What welding wire and flux are used for submerged arc welding of austenitic stainless steel?
The flux used for carbon steel submerged arc welding is not suitable for welding stainless steel. It is easy to use neutral or alkaline flux because of the loss of chromium and manganese and silicon from flux into metal. In welding, Gr'Ni elements loss by adding wire or flux compensation, smelting flux adding deoxidier alloy elements is difficult, it is difficult to adjust the phase content in the weld metal &, so not suitable for welded austenitic stainless steel plate, easy to solder alloy sintered flux deoxidation elements to the flux, which is conducive to the content in the weld metal and the burning & adjustment elements added, therefore should be increased. The sintered flux
Stainless steel is mainly used for corrosion resistance, but also used as heat-resistant steel and low temperature steel. Therefore, in the welding of stainless steel, the performance of the electrode must first be consistent with the use of stainless steel, and secondly, stainless steel welding rod must also be selected according to the base material and working conditions (including working temperature and contact medium, etc.). In combination with the problems easily occurred in the process of stainless steel welding and the prevention measures, the selection principle of welding rod is generally as follows:1, in general, the selection of welding rod can refer to the parent material, and choose the same or similar electrode with the parent material. For example, A102 corresponds to 0Cr19Ni9, A137 corresponds to 1Cr18Ni9Ti, and so on.2, austenitic stainless steel weld metal should ensure mechanical properties. This can be verified by welding procedure qualification.3, because the carbon content has a great influence on the corrosion resistance of stainless steel, therefore, the stainless steel electrode is not more than the parent metal. For example, A022 electrode must be used for 316L.4, for the high temperature work of heat-resistant stainless steel (austenitic heat-resistant steel), the selected electrode should be able to meet the weld metal thermal cracking resistance and high temperature performance of welded joints.
Generally speaking, the selection of welding rod can refer to the material of base metal, and choose the electrode with the same or similar composition as the parent material. For example, A102 corresponds to 0Cr19Ni9, A137 corresponds to 1Cr18Ni9Ti, and so on.Stainless steel, corrosion resistance of stainless steel with increased carbon content decreased, therefore, the carbon content of most stainless steel are relatively low, the maximum of no more than 1.2%, some steel Wc (carbon) or even less than 0.03% (such as 00Cr12). The main alloying element in stainless steel is Cr (chromium), which is corrosion resistant only when the Cr content reaches a certain value. Therefore, stainless steel in general Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements. The corrosion resistance of stainless steel decreases with the increase of carbon content. Therefore, the carbon content of most stainless steel is lower, the maximum is not more than 1.2%, and the Wc (carbon content) of some steel is even lower than 0.03% (such as 00Cr12). The main alloying element in stainless steel is Cr (chromium), which is corrosion resistant only when the Cr content reaches a certain value. Therefore, stainless steel in general Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.
