Electric heating – Metal heating – By arc
Reexamination Certificate
2000-05-25
2002-05-07
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
Reexamination Certificate
active
06384375
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an arc welding power supply for performing arc welding, a peripheral device for arc welding, and an arc welding apparatus.
BACKGROUND OF THE INVENTION
The arc welding apparatus is recently designed to perform welding by means of a robot controller for arc welding and an arc welding power supply.
A welding current command value and a welding voltage command value, or a welding current command value and an adjusting voltage command value are set in this robot controller for arc welding. These set command values are given to the arc welding power supply. The arc welding power supply determines the welding output according to the entered command values. The welding apparatus welds according to the determined welding output.
There are two types of command type of welding voltage to the arc welding power supply:
Independent commanding of the welding current and welding voltage (hereinafter called welding voltage command type); and
Commanding by correcting the welding current and the voltage interlocked with the current (hereinafter called adjusting voltage command type).
For example, when welding at welding current of 120 A and welding voltage of 19.0 V (appropriate voltage also being 19.0 V), the welding operator sets the following data in the robot controller for arc welding:
In the case of welding voltage command type, current command value=120, voltage command value 19.0; and
In the case of adjusting voltage command type, current command value=120 A, adjusting voltage command value=0.0.
Herein, the adjusting voltage command value (0.0 in this case) in the adjusting voltage command type is the difference between the welding voltage (19.0 V in this case) and the appropriate voltage (19.0 V in this case).
In the recent arc welding apparatus, such voltage command types can be changed over and used. In this case, the voltage command value is, when the voltage command type is changed over, automatically converted to the voltage command value of the selected voltage command type (welding voltage command type or adjusting voltage command type).
A conventional arc welding power supply is explained below by referring to the drawing.
FIG. 4
is a block diagram showing a constitution of welding system by an arc welding power supply and arc welding robot in a prior art. As shown in the block diagram in
FIG. 4
, the conventional welding system is composed of a robot controller for arc welding
101
A and an arc welding power supply
110
.
The robot controller for arc welding
101
A comprises:
a) a welding current setting unit (hereinafter referred to simply as “WC setting unit”)
2
,
b) a welding voltage setting unit (hereinafter referred to simply as “WV setting unit”)
3
,
c) an adjusting voltage setting unit (hereinafter referred to simply as “AV setting unit”)
4
,
d) a welding voltage selector (hereinafter referred to simply as “WV selector”)
5
,
e) a voltage command value calculator (hereinafter referred to simply as “VCV calculator”)
6
,
f) a current command value output unit (hereinafter referred to simply as “CCV output unit”)
7
,
g) a voltage command value output unit (hereinafter referred to simply as “VCV output unit”)
8
, and
h) a voltage command type setting unit (hereinafter referred to simply as “VCT setting unit”)
9
.
The arc welding power supply
110
comprises:
a) a current command value input unit (hereinafter referred to simply as “CCV input unit”)
11
,
b) a voltage command value input unit (hereinafter referred to simply as “VCV input unit”)
12
,
c) a welding voltage selector (hereinafter referred to simply as “WV selector”)
13
,
d) a voltage command value calculator (hereinafter referred to simply as “VCV calculator”)
14
,
e) a welding output controller (hereinafter referred to simply as “WO controller”)
22
,
f) an inverter
23
, and
g) output terminals
25
,
26
.
The inverter
23
is connected to a three-phase alternating-current power source
24
.
The welding voltage selectors
5
and
13
are individually composed of a memory (not shown) and a selection output unit (not shown).
The memory stores a data table of each current determined individually for the welding method, electrode diameter, and welding material (hereinafter the data table stored in the memory is called the stored data).
The selection output unit selects and outputs an appropriate welding voltage from the stored data table depending on the set value of current.
The operation of this constitution is explained below.
First, in the robot controller for arc welding
101
A, suppose the VCT setting unit
9
is set in the welding voltage command type. In this case, the welding operator:
Sets the VCT setting unit
9
in the welding voltage command type,
Sets the welding current in the current setting unit
2
, and
Sets the welding voltage in the WV setting unit
3
.
The current setting unit
2
outputs the set specified welding current, and the WV setting unit
3
outputs the set specified welding voltage.
At this time, the WV selector
5
selects and outputs an appropriate welding voltage (hereinafter called selected voltage) depending on the welding current set in the current setting unit
2
. The VCV calculator
6
calculates the adjusting voltage by subtraction of the selected voltage outputted from the WV selector
5
and the welding voltage set in the WV setting unit
3
. The VCV calculator
6
sends this adjusting voltage to the AV setting unit
4
. The AV setting unit
4
stores this adjusting voltage in the memory (not shown).
When the VCT setting unit
9
is changed to the adjusting voltage command type, the AV setting unit
4
outputs the adjusting voltage stored in the memory unit.
Next, in the robot controller for arc welding
101
A, suppose the VCT setting unit
9
is set in the adjusting voltage command type. In this case, the welding operator:
Sets the VCT setting unit
9
in the adjusting voltage command type,
Sets the welding current in the current setting unit
2
, and
Sets the adjusting voltage in the AV setting unit
4
.
The current setting unit
2
outputs the set specified welding current, and the AV setting unit
4
outputs the set specified adjusting voltage.
At this time, the WV selector
5
selects and outputs a selected voltage depending on the welding current set in the current setting unit
2
. The VCV calculator
6
calculates the welding voltage by addition of the selected voltage outputted from the WV selector
5
and the adjusting voltage set in the AV setting unit
4
. The VCV calculator
6
sends this welding voltage to the WV setting unit
3
. The WV setting unit
3
stores this welding voltage in the memory (not shown).
When the VCT setting unit
9
is changed to the welding voltage command type, the WV setting unit
3
outputs the welding voltage stored in the memory unit.
Thus, the welding current, and the welding voltage or adjusting voltage are set. Consequently, the CCV output unit
7
receives the output signal from the current setting unit
2
, and outputs a signal depending on the set current command value. Further, the VCV output unit
8
, when the VCT setting unit
9
is set in the welding voltage command type, outputs a signal depending on the voltage command value set in the WV setting unit
3
. When set in the adjusting voltage command type, the VCV output unit
8
outputs a signal depending on the adjusting voltage set in the AV setting unit
4
.
On the other hand, in the arc welding power supply
110
, when the VCT setting unit
9
is set in the welding voltage command type, the CCV input unit
11
receives the output signal from the CCV output unit
7
, and outputs a current set value. The VCV input unit
12
receives the output signal from the VCV output unit
8
, and outputs a voltage set value.
Or, in the arc welding power supply
110
, when the VCT setting unit
9
is set in the adjusting voltage command type, the CCV input unit
11
receives the output signal from the CCV output unit
7
, and outputs a current set value. The VCV input unit
12
receives the output
Hongu Toshinori
Tsuchiya Yasuzo
Ratner & Prestia
Shaw Clifford C.
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