Nodular cast iron manufacturer: when welding, how to do it? The specific welding method is like this. Next, I will give you a detailed introduction.

Nodular cast iron is different  gray cast iron. It is spheroidized to improve its mechanical properties. It is mainly used to manufacture castings with high mechanical properties. It can also replace carbon steel  alloy steel in a certain range to manufacture castings with high strength  complex shape. Die casting aluminum is often used as spheroidizing agent of nodular cast iron,  magnesium is the obstacle of graphitization, which results in white structure in the whole process of electric welding. If the cooling rate is too fast during welding, austenite in the heat affected zone will change into martensite  form hardened structure, which is more difficult to process after welding. Because of its excellent compressive strength  plastic deformation, it is  easy to cause cracks, but its welding quality is higher than that of steel castings. So how to weld?

Electrode arc welding

During the cold welding of nodular cast iron, EZNiFe-1 (Z408), eznifecu (Z508)  other welding rods are mainly used for welding repair of non machined surfaces,  the process is the same as that of gray cast iron.

Gas welding

For the gas welding of nodular cast iron, rzcq welding wire is used, such as the nodular cast iron welding wire containing magnesium. The composition of welding wire is c3.5-4.0%; si3.5-3.9%; mn0.5-0.8%; s ≤ 0.03%; P ≤ 0.10%; mg0.035-0.06%; y0.03-0.04%. Neutral flame  weak carbonization flame shall be used for slow cooling after welding.

That's how ductile iron is welded.