Study on Internal Defect Control and Nondestructive Testing Characteristics of Metal Components Formed by Laser Additive Manufacturing

Author of the article:ZHANG Wushuang

Author's Workplace：Shenyang Aircraft Company, Shenyang110034, China

Key Words：laser additive manufacturing; large metal components; metallurgical defects; pore; unfused

Abstract：Laser additive manufacturing technology for high performance large scale metal components provides a new way for short cycle and low cost manufacturing of large complex key metal components in high-end equipment such as aerospace field due to its prominent manufacturing advantages. The research on the internal defects in laser additive manufacturing process is the premise of realizing the application of laser additive manufacturing metal components in key load-bearing structure engineering. Taking laser additive manufacturing of a titanium alloy main load-bearing component as an example, the basic characteristics of four typical internal defects in laser additive manufacturing of metal components, such as porosity, unfusion, inclusion and microcrack, were summarized, the formation mechanism of four internal defects was analyzed, and an effective process to control internal defects was proposed. In addition, the nondestructive testing characteristics of metal additive manufacturing were introduced.