中文摘要：

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。

英文摘要：

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.