Systems and methods for joining space frame structures
A strut-and-node truss design that is applicable to all space frame structure designs can be made with using robotic (semi-autonomous and/or fully autonomous) or telerobotic assembly/joining. Nodes can include a 2-dimensional weld path in an effort to reduce the complexity of having to weld in 3-dimensions. Furthermore, each strut to node connection can be concentrated in a small area where each weld can be performed robotically from a fixed position that only requires the robotic weld head to swivel in a small operating window to reach each joint.
1. A truss structure comprising:
a node member comprising:
a main body;
annular grooves each extending from an outer periphery of the main body toward an interior region of the main body, wherein the interior region defines a void within the main body; and
weld surfaces each facing the interior region, covering an interior end of a corresponding one of the annular grooves, and being opposite the outer periphery, wherein all of the weld surfaces face in directions that converge at a work point;
struts, wherein each of the struts is inserted into a corresponding one of the annular grooves; and
weld nuggets each on a corresponding one of the weld surfaces and extending to a corresponding one of the struts.
2. The truss structure of claim 1 , wherein each weld surface is planar, and a weld axis perpendicular to the weld surface intersects the work point.
3. The truss structure of claim 1 , further comprising anvils each extending from the main body and within a corresponding one of the annular grooves.
4. The truss structure of claim 3 , wherein the main body is monolithic with the anvils.
5. The truss structure of claim 3 , wherein the anvils are attached to the main body with fasteners.
6. The truss structure of claim 1 , further comprising coupling members each extending within a corresponding one of the annular grooves and configured to securely couple the node member to one of the struts that is inserted into the corresponding one of the annular grooves.
7. The truss structure of claim 1 , wherein a thickness of the main body between one of the weld surfaces and the corresponding one of the annular grooves is substantially consistent about the periphery of the corresponding one of the annular grooves.
8. A truss structure comprising:
a node member comprising:
a main body;
annular grooves each extending from a periphery of the main body toward an interior region of the main body; and
weld surfaces each covering an interior end of a corresponding one of the annular grooves, wherein all of the weld surfaces face in directions that converge at a work point;
struts, wherein each of the struts is inserted into a corresponding one of the annular grooves with a terminal end at the interior end of the corresponding one of the annular grooves; and
weld nuggets each on a corresponding one of the weld surfaces and extending to a corresponding one of the struts.
9. The truss structure of claim 8 , wherein each of the weld nuggets forms a ring on a corresponding one of the weld surfaces.
10. The truss structure of claim 8 , wherein the main body defines openings extending through the weld surfaces and the struts define lumens that are in fluid communication with each other through the openings of the main body.
11. The truss structure of claim 10 , further comprising a cap member sealing the interior region of the main body from an external environment, the interior region being in fluid communication with the lumens through the openings.
12. The truss structure of claim 8 , wherein each strut extends along a longitudinal axis and the terminal end of each strut defines a face that is directed at an angle with respect to the longitudinal axis.
13. The truss structure of claim 12 , wherein the angle is oblique for at least some of the struts.
14. The truss structure of claim 12 , wherein the angle is zero for at least one of the struts.
15. The truss structure of claim 8 , wherein the face is parallel to the interior end of the corresponding one of the annular grooves and the corresponding one of the weld surfaces.
16. The truss structure of claim 8 , further comprising a reflector element coupled to the node member.
17. A method comprising:
inserting struts into corresponding annular grooves of a node member with terminal ends of each of the struts at an interior end of the corresponding one of the annular groove, the node member comprising weld surfaces each covering the interior end of a corresponding one of the annular grooves, wherein all of the weld surfaces face in directions that converge at a work point;
aligning a weld device at a work point; and
while the weld device is aligned at the work point, welding at each of the weld surfaces to weld each of the struts to the node member.
18. The method of claim 17 , wherein inserting the struts comprises advancing each strut within a corresponding one of the annular grooves until a coupling member extending within the corresponding one of the annular grooves securely couples the strut to the node member.
19. The method of claim 17 , further comprising securing the node member to an assembly platform with a node alignment mechanism of the node member.
20. The method of claim 17 , further comprising:
inserting anvils each into a corresponding one of the annular grooves; and
securing each of the anvils to the node member with fasteners, wherein inserting the struts comprises advancing the struts over the anvils.