Welding stainless steel

Except for some restrictions, it can work for welding stainless steel and heat-resistant steel, using the

methods of welding pressure and fusion used in pure or few impurities steel.
You can change the welding process for stainless steel welding and heat-resistant steel shows based on the expected characteristics of the base of the metal, which will be the welding process, such as corrosion and heat resistance.

You must be welding materials used in the same structure basis or higher in some applications a mixture of the metal.

Except for some restrictions, it can work for welding stainless steel and heat-resistant steel, using the methods of welding pressure and fusion used in pure or few impurities steel.
You can change the welding process for stainless steel welding and heat-resistant steel shows based on the expected characteristics of the base of the metal, which will be the welding process, such as corrosion and heat resistance.
You must be welding materials used in the same structure basis or higher in some applications a mixture of the metal.

Important Notes

The surfaces of the weld metal and stainless steel that have been installed and stability of surfaces, you can not polish a lot.
It can work for welding stainless steel that have been installed and stability of either using welding materials of the same composition or using materials for welding low carbon.
Welding must work for stainless steel low carbon materials using welding of carbon only a few, if possible.
Welding must work for stainless steel is a mixture of nitrogen (N) using ordinary materials for welding high mechanical properties enough (free from the mixture of nitrogen N). It must be maintained with the base metal mixing as little as possible.
Centeredness must work fast passes to reduce the torsion or distortion because the high thermal expansion.
Because the thermal conductivity is low, it causes the accumulation of excessive heat when the welding area, for this reason must set limits and restrictions of the heat input.
For a clean metal surface, you should do after welding thermal process, and so on
It can be obtained on the surface free of errors.

Diagram and illustration of Scheffler

A 1 - the usual standard for welding stainless steel Alostnetti

Weld metal contains 4% to 12% delta ferrite (5 -15 FN), for that is resistant to hot cracks.
In welding assembly, in cases when it is requested features such should not be magnetic, with a high resistance against erosion and corrosion, or saturation at low temperatures, then you must choose the metal welding Ostnetti fully.
Must maintain a mixture made with a metal base below 40%, and to avoid significant decline in the proportion of delta-ferrite must maintain a low nitrogen absorption, if possible during the welding process.
You should not do a pre-preliminary initial heating, the temperature should be between passes of no more than 150 ° C.
You must work beginnings of electric arc welding inside the nozzle.
The delta-ferrite magnetic one and won.
Could stainless steel Alostnetti chrome-nickel Cr-Ni is with stainless steel Alostnetti a chrome-nickel-Moulibdn Cr-Ni-Mo assembly but when you take a resistance erosion into account, it must be likely to use and selection of welding materials have the same composition.


A 2 - welding stainless steel full Alostnettih

In metal welding Full Alostnettih, during welding, you must not forget that this type of steel has a high tendency for thermal cracking. In addition, we should pay attention to these points.
It has to be very clean welding area, and should not be allowed to enter and to avoid causing substances such as thermal cracking of the sulfur to the welding area.
Drilling must be completed and nozzles, and stoning to be removed if necessary,
You must work welding scrolling thick enough to avoid longitudinal cracks that can get.
You should avoid creating localized tensions and avoid the use of cutting thick materials during the design.
You should avoid pools or bathtubs large input welding and high temperature so as to maintain the length of a small pill and to keep the tensions after welding as little as possible in the bridle assembly. This situation means that:

- Be limited thermal input (10-15 kJ / cm at most).
- Straight up the seam or swing or oscillation be very limited.

- Do not be the work of an initial heating initial advance, the temperature is between 130 passes (15) degrees Celsius at the most.

F - A - Welding stainless steel Alfreta-Alostnetti

This type of steel called a Alvasin delta-ferrite and Alostnetti on behalf of stainless steel duplexes. This can be grouped steel through welding smelting. Assembly welding works up to 250 ° C. Satiated her fall for temperatures between 250 ° C and 900 ° C, due to be Vases chipped at 475 ° C.
To determine the proportion of delta-ferrite in the weld metal, welding materials alloy containing nitrogen (N) in the same proportion with the base metal, and the quantity of nickel in welding materials slightly higher than what they are in the base metal. We must maintain a ratio of nickel in the mixture less than 40% during the welding process assembly of stainless steel. Welding can work without the use of metal if the extra work of heating and adaptation of leaching (leaching) and Tzudia water after that.
Welding work should work without heating and adaptation of an initial advance, you must not exceed the heat passes through 250 ° C (steel containing chromium almost 23%) or 150 ° C (steel containing chromium by almost 25%).
You can select a little heat input from those used for stainless steel Alostnetti higher. Can heat input welding work 5-25 kJ / cm steel containing chromium 23%, and the heat input 2.15 kJ / cm steel containing chromium 25%.
Steel content is on the Delta-team a large amount, usually tend to get hydrogen cracks. For this reason, it must be maintained on the absorption of hydrogen as little as possible during the welding process (must drying electrodes prior to use and should not be used on a gas containing hydrogen).

F1 - welding of stainless steel with a chrome half Alfreta

It can be welding metals that have the same ingredients or chemical structure or areas affected by the heat of Martnciah structure or dedicated.
You must be in the heating temperature and the initial pre-localization and passes through between 200-300 degrees Celsius.
The heating and localization that is to temperatures between 700-800 ° C after welding, working to calm the Almartnciat, increasing saturation through pelletizing chrome particles, and increase the wear resistance between the grains.
Because of the risk of cold cracking, must be maintained at a low hydrogen absorption during the welding process (must drying electrodes prior to use and should not be used on a gas containing hydrogen).
If asked to be the same color of the base metal and the same thermal expansion properties, then it must use the same extra metal structure does not contain nickel.
If it expected from the weld metal to have a high saturation, and if it is possible to do a thermal process after welding, it can use different materials for the base metal and other welding (eg stainless steel Ostnetti or a mixture of nickel-chrome Ni-Cr).

F2 - welding stainless steel with chrome full Ferrite

Full tends stainless steel Ferrite granules that grow in temperatures in excess of 950 degrees Celsius. With the large-grained structure has it causes low saturation, and can not be re-saturation of the same level or in any thermal process.
For this reason, it must be low heat input welding (welding current is low, the use of electrode diameter is tight, straight welding or a few swing).
The temperature at which the moving steel Alfreta of flexibility to the refraction of steel is at room temperature, has been mapped and identified through beating hammer test. To reduce breakage in areas affected by the heat and to reduce tensions after welding, it must be the work of heating and adaptation of an initial advance on the degree of 200-300 ° C and must be applied in this heat it passes through.
Because of the risk of cold cracking, must be maintained at a low hydrogen absorption during the welding process (must drying electrodes prior to use and should not be used on a gas containing hydrogen).
It is weighted using welding with many passes when using welding materials of high saturation and with different chemical composition (Alostnettih or mixtures of nickel-chrome Ni-Cr). If requested that there be consistency in color with the base metal or welding metal that contains nickel less, the pass cover is performed using welding materials having the same composition with a metal base.
The heating and localization which is the temperature 700-800 degrees Celsius increases the satisfaction of welding and the area affected by the metal, reduces tensions abandoned after resistance welding and restores erosion and corrosion between the granules to the level that it was before.

M - welding of stainless steel with a chrome Almartnciaki

This holds the steel hardness property and stiffness in the air and has a limited capability for welding. To maintain the low hardness and rigidity in the region affected by the heat, it must be the work of heating and adaptation of an initial advance on the degree of 200-300 ° C and heat during the selection of these passes.
The steel that contains more carbon than 0.2% is not fit for welded structures.
The truce made directly after the welding process on the degree of 700 ° C increase the satisfaction of the assembly which was welded heat, and reduce the tensions abandoned after the welding process.
Because of the risk of cold cracking, must be maintained at a low hydrogen absorption during the welding process (must drying electrodes prior to use and should not be used on a gas containing hydrogen).
If asked to be weld metal in the same color of the base metal or weld metal to be free of nickel, it can be done using the cover pass welding materials have the same composition.
Usually it is used for soldering materials Ostnettih have different composition according to German specifications DIN 8556 for welding high-carbon steels, and it can also be used welding materials with mixtures of nickel and chrome Ni-Cr according to the German standard DIN 1736.


Welding of stainless steel with a soft Almartncia chrome-nickel Cr-Ni

The amount of carbon confined to very specific and 0.05%, is working on the formation Martncia Lin won in the base metal of the same composition and in the region affected by the heat.
You must work and adaptation of heating at a temperature of 100 ° C for cutting thick materials and heat must be what passes between 100-150 degrees Celsius.
Because of the risk of cold cracking, must be maintained at a low hydrogen absorption during the welding process (must drying electrodes prior to use and should not be used on a gas containing hydrogen).
The welding materials that have the same base metal combination gives the metal solder containing 0.04% carbon and 5% delta ferrite.

Read More

Vanadium component

Vanadium, element. Vanadium component of a chemical element that has the symbol V., a silvery metallic element unblemished in white, and there are very small amounts in the

earth's crust. Small amounts of it have been found in meteorites.

Vanadium is mainly used in the steel industry where iron is mixed in what is known Besbakh iron vanadium. Vanadium steel strengthens and improves its hardness at high temperatures, also improves its resistance to shocks and corrosion. This alloy is used in corrosion-resistant gear wheel hubs and springs aircraft, cars and motor industry. And make it fast cutting tools as well. Vanadium resists many chemicals but allows passage of neutrons. These qualities make this an appropriate metal for use in corn plants.

And vanadium compounds also have many uses. Vanadium pentoxide third and vanadium oxide chloride are used as catalysts in chemical reactions, and help in the production of synthetic materials and industrial chemicals. It uses vanadium pentoxide and other vanadium compounds in dyeing and coloring industry and glass materials.

Vanadium is an important tracer elements in the human body. Research indicates that the high rate of vanadium in the body x-mas related disease, depression and other disorders.

The atomic number of vanadium and 23 50.9415 atomic weight, density 6.1 g / Sm§ at 20 ° C. And it melts at 1,890 degrees temperature of ± 10 ° and boils at 3,380 ° m.

Known vanadium as a new first time in 1801 at the hands of world metals Mexican Andres Manuel del Rio, but later I think it is pure chrome element. And re-discovered the Swedish chemist Niels Sevstrom in 1830 and gave him the name Vannadis a Scandinavian goddess of beauty.

There is no vanadium solo in nature, but there are united with other elements in more than 60 minerals. For example, there are vanadium in common with uranium metal Alkrnoti radiation and with the sulfur in metal Alebattronat With the lead in Alvanadenec. One of the most important sources of vanadium is Almjnti Altetanomi. It is iron ore found in Finland, South Africa and the Soviet Union (previously).

Read More

Phosphorus does not metallic chemical element symbol P

Phosphorus does not metallic chemical element symbol P
There is in every living cell, and has numerous manufacturing uses. In nature there are

only phosphorus in combinations called phosphate.
And phosphorus is essential to the life of plants, animals and natural growth. Plants soak up phosphorus from the soil, and use it in photosynthesis. People, animals and phosphorus gets to eat the plants, and the types of foods such as meat, milk, and eggs. There are about four-fifths of the human body phosphorus in bones and teeth. Phosphorus, an important part of ATP.

It is the main sources of phosphorus in the industrial use of rock phosphate called phosphorite. Phosphate rock and there are abundant in China and Morocco, and the United States. The Manufacturers manufactures two types of phosphorus from phosphate rock, are white phosphorus and red phosphorus, the chemical forms are called allotropes of phosphorus. Multiple chemical form.

White phosphorus solid waxy substance. In order to be prepared, produces Manufacturers First phosphorus vapor by heating the rock phosphate in the presence of coke and sand. And then the steam condenses to white phosphorus. And unite white phosphorus easily with other elements. It is also, automatically it ignites in air at about room temperature. For this reason, the white phosphorous is very toxic, and can cause serious burns when touched. And phosphorus also flash phosphorous, which radiates in the dark when exposed to air. Manufacturers use of white phosphorus in the manufacture of products such as steel, plastics, pesticides, fertilizers, drugs, animal feed, and water hardness removers and detergents. And detergents made from white phosphorus rich in phosphates, but phosphate detergents can seep into the lakes, and rivers through the discharge pipe, and contributes to the pollution of lakes and rivers that lead to fish and other marine organisms death. Pollution of lakes and rivers.

Red phosphorus and red brown powder, produced by heating white phosphorus, or Ptareidah to sunlight. Aeshetal and red phosphorus, or combine easily with other elements such as white phosphorus, is used in the manufacture of matches and safe, and in pesticides flies.
There is another chemical form of phosphorus, phosphorus is similar to so-called black granite, and can be accessed by heating white phosphorus under very high pressure. Black phosphorus and unite with other elements less than what happens in the cases of white phosphorus and red easily.
The atomic number of phosphorus-15, and atomic weight 30.97376. White phosphorus and melts at a temperature of 44.1 ° heat and boil at a temperature of 280 °. German chemist Hennig Brand phosphorus was discovered in 1669 AD.

Read More

Properties of aluminum

 Light weight aluminum metal, and solid, and has a silver appearance ranges from dark gray depending on the surface roughness. And aluminum is magnetized, which is not soluble in

alcohol, with that dissolves in water in specific forms. Good conductors of heat and electricity. Yield strength of pure aluminum is 7-11 megabytes Backsl, while the aluminum alloy with a yield strength ranging from 200 to 600 MPa and aluminum about one-third the density and stiffness of steel, a retractable and roads where you can mold it relatively easy. Return excellent aluminum's ability to resist corrosion to the thin surface layer is porous and bonded aluminum oxide which is formed when the metal is exposed to air, which prevents the continuation of the process of oxidation. Stronger aluminum alloy to be less resistant to corrosion due to galvanic reactions with copper alloys. This corrosion resistance usually Matnkhvd significantly reduced when there are several salt solutions, in particular the existence of different metals. Have aluminum atoms in the face-centered cubic structure (fcc).

 Aluminium one of the few metals that keeps the full reflection silver when they are accurately powder, which makes it a very important component in the silver coatings. And higher aluminum mirror reflection of any metal at wavelengths (200-400 nm) (in the field of UV) and at 3000-10000 nm (in the infrared), while tin and silver excel in the field of visible light 400. 700 nm and the silver, gold, copper excel in the field of wavelength 700 * 3000.
Aluminum is a good conductor of heat and electricity, and weighs less than copper. Aluminum can be connected to a superior degree with a critical temperature of 1.2 Kelvin ultra-connected, a critical magnetic field of about 100 Gauss

The presence of aluminum in nature
Aluminum metal or aluminum metal is one of the most abundant elements in the earth's crust after oxygen and silicon by the amount of 8.3%.
No Ewagd aluminum metal in nature in pure form free, is due to draw strong aluminum for oxygen, so in oxides or silicates, feldspar, which are more common in the earth's crust are the metals aluminum silicate groups. Can the original aluminum metal as a case that there are secondary in low oxygen environments, such as inside some volcanoes. There are also aluminum metal in metals beryl, cryolite, Algarani, Alaspinl, turquoise. Impurities in aluminum oxide, such as chromium or cobalt gives gems such as rubies, pure aluminum oxide known as Alchorond, is one of the hardest known material at all with that aluminum is a common and widespread element and on a large scale, but the metals aluminum is not considered economic confiscated for the metal. Almost all aluminum metal produced from ore Albuxt AlOx (OH) 3-2x and there are large amounts of bauxite in Australia, Brazil, rich, Jamaica, but the main ore mines are in Ghana, Indonesia, Jamaica, Russia and Suriname. And fused ore mainly in Australia, Brazil, Canada, Norway, Russia and the United States. Because the smelting process is energy-intensive process, the areas where the natural gas supply increases (such as Arab Emirates) have become places of refining aluminum.

Read More