Should be based on parent material chemical composition, mechanical properties, combined with the pressure vessel welding performance and structural characteristics, conditions of use and welding methods considering the selection of welding materials, if necessary, be determined experimentally.Weld metal properties should be greater than or equal to the corresponding value of the base material standards or to meet minimum technical conditions prescribed pattern. Various types of steel weld metal requirements are as followsWelding material standards or product samples are listed on Cast Iron Welding Wire performance of the deposited metal (excluding base metal) performance, but performance depends on welded joints weld metal (including welding; material deposited metal and base metal) and welding process, there is no any welding material in Aluminium Welding Rods process can act on welded joints in the heat affected zone and change its properties, from selection of welding materials, it can only consider the weld metal properties needed to ensure the performance of welded joints welded process (especially post-weld heat treatment line energy) cooperation.