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⑴The average tensile strength of commonly used low carbon steel Q235 is 417.5MPa. According to the principle of equal strength, the matching electrode should be the E43 series. The selection of welding rods for manual arc welding of several different steel grades of low carbon steel is shown in Table 2. Table 2 Selection of welding rods for low carbon steel hand arc welding. Steel grade. Welding rod model for general structure. Dynamic load, complex, thick plate structure, boiler pressure vessel, welding rod model for low temperature welding. Welding conditions: Q235E4313, E4303, E4301, E4320, E431 1E4316, E4315 (E5016, E5015) generally do not preheat Q255 generally do not preheat Q275E4316, E4315E5016, E5015 thick plate structure preheating above 150℃ 08, 10, 15, 20E430 3. E4301, E4320, E4311E4316, E4315 (E5016, E5015) generally do not preheat 25E4316, E4315E5016, E5015 thick plate structure preheating above 150℃ 20g, 22gE 4303, E4301E4316, E4315 (E5016, E5015) thick plate structure is preheated at 100~150℃20 RE4303, E4301E4316, E4315 (E5016, E5015) generally does not preheat Note: The welding rod models in brackets in the table indicate that they can be substituted. ⑵The matching selection of submerged arc welding wire and flux is shown in Table 3 for the matching selection of welding wire and flux when submerged arc welding of low carbon steel. Table 3 To match low carbon steel submerged arc welding wire and flux, choose steel number wire flux Q234H08AHJ430HJ431Q255H08AQ275H08MnA15, 20H08A, H08MnAHJ430HJ431HJ33025H08M nA, H10Mn220g, 22gH08MnA, H08MnSi, h10Mn220RH08MnA⑶CO2 welding wire. The solid core welding wire selection grades are H08Mn2Si and H08Mn2SiA. The strength of the deposited metal after welding is relatively high. The flux cored wire selection grades are YJ502-1, YJ506-2, YJ506-3, and YJ506-4. ⑷When matching electroslag welding wire and flux, the molten pool temperature of electroslag welding is lower than that of submerged arc welding, so the reduction effect of silicon and manganese in the flux is weak. Welding wires containing higher manganese and silicon content should be selected. H10Mn2, H10MnSi welding wire and flux HJ360 or H10MnSi welding wire and flux HJ431 are often used.