Metal AM process with in situ inspection

1. An inspection system for inspecting a part while said part is being produced by an additive manufacturing technique, said system comprising:

an additive manufacturing apparatus having a build tray, said additive manufacturing apparatus being configured to fabricate said part layer-by-layer on said build tray;

an automated tool holder carrying a tool configured to deposit, add or weld layer-upon-layer of material to form a cross-section of said part;

said tool holder and said build tray being configured to move relative to one another along a path defined by a build program; and

an inspection device comprising an eddy current probe attached to said tool holder, said inspection device configured to scan a layer of said material in situ and detect defects in said layer once said layer is deposited, added or welded; and

wherein said tool holder alternately arranges said tool and said inspection device in a working position for use such that said tool holder fixes said tool in the working position for depositing, adding, or welding said layer of said material and thereafter said tool holder switches said tool with said inspection device into said working position for scanning and detecting defects in said layer of said material;

wherein the tool and the inspection device are both attached to the holder at the same time.

2. The system of claim 1 , further comprising an actuator on which the tool holder is mounted, wherein the actuator is positioned above the build tray of the additive manufacturing apparatus.

3. The system of claim 2 , wherein the actuator moves the tool holder along at least one axis in a three-dimensional space.

4. The system of claim 3 , wherein the actuator includes a plurality of tracks defining movement along said at least one axis, the tool holder being connected to said tracks and configured to move along said tracks via said at least one actuator.

5. The system of claim 1 , wherein the additive manufacturing apparatus includes at least one actuator, said at least one actuator moves the build tray in at least one axis in a three-dimensional space.

6. The system of claim 1 , wherein said inspection device is configured to provide non-contact, non-destructive testing of said layer of said material being scanned.

7. The system of claim 1 , wherein said inspection device is configured to provide contact-based non-destructive testing of said layer of said material being scanned.

8. The system of claim 1 , wherein said inspection device comprises an electromagnetic inspection method.

9. The system of claim 8 , wherein said inspection device comprises an eddy current probe.

10. The system of claim 1 , wherein said tool holder comprises a rotary hub and wherein the rotary hub rotates to alternatively to arrange the inspection device and the tool in the working position.

11. The system of claim 10 , wherein said inspection device comprises a spectroscope.

12. The system of claim 1 , wherein said inspection device comprises an acoustic inspection sensor.

13. The system of claim 12 , wherein said inspection device comprises an ultrasonic transducer.

14. The system of claim 1 , further comprises a spectral imager mounted to said tool holder, said spectral imager being alternately arranged with the tool and said inspection device, wherein said spectral imager device disposed in the working position is configured to scan said layer of said material in situ and detects defects in said layer.

15. The system of claim 1 , further comprising a cutter mounted on said tool holder, said cutter is configured to cut or mill at least a portion of said layer of said material where a defect is detected.

16. The system of claim 15 , wherein upon said defect being detected by said inspection device, said tool holder arranges said cutter in the working position so that said cutter removes said portion of said layer where the defect is located.

17. The system of claim 16 , wherein after removal of said portion of said layer is completed, said tool holder switches said cutter with said tool so that said tool is disposed in the working position, said tool being configured to deposit, add, or weld additional material within the removed portion to patch said layer.

18. The system of claim 16 , wherein said cutter removes an entirety of said layer of said material; and

wherein said tool holder switches said cutter with said tool so that said tool is disposed in the working position, said tool being configured to deposit, add or weld said material to form a replacement layer.

19. The system of claim 15 , wherein said inspection device scans an entirety of said layer of said material and is configured to detect defects in said entirety of said layer, and only then, said tool holder switches said inspection device with said cutter so that said cutter is disposed in the working position, and said cutter removes all portions of said layer of said material where said defects are located.

20. The system of claim 15 , further comprising a storage unit to save location data of each defect detected by the inspection device, said cutter using said location data to remove all portions of said layer of said material corresponding to said location data.

21. The system of claim 1 , further comprising an inspection controller connected to said tool holder, said controller controlling said tool holder to alternately provide said tool and said inspection in said working position;

wherein said controller controls relative movement between said tool holder and said build tray along a pre-programmed path during inspection by the inspection device.

22. A method of inspecting a part while said part is being produced by

an additive manufacturing technique, said method comprising the steps of:

using an inspection system, which includes:

an additive manufacturing apparatus having a build tray, said additive manufacturing apparatus being configured to fabricate said part layer-by-layer on said build tray;

an automated tool holder carrying a tool configured to deposit, add or weld layer-upon-layer of material to form a cross-section of said part;

said tool holder and said build tray being configured to move relative to one another along a path defined by a build program; and

an inspection device comprising an eddy current probe attached to said tool holder, said inspection device configured to scan a layer of said material in situ and detect defects in said layer once said layer is deposited, added or welded; and

wherein said tool holder alternately arranges said tool and said inspection device in a working position for use;

arranging said tool in said working position to deposit, add or weld at least one layer of said material to form a cross-section of said part;

switching said tool with said inspection device via said automated tool holder such that said inspection device is disposed in said working position;

providing relative movement between said tool holder and said build tray while scanning said at least one layer with said inspection device; and

detecting one or more defects in said at least one layer using said inspection device

wherein the tool and the inspection device are both attached to the holder at the same time.

23. The method of claim 22 , wherein said inspection system comprises a cutter mounted on said tool holder, and wherein said method further comprises the step of using said cutter to cut at least a portion of said layer where said one or more defects are present.