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.
