Browse Prior Art Database

Fine Positioning of Series Welding Heads

IP.com Disclosure Number: IPCOM000052027D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Chladek, TG: AUTHOR [+2]

Abstract

Series-welding heads on a common mechanical carrier are individually fine-positioned by independent control of electromagnets operating with permanent magnets in the heads.

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Fine Positioning of Series Welding Heads

Series-welding heads on a common mechanical carrier are individually fine- positioned by independent control of electromagnets operating with permanent magnets in the heads.

Metal sheet or bar workpieces 10, 11 are joined together by passing a welding current between electrodes 12, 13 carried on identical welding heads 14,
15. Both heads are rigidly attached to a common mechanical carrier 16 for gross position control in a conventional manner. To achieve fine control of position and pressure, electrodes 12 and 13 are individually movable over a small vertical range.

In the partially cutaway view of head 15, bearings 17 support shaft 18 in housing 19. Permanent magnet 20 repels shaft-mounted magnet 21 for cushioning before electrode 13 comes into contact with workpiece 10. As housing 19 continues to move downward, the repulsion between magnet 21 and another permanent magnet 22 applies pressure to electrode 13. At this point, a control current may be passed through electromagnet coil 23, wound in core 24, to attract shaft-mounted armature 25 and apply further pressure to electrode 13. Electrode 12 may be similarly controlled by a second control circuit for attracting armature 26. Since the two control currents may be separately regulated, independent fine positioning and pressures may be achieved for electrodes 12, 13 even though the heads 14, 15 are mechanically fixed to each other.

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