KR20110118437A - Welding quality determination apparatus and method - Google Patents

Welding quality determination apparatus and method Download PDF

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Publication number
KR20110118437A
KR20110118437A KR1020100038028A KR20100038028A KR20110118437A KR 20110118437 A KR20110118437 A KR 20110118437A KR 1020100038028 A KR1020100038028 A KR 1020100038028A KR 20100038028 A KR20100038028 A KR 20100038028A KR 20110118437 A KR20110118437 A KR 20110118437A
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South Korea
Prior art keywords
voltage
welding
current
waveform signal
welding quality
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KR1020100038028A
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Korean (ko)
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이창주
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이창주
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/095—Monitoring or automatic control of welding parameters
    • B23K9/0956—Monitoring or automatic control of welding parameters using sensing means, e.g. optical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
    • B23K31/125—Weld quality monitoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

The present invention relates to a welding quality determination device and method for analyzing the waveform of the voltage and current output from the welding machine to compare with the waveform at the normal quality to determine the quality of the welding.
The welding quality judging apparatus of the present invention includes a voltage detector which detects a voltage output from a welding machine driven by a commercial power supply, a current detector that detects a current output from the welder, and a voltage detected by the voltage detector. The voltage is converted into a driving voltage required for driving the quality judgment device, and the current is driven by using the current and voltage during welding detected by the current detector and the voltage detector, respectively, driven by the driving voltage converted by the voltage converter. And a signal processing unit for outputting a current waveform signal and a voltage waveform signal corresponding to the voltage, respectively, and a determination unit determining the welding quality by comparing the current waveform signal and the voltage waveform signal with a pre-stored waveform signal.

Figure P1020100038028

Description

Welding Quality Determination Apparatus and Method {WELDING QUALITY DETERMINATION APPARATUS AND METHOD}

The present invention relates to an apparatus and method for determining weld quality, and more particularly, to an apparatus and method for determining weld quality by analyzing waveforms of voltage and current output from a welder and comparing them with waveforms in normal quality. will be.

Welding is the joining of metals of the same or different types by applying heat and pressure to form a direct bond between solids. In general, such welding uses a method of applying a current through a welder to heat and melt the material to bond by rearranging the atomic bonds of the two materials. This is typical of arc welding, for example.

Recently, new welding technologies have been developed, such as the electroslag method, which is a welding method using resistance heating of slag used for welding a very thick plate, and the electron-beam method, which allows welding of a material having high melting point. . In addition, there are ultrasonic welding for applying ultrasonic vibration, and laser welding for precise welding and cutting.

Since the quality of the product is determined by the quality of the welding, it is important to manage the welding quality. In the prior art, a technique for diagnosing welding quality by detecting a voltage between electrodes, and a technique for determining a welding state using a surface temperature of a weld, a thickness of the weld, and the like have been proposed.

However, this conventional welding quality determination method simply determines that the welding state is abnormal when the inter-electrode voltage is out of the allowable range, so there is a problem of determining without accurate interpretation of the actual welding melting phenomenon, the surface temperature, thickness, etc. of the weld. In this method, since a variable is generated by external factors such as seasonal factors and mechanical misalignment of the welded part, it is difficult to accurately determine weld quality. In particular, in order to drive such a conventional welding quality determination device there is a problem in that it is inconvenient to supply power in the welding environment because 220V commercial power is separately required.

In addition, in the related art, a method of photographing a welding part with a camera and checking the same with a monitor device has been proposed in order to determine the welding quality, but this also has the inconvenience of supplying a separate commercial power, and visual quality through the monitor device. There is a problem in that it is difficult to make an accurate judgment.

Therefore, there has been a demand for a technology capable of accurately determining welding quality while being able to operate simply by using a power output from a welding machine without requiring a separate commercial power source.

The present invention has been proposed to solve the above problems of the prior art, and provides a welding quality determination apparatus and method which can determine the quality of welding using a voltage output from the welding machine as a driving voltage without a separate external power source. The purpose is.

In addition, the present invention provides a welding quality determination device and method that can detect the voltage and current output from the welder when welding in the welder and determine the weld quality by using the waveform signal for the voltage and current. There is this.

The present invention for achieving the above object,

An apparatus for determining welding quality in a welding machine driven by a commercial power source, the apparatus comprising: a voltage detector detecting a voltage output from the welding machine; A current detector for detecting a current output from the welder; A voltage converting unit converting the driving voltage necessary for driving the welding quality determining apparatus using the voltage detected by the voltage detecting unit; The current waveform signal and the voltage waveform signal corresponding to the current and the voltage are respectively output using the current and voltage at the time of welding, which are driven by the driving voltage converted by the voltage converting unit and detected by the current detector and the voltage detector, respectively. A signal processor; And a determination unit which compares the current waveform signal and the voltage waveform signal with a waveform signal according to the pre-stored welding to determine a welding quality.

In an embodiment of the present disclosure, the display device may further include a display unit configured to display the output voltage waveform signal and the current waveform signal.

In an embodiment of the present invention, the voltage detected by the voltage detector is a DC voltage of 16 ~ 52V, the converted drive voltage is preferably a DC voltage of 12 ~ 15V.

In addition, the present invention for achieving the above object,

A welding quality determination method using a welding quality determination device that receives a driving voltage from a welding machine using a commercial power source, the welding quality determination method comprising: detecting a voltage and a current output from the welding machine when welding using the welding machine is started; Converting the detected voltage into a driving voltage necessary for driving the welding quality determining device; Outputting a current waveform signal and a voltage waveform signal using the detected current and voltage at the time of welding; And determining the welding quality by comparing the current waveform signal and the voltage waveform signal with a waveform signal according to the pre-stored welding.

In an embodiment of the present invention, the driving voltage is preferably 12 ~ 15V.

According to the present invention, the welding quality judging device can be driven using the voltage output from the welding machine without supplying external power.

In addition, according to the present invention, since welding quality is determined using waveform signals of voltage and current output from the welding machine when welding in a welding machine, welding quality can be easily and simply determined, and compared with the pre-stored normal / abnormal welding waveform signal. By this, accurate welding quality determination can be made.

1 is a block diagram of a welding quality determination apparatus according to an embodiment of the present invention.
2 is a graph illustrating an experimental example of a voltage and a voltage waveform signal according to welding quality according to the present invention.
3 is a flowchart showing a welding quality determination method according to the present invention.

Hereinafter, with reference to the drawings showing a preferred embodiment of the present invention will be described in detail the present invention. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of a welding quality determination apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the welding quality determining apparatus 100 according to the present invention includes a voltage detector 110, a current detector 120, a voltage converter 130, a signal processor 140, and a storage 150. And a determination unit 160. In addition, the welding quality determining apparatus 100 may further include a display unit 170.

Basically, the welding quality determining apparatus 100 of the present invention uses the voltage and current output from the welding machine 10. In particular, the voltage and current output when the metal material 30 is welded using the welder 10 are used. At this time, the welding machine 10 is driven using the external power source 20, for example, is driven using a commercial power source of 220V.

The voltage detector 110 and the current detector 120 detect voltages and currents output from the welder 10, respectively. For example, in the case of welding using an arc welder, a DC voltage of 16 to 45 V is output from the welder, and a current is generated when the probe of the welder 10 contacts the metal material 30 to be welded. It flows, and a DC current of about 80 ~ 500A is output. For example, the current detector 120 may use a DC current transformer.

The voltage converting unit 130 converts the driving voltage necessary for driving the welding quality determining apparatus 100 of the present invention by using the voltage detected by the voltage detecting unit 110 as described above. For example, in the case of an arc welder, a DC quality of 16 to 52V is converted into a DC voltage of 12 to 15V, and the welding quality determining apparatus 100 is driven using the converted DC voltage of 12 to 15V. As described above, the present invention is characterized in that it is used as a driving voltage by converting it into a voltage required for driving by using a voltage output from the welder 10 without receiving an external power source (for example, a commercial power source).

The signal processor 140 operates using the driving voltage converted by the voltage converter 130 and corresponds to the voltage and current using the voltage and current detected by the voltage detector 110 and the current detector 120, respectively. A voltage waveform signal and a current waveform signal are generated and output. These voltage waveform signals and current waveform signals are unique signals that include the characteristics of the detected voltage and current. For example, when the detected current maintains a constant value and suddenly bounces large, a current waveform signal is also generated correspondingly. Such voltage waveform signals and current waveform signals may be represented in a time domain or a frequency domain.

The storage unit 150 stores a plurality of current waveform signals and voltage waveform signals according to welding quality in advance. In particular, the storage unit 150 stores the current waveform signal and the voltage waveform signal corresponding to normal welding quality and abnormal welding quality, respectively. These are waveform signals that serve as criteria for determining welding quality. More specifically, it is preferable to store the current waveform signal and the voltage waveform signal according to each of the plurality of stages for welding quality.

The determination unit 160 compares the current waveform signal and the voltage waveform signal output from the signal processor 140 with the prestored current waveform signal and the voltage waveform signal to determine the welding quality. In this case, the welding quality may be determined as normal or abnormal according to an embodiment, or may be determined by dividing each step.

The display unit 170 visually displays the current waveform signal and the voltage waveform signal output from the signal processor 140. This allows the user to check the current waveform and the voltage waveform signal according to the welding while performing the welding.

2 is a graph showing the experimental results of the current waveform signal and the voltage waveform signal according to the welding quality according to the present invention.

In the experimental example of FIG. 2, it is the result at the time of welding using an arc welder. (A) of FIG. 2 shows a current waveform signal and a voltage waveform signal when normal welding is performed in an arc welding machine, and (b) and (c) of FIG. 2 show a current waveform signal when abnormal welding is performed and The voltage waveform signal is shown.

First, referring to FIG. 2A, when the welding is normally performed and the welded portion A is well represented, the current waveform signal Ia and the voltage waveform signal Va appear as regular waveforms. have. However, in FIG. 2B, when the welding is abnormally performed and a bad portion B is generated unlike the well welded portion A, the current waveform signal Ib and the voltage waveform signal Vb are the same. It can be seen that the irregular waveform appears at the time corresponding to the bad portion (B). In addition, in FIG. 2C, it can be seen that an irregular waveform appears at a time corresponding to the poor welding part C. FIG.

Table 1 shows data showing the results of the above experimental example.

Output voltage of arc welding machine Output current of arc welding machine Welding quality judgment 18-25V 108 ~ 384A Good 20 ~ 38V 165 ~ 435 A Good 29 ~ 63V 380 ~ 672 A Bad 38 ~ 59V 412 ~ 648A Bad 5 ~ 27V 35 ~ 172A Bad 12 ~ 39V 55-457 A Bad

As can be seen from [Table 1], when the output voltage and the output current of the welding machine is within a certain range, the welding quality was determined to be good, and when it was out of the range, the welding quality was determined to be poor.

As a result of the experimental example, it can be seen that the waveform signal of the current and voltage output from the welder 10 is directly related to the quality of the welding. This means that the welding quality is good when the current and voltage are constantly output from the welder, and the welding quality is poor when the current and voltage are irregularly output from the welder. In the present invention, such a relationship is used to determine the welding quality from the characteristics of the current and voltage drawn from the welder.

3 is a flowchart showing a welding quality determination method according to the present invention.

Referring to FIG. 3, the welding quality determining method according to the present invention is preferably implemented according to the operation of the welding quality determining apparatus 100 described with reference to FIG. 1.

First, an external power source (for example, a commercial power source) is applied to the welder 10 (S101), and when welding using the welder 10 is started (S102), the voltage and current output from the welder 10 are respectively detected ( S103).

Using the voltage detected in this way, the welding quality determination device 100 is converted into a driving voltage necessary for driving the device (S104). As a result, the welding quality determining apparatus 100 uses the voltage output from the welding machine 10 as a driving voltage instead of an external power source.

Subsequently, using the voltage and current detected as described above, a voltage waveform signal and a current waveform signal corresponding to the voltage and current are respectively generated and output (S105). Subsequently, among the plurality of voltage waveform signals and current waveform signals according to the previously stored welding quality, the corresponding ones of the voltage waveform signals and the current waveform signals generated as described above are searched and compared (S106). The welding quality is determined according to the comparison result (S107).

Meanwhile, although not shown in the drawing, the welding quality determination method according to the present invention may visually display the generated voltage waveform signal and current waveform signal through a display device.

As described above, in the welding quality determining apparatus and method of the present invention, the welding quality is determined using the characteristics of the voltage and current output from the welding machine, rather than the quality determination of the welded position. This is possible by demonstrating through the experimental example of the present invention that the welding quality is determined by the characteristics of the voltage and current output from the welder. To this end, the current waveform and the voltage waveform according to the welding quality are obtained in advance, and then the welding quality is determined by comparing the current waveform and the voltage waveform corresponding to the current and voltage detected during the actual welding with the stored data.

Accordingly, in the present invention, the welding quality determination device is driven by using the voltage output from the welding machine without applying an external power source such as a commercial power supply, and the welding quality is determined using the characteristics of the current and voltage output from the welding machine. To have.

Although the present invention described above has been described in detail through the preferred embodiments, it should be understood that the present invention is not limited to the contents of these embodiments. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope of the appended claims, The genius will be so self-evident. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: welding machine 20: external power
30: metal material 110: voltage detector
120: current detector 130: voltage converter
140: signal processing unit 150: storage unit
160: determination unit 170: display unit

Claims (5)

In the welding quality judging device in a welding machine driven by a commercial power source,
A voltage detector detecting a voltage output from the welder;
A current detector for detecting a current output from the welder;
A voltage converting unit converting the driving voltage necessary for driving the welding quality determining apparatus using the voltage detected by the voltage detecting unit;
The current waveform signal and the voltage waveform signal corresponding to the current and the voltage are respectively output using the current and voltage at the time of welding, which are driven by the driving voltage converted by the voltage converting unit and detected by the current detector and the voltage detector, respectively. A signal processor; And
Determination unit for determining the welding quality by comparing the current waveform signal and the voltage waveform signal with the waveform signal according to the pre-stored welding;
Welding quality judging device comprising a. The method of claim 1,
And a display unit which displays the output voltage waveform signal and current waveform signal. The method of claim 1,
Welding voltage determination device, characterized in that the voltage detected by the voltage detector is a DC voltage of 16 ~ 52V, the converted drive voltage is a DC voltage of 12 ~ 15V. In the welding quality determination method using a welding quality determination device for driving the driving voltage supplied from the welding machine using a commercial power source,
Detecting a voltage and a current output from the welder when welding using the welder is started;
Converting the detected voltage into a driving voltage necessary for driving the welding quality determining device;
Outputting a current waveform signal and a voltage waveform signal using the detected current and voltage at the time of welding; And
Determining a welding quality by comparing the current waveform signal and the voltage waveform signal with a waveform signal according to previously stored welding;
Welding quality determination method comprising a. The method of claim 4, wherein
Weld quality determination method, characterized in that the drive voltage is 12 ~ 15V.
KR1020100038028A 2010-04-23 2010-04-23 Welding quality determination apparatus and method KR20110118437A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114414631A (en) * 2021-12-22 2022-04-29 重庆大学 Welding layer sintering quality nondestructive evaluation method based on electric pulse signal time-frequency domain analysis
KR20230040581A (en) 2021-09-16 2023-03-23 주식회사 엘지에너지솔루션 Ultrasonic welding quality monitoring system and method using artificial intelligence

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230040581A (en) 2021-09-16 2023-03-23 주식회사 엘지에너지솔루션 Ultrasonic welding quality monitoring system and method using artificial intelligence
CN114414631A (en) * 2021-12-22 2022-04-29 重庆大学 Welding layer sintering quality nondestructive evaluation method based on electric pulse signal time-frequency domain analysis

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