Large aluminum bronze propeller casting processing
14-01-2021
The casting defects of the propeller blades should be cleaned up before welding, especially the loose defects. When removing the defects, the loose defects are often squeezed and not easily exposed; the welding should be heated and melted to verify that the metal below is dense, and then add Filler metal is very important, and it is often overlooked by welders who are seeking fast. The cross-section of the defect removal part should be gently sloped to avoid stress concentration; the welding repair place should be flat or upslope, using smaller welding parameters, and welding repair at a lower temperature. In the process of processing, castings often have casting defects or processing errors that require welding repair. After repair, there should be no defects such as cracks, unfused, pores, and slag inclusions. Not only must the weld repair part have similar mechanical properties as the base material and the ability to resist seawater corrosion, but also minimize the deformation of the propeller blade. The material of the large aluminum bronze propeller blade is: ZQA12-8-3-2, the main chemical composition is (%): Mn11.5～14.0; Al7.5～8.5; Fe2.5～4.0; Ni1.8～2.5; Zn <0.3; The balance is Cu. This alloy has excellent comprehensive mechanical properties, with a tensile strength of 660-735MPa, a yield strength of 280-345MPa, and an impact toughness of 35-48J/cm2.
Get the latest price? We'll respond as soon as possible(within 12 hours)
