. Многочисленные разрывы, трещина и вмятины. При желании качественно отремонтировать можно и такие повреждения. Rear bumper from Chevrolet Cruze. Numerous tears, cracks and dents. If desired, such damage can be repaired qualitatively. Rear bumper from Chevrolet Cruze. Numerous tears, cracks and dents. If desired, such damage can be repaired qualitatively.

To restore such a bumper is not economically feasible. But you can clearly show the possibilities of plastic welding. To begin with, the master with the help of a building hair dryer straightens numerous dents in several stages and with the help of metal tape fastens the places of breaks.

Bumper repair

Вмятины можно выпрямлять и не снимая бампер с автомобиля. Главное, чтобы был доступ с обратной стороны. В сложных случаях сквозные разрывы фиксируют специальными зажимами, но в нашей ситуации достаточно металлического скотча. Dents can be straightened without removing the bumper from the car. The main thing is to have access from the back. In difficult cases, through breaks are fixed with special clamps, but in our situation metal tape is enough. Dents can be straightened without removing the bumper from the car. The main thing is to have access from the back. In difficult cases, through breaks are fixed with special clamps, but in our situation metal tape is enough.

Preparation for welding begins on the inside of the bumper. At the junction of the breaks, a groove is pierced and its edges are later processed. As often happens, preparatory work takes up the most time.

Bumper repair

Канавку на стыке делают для того, чтобы лучше уложить расплавленный пластиковый стержень и вдобавок компенсировать увеличение итоговой толщины слоя в этом месте. A groove at the junction is made in order to better lay the molten plastic rod and, in addition, compensate for the increase in the final layer thickness in this place. A groove at the junction is made in order to better lay the molten plastic rod and, in addition, compensate for the increase in the final layer thickness in this place.

Bumper repair

Поверхность подготавливают с помощью дремеля (Dremel). Этот универсальный инструмент отлично помогает и в массе других работ. The surface is prepared using Dremel (Dremel). This versatile tool also helps a lot of other work. The surface is prepared using Dremel (Dremel). This versatile tool also helps a lot of other work.

The plastic of this bumper is marked “PP” (polypropylene). The wizard selects a rod with the most suitable profile from a set with this composition.

Bumper repair

При плавлении стержня и канавки получается монолитное соединение, которое полностью повторяет структуру пластика бампера. When the rod and grooves are melted, a monolithic compound is obtained, which completely repeats the structure of the plastic of the bumper. When the rod and grooves are melted, a monolithic compound is obtained, which completely repeats the structure of the plastic of the bumper.

Bumper repair

На финишном этапе мастер дополнительно усаживает и ровняет получившиеся швы, подключая к фену утюжок. At the finishing stage, the master additionally sits and smoothes the resulting seams, connecting an iron to the hairdryer. At the finishing stage, the master additionally sits and smoothes the resulting seams, connecting an iron to the hairdryer.

The front part of the bumper is pre-sanded and the welding process is repeated similarly to the inside.

Bumper repair

Сварка внешних швов идет аналогично предыдущему этапу с внутренней стороной. The welding of external seams is similar to the previous stage with the inner side. The welding of external seams is similar to the previous stage with the inner side.

After welding the external joints, the surface is gradually peeled out and the dents are evened out so that the putty layer at local painting is minimal.

Bumper repair

Процесс непосредственного ремонта подобных повреждений занимает примерно час. С учетом дальнейшей локальной покраски общая стоимость работ в конкретном случае составляет около 17 000 рублей. Это яркий пример, когда выгоднее купить новый бампер. The process of direct repair of such damage takes about an hour. Taking into account further local painting, the total cost of work in a particular case is about 17, 000 rubles. This is a prime example when it is more profitable to buy a new bumper. The process of direct repair of such damage takes about an hour. Taking into account further local painting, the total cost of work in a particular case is about 17, 000 rubles. This is a prime example when it is more profitable to buy a new bumper.

2. Repair the bumper bracket

On the example of the same long-suffering bumper, we consider a more profitable repair. Often, because of the broken wing mount bracket, the entire bumper is sentenced to be replaced. Mostly only his ears suffer, but welding will come to the rescue if the whole bar falls off with them. Such repairs do without local painting, so it saves a decent amount of money.

Bumper repair

Сломанное ушко крепления бампера к крылу - наиболее распространенное повреждение. При ремонте бампер придется снимать. A broken bumper-to-wing mount eyelet is the most common damage. When repairing, the bumper will have to be removed. A broken bumper-to-wing mount eyelet is the most common damage. When repairing, the bumper will have to be removed.

Work begins on the upper side of the bracket. The master processes the edges at the repair site and glues the tape on the back, which plays the role of a temporary base, and welds the plastic rod.

Bumper repair

Для удобства работ по сварке мастер подбирает стержни необходимого профиля. For the convenience of welding, the master selects the rods of the required profile. For the convenience of welding, the master selects the rods of the required profile.

After laying the rod, it is additionally smelted and crimped with special forceps. Further, by analogy, welding is carried out from the inside of the bracket.

Bumper repair

При приваривании нижнего стержня одновременно подплавляется и верхняя часть нового пластикового основания. When welding the lower rod, the upper part of the new plastic base is simultaneously melted. When welding the lower rod, the upper part of the new plastic base is simultaneously melted.

Bumper repair

Подплавленные стержни обжимают щипцами и после остывания пластика получают монолитное соединение. The fused rods are crimped with forceps and after cooling the plastic, a monolithic compound is obtained. The fused rods are crimped with forceps and after cooling the plastic, a monolithic compound is obtained.

At the finishing stage, the master processes the repair zone, cutting out the eye of the desired shape with the help of a dremel.

Bumper repair

В данном примере восстановление ушка крепления обошлось в 1500 рублей. В такую же сумму встанет ремонт кронштейна фары, а за заваривание трещины на ее корпусе возьмут всего 300 рублей. Также можно заваривать и различные бачки. In this example, the restoration of the attachment tab cost 1, 500 rubles. The headlight bracket repair will cost the same amount, and only 300 rubles will be charged for brewing a crack on its body. You can also brew various tanks. In this example, the restoration of the attachment tab cost 1, 500 rubles. The headlight bracket repair will cost the same amount, and only 300 rubles will be charged for brewing a crack on its body. You can also brew various tanks.