Welding fixture apparatus

1. A welding fixture apparatus, comprising:

a base having a plurality of legs arranged in a generally upright orientation and extending from a lower end to an upper end;

a support member attached to upper ends of the legs and extending generally vertically upward from the upper ends of the legs, the support member having an opening in an upper end;

a head configured for engaging a workpiece, the head attached to a head plate, and a head shaft attached to and extending axially from the head plate and away from the head;

a head mount configured to axially receive and rotatably hold the head shaft, the head mount attached to an upper end of a head mount shaft, a lower end of the head mount shaft received in the support member through the opening in the upper end of the support member, the position of the head mount shaft being axially adjustable and fixable relative to the support member, and a pivot located between the head shaft and the support member and connected to the head mount shaft;

a pivot adjustment that comprises a double ended screw, an upper threaded shaft engaged with a first end of the double ended screw and a lower threaded shaft engaged with a second end of the double ended screw; wherein the upper threaded shaft is coupled with the head mount shaft and the lower threaded shaft is coupled with the support member.

2. The welding fixture apparatus of claim 1 wherein the base comprise three legs in a tripod configuration.

3. The welding fixture apparatus of claim 1 further comprising a locking mechanism in connection with the support member, the locking mechanism operative to lock the head mount shaft in an axially aligned position relative to the support member.

4. The welding fixture apparatus of claim 1 further comprising a head shaft column having a first end received in the support member and a second end extending from the support member, and the head mount shaft received in the second end of the head shaft column.

5. The welding fixture apparatus of claim 4 further comprising a locking mechanism in connection with the head shaft column and operative to lock the head mount shaft in position relative to the head shaft column.

6. The welding fixture apparatus of claim 1 wherein the pivot is located at a distal end of the head shaft.

7. The welding fixture apparatus of claim 1 further comprising a locking mechanism in connection with the head mount operative to lock the head shaft relative to the head mount.

8. The welding fixture apparatus of claim 1 wherein the pivot adjustment comprises a first pivot located proximate to the support member and a second pivot located proximate to the head mount.

9. The welding fixture apparatus of claim 1 wherein the head mount shaft further comprises an axially aligned slot.

10. The welding fixture apparatus of claim 1 wherein the head mount shaft further comprises a boss which bears against an interior surface of the head shaft column.

11. The welding fixture apparatus of claim 1 further comprising a fine adjustment thread-engaged with the head mount shaft.

12. The welding fixture apparatus of claim 4 further comprising a flange at the second end of the head shaft column and collar on the flange.

13. The welding fixture apparatus of claim 12 further comprising a needle bearing ring located between the flange and the collar on the flange.

14. The welding fixture apparatus of claim 12 further comprising a retaining ring between the collar and the flange.

15. A welding fixture apparatus comprising:

a base;

a head configured for attachment to a workpiece, the head having a plurality of adjustable jaws mounted in a head body, the head body attached to a head shaft mounted for rotation in a head mount;

a rotational shaft coupled with the head;

the head mount attached to a pivot supported by a shaft which is supported by the base,

a pivot adjustment that comprises a doubled ended screw engaged with a threaded shaft to change a position of the head about the pivot; and

a head shaft rotation lock that comprises a screw which extends through the head mount and contacts to bear against a compression ring which encircles the head rotational shaft.

16. The welding fixture apparatus of claim 15 further comprising a head shaft column attached to the base, and a pivot adjustment which extends from the head mount to the head shaft column.

17. The welding fixture apparatus of claim 15 wherein the pivot is supported by a head mount shaft which is supported by the base.

18. The welding fixture apparatus of claim 17 wherein the head mount shaft is connected to a head shaft column which is supported by the base.

19. The welding fixture apparatus of claim 18 wherein the head mount shaft is connected to the head shaft column by an adjustable threaded connection.

20. The welding fixture apparatus of claim 18 wherein the pivot adjustment extends from the head mount to the head shaft column.

21. The welding fixture apparatus of claim 17 further comprising a lock operative to fix a position of the head mount shaft.

22. The welding fixture apparatus of claim 15 further comprising a second head shaft rotation lock, the second shaft rotation lock having a split collar configuration that comprises halves that engage the rotational shaft with a threaded compression screw to adjust the grip of the halves upon rotational shaft.