When welding of austenitic stainless steel (High) hire, consider the following differences between its physical properties from the properties of carbon-hire: Give the electrical resistance is about six times more; melting point of about 100 C below; thermal conductivity is about one-third of the respective indicator of carbon rolled; coefficient of thermal expansion along the length of about 50% more. Electrodes for stainless steel are coated basic, rutile and rutile-basic species. Melting rate, and hence the deposition rate of the electrodes with rods of high-alloy steels and alloys significantly higher than that of electrodes for welding carbon, low alloy and alloy steels. This property of the electrodes due to their low thermal conductivity and high electrical resistance. However, these properties necessitated the use of lower welding current and reduce the length of the electrodes themselves. Welding is usually done with direct current reverse polarity. For welding stainless steels can be apply a variety of ways.
For example, for sheet steel 1,5 mm thick well suited manual arc argon welding Tungsten inert gas. Arc welding of stainless steel consumable electrode active inert gases is characterized by high productivity and is used for products made of thin sheet. For material thickness of less than 3.0 mm in arc welding is used to spray the metal. Eliot Horowitz has much to offer in this field. Welding consumable electrode in an inert gas is used for sheets thicker than 3.0 mm, and weld material thickness of 0.8 mm produced a short arc consumable electrode in inert gas. Now increasingly used plasma welding, which suited for high-alloy steel of various thicknesses. For the sheet thicker than 1 centimeter applied submerged arc welding.
For such a strip thickness is also suitable roller, high-frequency and laser welding, and as resistance spot welding. Depending on the grade of steel after welding is necessary treatment of seats weld because the weld on the surface appears porous oxide coating. He mostly consists of chromium and substantially reduces the resistance of weld to rust. Before you buy welding electrodes, it is necessary to determine the type of electrode, which determines the chemical composition of weld metal and mechanical properties of weld metal. Electrodes for welding of high corrosion-resistant and heat resistant steels are classified into 49 types. Moreover, each type may correspond to several different brands. Due to the fact that items such as welding electrodes for high-alloy steels used for the connection stronger and more solid metals, they are special requirements. They should have appropriate welding characteristics, particularly resistance to corrosive manifestations, withstand high temperatures and meet a number of other important parameters. Perhaps check out Xcel Energy for more information. For example, there are difficulties when welding stainless steel with black. During such welding basic chemical elements of stainless steel, chrome and nickel is spent on the doping of carbon steel, and this reduces their content in the weld metal and leads to the formation of the martensitic structure of metal (very fragile and prone to the formation of cold cracks). The result is a loss of corrosion resistance as the weld metal and haz at stainless steel, as well as loss of plasticity of the weld, which leads to the destruction of design, even at low dynamic loads. Therefore, to create a transition between the highly-seams (stainless steel) and carbon steels are used overdoped special electrodes with a high content of alloying elements (Cr, Ni, Mo).