E, Mig Welding Rod The first two digits indicate the minimum tensile strength of deposited metal, kg (shall be converted into the corresponding Mpa). The 3 numerals welding position: 0 and 1 can be all-position welding (Ping, Yang, Li, Wang). 2 electrodes applied to the flat weld fillet welding. 4 shows the vertical down welding. 3 and 4 number combinations that type of welding current and medicated skin type. The "R" in the fourth digit after additional resistance to moisture absorption Welding Electrode additional "M" resistance to moisture absorption and mechanical properties of the electrodes of the special provisions, additional "-1", said the impact properties of the special provisions of the welding rod. Example 1: E4315, expressed the low sodium hydrogen type electrode for all-position welding current types DCRP, weld metal tensile strength ≥ 420Mpa (43kgf/mm2). Example 2: E4316, said the low potassium hydrogen type electrode for all-position welding current types for AC or DC reverse Deposited metal tensile strength ≥ 420Mpa (43kgf/mm2). The E4328, said iron powder low hydrogen type electrode, suitable for flat welding, fillet welding current types for AC or DC reverse the deposited metal tensile strength ≥ 420Mpa (43kgf/mm2).

Electrode custody:
1, the Welding Wires Manufacturers custody of basic principles:
(1) Carbon Steel Welding Electrode custody pay special attention to the ambient humidity. The air relative humidity and the higher the temperature, the higher the water vapor partial pressure, the drug skin more easily the absorbent. When the partial pressure of water vapor in air ≤ 5mmHg, the small amount of drug skin absorbent, but is generally recommended in the air relative humidity is below 60%, and left the floor and wall of a certain distance (about 20cm). Temperature of 10-25 ℃ appropriate.
(2) to distinguish between the electrode Model (grades) specifications, can not be wrong.
(3) Electrode transportation, stacking process should be careful not to damage the drug leather, stacking is not too high. Electrodes poor drug skin strength (such as high-strength welding rod, stainless steel welding rod, welding electrodes, cast iron welding rod, etc.)) beware.
2 electrode damp, obvious features:
● after electrode damp, the drug skin color hair deep, crisp sound of metal electrodes collide no.
● Some electrode surface long-term moisture and even anti-alkali "white".
● Some electrode surface, although no special changes, but the welding arc, splashing increased.
 Damp electrode welding performance:
(1) Arc intense, combustion instability;
(2) splashes and large particles;
(3) penetration, prone to undercut;
(4) slag coverage is uneven, rough solder wave, causing pressure pit;
(5) slag removal difficult, low-hydrogen electrodes slag surface pores.
4, damp electrode welding quality:
(1) weld cracks and pores. Electrodes moisture absorption of the water under the action of heat in the welding arc, it becomes a gas, the decomposition of hydrogen, resulting in the formation of welding cracks and pores. Particularly alkaline electrode. Welding rod packing with polyethylene plastic bags, sealed, and can not guarantee the long-term completely moisture-proof.
(2) the mechanical properties of the indicators is low.