Why not use 422 electrodes and 502 electrodes on the site? (Shanghai Kunming Railway)
Do you know the difference between 422 and 502?422 is common steel electrode, 502 is manganese steel welding rodTo put it simply, look at the material to be weldedSimply, the welding on the site are designed, if you really don't understand why, in a word: design requirements!
422 is common steel electrode, 502 is manganese steel welding rod. They have different welding materials. The simple point is that if the 422 manganese steel is used, the weld seam will crack and will not be welded.
J422 welding rod is lower than steel standard. The strength of J502 is the same as that of steel bar, which is the reason of using J502 welding rod.Different reinforcement materials, the electrode tensile strength is not the same. The strength of the steel bar must be the same as that of the steel bar. The strength of the welding rod once, the steel bar will appear the weld organization intensity is low and the crack; the welding rod strength is higher than the steel bar, the welding seam and the reinforcement will have the bigger peeling force, similarly will crack.Model: J422, brand: E4303 belongs to titanium calcium type low carbon structural steel welding rod. It is suitable for low carbon structural steel with welding tensile strength Q235.Model: J502: E5003, belongs to titanium calcium type low alloy structural steel welding rod. Low alloy structural steel suitable for welding tensile strength Q345 grade.
