Machinery and equipment / | What are the electrodes used for arc? |
During the welding comfort and the execution of these works is directly dependent on the quality of the electrode used in the welding of a product. The quality of the products affected by the following factors:
- Use of expired electrodes
- The poor quality of the electrodes
- Improper storage conditions applied electrodes.
In arc welding occurs at temperatures of 3000 degrees allows welding of the article is hot. The result is a one-piece product that can withstand a lot of pressure.
The advantages of welding include:
- High strength seam formed
- Economical use of financial resources
- Connectivity components that are made of different grades of steel.
- Perhaps to repair cast iron products.
Electrical arcing caused by the passage of electric current between the electrode and the workpiece.
Arc welding are divided into several types:
- Welding consumable electrode. In this case, the electric arc melting of the electrode next. To protect the welding process weatherproof, so-called protective gas, e.g., CO2, helium and argon.
- Submerged arc welding. This served as a welding electrode under flux layer. Burning arc is due to gas bubble formed between the layer of flux and metal being welded. The advantages of this method include an increase in the depth of weld penetration and greater protection of the metal from the environment.
- Manual arc welding. This method uses electrodes coated. When melting creates a specific protective layer, which guarantees protection from exposure to the atmosphere. This method provides a more accurate weld seam formation, its doping, eliminated non-metallic inclusions and, most importantly, ensures the stability of the arc. This method is considered the most difficult among all these.
To reduce the cost of welding work should seek to minimize the consumption of electrodes. This is achieved by the following methods.
Decide - Do I need a continuous seam in this connection. If possible, it is possible to make a point or intermittent.
Use electrode of larger diameter. This is not always acceptable, but the thickness of the weld metal is often enable the use of two options to choose the diameter of the electrode. For example, 3 or 4 mm. When using electrodes of 4 mm in diameter their consumption will be less.
It should also be noted that the larger the diameter of the electrode, the lower its price. And since they have to be changed less frequently during welding, this leads to an increase in productivity of welding work.
The best option is to use a selection of the electrodes of the brands that are recommended for your hardware manufacturer.
As the core of the electrodes uses modern welding wire OK Autrod 12.51. The characteristics of the electrode depends on the chemical composition of the wire. Applications are about 500 brands of coated and uncoated electrodes, which can be consumable and nonconsumable (tungsten electrodes).
The coated electrodes are made of metal rod, on which a special coating, consisting of a variety of powder components, connects the adhesive mass, often with liquid glass.
The use of welding electrodes LB 52U, as well as coating and welding wire, you can work with both ordinary steel and non-ferrous metals and alloys. To arc welding of carbon steels used consumable electrode with rutile coating or mixed.
With the help of rutile (ANO-4, MP-3, OZS-12), which is titanium dioxide, provides arc stability and increases the strength of the weld joint. This type of electrode has a higher price, but it is offset by a number of advantages compared with other types.
Electrodes coated with ilmenite (ANO-4I, MR-3M) - they used a compound of titanium dioxide and iron. The resulting weld is not only robust, but also flexible compared to other types of electrodes LB 52U.
Welded joints at the electrodes with basic coating (SSSI-13/45), which comprises a fluorine compound and a carbonate, has plastic properties, keeps hitting and tolerates fluctuations in ambient temperature. Not very good sealing members to the presence of rust and oil on the edges.
When welding non-ferrous metals are used non-consumable electrodes which are made of materials with a high melting point metal or refractory. This, for example, can be tungsten with various impurities.
See also:
Inverter welding ferrous metals
Welding of aluminum: practical tips and tricks
Advantages and disadvantages of gas welding