Small titanium alloy additive manufacturing atmosphere protection device and using method thereof

The invention discloses a small titanium alloy additive manufacturing atmosphere protection device and a using method thereof, and belongs to the technical field of additive manufacturing. Comprising an acrylic box body, a flow control box and a PLC control box, a water cooling device, a base plate, a laser cladding instrument and an oxygen concentration detector are arranged in the acrylic box body, an annular pipeline used for inputting argon is arranged along the inner wall of the acrylic box body, and a plurality of air holes are evenly distributed in the surface of the annular pipeline; the oxygen concentration detector is fixed on the inner wall of the acrylic box body and is connected with the PLC control box through a signal line; the annular pipeline is connected with the flow control box, and the PLC control box receives oxygen concentration content data from the oxygen concentration detector and adjusts the argon flow input from the flow control box to the annular pipeline. According to the device,