铸铁属脆性材料,具有良好的耐磨性,且价格便宜,故大量用于机器零部件的制造。随着铸造技术的进步,已能大量生产高机械强度的高质量材料。但因其石墨和碳化物含量高,用电弧焊焊接时易产生气孔等缺陷,而且,焊接时和焊后铸件受急热急、冷影响,在焊缝附近易形成白口和出现裂纹,故难以焊接。 Cast iron is a brittle material, has good wear resistance, and the price is cheap, so a lot for the manufacture of machine parts. With the advancement of foundry technology, high-quality materials of high mechanical strength have been mass-produced. However, due to its high content of graphite and carbide, easy to produce when welding with arc defects such as porosity, and welding and post-weld castings by emergency heat emergency, cold, easy to form near the weld white and cracks, so Hard to weld.