Portable friction stir welding apparatus having a crawler which supports a motor for rotating a Friction Stir Welding tool and is coupled to a drive mechanism for urging the crawler along a predefined weld path on work pieces. The crawler can comprise one member or a set of two or three physically s
Portable friction stir welding apparatus having a crawler which supports a motor for rotating a Friction Stir Welding tool and is coupled to a drive mechanism for urging the crawler along a predefined weld path on work pieces. The crawler can comprise one member or a set of two or three physically separated members each rotatably coupled to the friction stir welding tool. The friction stir welding tool for making the weld is rotatably coupled to each member and restricts axial displacement of the physically separate members relative to each other. The members are adapted to engage rails on the work pieces which provide at least one of guiding, alignment, fixturing, torque compensation for the members as the friction stir welding tool is rotated and the crawler is moved along a joint.
대표청구항▼
What is claimed is: 1. A friction stir welding apparatus comprising: a first member having at least one bearing surface for rotatably receiving a friction stir welding tool; a second member having at least one bearing surface for rotatably receiving the friction stir welding tool; the friction stir
What is claimed is: 1. A friction stir welding apparatus comprising: a first member having at least one bearing surface for rotatably receiving a friction stir welding tool; a second member having at least one bearing surface for rotatably receiving the friction stir welding tool; the friction stir welding tool having a first bearing surface rotatably coupled to the at least one bearing surface in the first member, before the tool is inserted into at least one of two work pieces, and a second bearing surface rotatably coupled to the at least one bearing surface in the second member, before the tool is inserted into the at least one of two work pieces; and an engagement member coupled to at least one of the first member and the second member, wherein the engagement member is adapted to apply an engaging force in a direction perpendicular to the longitudinal axis of the friction stir welding tool to engage the at least one of two work pieces to provide torque compensation for the friction stir welding apparatus while the friction stir welding tool is rotating. 2. The friction stir welding apparatus of claim 1 wherein the engagement member is adapted to provide guiding for the friction stir welding apparatus while the friction stir welding tool is rotating. 3. The friction stir welding apparatus of claim 1 wherein the engagement member is adapted to provide alignment for the friction stir welding apparatus while the friction stir welding tool is rotating. 4. The friction stir welding apparatus of claim 1 wherein the engagement member is adapted to provide fixturing for the friction stir welding apparatus while the friction stir welding tool is rotating. 5. A friction stir welding apparatus comprising: a first member adapted to receive a friction stir welding tool; a second member spaced from the first member adapted to receive the friction stir welding tool; wherein the friction stir welding tool is coupled to the first member and the second member, before the tool is inserted into at least one work piece; a first engagement member coupled to the first member, wherein the first engagement member is adapted to engage a top surface of the at least one work piece; a second engagement member coupled to the second member, wherein the second engagement member is adapted to engage a bottom surface of the at least one work piece; and wherein the first engagement member and the second engagement member are adapted to apply engaging forces in a direction perpendicular to the longitudinal axis of the friction stir welding tool to the top and bottom surfaces of the at least one work piece to provide torque compensation for the friction stir welding apparatus while the friction stir welding tool is rotating. 6. The friction stir welding apparatus of claim 5 wherein the first member and the second member are spaced apart by a distance sufficient to receive the at least one work piece, and wherein the first engagement member and the second engagement member are adapted to provide at least one of guiding, alignment, and fixturing for the friction stir welding apparatus while the friction stir welding tool is rotating. 7. The friction stir welding apparatus of claim 5 further comprising: a drive structure coupled to at least one of the first member and the second member, wherein the drive structure is adapted to urge along the at least one work piece as the friction stir welding tool is rotated to form a joint. 8. The friction stir welding apparatus of claim 5 wherein the first engagement member coupled to the first member is adapted to engage a first rail on the top surface of the at least one work piece, and wherein the second engagement member coupled to the second member is adapted to engage a second rail on the bottom surface of the at least one work piece. 9. The friction stir welding apparatus of claim 8 wherein each of the first rail and the second rail on the at least one work piece is a raised member. 10. The friction stir welding apparatus of claim 8 wherein each of the first rail and the second rail on the at least one work piece is a channel member. 11. The friction stir welding apparatus of claim 8 wherein each of the first rail and the second rail on the at least one work piece traces a path that is straight, curved, or a combination of both. 12. A friction stir welding apparatus comprising: a first member adapted to receive an upper section of a friction stir welding tool; a second member spaced below the first member adapted to receive a middle section of the friction stir welding tool; a third member spaced below the second member adapted to receive a lower section of the friction stir welding tool; the friction stir welding tool coupled to the first member, the second member, and the third member; an upper engagement member coupled to the first member, wherein the upper engagement member is adapted to engage a top surface of an upper work piece; a middle engagement member coupled to the second member, wherein the middle engagement member is adapted to engage a bottom surface of the upper work piece and an upper surface of a lower work piece; and a lower engagement member coupled to the third member, wherein the lower engagement member is adapted to engage a bottom surface of the lower work piece; wherein the upper engagement member, the middle engagement member, and the lower engagement member are adapted to apply engaging forces in a direction perpendicular to the longitudinal axis of the friction stir welding tool to the top and bottom surfaces of the upper and lower work pieces to provide torque compensation for the friction stir welding apparatus while the friction stir welding tool is rotating. 13. The friction stir welding apparatus of claim 12 wherein each of the upper engagement member, the middle engagement member, and the lower engagement member is adapted to engage a rail on at least one of the upper work piece and the lower work piece. 14. The friction stir welding apparatus of claim 13 wherein the rail on each of the upper work piece and the lower work piece is a raised member. 15. The friction stir welding apparatus of claim 13 wherein the rail on each of the upper work piece and the lower work piece is a channel member. 16. The friction stir welding apparatus of claim 13 wherein the rail on each of the upper work piece and the lower work piece traces a path that is straight, curved or a combination of both. 17. The friction stir welding apparatus of claim 12 further comprising a drive structure coupled to at least one of the first member, the second member, and the third member, wherein the drive structure is adapted to urge along at least one of the upper work piece and the lower work piece as the friction stir welding tool is rotated to form a joint. 18. The friction stir welding apparatus of claim 12 wherein at least one of the upper engagement member, the middle engagement member, and the lower engagement member is spring loaded to urge at least one edge of at least one of the upper work piece and the lower work piece toward each other. 19. The friction stir welding apparatus of claim 1 wherein the first member and the second member each comprises two half sections which, when separated, allow the friction stir welding tool to be placed therein. 20. The friction stir welding apparatus of claim 1 wherein the friction stir welding tool is monolithic. 21. The friction stir welding apparatus of claim 5 wherein the friction stir welding tool is monolithic. 22. The friction stir welding apparatus of claim 12 wherein the friction stir welding tool is monolithic.
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