For structural steel welding, the choice of commonly used electrodes:
1. Low-carbon steel structural parts, generally use titanium-calcium type E4303 (J422), E5023 (J502) electrodes;
2. For important structural parts that require high plasticity, toughness, and crack resistance, use low-hydrogen type E4315 (J427), E5015 (J507) electrodes; use AC welding machine to choose AC-DC dual-purpose low-hydrogen electrodes E4316 (J426), E5016 (J506) Welding rod;
3. For thin parts with beautiful and smooth weld surface, it is best to use titanium E4313 (J421) welding rod;
4. It is not possible to eliminate oily embroideries and other dirt and welding structural parts that require greater penetration. It is best to use iron oxide type E4320 (J424) welding rod;
5. For structural parts with a large number of vertical seams, professional vertical welding rod E4300 (J420) can be selected when conditions permit.
(Select the diameter of the electrode according to the thickness of the weldment: 1. When the thickness is 4mm or less, the diameter of the electrode should be lower than the thickness; 2. When the thickness is 4-12mm, choose a 3.2-4mm diameter electrode; 3. When the thickness exceeds 12mm, choose 4mm Welding rod of diameter and above.)
What does the model and row number of the electrode represent?
J507: J stands for structural steel welding rod, 50 stands for the minimum tensile strength of weld metal, 7 stands for low-hydrogen coating, direct current;
E5015: E stands for welding rod, 50 stands for the minimum tensile strength of weld metal, 1 stands for all positions welding, 5 stands for low-hydrogen coating, direct current.