Do welding, the welder must be applied pieces of material, welding equipment, welding materials used in the performance and the performance have to understand, and make the appropriate option to ensure the welding quality of the product. Usually based on the chemical composition of steel, mechanical properties, crack resistance, etc., and the shape of welded structures, working conditions, the force and welding equipment and so on. Into account, if necessary, need to test to determine the  Welding Electrode and used process measures to be taken. 1, mild steel welding in accordance with the general strength of the steel grade to choose the appropriate electrode. Also need to steel welding according to the base metal composition of the transition, welded structure, size, shape, groove, and the force and other effects, a comprehensive consideration. Higher cooling rate in the weld, the increased strength of welded joints prone to crack under adverse circumstances, often the choice of low intensity level than the base metal electrode. In case of thick multi-layer welding or soldering treatment after normalizing the situation, you need to weld strength is too low to prevent the phenomenon. 2, the same intensity level of acidity or alkaline welding rod selection, depending on the structure of welded shape (simple or complex), plate thickness (stiffness of the small or large), working conditions (static load or dynamic load) and steel crack resistance and so on. Usually requires a good plasticity, high toughness, high temperature performance, strong anti-cracking, use alkaline electrode. Such as the DC power supply difficulties, the choice of AC and DC welding material. 3, for low-carbon steel and low alloy steel welded joints between dissimilar steels is generally used with a lower strength grade of steel Welding Electrode Manufacturers  accordingly. 4, for the welding of carbon steel, due to the higher carbon content steel, increasing the occurrence of weld cracking tendency can use low-hydrogen electrodes or weld metal with good ductility and high toughness electrodes, and take warm-up before welding , slow cooling after welding process measures. 5, for welding steel, carbon steel are generally higher, and the thickness of large, complex shape, easy to produce welding cracks. Especially when the steel contains more alloying elements, it is more prominent, so, in the welding should be special attention. Generally use low-hydrogen electrodes and preheating before welding, and to take appropriate measures such as the welding process. 6, on the shelf for gravity welding low carbon steel and low alloy steel welding, the electrode can be used gravity. 7, the conditions on the use of special steels and welded structures, can use special electrodes. 8, electrode grade listed in the current scope, for reference only. After preheating the workpiece such as the current reduction than the normal 5% to 15%; DC at about 10% smaller than the exchange; Li Yang welding and welding flat welding current is smaller than the 10% to 15%.