In industry, widespread electric and gas welding. Each species has specific advantages, but it also has some negative qualities. Different consumables are used for the welding process. Rutile electrodes are no exception.
Rutile electrodes are commonly used in manual arc welding and surfacing.
The technological process of welding can not occur without a welding electrode. For each type of welding developed a specific type of electrodes.
The welding electrode itself is made of two parts. This is its core and appropriate coating. The core is made of metal and coated with a special powder that is applied evenly. The composition of the coating largely affects the quality indicators of the welding process, it depends on what material can be welded with this electrode.
The advantages of rutile electrodes are: the ability to easily ignite, create an arc and a tendency to create pores.
Recently, an electrode with a special coating called rutile has become very popular with welders. What are rutile electrodes? Basically, the coating is made of titanium oxide and has great advantages compared to others. This is due to several reasons.
First of all, the coating does not emit toxic gases. This is very important, since it is directly related to the health of the worker. Such electrodes make it possible to significantly reduce the time of the welding process. Materials with rutile coating can be used for work in a vertical plane.
When welding various types of steel, it is required to take into account the level of technological parameters of the electrodes:
- welding in space;
- kind of welding current;
- the possibility of the appearance of pores;
- the presence of hydrogen;
- the appearance of cracks.
Rutile electrodes should not be used in work at too high temperatures.
All the above characteristics must be considered when choosing the brand of electrode. It strongly depends on the coating used. They can be:
Consider welding electrodes that have a rutile coating. The basis of such a coating is rutile concentrate, which is more than 50%. The weld, which is obtained after welding with a rutile electrode, consists of low carbon steel. The resulting metal seam has a high resistance to cracking, if compared with similar electrodes equipped with an acidic coating.
The main parameters of the weld, obtained by rutile electrodes, resemble welding carried out by E42 electrodes. This type is endowed with little sensitivity to the occurrence of pores when a change in the length of the arc occurs. Electrodes are not sensitive when a watery surface is being welded or an acidic surface is required.Back to table of contents
Positive qualities of rutile electrodes
If we compare them with similar species, we can distinguish various positive qualities:
- Gas emissions are non-toxic. They cause minimal harm to the welder's health.
- When operating with alternating current, a stable and strong arc is maintained.
- In case of spraying there is a slight metal loss.
- Slag crust is easily separated.
- High-quality seam formation.
The composition of rutile electrodes includes aluminosilicates, carbonates and rutile mineral.
When the coating has a lot of carbonates, the alkalinity of the slag increases. As a result, the weld metal receives a small amount of silicon, a low oxygen content is detected. There is an increase in impact toughness, the resistance of the metal increases, the formation of cracks is reduced to zero.
In the case of high humidity of coatings, a small amount of hydrogen is observed in the metal joint, the formation of pores is practically minimized.
Due to the presence of TiO2 in electrodes having a rutile coating, they are able to easily re-ignite an arc. Moreover, this process does not require the removal of the film from the electrode crater, since with a large amount of TiO2 it has semiconductor conductivity properties. It is able to start an arc without coming into contact with its core with the metal being welded. Such a positive quality rutile coating allows you to perform work with short seams, in which you have to very often interrupt the burning of the arc.
To carry out welding work, you can use only rutile quality electrodes that have been dried for more than 24 hours. If they have been calcined at high temperatures, pores may appear. Their appearance may be associated with an increase in current strength when welding is performed with T-joints, when thin metal is boiled and large electrodes are required.
When welding steel having scale, such electrodes do not form pores. They are endowed with high resistance in the case of cracking, when compared with similar electrodes, characterized by an acidic coating.
Basically, this type has technological indicators that are much better than those of electrodes with a different coating. The use of rutile provides excellent constancy of the work of the arc when welding is carried out with a constant electric current.
Electrodes are distinguished by a low sprinkling rate, ease of separability of slag formations. This type is considered the best for welding on the ceiling, as well as in the vertical plane. This simplicity arises from the fact that this type of coating during the melting process begins to form titanium compounds, which instantly appear on the surface, floating up from the molten bath.
In addition, such titanium coatings greatly increase the viscosity of the slag, especially at times of lowering the temperature. These slags are called "short."
Technological properties of rutile electrodes:
- ease of ignition of the arc;
- minimal pore formation at the time of ignition;
- high resistance to fatigue characteristics of welding joints.
Due to the high content of metal powder in rutile coatings, there is a decrease in the amount of carbon in the weld, sulfur is distributed more uniformly.Back to table of contents
Composition and technological characteristics
Such electrodes are made of different types of welding wire, most often manufacturers use the brand CB-08A. This wire is coated with solid flux consisting mainly of natural titanium dioxide (rutile natural mineral).
Flux incorporates a gas protection component made of organic matter.
Therefore, this type is used only after drying. Wet coating is not able to cope with the occurrence of hydrogenation seam.
The standard regulates the size and shape of these electrodes. Product marking should have the designation "P", indicating the brand of flux. Focusing on this letter, you can easily find rutile products and not confuse with other types of products.Back to table of contents
Functions of the electrode coating.
The main purpose is considered to be arc welding of various types of steel, carried out manually. It is quite affordable to carry out metal surfacing on the surface of such electrodes.
Welding works are carried out with any types of low carbon steels. You should not use rutile electrodes when you need to weld accessories that will be operated at high temperatures.Back to table of contents
Main modes and their nuances
Electrodes having rutile flux can work in conjunction with any type of electric arc welders. The magnitude of the welding current corresponds to the standard indicators.
These electrodes have no restrictions regarding the type of weld. Such details can be obtained ceiling joints, with success carried out welding work in a vertical plane. Joints are made end-to-end, overlapping joints are applied. To work with this type of electrodes does not require special preparation of the ends. It is known that they perfectly cook the surfaces covered with paint.
Excellent quality is observed with corner or butt welding. Thanks to the rutile coating, it became possible to obtain the highest quality of the seam when the joining works of the base metal and material are performed after fusion. In this case, the appearance of residual stresses is almost minimal.
It is somewhat more difficult to perform welding work with such electrodes when it is necessary to perform a T-joint, and the parts must have a considerable gap between the ends.
For such a case, it is necessary to use electrodes of large size with a thick covering layer. Such filler material is always difficult. It is necessary to increase the welding current, and this leads to an increase in the risk of obtaining a porous weld.