JPS6257785A - Flash butt welding method - Google Patents

Abstract

PURPOSE:To make upset starting time suitable, by operating not only heat input energy to an object to be welded but also the difference between the heat input energy and the previously set most suitable heat input energy and outputting an upset command at the moment when the difference becomes zero. CONSTITUTION:An electric power detector 3 is provided to a welding power source 1 and, at the same time, a displacement gauge 8 and flashing quantity detector 7 are provided against an object 2 to be welded. A divider 5 operates the electric power per unit welding area Q1 of the object 2 and a multiplier 10 calculates the energy Q2 carried away by scattered particles. In this case, heat input energy Q3 is obtained from the difference between the energy Q2 and electric power Q1. At the moment when the set heat input energy Q4 of a setter 13 becomes equal to the heat input energy Q3, an upset command is caused to be outputted. Therefore, the upset starting time can always be made most suitable even when welding conditions are changed.

Description

[Detailed description of the invention] [Technical field of invention] The invention relates to a flash welding method.

[Prior art and its problems]

Conventionally, for upset in flash welding, as shown in Figure 2, the flash amount or flash time is measured, and this measurement result is compared with a preset target value, and when this comparison value becomes zero, It had started.

However, since the start time of upsetting changes depending on welding conditions such as the welding area of the workpiece, it is necessary to find an appropriate value and reset to this appropriate value each time the welding conditions change.

Therefore, there is a desire to develop a flash welding method that allows upset to be started at an appropriate time even if welding conditions change, but such a method has not yet been proposed.

[Purpose of the invention]

Therefore, an object of the present invention is to provide a shoe welding method that allows upset to be started at an appropriate time even if welding conditions change.

[Summary of the invention]

This invention detects the power consumed when flash welding the workpiece, integrates the detected power, and determines the unit of the workpiece based on the integrated power and the welding area of the workpiece. Calculate the power consumption per area (Q,),
The energy (Q2) carried away by the particles scattered by the flash is calculated based on the flash amount of the object to be welded and the preset energy per unit volume of the particles scattered by the flash, and the energy (Q2) is calculated by calculating the power consumption (Q1) and the energy. (Q2), the heat input energy (Q3) to the workpiece is calculated, and the heat input energy (Q
) and the preset optimal heat input energy (Q4) for starting upsetting, and when the value of the difference becomes zero, an upsetting command is issued, thus making the workpiece to be welded optimally. The feature is that flash welding is carried out in a stable condition.

[Structure of the invention]

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In FIG. 1, a welding power source 1 applies a voltage to a workpiece 2 to be flash-welded. The power detector 3 detects the power (KW) consumed on the primary side of the welding power source 1. The integrating power meter 4 integrates the power detected by the power detector 3. The area setter 5 presets the welding area of the workpiece 2 in a divider 6, which will be described later. The divider 6 calculates the electric power (Q, KW -5eCy/
-) is calculated.

The flash amount detector 7 detects the flash amount (U) of the workpiece 2 based on the amount of movement of the workpiece 2 from a displacement meter 8 attached to the workpiece 2 .

The scattered particle energy setting device 9 calculates the energy per unit volume (KW/
, 3) are set in advance in a multiplier to be described later.

The multiplier 10 calculates the energy carried away by the particles scattered by the flash (Ql) based on the flash amount detected by the flash amount detector 7 and the energy per unit volume of the scattered particles set by the scattered particle energy setting device 9. xw/I!j).

The subtracter 11 calculates the electric power (Q1) consumed per unit welding area of the workpiece 2 calculated by the divider 6 and the amount of particles scattered by the flash carried away, calculated by the adder 10. By calculating the difference (Q, ) from the energy (Q2), the heat input energy (Q4) of the workpiece 2 is calculated. The comparator 12 calculates the difference (Q, −Q,
), and when the difference (Q3-Q4) becomes zero, an upset command is issued.

In one embodiment of the present invention configured as described above, the power consumption on the primary side of the welding power source 1 is detected by the power detector 3. The power detected in this way is integrated by the integrated power meter 4. The integrated power is
The divider 6 converts the power (Q,) per unit welding area of the workpiece 2 to be welded.

At the same time, the amount of flash, that is, the amount of movement of the object to be welded 2 is detected by the amount of flash detector 7. The amount of flash is converted by the multiplier 10 into the energy (Q2) carried away by the particles scattered by the flash.

The difference (Q3) between the power (q,) and the energy (Q,) calculated in this way is calculated by the subtracter 11. The difference (Q,) is compared with a preset optimal heat input energy (Q4) by a comparator 12,
When this difference becomes zero, that is, when the difference (Q,) becomes equal to the optimum heat input energy (Q4), an upset command is issued. As a result, the workpiece 2 is flash-welded in an optimal state.

〔Effect of the invention〕

As explained above, according to the present invention, an extremely useful effect is brought about in that upset can always be started at an appropriate time even if welding conditions change.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the flash amount of the workpiece and time. In the drawings, 1... welding power source,
2... Workpiece to be welded, 3... Power detector, 4
... Integrating power meter, 5... Area setting device, 6.
... Divider, 7... Flash amount detector, 8... Displacement meter, 9... Scattered particle energy setting device, 10... Multiplier, 11... Subtractor, 12
...Comparator, 13...Heat input energy setting device.

Claims (1)

[Claims] Detect the power consumed when flash welding the workpiece, integrate the detected power, and calculate the amount of power per unit area of the workpiece based on the integrated power and the welding area of the workpiece. Calculate the power consumption (Q_1) of the workpiece, and calculate the energy carried away by the particles scattered by the flash ( Q
Based on the power consumption (Q_1) and the energy (Q_2), the heat input energy (Q_3) to the workpiece is calculated, and the heat input energy (Q_2) is calculated.
A flash welding method characterized by calculating the difference between 3) and a preset optimal heat input energy (Q_4) for starting upset, and issuing an upset command when the value of the difference becomes zero.