Cast iron is W (c) ≥ 2.14 of the iron-carbon alloy, cast iron and steel, although the intensity is lower than, less plastic, but it has good wear resistance, shock absorption, casting and cutting, etc. can be. As the cast iron with high carbon content, organization uneven, low plasticity, the material is poor Welding Materials, the welding process can easily produce white, defects such as cracks and pores, so the cast iron welding process should pay attention to choose the appropriate welding methods and welding materials.

To ensure the welding effect recommended the following measures for welding, welding and repair welding of cast iron as a reference when;

1 First, remove the welded parts of the oil, sand, water, dirt, rust and oxidation layer, and depending on the type of defect, groove, playing only the hole and weld pool shape and other preparatory measures.

2 for thermal Welding Wire China, welding parts first preheated to about 500-600 ℃, choose the appropriate current, continuous welding, the welding process always preheat temperature, solder while red hot state immediately after the cover asbestos or other insulation material to ensure slow cooling, which will help graphite fold, in order to improve its crack and processing performance.

3 for cold welding workpiece, melting the base metal in order to avoid too much, reduce the chilling tendency, welding process, maximize the use of low current, short-arc, a narrow bead (each bead length is generally less than 50mm), after welding immediately to hammer weld stress relaxation, to prevent cracking when the temperature dropped to below 60 ℃ under a re-welded.

4 close attention to fill the crater when the arc, to prevent the arc pit cracks.