The meaning of welding rod grade

1. The letter "J" in the welding rod brand represents structural steel welding rod. 2. The first and second digits indicate the minimum tensile strength of the deposited metal, the unit is kgf/mm2 (should be converted into the corresponding MPa), and it is divided into 10 levels: 42, 50, 55, 600, 70, 80, 85, 90, 10 (100). 3. The third number indicates the type of coating and the type of welding power source. 4. The symbol after the third digit indicates a special purpose, such as: "Fe" means iron powder welding rod. “X” represents the special electrode for vertical downward welding. “G” represents special electrode for pipeline welding. "GM" means special welding rod for capping. "D" means special electrode for bottom layer welding. “Z” stands for gravity welding rod. “GR” stands for high toughness electrode. “LMA” stands for Moisture Resistant Welding Rod. "H" stands for ultra-low hydrogen welding rod. “R” stands for toughness electrode. "DF" means low fluoride electrode. “RH” stands for high toughness ultra-low hydrogen welding rod.