摘要
利用光内送粉熔覆喷头,对弧形工字樑结构件进行了激光熔覆成形,采用激光加载补能方法,避免了薄壁结构件的端部塌陷问题。利用不同离焦位置光束可熔覆不同层高熔道的特点,采用变姿态、径向扫描的方法,熔覆成形了结构件不等高扇形部分;采用变姿态、周向扫描的方法,熔覆成形了结构件的弯曲弧形部分。成形件的最大相对尺寸误差为-5.9%,硬度稳定在690HV左右,显微组织致密均匀、无气孔、无裂纹。
Arc-shaped flanged beam structural parts are formed by the laser cladding technology with an inside-laser powder feeding head. The collapse of ends in thin-wall structural parts is avoided with the method of laser energy loading. Due to the feature that tracks with different layer heights can be cladded by using laser beams at different defocus positions, the unequal-height fan-shaped parts can be formed with the variable-attitude radial-scanning method and the curved arc-shaped parts can be formed with the variable-attitude circular-scanning method. The maximum relative dimensional error of the formed parts is -5.9%, the hardness is stable at about 690 HV, and the microstructure is dense and uniform without holes and cracks.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第9期117-124,共8页
Chinese Journal of Lasers
基金
国家自然科学基金(51675359)
国家重点研发计划(2016YFB1100300)
关键词
激光技术
激光熔覆成形
光内送粉
弯曲复合结构
端部塌陷
laser technique
laser-cladding forming
inside-laser powder feeding
curved composite structure
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