1, using the copper and iron electrode (e.g., Z607) during welding, the electrode metal in the iron and copper immiscible, the state of existence to the mechanical mixture, and mixing was uneven. When the electrode in w (Fe), when a 30% increase in the greatly reduced, so that the ductility of the weld metal in the weld of the welding rigid couplings, easy to produce cracks in the weld. Should take short-arc welding, to reduce welding rod swing multilayer welding process measures to prevent welding cracks.

Cast iron cold welding to repair individual casting defects, often using pureNickel Electrodesor nickel-iron, nickel-copper electrode repair welding, Z308, Z408 and Z508. Nickel-copper electrode welding and iron castings, machining performance is better, but the tensile strength of the weld metal is generally low, due to the shrinkage of copper-nickel alloy weld crack resistance than poor. Therefore, this electrode is only applicable in strength is less demanding, but the surface of the casting repair welding processing. Patching the advantages of pure nickel electrodes are the good processability of the weld metal, but expensive, and should not be used in normal circumstances. Still need to pay attention to use this type of electrode operation, in addition to the requirements of the general process welding, repair welding speed not too fast, should be intermittent welding. Each weld length should not exceed 40-50mm, and struck with the Hammers after the solder layer to eliminate stress. After the weld cold not hot welding the second layer, so as to ensure the repair welding work to achieve better results.

3, high-vanadium cast iron electrode is a more economical cast iron cold welding Mig Welding Electrode, such as the Z116 and Z117. This electrode need to use short arc welding, welding and in segmented regressive order, each piece approximately 10-30mm, should adopt a small current, after welding, the same percussion welds, to reduce stress.