Flash butt welding device

Details Flash butt welding device Flash butt welding device

2000-03-20

2001-07-17

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

For bonding with pressure

Reexamination Certificate

active

06262385

ABSTRACT:

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 an 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
43
a
,
44
a
, and
43
b
,
44
b
, to clamp a preceding billet
10
a
and a succeeding billet
10
b
, respectively. Of these hydraulic cylinders, the clamp bodies of the cylinder
43
a
and of the cylinder
43
b
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 Volts and 100 thousand Amperes) 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 cause a high impedance. The high impedance results in 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.
SUMMARY 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.
A first flash-butt welder according to the present invention comprises: at least two power source transformers located at the stationary head side and; at least two conductors arranged symmetrically with respect to a central line of works to be welded and connecting the power transformers with electrodes; wherein the number of the conductors which are connected to the electrodes at the moving head side is half the total number of conductors.
A 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.


REFERENCES:
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patent: 2974217 (1961-03-01), Crawford
patent: 4686346 (1987-08-01), Kuchuk-Yatsenko et al.
patent: 4725707 (1988-02-01), Kuchuk-Yatsenko et al.
patent: 4733044 (1988-03-01), Kuckuk-Yatsenko et al.
patent: 4940876 (1990-07-01), Kuchuk-Yatsenko et al.
patent: 5117084 (1992-05-01), Kuchuk-Yatsenko et al.
patent: 5389760 (1995-02-01), Zollinger
patent: 6107594 (2000-08-01), Matsuo et al.
patent: 56-126987 (1981-09-01), None
patent: 9-94671 (1997-04-01), None

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