â‘ different intensity level + low carbon steel alloy (or low-alloy steel + low-alloy high strength steel) General requirements for the strength of the weld metal or joints welded metal of not less than two kinds of minimum strength, the choice of the strength of deposited metal electrode should be able to ensure the strength of the weld and joint strength of the lower voltage of not less than the strength of base metal, while the weld metal ductility and toughness should not be less than voltage higher strength and ductility performance of the base metal. Therefore, according to the two lower levels of intensity among the selected steel electrode. However, in order to prevent weld cracks, should be a higher intensity level, poor welding of steel to determine the welding process, including welding specifications, preheating temperature and post weld heat treatment and so on. â‘¡ low alloy austenitic stainless steel + Should be in accordance with the chemical composition of the deposited metal limit values â€‹â€‹in the selection of electrodes, generally used in higher levels of chromium and nickel, plastic and good crack resistance of austenitic steels Cr25-Ni13-type electrode, in order to avoid brittle hardened tissue caused by cracks. However, poor welding of stainless steel should be determined and the welding process specification. â‘¢ stainless steel sheet Should consider the grassroots level, stratified, transition requirements of the Welding Electrode selection of three different properties. Of the primary (carbon steel or low alloy steel) welding, choose the appropriate intensity level of the structural steel welding rod; stratified direct contact with corrosive media, should use the corresponding components of austenitic stainless steel electrode. The key is the transition layer (ie, cross-stratified with the primary interface) welding, must take into account the dilution of the matrix material should be used in high chromium and nickel content, good ductility and crack resistance of austenitic steels Cr25-Ni13-type electrode.