Welding material standard or product samples listed on the  Welding Supplies consumables deposited metal (excluding the base metal) performance, while the welding
Connector performance depends on the weld metal (including welding; material deposited metal and base metal), and welding, any welding materials in the welding process can change its performance in heat affected zone of welded joints, only consider the selection of welding materials, weld metal properties in order to ensure the welded joint properties needed welding process (especially post-weld heat treatment, the line energy) with the The provisions of the JB/T4709-2000 the principle "the performance of the weld metal should be higher than or equal to the lower limit of the standard specified value of the parent material or conditions of the technical requirements to meet the pattern requirements" as the selection of welding materials policy: JB/T4709-2000 the GB divided into 150 low alloy steel according to the use of performance strength low-alloy steel, heat-resistant low-alloy steel and low-temperature low-alloy steel, such a division of fact and their welding characteristics compatible. Some people think that by Welding Material qualification to determine the welding material, "this argument is not comprehensive - for example, welding 16MnR steel, the following electrode through welding procedure qualification: J506, J507, J507R J507G, J507RH, J507DF ... but welding products which grades will have to consider many factors, such as: (1) from the welding equipment to consider, J506 use the AC welder, J507 and DC welding machine; consider â‘¡ from the crack resistance J507RH better than J507; inside the container welding from the labor protection J507DF (low dust) is superior to J507; consider â‘£ improve efficiency iron powder electrode J507Fe than 507. After considering the above factors ultimately determine the electrode grade