Selection of welding electrode according to the chemical composition, mechanical properties, anti cracking performance requirements, at the same time, taking into account the welding structure, steel thickness, working conditions, stress, welding performance and other factors comprehensive analysis. When necessary, do welding test, formulate the corresponding technical measures, and then determine the selection of electrode.

The carbon steel welding is generally used with the steel grade corresponding electrode plate, considering the complicated structure, high stiffness, dynamic load, poor weldability, generally used plastic low hydrogen electrode is good, high impact toughness, good anti cracking performance. There are special requirements for the welding position, using the corresponding special electrode, such as electrode, grounding electrode of vertical down welding etc.. In order to improve the welding efficiency, iron powder electrode can be used.

The cooling speed and strength of the weld seam increased, easy to crack, then you can use a lower strength than the parent material level between dissimilar steel welding rods; low carbon steel and low alloy steel welding, steel is generally used with low intensity levels corresponding to the electrode, and considering the factors of low alloy steel, with the use of low hydrogen type is appropriate.

3 for welding of carbon steel, as steel with high carbon content, increases the welding crack, generally used in low hydrogen electrodes and slow cooling methods and suitable preheating, welding and other measures.

The steel weldability is poor, generally with high carbon content, the workpiece thickness, complicated structure, easy to produce welding crack when the steel alloy element for a long time, it is more prominent. General selection of low hydrogen type welding electrode, and take the preheating, slow cooling and other methods and the corresponding welding process and other measures.

In order to ensure the welding quality of workpiece weld shall be clean, no oil, water, rust, paint and dirt, is particularly important for the use of low hydrogen electrode.

On the low hydrogen electrode, electrode by 350 DEG C for 1H before welding, and with baking with use, otherwise easy to produce pores, slag, cracks and other defects. The cellulose electrode generally does not need to be baked, if the moisture, according to the instruction manual temperature welding before baking, but the temperature is too high will destroy the welding process performance.

But the low hydrogen electrode should generally not be repeated baking, prevent skin crisp, shedding of medicine.