Alloy structural steel welding low bar:
 Usually the corresponding choice of the electrode according to the strength of the Welding Electrodes grade according to the weldability of steel, the transition of the composition of the base material, the welded structure size, shape, and the groove and force other factors also need for comprehensive consideration, the cooling rate in the weld greater strength, increased weld joints prone to cracks under adverse circumstances, often the choice of some of the Tungsten Welding Electrodes  is lower than the strength of the base material, after normalizing the case of thick plate multilayer welding or welding required to prevent the phenomenon of the weld strength is too low. Requiring plastic, out of high toughness, good low temperature performance and crack resistance strong, use alkaline or high toughness electrodes, generally the choice of ultra-low hydrogen type welding of medium carbon steel or cast steel, high toughness electrodes or supplemented by preheating process measures.