Electric heating – Metal heating – For bonding with pressure
Patent
1998-12-04
2000-08-22
Ryan, Patrick
Electric heating
Metal heating
For bonding with pressure
219100, B23K 900
Patent
active
061075949
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a flash-butt welder, and particularly to an arrangement of the power source transformers and the conductors thereof.
BACKGROUND ART
FIG. 11 shows outline of a flash-butt welder. The flash-butt welder is provided with a stationary head 41 and a moving head 42. Each of the heads has hydraulic cylinders 43a, 44a, and 43b, 44b, to clamp a preceding billet 10a and a succeeding billet 10b, respectively. Of these hydraulic cylinders, the clamp bodies of the cylinder 43a and of the cylinder 43b which are near to an edge 11 of the billets form electrodes 45, 46, respectively. The moving head 42 is movable, and the movement thereof is controlled by a plurality of upset hydraulic cylinders (not shown).
FIG. 12 illustrates the arrangement of the power source transformers and the conductors (bus bars) in the flash-butt welder shown in FIG. 11. The stationary head 41 is equipped with two power source transformers 12, 13, and the moving head 42 is also equipped with two power source transformers 14, 15. Each of the four bus bars, 16 through 19, connects a transformer of the stationary head 41 side with the corresponding transformer of the moving head 42 side.
A flash-butt welder for welding billets or the like uses a power source with low voltage and large current (for example, 10 Volt and 100 thousand Ampere) owing to the inherent characteristics of the welder. Consequently, the welder requires at least four transformers, 12 through 15, and furthermore, each two power source transformers are provided to each of the stationary head 41 side and the moving head 42 side, as shown in FIG. 12. As a result, the necessary number of bus bars connecting the stationary head 41 side with the moving head 42 side is at least four. This requirement makes the structure of the welder complex, and these bus bars causes a high impedance. The high impedance makes a low efficiency. Since the welder is driven under a condition of low voltage and large current, the effect of the high impedance is extremely significant.
DISCLOSURE OF INVENTION
The present invention aims to solve the above-described problems, and an object of the present invention is to provide a flash-butt welder that decreases the number of bus bars connecting the stationary head side with the moving head side and that decreases the impedance of these bus bars. The present invention as a preferred mode is following.
The first flash-butt welder comprising: at least two power source transformer located at the stationary head side; at least two conductors arranged symmetrically to a central line of works to be welded and connecting the power transformers with electrodes; while half of the number of the conductors are connected to the electrodes at the moving head side.
The second flash-butt welder is one that the conductors are arranged to minimize an area surrounded by the conductors and the works to be welded in the first welder.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a flash-butt welder of a mode to carry out the present invention.
FIG. 2 illustrates the area surrounded by electrodes and a conductor in FIG. 1.
FIG. 3 shows a perspective view of an experimental model for power application to validate the usefulness of a mode to carry out the present invention, (for the case of the number of circuits=1).
FIG. 4 shows a perspective view of an experimental model for power application to validate the usefulness of a mode to carry out the present invention, (for the case of the number of circuits=2).
FIG. 5 shows a perspective view of an experimental model for power application to validate the usefulness of a mode to carry out the present invention, (for the case of the number of circuits=4).
FIG. 6 shows characteristic curves in relation to the conductor arrangement and the reactance in the experimental models of FIG. 3 and FIG. 4, (1=100 mm).
FIG. 7 shows characteristic curves in relation to the conductor arrangement and the reactance in the experimental models of FIGS. 3, 4 and 5, (1=200 mm).
FIG. 8 shows c
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Fujii Hiroshi
Matsuo Giichi
Okawa Susumu
Dey Anjan
NKK Corporation
Ryan Patrick
LandOfFree
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