Welding - an art.Professional welders are appreciated almost its weight in gold everywhere: they do not have enough not only for domestic use but also for the industry.This is largely due to the fact that not every specialist knows all the technological aspects of complex manufacturing operations.
For example, do not all companies know how to cook semiautomatic.This topic is devoted to our article.
General concepts
welding machines currently is a device by which the arc welding is performed.Its feature is that the electrode acts as a steel wire, a welding process is continuously fed into the apparatus.Semiautomatic mechanism is because the welder manually performs continuous feed of wire.
Classification machines
Class A semi-automatic welding device according to the nature of the protection of the weld:
- apparatus for welding metal submerged;
- semi-automatic systems for welding in inert gases;
- machines, where the electrodes using a special flux-cored wire.
Note that the apparatus for submerged arc welding for a long time is not used in the domestic industry, as this type of semi-automatic brewed only old technologies, which are already rare in industrialized countries.Much more common and easy to use semi-automatic welding, process which involves the use of inert gases.In particular, the flux-cored wire often cook this way.
In addition, there is a classification by type and characteristics used in the wire:
- machines, which use solid steel electrode;
- of welding with solid aluminum wire;
- universal model (allows the use of both types of electrodes).
Divide welders and the nature of its mobility:
- Stationary models are widely spread in the environment of the heavy metal industry.
- Their opposites are the portable varieties, which can be transported by one person.
- reasonable alternative to both the above options are mobile units that can be transported on a special car chassis.Since this type of semi-automatic cook in the field, the machine is equipped with the most "tenacious" components.
Note that modern industry produced hundreds of models of semi-automatic welding systems, which can vary considerably in their characteristics.With their help connect not only steel but also aluminum and other metals.In the shops of automobile plants similar mechanisms are involved in the production of car bodies.
modes semiautomatic welding
Since the welder who works with similar equipment, every day we have to deal with several types of metals, manufacturers have introduced their products in a variety of modes of welding semiautomatic.Among them, an experienced specialist will be able to choose the one that is perfect for every particular case.Let's look at their main varieties:
- mode short circuit arc without it.
- large, medium and small-drop types.
- spray flux modes with and without it.
use of a particular type depends on the type of metal being welded, and the purpose of the specific details.To make it easier to navigate the welders, there is also a more detailed classification:
- cyclical welding when using a short arc;
- point type;
- pulse welding;
- version of the jet moving base metal;
- welding provided continuous circular metal transfer.
If carbon dioxide is used (see above), in practical terms often choose pulsed arc mode.As a rule, a constant current, reverse polarity.In this case, the rate of melting metal is not too high, but much more stable arc, and the resulting joint is much stronger.
What should be included?
The kit should include a transformer unit for supplying the burner and the mechanism for supplying welding wire cables and hoses for the supply of inert gas, and a computerized system to control the welding process.The electrode in the area of technological operations applied automatically, which distinguishes these arrangements from the fully mechanical counterparts.All other events welder manually.
Advantages of semi-automatic welding machines
- great advantage is the fact that it is possible to weld metal, the thickness of which does not exceed 0.5 mm.
- rust and even some serious contamination of the weld metal is not an obstacle for quality performance.
- cost of operation (compared to other types of welding) is very low, as the cost of basic supplies is small.
- It is important that with the help of semi-automatic copper wire can be connected to parts of galvanized steel, and the coating itself will remain completely intact.
Weaknesses technology
- If you can not use an inert gas, metal hard enough starts to "boil", with splashes of scale fly a good distance.
- from opening arc radiation is strong enough, so that this point not be forgotten.
Where are most commonly used semi
Despite some negative features, semi-intensively used in the business of repairing cars.In most cases, the technology used in welding of steel and aluminum.The inert gas preferably argon is used.Also, steel is often welded in carbon dioxide.
little about feeder
We have already mentioned why this type of machines are semi-automatic.As a welder by the nature of their work will have to constantly work with the mechanism that feeds into the work area electrode (wire) is not out of place to learn about all the existing types of such devices.Today, just three such distinguished:
- Drawing species.
- Feeders push type.
- Universal versions: semi-automatic welding wire in this case may be any.
Started
As in other cases, that somehow relate to work with welding machines, you will need to pre-configure properly all your equipment.First, you should pick up current, guided by the thickness of the weld metal and the instructions supplied with the unit.As a rule, the documents there is a special table that welding technology is described in detail.Note that at low welding current job machine poor.
guided by the same instruction set the required flow rate of the electrode to the work area.It can be adjusted by appropriately choosing the replacement gears for the gear unit.Be sure to check the current and voltage before work!
If you intend to weld some important technological product, be sure to check that all systems exposed to any test sample.Accordingly, the results of the test should produce a final adjustment (if in fact necessary).If you configure the welding machine, the best evidence of that is smooth and stable arc welded.
Can semiautomatic cooking without inert gas?
Without a doubt, with an inert gas welding works are carried out with maximum quality.That's only for individuals who rarely use welding, the purchase of a gas cylinder is not economically sensible.How real is semi-automatic welding without gas?
An excellent alternative is fluxing or flux-cored wire.In this case it is made of a steel tube, inside which is molded flux.When it burns, spot welding is formed over the local area, protected by his pairs.Note that in this case must be used direct current.
So semiautomatic welding is done without gas.
Cook steel products
first exhibited at the position "Next" switch, which is responsible for supplying the electrode (wire).Then fill the available flux funnel.Important!The holder must be put in such a way so that the supply end of the funnel was precisely in the welding zone, as otherwise the flux will not go there, and you will see a huge amount of fun for the expanding scale.
Open valve on the tank with flux, and then begin to lightly strike sharply on the welding electrode, while pressing the button "Start".This will bring up the arc.You can start working.
How satisfied aluminum welding semiautomatic?
Cook aluminum parts
Aluminium - metal from the viewpoint of the welders are very complex.On the surface there is a thick layer of amalgam, which not only prevents the normal welding of metal, but also very quickly restored after any contact with atmospheric oxygen.Therefore, it is desirable good to know all aspects of this work, because otherwise make a reliable and high-quality weld on the metal you simply do not get.
That's made aluminum welding semiautomatic.
Semi-automatic arc welding
Immediately, we note that this type of work is permitted only aluminum wire, which is used as an electrode.Note that due to its softness, it often forms a loop in the current collector, and therefore they have to use a special pattern designed precisely to use aluminum.
most commonly used argon welding (semiautomatic in this environment it is more convenient to work), and the quality of the gas should pay particular attention.Pressure to select the most difficult: it must be sufficient to guarantee the weld bath, but at the same time does not exceed the limits, as in this case, begins to manifest air leak.
What are the challenges faced by a welder?
- first need to thoroughly clean from dirt and paint all of the parts to be welded.
- Remains sure to clean up the dirt by means of chemical solvents.
- As we already said, you should first make a test weld because the equipment settings may not be too successful.
- It is very important to choose the correct amperage and voltage: weak current is simply not pierce amalgam.In addition, you need to very carefully to protect the weld pool.
All other operations are no different from the above activities.
In what environment is best welded car body parts?
Based on the experience of leading enterprises, we would strongly recommend to use at the body repair only semi-automatic welding of aluminum in the environment of carbonic gas.This approach has many advantages, which we discuss below.
Firstly, the real area of thermal deformation of the material is very small, which enables welding without problems even narrow parts without fear of losing their appearance.Even if the item has already been painted, pigment burn locally, the small size of the lesions.It provides an excellent opportunity to save on the final application and the preparation of parts to it.
Even semiautomatic welding stainless steel performed very quickly and with a minimum of waste.
rate of melting of the wire in this method is very high.It provides excellent productivity and high quality work.The latter circumstance is better, it turns out that the seam to be extremely accurate and high quality.In addition, you do not have to frantically calculating fractions of a millimeter, stykuya Details: losses in the metal is very small, so it can be reliably welded even a very small part.
Even those compounds which are made up of elements of different thickness, will be pleased with the quality of the weld joint.I should add that carbon dioxide is a cheap and semi-automatic welding inverter quickly mastered, even not very experienced staff.
technology welding vertical joints
We do not inadvertently carried the subject in a separate paragraph.The fact that heat rises in this case from below upwards, which prevents the welding quality.And because all the vertical seams are brewed strictly from the top down.The burner should be directed slightly upward, as in this case, much better retention necessary for the weld pool heat.Please note that you need to be welded as quickly as possible, because you will need to prevent the occurrence of streaks of molten metal.Be sure to keep the electrode on the front edge of the tub.
Here is brewed semiautomatic.Good luck with your work!
