JPH1177311A - Method for controlling heat input integration and indentation in stud welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the control method for starting indentation by integrating heat input during the pulling-up period in stud welding by which an adequate heat input can be secured even if a short-circuit is caused and a satisfactory welding quality can be obtained. SOLUTION: Before the start of welding, a standard heat input Qst 38 is preset for the entire main arc period at the time of normal welding; at the point of time t2 for starting main arc current energization, with an auxiliary arc current Ip switched to the main arc current Ia, an average value of heat input ΔQav for each detecting interval is integrated, which is the product of an arc voltage average value Vav(Δt), measured at each detecting interval Δt from the point of time t3 for starting the detection of the main arc current/ voltage, and the main arc current average value Iav(Δt) at each detecting interval, so that the integrated heat input Qta3n for the main arc period is determined. Then, an indentation process is started at the time tn when the heat input value so determined reaches the preset standard heat input Qst38 of the entire main arc period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for accumulating heat input during a stud welding pull-up period and starting pushing.

[0002]

2. Description of the Related Art In stud welding, a stud is pulled up from a material to be welded, and then the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding. It is important to obtain the required heat input (hereinafter, required heat input) Qr. If the welding conditions such as heat input are not appropriate and the required heat input Qr cannot be obtained, for example, if the welding current value is lower than the appropriate value, if the pulling distance is short, or if the welding posture is poor During the lifting period, the molten surface of the stud contacts the molten pool of the material to be welded, causing a short circuit. When this short-circuit occurs, the heat input is insufficient because the proper arc voltage value Va does not continue sufficiently, so that it is impossible to push in a required amount during the pushing, resulting in poor welding.

In order to determine whether the required heat input Qr has been obtained and the quality of welding has been ensured, the following method has recently been proposed in recent years. [Prior Art 1] In the technique of Japanese Patent Application Laid-Open No. 61-242766, quality is determined by measuring and recording welding current and welding voltage, particularly short-circuit current during indentation at the end of welding, using an electromagnetic oscillograph. . [Prior Art 2] The technique of Japanese Patent Application Laid-Open No. 1-154877 detects the amount of movement of a stud and each waveform of a gun coil voltage and a welding current, and starts a pushing start point, a gun coil voltage output stop point, and a welding current short circuit. Of peak point of surge current
The pass / fail of the welding result has been determined from the temporal positional relationship of any two of the points.

[Prior Art 3] The technique disclosed in Japanese Patent Publication No. 3-72388 detects the movement amount (push amount) of a stud and compares the movement amount in a stud pushing process with a standard value to judge quality. I have. [Prior Art 4] The technique of JP-A-7-144275 detects and monitors the arc voltage and the moving state of the stud and measures the arc voltage within 0.3 seconds before the start of pushing, and short-circuiting occurs and the welding voltage is reduced. When it has decreased, a defective fusion defect is determined.

[Prior Art 5] Patent Application Publication No. 58-50
The technique of 0279 uses a microprocessor to control the welding current, calculate the average welding current, the average welding voltage, and the welding current conduction time, and calculate the heat input by multiplying these three values. , Welding current average, welding voltage average,
It stores and displays the welding current conduction time and heat input.
At the end of the main arc period Ta, the set value of the welding current is compared with the actual value, and if the set value is less than the set value, the main arc period Ta is extended to control the required heat input Qr. ing.

[Prior Art 6] JP-A-62-296966
The technique disclosed in Japanese Patent Application Laid-Open No. H11-157556 detects an arc voltage value Va during an auxiliary arc (hereinafter, referred to as an auxiliary arc) period Tp and compares it with a preset reference voltage. Is contaminated with grease or the like), the amount of energy necessary to burn the contaminants on the surface of the material to be welded is increased by increasing the welding current value and / or welding voltage value to be energized. In addition, although the amount of energy required to burn contaminants on the surface of the material to be welded varies from one welding to another, in the prior art 6, the amount of energy required to burn contaminants on the surface of the material to be welded increases. However, the heat input supplied during the main arc period Ta is the predetermined required heat input Q
It does not decrease below r.

[Description of FIG. 1] FIG. 1 is a block diagram of a stud welding apparatus for implementing a conventional method created by the applicant for monitoring a welding voltage, a welding current and a main arc current period according to the above-mentioned prior art. FIG. The figure shows a welding power supply 1 having a substantially constant current characteristic composed of a thyristor or the like using a three-phase power supply 30 as an input, a welding gun 2, a “−” terminal of the output terminal of the welding power supply 1, and , A welded member 14 such as a steel structure for welding a stud, and a connection line connecting the “+” terminal of the output terminal of the welding power supply device 1 and the welded member 14. 42, 4
It is a block diagram of the stud welding apparatus formed with 3 etc.

In the figure, an output terminal voltage Vd detected by a welding voltage detection circuit VC connected to an output terminal of the welding power supply device 1 is averaged by a filter circuit 36, amplified by an amplifier circuit 37, and amplified by an amplifier circuit 37. View by. The reference welding voltage setting circuit 39 sets a proper welding voltage average value Ve when a proper welding voltage is obtained. The output signal of the amplifying circuit 37 is compared with the proper welding voltage average value Ve by the comparator 40. If the absolute value of the difference deviates from the proper welding voltage range allowable value ΔVe,
Activate the alarm 41 to issue an alarm.

Further, in the welding power supply device 1, the welding current detection circuit IC detects an output current Io output to the stud 18 through the secondary cable 17, and outputs a welding current detection signal Ic. The welding current detection signal Ic is averaged by the filter circuit 44, amplified by the amplifier circuit 45, and displayed by the display circuit 12. In the above-described welding power supply device 1, in order to monitor the required heat input Qr during the raising period, the output terminal voltage value Vd, the output current value Io, and the main arc current period Td of the welding power supply device during the raising period.
a is displayed on the display circuit 12.

[0040]

In the above-mentioned prior art 1 to prior art 4 methods, the quality judgment is performed by paying attention to the point in time when the stud is pressed. In these methods, even if the arc is normally started, if a short circuit occurs in the first half of the main arc period Ta, a sufficient heat input can be obtained if the short circuit does not occur in the latter half of the main arc period Ta. However, it is difficult to find welding defects by the above method. Similarly, when the arc start is delayed and the net time of arc generation during the main arc period Ta is shortened, insufficient heat input is not obtained, resulting in poor welding. It was difficult to find the defect.

The above-mentioned prior arts 1 to 5 have the following problems. When performing penetration welding (welding a stud to a steel frame from a deck plate laid on a steel frame) frequently performed at a construction site, there is a gap (clearance) between the deck plate and a material to be welded (a steel frame, etc.). The measured lifting amount is the distance from the position on the deck plate to the raised position. This distance is longer than the distance from the material to be welded (such as a steel frame) by the clearance and the thickness of the deck plate.

The above clearance is generally 1 to 2 mm
However, more cases can occur frequently. If the clearance is long, the distance between the raised end of the stud and the surface of the material to be welded (such as a steel frame) is longer than a preset lifting amount, so that the arc length becomes longer and the arc becomes unstable. Therefore, sufficient heat input cannot be obtained. Also, the pushing amount from the time when the stud comes into contact with the workpiece is actually larger than the set pushing amount.
Shorter by clearance and deck plate thickness. Therefore, when the clearance becomes longer, the pushing becomes insufficient.

In the method of the prior art 4, since the amount of movement of the welding gun movable portion (chuck side) is detected, for example, if the chuck for fixing the stud to the welding gun is loose, the auxiliary arc is generated. To generate an auxiliary arc
When the stud is pulled up to the preset pulling position at the same time as the application of the cutting current, the stud slips and cannot be raised by the set value, so that a short circuit occurs.

Further, when the arc starts, it is welded momentarily,
If the generation of arc is delayed, the chuck and the stud slip when the stud is lifted. In the method of detecting the amount of pushing movement described above, even if such a slip occurs, the position of the stud cannot be accurately detected. Have difficulty.

In the method of the prior art 5, since the energy amount is calculated at the end of the welding cycle, the energy amount cannot be controlled even if it is determined that the energy amount is excessive at the end.

In the method of the prior art 6, the main arc period Ta
Since the heat input is not monitored, if the arc is unstable and a short circuit occurs during the main arc period, the required heat input Qr cannot be obtained. In particular, a short circuit is apt to occur during welding, such as through welding, resulting in insufficient heat input.

Therefore, in the above-mentioned prior arts 1 to 6, the required heat input Qr cannot be supplied accurately.

[0051]

According to a first aspect of the present invention, there is provided a method for stud welding, comprising: raising a stud from a material to be welded, generating an arc, and then pressing the stud by a predetermined amount into the material to be welded. The push-in process is started at time tn when the main arc period integrated heat input Qta3n calculated from the main arc voltage average value Vav (Δt) for each detection interval reaches a preset standard heat input Qst38 for the entire main arc period. This is a method of controlling the cumulative input of heat input for stud welding.

According to a second aspect of the present invention, in the stud welding in which an arc is generated by pulling up a stud from a material to be welded and then the stud is pushed into the material to be welded by a predetermined pushing amount, the integrated voltage value of the main arc period is used. This is a heat input integrated press-in control method for stud welding in which the press-in process is started at time tn when Vta3n reaches a main arc voltage standard value Vst38 in the entire detection period calculated from the standard heat input Qst38 in the entire main arc period set in advance. .

According to a third aspect of the present invention, there is provided a stud welding method in which a stud is pulled up from a material to be welded to generate an arc and then the stud is pushed into the material to be welded by a predetermined amount to be welded. Average value Vav
This is a heat input cumulative press-in control method for stud welding, in which the press-in process starts at time tn when the main arc period cumulative heat input Qta3n calculated from 3n reaches a preset standard heat input Qst38 for the entire main arc period.

According to a fourth aspect of the present invention, in the method of the first aspect, a good welding result can be obtained without causing a short circuit during the main arc period Ta before the start of welding (hereinafter, “normal welding”). The standard heat input Qst38 for the entire main arc period is set in advance, the auxiliary arc current Ip is switched to the main arc current Ia, and from the main arc current / voltage detection start time t3, every detection interval Δt. The main arc at each detection interval
The average voltage Vav (Δt) is measured, and the average heat input value at each detection interval is the product of the average value of the main arc voltage Vav (Δt) at each detection interval and the average welding current Iav during the detection period. ΔQav
To calculate the main arc period integrated heat input Qta3n, and the time t when the main arc period integrated heat input Qta3n reaches the standard heat input Qst38 for the entire main arc period set in advance.
This is a method for controlling the integrated heat input press-in of stud welding in which the press-in step is started at n.

According to a fifth aspect of the present invention, in the method of the second aspect, before the start of welding, the standard heat input Qst38 for the entire main arc period during normal welding is set in advance and the auxiliary arc current Ip is calculated. After switching to the main arc current Ia, the main arc voltage average value Vav (Δt) for each detection interval is measured from the main arc current / voltage detection start time t3 at each detection interval Δt,
The main arc voltage average value Vav (Δt) for each detection interval is integrated to calculate a main arc period integrated voltage value Vta3n, and the main arc period integrated voltage value Vta3n is calculated based on the predetermined main arc period as a whole. The standardized heat input Qst38 is divided by the average welding current value Iav during the detection period, and the integrated heat input and press-in control method for stud welding starts the pressing process at time tn when the main arc voltage standard value Vst38 for the entire detection period is reached. .

According to a sixth aspect of the present invention, in the method of the third aspect, before the start of welding, the standard heat input Qst38 for the entire main arc period during normal welding is set in advance, and the auxiliary arc current Ip is set. After switching to the main arc current Ia, the main arc voltage average value Vav (Δt) for each detection interval is measured from the main arc current / voltage detection start time t3 at each detection interval Δt,
The main arc voltage average value Vav (Δt) at each detection interval is integrated to calculate a main arc period integrated voltage value Vta3n, and the main arc period integrated voltage value Vta3n is divided by the number of detections n to obtain the entire detection period. Of the main arc voltage Vav3n = Vta3n / n, and calculates the main arc voltage average value Vav3n of the entire detection period.
And the main arc integrated heat input Qta3n of the product of the welding current average value Iav during the detection period and the main arc integrated value detection period T3n, and the main arc integrated heat input Qta3n is determined by the above-mentioned predetermined main arc. This is a method for controlling the integrated heat input and press-in of stud welding in which the press-in step is started at time tn when the standard heat input Qst38 of the entire period is reached.

The method of claim 7 is characterized in that the main arc period integrated heat input Qta3n and the auxiliary arc period integrated heat input Q calculated from the main arc voltage average value Vav (Δt) for each detection interval.
The time tn at which the accumulated heat input Qta1n during the period of raising the sum with ta12 (hereinafter referred to as the auxiliary / main arc period) reaches the preset standard heat input Qst18 for the entire auxiliary / main arc detection period.
In this method, the auxiliary arc period Tp during normal welding and the standard heat input Qst18 for the entire auxiliary / main arc detection period are set in advance before starting welding, and the auxiliary arc current is set. From the voltage detection start time t1, the auxiliary arc voltage average value Vav12 is measured, and the product of the auxiliary arc voltage average value Vav12, the auxiliary arc current value Ip, and the auxiliary arc detection period T12 is obtained. The auxiliary arc period accumulated heat input Qta12 is calculated, and then the main arc current Ia is calculated from the auxiliary arc current Ip.
The main arc voltage / average value Vav (Δt) at each detection interval is measured at every detection interval Δt from the main arc current / voltage detection start time t3, and the main arc voltage at each detection interval is measured.
The average heat input amount ΔQav for each detection interval of the product of the arc voltage average value Vav (Δt) and the welding current average value Iav during the detection period is integrated up to the number of detections n and the main arc period integrated heat input Qta3n
The auxiliary / main arc period integrated heat input Qta1n, which is the sum of the auxiliary arc period integrated heat input Qta12 and the main arc period integrated heat input Qta3n, is calculated as the standard for the preset auxiliary / main arc detection period. This is a method of controlling the cumulative heat input and press-in of stud welding in which the press-in step is started at time tn when the heat input amount Qst18 is reached.

The method according to claim 8 calculates the standard heat input Qst38 for the entire main arc period by subtracting the integrated heat input Qta12 for the auxiliary arc period from the standard heat input Qst18 for the entire auxiliary / main arc detection period. The integrated voltage value Vta3n of the main arc period according to claim 5 is the standard heat input Q over the entire main arc period.
Main arc voltage standard value V for the entire detection period calculated from st38
This is a method of starting the indentation process at time tn when st38 is reached. Before the start of welding, the standard heat input Qst during the normal auxiliary arc period Tp and the auxiliary / main arc detection period during normal welding.
18 is set in advance, the auxiliary arc voltage average value Vav12 is measured from the auxiliary arc current / voltage detection start time t1, and this auxiliary arc voltage average value Vav12 and the auxiliary arc current value are measured. An auxiliary arc period integrated heat input Qta12, which is the product of Ip and the auxiliary arc detection period T12, is calculated, and the auxiliary arc period integration is performed from the standard heat input Qst18 for the entire auxiliary / main arc detection period set in advance. The accumulated heat input Qta3n in the main arc period is calculated by subtracting the heat input Qta12, and then the auxiliary arc current Ip is calculated.
To the main arc current Ia, and from the main arc current / voltage detection start time t3, the main arc voltage average value Vav (Δt) for each detection interval is measured at every detection interval Δt. The main arc period integrated voltage value Vta (n) is integrated to calculate a main arc period integrated voltage value Vta3n, and the main arc period integrated voltage value Vta3n is calculated by the main arc period integrated heat input amount Qta3n previously calculated. This is a method for controlling the integrated heat input and press-in of stud welding in which the press-in process is started at time tn when the main arc voltage standard value Vst38 of the entire detection period is divided by the welding current average value Iav during the detection period.

According to the method of claim 9, the integrated heat input Qta3n of the main arc period and the integrated heat input Qta12 of the auxiliary arc period calculated from the main arc voltage average value Vav3n for the entire detection period of claim 6 are provided.
The auxiliary heat / main arc period accumulated heat input Qta1n is the standard heat input Qst for the entire auxiliary / main arc detection period.
18 is a method of starting the pushing process at time tn when the auxiliary arc period T at the time of normal welding is started before the start of welding.
p and the standard heat input Qst18 for the entire auxiliary / main arc detection period
The auxiliary arc voltage average value Vav12 is measured from the auxiliary arc current / voltage detection start time t1, and
The auxiliary arc voltage average value Vav12 and the auxiliary arc current value I
The auxiliary arc period integrated heat input Qta12, which is the product of p and the auxiliary arc detection period T12, is calculated. Then, the auxiliary arc current Ip is switched to the main arc current Ia to obtain the main arc current / voltage. From the detection start time t3, the main arc voltage average value Vav (Δt) at each detection interval is measured at each detection interval Δt, and the main arc voltage average value Vav (Δt) at each detection interval is integrated. The main arc period integrated voltage value Vta3n is calculated, and the main arc period integrated voltage value Vta3n is divided by the number of detections n to calculate a main arc voltage average value Vav3n = Vta3n / n for the entire detection period.
The main arc voltage average value Vav3n during the entire detection period, the welding current average value Iav during the detection period, and the main arc integrated value detection period T
Calculate the integrated heat input Qta3n of the main arc period, which is the product of the product of 3n, and calculate the auxiliary / main arc period integrated heat input Qta1n of the sum of the auxiliary arc period integrated heat input Qta12 and the main arc period integrated heat input Qta3n.
This is a method of controlling the accumulated heat input and press-in of stud welding in which the press-in step is started at time tn when the standard heat input Qst18 in the entire auxiliary / main arc detection period is reached.

The method of claim 10 is the method of claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9.
Before the start of welding, the number [mS
ec] and a standard value for securing the heat input standard value ΔQst for each detection interval Δt when no short circuit occurs (hereinafter referred to as a heat input standard value for each detection interval) and a standard heat input Qst38 for the entire main arc period. The allowable number of heat input short-circuits Nst is set in advance, and the main arc voltage average value Vav (Δt) is measured for each detection interval Δt from the main arc current / voltage detection start time t3. Main arc voltage average value Vav (Δt) for each detection interval and welding current average value Ia during the detection period
The average value of the heat input for each detection interval Δt of the product of
Calculate ΔQav)
The number of short-circuits Ns at which the average value of heat input ΔQav at each detection interval is lower than the standard value of heat input at each detection interval ΔQst is counted, and the number of short-circuits Ns is equal to or more than the preset standard number of allowable heat input short-circuit Nst. This is a stud welding integrated heat input push-in control method in which a welding defect is displayed when it becomes.

The method according to claim 11 is the method according to claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9.
Before the start of welding, the number [mS
ec] and the detection interval Δt at which no short circuit occurs
The heat input standard value ΔQst for each appropriate detection interval and the standard heat input allowable short circuit count Nst for securing the standard heat input Qst38 for the entire main arc period are set in advance, and from the main arc current / voltage detection start time t3, At each detection interval Δt, the main arc voltage average value Vav (Δt) at each detection interval is measured, and the main arc voltage average value Vav (Δt) at each detection interval and the welding current average value during the detection period are measured. The average heat input amount ΔQav for each detection interval of the product of Iav is calculated, and the number of short circuits Ns in which the average heat input amount ΔQav for each detection interval is lower than the standard heat input amount ΔQst for each detection interval is counted. When the number of short-circuits Ns is equal to or greater than the preset standard allowable number of heat input short-circuits Nst, a heat input cumulative push-in control method for stud welding is provided in which the energizing time of the main arc current Ia is further added for a preset time.

A method according to claim 12 is the method according to claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9.
Alternatively, in the stud welding heat input integrated push-in control method, the welding current average value Iav during the detection period according to claim 10 or 11 is a main arc current set value set in the welding power supply device having a constant current output characteristic. is there.

The method of claim 13 is the method of claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9.
The main arc current output from the welding power supply device having a constant current output characteristic measured after the main arc current / voltage detection start time t3 when the welding current average value Iav during the detection period according to claim 10 or 11 is obtained. This is a method for controlling the cumulative input of heat input for stud welding, which is a measured value.

The method of claim 14 is the method of claim 4 or claim 5 or claim 6 or claim 7 or claim 8 or claim 9.
Alternatively, the welding current average value Iav during the detection period according to claim 10 or 11 is calculated from the main arc current / voltage detection start time t3 at each detection interval Δt calculated at each detection interval Δt.
This is a method for controlling the cumulative heat input and press-in of stud welding, which is a value calculated by integrating the average current value Iav (Δt) from one detection to n detections.

According to a fifteenth aspect of the present invention, the auxiliary arc current value Ip of the seventh, eighth, or ninth aspect is the auxiliary arc current set value set in the welding power supply having a constant current output characteristic. This is a control method for controlling the cumulative heat input of certain stud welding.

The method according to claim 16 is a method for welding the constant current output characteristic in which the auxiliary arc current value Ip according to claim 7 or claim 8 or 9 is measured from the auxiliary arc current / voltage detection start time t1. This is a method for controlling the cumulative heat input and press-in of stud welding, which is the measured value of the auxiliary arc current output from the power supply device.

[0070]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a fourth aspect of the present invention, there is provided a method for controlling the integrated heat input and press-in of stud welding according to the present invention. This is a method in which the pushing process is started at time tn when the heat quantity Qta3n reaches the standard heat input Qst38 of the entire main arc period, as follows. (A) Prior to the start of welding, as shown in FIG. 2, the standard heat input Qst38 for the entire main arc period during normal welding is set in advance by Equations 1 to 3. (B) At the start of the energization of the auxiliary arc current t0, the start switch 13 of the welding gun 2 is depressed to set the auxiliary arc current Ip.
And the stud 18 is connected to the workpiece 1.
4 to raise an auxiliary arc. (C) The auxiliary arc current Ip is switched to the main arc current Ia at the main arc current energization start time t2 after the lapse of the auxiliary arc period Tp. (D) As shown in FIG. 3, from the start time t3 of the main arc current / voltage detection, the main arc current average value Iav (Δt) for each detection interval and the main arc current for each detection interval are set for each detection interval Δt.
The average voltage Vav (Δt) is measured. (E) The main arc voltage average value Vav (Δ
t) and the average of the heat input amount ΔQav for each detection interval of the product of the product of the welding current average value Iav during the detection period or the main arc current average value Iav (Δt) for each detection interval. The calorie Qta3n is calculated. (F) At the time tn when the accumulated heat input Qta3n of the main arc period reaches the standard heat input Qst38 of the entire main arc period set in advance, the pushing process is started.

[0071]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In stud welding, an auxiliary arc current Ip is started by pressing a start switch 13 of a welding gun 2, and an auxiliary arc is generated by pulling up a stud 18 from a workpiece 14 to be welded. Next, when the filter auxiliary arc period Tp has elapsed, the auxiliary arc current Ip is reduced to the main arc current Ip.
After the preset main arc period Ta elapses, the stud during arc generation is pushed into the workpiece and short-circuited with the workpiece, and after the short-circuit current Is has been applied for the preset short-circuit period Ts, The welding current is cut off and the welding is terminated.

[Explanation of FIG. 2] FIG. 2A is an explanatory diagram for calculating the welding current average value Iav during the detection period from the output current Io during the entire main arc period during normal welding. B) shows the main arc at each detection interval Δt from the output terminal voltage Vd during the entire main arc period during normal welding.
FIG. 4C is an explanatory diagram for calculating an average voltage Vav (Δt), and FIG. 4C is a diagram showing a stud lifting distance during normal welding.

As shown in FIG. 9A, at the time point t0 when the auxiliary arc current is supplied, the start switch 13 is pressed to start supplying the auxiliary arc current Ip, and the stud 18 is removed from the workpiece 14 by the welding. Pull up to generate an auxiliary arc.

From the auxiliary arc current energization start time t0 or the main arc current energization start time t2 described later, a welding current detection circuit IC and a welding voltage detection circuit VC shown in FIG.
Thus, the welding voltage value V1 (t) at each time t and the welding current value I1 (t) at each time t are detected at a predetermined detection interval Δt, and a main address at each detection interval Δt is detected at each detection interval Δt. -Average voltage Vav (△ t) and main arc current average Iav (△ t).
Calculate t).

Next, at the time t2 when the main arc current starts to flow, the auxiliary arc current Ip is switched to the main arc current Ia. During the main arc heat input standard value setting period T38 from the main arc current / voltage detection start time t3 immediately after the main arc current energization start time t2 described above to the main arc current / voltage detection end time t8, Detecting the welding voltage value V1 (t) at time t,
The main arc voltage average value Vav (Δt) is calculated for each detection interval when a short circuit does not occur. Similarly, the welding current value I1 (t) at each time t is detected, and the main arc current average value Iav (Δt) for each detection interval when no short circuit occurs is calculated.

[Explanation of Equation 1] The main arc current / voltage detection start time t3 to the main arc current / voltage detection end time t3
8, the main arc voltage average value Vav (Δt) for each detection interval and the main arc voltage for each detection interval.
The average current Iav (Δt) is calculated, and the average heat input amount ΔQav for each detection interval is calculated by Equation 1.

(Equation 1)

Since the total heat input when the normal welding operation is performed is substantially constant, the total heat input when the normal welding operation is performed is determined by the diameter of the welding stud and the material 14 to be welded.
And the standard heat input Qst for the entire detection period selected according to the conditions (1) and the welding posture (downward, lateral, etc.).

[Explanation of Equation 2] Hereinafter, as shown in FIGS. 2A and 2B, the period from the start of the main arc current / voltage detection t3 to the end of the main arc current / voltage detection t8. An equation for calculating the standard heat input Qst for the entire detection period during normal welding will be described. According to the first expression on the right side of Expression 2, the average heat input amount ΔQav for each detection interval is integrated from the main arc current / voltage detection start time t3 to the main arc current / voltage detection end time t8, and the detection period is calculated. Overall standard heat input Qst
Is calculated.

(Equation 2)

[Explanation of Equation 3] As shown in FIGS. 2A and 2B, the above-mentioned main arc current / voltage detection start time t3
The detection start time of the detection interval .DELTA.t is t01, and the detection start time of the detection interval .DELTA.t at the main arc current / voltage detection end time t8 is t0n. Therefore, the first detection interval Δt
Detection interval Δt from the detection start time t01
Heat input Q over the entire detection period up to the detection start point t0n
st may be calculated by the second expression on the right side of Equation 2.

Also, instead of calculating the standard heat input amount Qst for the entire detection period by the above equation 2, the main arc current is calculated from the first detection interval Δt at the main arc current / voltage detection start time t3.
The standard heat input Qst for the entire detection period up to the n-th detection interval Δt at the end of the current / voltage detection time t8 is expressed by the following equation (3).
May be calculated.

(Equation 3)

[Explanation of FIG. 3] FIG. 3A is an explanatory diagram for calculating the welding current average value Iav during the detection period from the output current Io during the entire main arc period during each welding, and FIG. )
FIG. 7 is an explanatory diagram for calculating the main arc voltage average value Vav (Δt) at each detection interval Δt from the output terminal voltage Vd during the entire main arc period during each welding.

When a power supply of a substantially constant current control type using a semiconductor switching element such as a thyristor is used as the welding power supply 1 described with reference to FIG. 1, the main arc current supply start time t2 to the short-circuit current supply end time t10. During this period, a constant current in which the output current Io is controlled to be substantially constant flows.

At the end of the main arc current application, that is, at the start time t9 of the short-circuit current application, when the push-in operation is started and short-circuited, as shown in FIG. Flows. This steep increase in current is in a range that can be ignored compared to the average value of the main arc current Ia. Thus, the output current Io during the main arc period Ta
In this method, the average value of the main arc current Iav (Δt) at each detection interval is not measured, and only the average value Vav of the welding voltage during the detection period is measured, since the average is almost constant both at the time of the arc and the momentary short circuit. You may.

Next, referring to FIGS. 3A and 3B,
Formula for calculating integrated heat input Qta that does not cause a short circuit from main arc current / voltage detection start time t3 to main arc current / voltage detection end time tn that has reached standard heat input Qst for the entire detection period. explain.

[Explanation of Equation 4] From the first equation on the right side of Equation 4, the input from the main arc current / voltage detection start point t3 to the main arc current / voltage detection end point tn at each detection interval is performed. The heat quantity average value ΔQav is integrated to calculate an integrated heat input quantity Qta.

(Equation 4)

The above-described main arc current / voltage detection start time t
The detection start time of the detection interval Δt of No. 3 is t01, and the main arc is detected.
The detection start time of the detection interval Δt of the current / voltage detection end time tn is t0n. Therefore, the first detection interval Δ
n detection interval Δ from the detection start time t01 of t
The accumulated heat input amount Qta up to the detection start time t0n of t may be calculated by the second expression on the right side of Expression 4.

[Explanation of Equation 5] Further, instead of calculating the integrated heat input amount Qta by the above Equation 4, the main arc current is calculated from the first detection interval Δt at the main arc current / voltage detection start time t3.
The accumulated heat input Qta up to the n-th detection interval Δt at the end of the current / voltage detection time tn may be calculated by Equation 5.

(Equation 5)

[Description of FIG. 4] FIG. 4A is an explanatory diagram for calculating the main arc current average value Iav (Δt) for each detection interval from the output current Io during the entire main arc period during each welding. Yes,
FIG. 7B shows the main arc at each detection interval from the output terminal voltage Vd during the main arc period during each welding.
FIG. 4 is an explanatory diagram for calculating a peak voltage average value Vav (Δt).

Next, referring to FIGS. 4A and 4B,
Formula for calculating integrated heat input Qta that does not cause a short circuit from main arc current / voltage detection start time t3 to main arc current / voltage detection end time tn that has reached standard heat input Qst for the entire detection period. explain.

[Explanation of Equation 6] The integrated heat input Qta is calculated by calculating the average value of the heat input ΔQav for each detection interval from the main arc current / voltage detection start time t3 to the main arc current / voltage detection end time t3.
Up to n, it is calculated by the first expression on the right side of Expression 6.

(Equation 6)

The main arc current / voltage detection start time t
The detection start time of the detection interval Δt of No. 3 is t01, and the main arc is detected.
The detection start time of the detection interval Δt of the current / voltage detection end time tn is t0n. Therefore, the first detection interval Δ
n detection interval Δ from the detection start time t01 of t
The accumulated heat input amount Qta up to the detection start time t0n of t may be calculated by the second equation on the right side of Expression 6.

[Explanation of Equation 7] Also, instead of calculating the integrated heat input amount Qta by the above Equation 4, the main arc current is calculated from the first detection interval Δt at the main arc current / voltage detection start time t3.
The accumulated heat input amount Qta up to the n-th detection interval Δt at the end of the current / voltage detection time tn may be calculated by Expression 7.

(Equation 7)

Next, the auxiliary arc current value Ip is measured from the auxiliary arc current / voltage detection start time t1 during the auxiliary arc period Tp, and the auxiliary arc voltage average value Vav12 is measured to determine the auxiliary arc current value. The case where the arc period integrated heat input amount Qta12 is calculated will be described.

In normal stud welding, the auxiliary arc period Tp shown in FIG. 2 is 0.1 to 0.2 [sec].
The main arc period Ta is 0.4 to 1.5 [sec], the short-circuit period Ts is about 0.2 [sec], and the auxiliary arc period is
The arc period Tp is a conduction time that is about 1/10 of that of the main arc period Ta, and the auxiliary arc current value Ip is the main arc period.
Since it is smaller than the arc current value Ia, the calculation of the auxiliary arc period accumulated heat input Qta12 is omitted to simplify the control circuit.

However, depending on the welding conditions, the auxiliary arc period integrated heat input Qta12 may be replaced by the main arc period integrated heat input Qta3n.
In this case, the auxiliary arc period integrated heat input Qta12 is calculated from the auxiliary arc current average value Ip, the auxiliary arc voltage average value, and the auxiliary arc period Tp. . As described above, since the auxiliary arc period Tp is shorter than the main arc period Ta, the auxiliary arc current average value Ip and the auxiliary arc voltage average value are different from the main arc period Ta at each detection interval. As in the case of the average current value Iav (Δt) and the main arc voltage average value Vav (Δt) for each detection interval, the detection interval Δt
It is not necessary to calculate the average value of the auxiliary arc voltage Vav12 and the average value of the auxiliary arc voltage Vav12 from the auxiliary arc current / voltage detection start time t1. It is sufficient to calculate the auxiliary arc period accumulated heat input Qta12 from Ip.

As shown in the following equation, the auxiliary arc period integrated heat input Qta12 is obtained by measuring the auxiliary arc voltage average value Vav12 from the auxiliary arc current / voltage detection start time t1. -Average voltage value Vav12 and auxiliary arc current value Ip
And the auxiliary arc detection period T12. auxiliary·
The main arc period integrated heat input Qta1n is calculated by the main arc period integrated heat input Qta3n and the auxiliary arc period integrated heat input calculated from the main arc voltage average value Vav (Δt) for each detection interval as shown in the following equation. It is the sum with Qta12. Qta12 = Vav12 ・ Ip ・ T12 Qta1n = Qta12 + Qta3n

[Description of FIG. 5] FIG. 5 shows the main arc period Ta.
It is a figure which shows the welding voltage waveform and the welding current waveform when the stud 18 is short-circuited temporarily to the molten pool due to pulling failure, partial melting due to an abnormal arc phenomenon or the like.

During the main arc period Ta, if the stud 18 is temporarily short-circuited to the molten pool due to a pull-up failure, an abnormal arc phenomenon, for example, one-side melting due to magnetic blowing, etc. Since the average value ΔQas decreases, many short circuits occur during the main arc period Ta, and the integrated heat input amount Qta decreases.

By integrating from the main arc current / voltage detection start time t3, the integrated heat input Qta at the time tn when the standard heat input Qst for the entire detection period coincides with or exceeds the integrated heat input Qta, It is calculated by Equations 4 to 7.

The output terminal voltage Vd when a short circuit occurs during the main arc period Ta is the output terminal voltage average value Vas (Δt) when a short circuit occurs at each detection interval. Vav decreases. The output current Io at this time is the average output current value Ias (Δt) when a short circuit occurs at each detection interval. If the output characteristics of the welding power supply device are constant current characteristics, the welding current during the detection period is The average value Iav hardly changes, and when the output characteristics of the welding power supply device are not constant current characteristics such as drooping characteristics, the welding current average value Iav during the detection period slightly increases.

[Explanation of FIG. 6] FIG. 6A is a welding current waveform diagram showing a waveform of the output current Io when a micro short circuit occurs during the main arc period Ta, and FIG. Output terminal voltage Vd when short circuit occurs during main arc period Ta
It is a figure which shows the waveform of.

As shown in FIG. 6, in the above-described embodiment, when the welding time is long, such as in the case of large diameter stud welding, in the case of penetration welding, in the case of horizontal welding, etc., a minute short circuit frequently occurs. Even so, the accumulated heat input Qta hardly decreases. However, when these short circuits occur frequently,
There is a high possibility that the weld will become defective.

In this case, the detection interval Δt for calculating the average heat input amount ΔQav for each detection interval is set to a number [mSec] smaller than the time of one occurrence of a micro short-circuit that may become a defect in the welded portion. Set forth in Next, the appropriate value of the average value of heat input ΔQav for each detection interval when a normal welding operation is performed is determined according to the diameter of the welding stud, the condition of the workpiece 14 and the welding position (downward, sideways, etc.). It is determined as a heat input standard value ΔQst for each detection interval. The heat input average value ΔQav for each predetermined detection interval is calculated for each detection interval Δt,
This is compared with the heat input standard value ΔQst for each detection interval. The number of short-circuits Ns at which the average value of heat input ΔQav at each detection interval is lower than the standard value of heat input at each detection interval ΔQst is counted, and the number of short-circuits Ns is equal to or more than the preset standard number of allowable heat input short-circuit Nst. Is determined to be poor welding.

Using the above determination results, Equations 4 to 1
At the end of the stud welding with the integrated heat input Qta of the method calculated in Step 2, the fact that the number of minute short circuits has exceeded the allowable range is displayed, and the heat input is further added.

[Explanation of Expressions 8 to 12] As shown by the reference numerals Vav and Iav at the right end of FIGS. 4A and 4B, the welding current average value Iav during the detection period and the welding voltage average during the detection period are shown. The value Vav may be calculated and multiplied by the main arc heat input standard value setting period T38 to calculate the integrated heat input amount Qta.

Main arc voltage average value Vav for each detection interval
(Δt) is integrated from the number of detections of 1 to n times, and the main arc period integrated voltage value Vta3n is calculated by Expression 8.

(Equation 8) The main arc current average value Iav (Δt) for each detection interval is integrated from the number of detections of 1 to n times, and the main arc period integrated current value Ita3n is calculated by Expression 9.

(Equation 9)

By dividing the main arc period integrated voltage value Vta3n calculated by Expression 8 by the number of detections n, the welding voltage average value Vav during the detection period is calculated by Expression 10.

(Equation 10) The average value Iav of the welding current during the detection period is calculated by Expression 11 by dividing the main arc period integrated current value Ita3n calculated by Expression 9 by the number of detections n.

[Equation 11]

After multiplying the welding voltage average value Vav during the detection period calculated by Equation 10 and the welding current average value Iav during the detection period calculated by Equation 11 by the main arc integrated value detection period T3n, From the equation 12, the integrated heat input amount Qta is calculated.

(Equation 12)

[Explanation of the Fourth Embodiment] The method of the fourth embodiment is characterized in that the main arc period integrated heat input Qta3n calculated from the main arc voltage average value Vav (Δt) for each detection interval is equal to the main arc period. This is a method in which the pushing process is started at time tn when the total standard heat input Qst38 is reached. Hereinafter, this method will be described with reference to FIGS. (A) Prior to the start of welding, the standard heat input Qst38 for the entire main arc period during normal welding is set in advance by Equations 1 to 3.

(B) At the time point t0 when the auxiliary arc current is started, the start switch 13 of the welding gun 2 is pressed to start the supply of the auxiliary arc current Ip and the stud 18 is started.
Is lifted from the workpiece 14 to generate an auxiliary arc. (C) The auxiliary arc current Ip is switched to the main arc current Ia at the main arc current energization start time t2 after the lapse of the auxiliary arc period Tp.

(D) As shown in FIG.
From the voltage detection start time t3, the main arc voltage average value Vav (Δt) is measured at each detection interval Δt. (E) The main arc voltage average value Vav (Δ
The average heat input amount ΔQav for each detection interval of the product of t) and the welding current average value Iav during the detection period is integrated to calculate the main arc period integrated heat input Qta3n by any one of Equations 4 to 7.

(F) This main arc period integrated heat input Qta3n
Is the standard heat input Qst38 for the entire main arc period set in advance.
At the time point tn when the pressure reaches. Qta3n> = Qst38 (G) The welding current average value Iav during the detection period is a value calculated by the method of claim 12, claim 13, or claim 14.

[Explanation of the embodiment of claim 5] In the method of claim 5, the main arc period integrated voltage value Vta3n is calculated based on the standard heat input Qst38 of the entire main arc period. This is a method of starting the pushing process at time tn when the voltage reaches Vst38. Hereinafter, this method will be described with reference to FIGS. Descriptions of (A) to (D) and (H) are the same as those of the fourth embodiment, and will not be repeated.

(E5) The main arc voltage average value Vav (Δt) for each detection interval is integrated to obtain the main arc period integrated voltage value Vt.
a3n is calculated by Expression 8. (F5) Standard heat input Q for the entire main arc period set in advance
The main arc voltage standard value Vst38 for the entire detection period is calculated by dividing st38 by the welding current average value Iav during the detection period. Vst38 = Qst38 / Iav

(G5) This main arc period integrated voltage value Vta
The pushing process is started at time tn when 3n reaches the main arc voltage standard value Vst38 for the entire detection period. Vta3n> = Vst38

[Explanation of an embodiment of claim 6] In the method of claim 6, the main arc period integrated heat input Qta3n calculated from the main arc voltage average value Vav3n for the entire detection period is the standard heat input for the entire main arc period. This is a method of starting the pressing process at time tn when Qst38 is reached. Hereinafter, this method will be described with reference to FIGS. Descriptions of (A) to (D) and (H) are the same as those of the fourth embodiment, and will not be repeated.

(E61) The main arc voltage average value Vav (Δt) for each detection interval is integrated to calculate a main arc period integrated voltage value Vta3n according to equation (8). (E62) This main arc period integrated voltage value Vta3n is divided by the number of detections n to obtain a main arc voltage average value Vav for the entire detection period.
3n = Vta3n / n is calculated by Expression 10.

(F6) The main arc period integrated heat input Q which is the product of the main arc voltage average value Vav3n during the entire detection period, the welding current average value Iav during the detection period, and the main arc integrated value detection period T3n.
ta3n is calculated by Expression 12. (F) At the time tn when the accumulated heat input Qta3n of the main arc period reaches the standard heat input Qst38 of the entire main arc period set in advance, the pushing process is started. Qta3n> = Qst38

[Explanation of the embodiment of claim 7] The method of claim 7 is the method of claim 4, wherein the main arc voltage average value V for each detection interval is set.
The auxiliary / main arc period integrated heat input Qta1n, which is the sum of the main arc period integrated heat input Qta3n calculated from av (Δt) and the auxiliary arc period integrated heat input Qta12, is the standard heat input for the entire auxiliary / main arc detection period. This is a method of starting the pushing process at time tn when Qst18 is reached. Hereinafter, this method will be described with reference to FIGS. (A7) Before starting welding, the standard heat input Qst during the auxiliary arc period Tp and the auxiliary / main arc detection period during normal welding.
Set 18 in advance. The standard heat input amount Qst38 for the entire main arc period is calculated by Expressions 1 to 3.

(B) At time t0 when the auxiliary arc current is started, the start switch 13 of the welding gun 2 is pressed to start the supply of the auxiliary arc current Ip and the stud 18 is started.
Is lifted from the workpiece 14 to generate an auxiliary arc. (B71) The auxiliary arc voltage average value Vav12 is measured from the start point t1 of the auxiliary arc current / voltage detection. (B72) The auxiliary arc voltage average value Vav12 and the auxiliary
An auxiliary arc period integrated heat input Qta12, which is the product of the arc current value Ip and the auxiliary arc detection period T12, is calculated. Qta12 = Vav12 ・ Ip ・ T12

(C) The auxiliary arc current Ip is switched to the main arc current Ia at the main arc current energization start time t2 after the lapse of the auxiliary arc period Tp. (D) From the start time t3 of the main arc current / voltage detection, at every detection interval Δt, the main arc voltage average value V at each detection interval.
Measure av (Δt).

(E) The average value of the heat input amount ΔQav at each detection interval is integrated by multiplying the average of the product of the main arc voltage average value Vav (Δt) at each detection interval and the welding current average value Iav during the detection period. The arc period integrated heat input amount Qta3n is calculated by any one of Expressions 4 to 7. (F7) The auxiliary / main arc period integrated heat input Qta1n, which is the sum of the auxiliary arc period integrated heat input Qta12 and the main arc period integrated heat input Qta3n, is the standard heat input Qst18 for the entire auxiliary / main arc detection period set in advance. At the time point tn when the pressure reaches. Qta1n = Qta12 + Qta3n Qta3n> = Qst18 (G) The welding current average value Iav during the detection period is a value calculated by the method of claim 12, claim 13, or claim 14.

[Explanation of the embodiment of claim 8] The method of claim 8 relates to the standard heat input Qst18 for the entire auxiliary / main arc detection period.
The standard heat input Qst38 for the entire main arc period is calculated by subtracting the integrated heat input Qta12 for the auxiliary arc period from the following equation. This is a method in which the pushing process is started at time tn when the main arc voltage standard value Vst38 of the entire detection period calculated from is reached. Hereinafter, referring to FIGS. 2 and 3,
This method will be described. (A7) Before starting welding, the standard heat input Qst during the auxiliary arc period Tp and the auxiliary / main arc detection period during normal welding.
Set 18 in advance. The standard heat input amount Qst38 for the entire main arc period is calculated by Expressions 1 to 3.

(B) At the start of the auxiliary arc current energization time t0, the start switch 13 of the welding gun 2 is pressed to start the energization of the auxiliary arc current Ip and the stud 18
Is lifted from the workpiece 14 to generate an auxiliary arc. (B71) The auxiliary arc voltage average value Vav12 is measured from the start point t1 of the auxiliary arc current / voltage detection.

(B72) The average value of the auxiliary arc voltage Vav
An auxiliary arc period integrated heat input Qta12 is calculated by multiplying the auxiliary arc current value Ip with the auxiliary arc detection period T12. Qta12 = Vav12 · Ip · T12 (B8) Standard heat input Qst during the entire auxiliary / main arc detection period
The auxiliary arc period integrated heat input Qta12 is subtracted from 18 to calculate the main arc period integrated heat input Qta3n. Qta3n = Qst18-Qta12

(C) The auxiliary arc current Ip is switched to the main arc current Ia at the main arc current energization start time t2 after the lapse of the auxiliary arc period Tp. (D) From the start time t3 of the main arc current / voltage detection, at every detection interval Δt, the main arc voltage average value V at each detection interval.
Measure av (Δt).

(E5) The main arc voltage average value Vav (Δt) for each detection interval is integrated to obtain a main arc period integrated voltage value Vt.
a3n is calculated by Expression 8. (F8) The main arc voltage standard value Vst38 for the entire detection period is calculated by dividing the accumulated heat input Qta3n of the main arc period by the average welding current value Iav during the detection period. Vst38 = Qst38 / Iav (G5) At the time tn when the integrated voltage value Vta3n of the main arc period reaches the main arc voltage standard value Vst38 for the entire detection period, the pushing process is started. Vta3n> = Vst38

[Explanation of the embodiment of claim 9] The method of claim 9 is the method of claim 6, wherein the main arc voltage average value V over the entire detection period is used.
The auxiliary / main arc period integrated heat input Qta1n, which is the sum of the main arc period integrated heat input Qta3n calculated from av3n and the auxiliary arc period integrated heat input Qta12, reaches the standard heat input Qst18 for the entire auxiliary / main arc detection period. This is a method of starting the pressing process at the time point tn. This method will be described with reference to FIG. (A7) Before starting welding, the standard heat input Qst during the auxiliary arc period Tp and the auxiliary / main arc detection period during normal welding.
Set 18 in advance. The standard heat input amount Qst38 for the entire main arc period is calculated by Expressions 1 to 3.

(B) At time t0 when the auxiliary arc current is started, the start switch 13 of the welding gun 2 is pressed to start supplying the auxiliary arc current Ip, and the stud 18 is turned on.
Is lifted from the workpiece 14 to generate an auxiliary arc. (B71) The auxiliary arc voltage average value Vav12 is measured from the start point t1 of the auxiliary arc current / voltage detection. (B72) The auxiliary arc voltage average value Vav12 and the auxiliary
An auxiliary arc period integrated heat input Qta12, which is the product of the arc current value Ip and the auxiliary arc detection period T12, is calculated. Qta12 = Vav12 ・ Ip ・ T12

(C) At time t2 when the main arc current starts to flow after the lapse of the auxiliary arc period Tp, the auxiliary arc current Ip is switched to the main arc current Ia. (D) From the start time t3 of the main arc current / voltage detection, at every detection interval Δt, the main arc voltage average value V at each detection interval.
Measure av (Δt).

(E61) The main arc voltage average value Vav (Δt) for each detection interval is integrated to calculate a main arc period integrated voltage value Vta3n according to equation (8). (E62) This main arc period integrated voltage value Vta3n is divided by the number of detections n to obtain a main arc voltage average value Vav for the entire detection period.
3n is calculated by Expression 10.

(F6) Main arc period integrated heat input Q which is the product of main arc voltage average value Vav3n during the entire detection period, welding current average value Iav during the detection period, and main arc integrated value detection period T3n.
ta3n is calculated by Expression 12. (G6) The auxiliary / main arc period integrated heat input Qta1n, which is the sum of the auxiliary arc period integrated heat input Qta12 and the main arc period integrated heat input Qta3n, is the standard heat input Qst18 for the entire auxiliary / main arc detection period set in advance. At the time point tn when the pressure reaches. Qta1n> = Qst18

[Explanation of Embodiment of Claim 10] Claim 10
This method is a method of displaying a welding defect when the number Ns of short circuits becomes equal to or more than a preset number, in addition to the methods of claims 4 to 9.

The method of claim 10 adds the following three requirements in addition to the components of claims 4 to 9. As shown in FIG. 6, before the start of welding, 検 出 the number of detection intervals Δt shorter than the time of one occurrence of a micro short-circuit that may become a defect in the welded portion [mSec] and 〓 the amount of heat input per detection interval Standard value ΔQst and standard heat input Qst38 for the entire main arc period during normal welding
Is set in advance.

From the main arc current / voltage detection start time t3, the main arc voltage average value Vav (Δt) is measured at each detection interval Δt. Main arc voltage average value Vav (Δt) for each detection interval and welding current average value Ia during the detection period
The heat input average value ΔQav for each detection interval of the product of “v” is calculated. ΔQav = Vav (Δt) · Iav The number of short circuits Ns in which the average heat input amount ΔQav for each detection interval is lower than the standard heat input amount ΔQst for each detection interval is counted. ΔQav <Δ
Qst If the number Ns of short circuits is equal to or greater than the preset number Nst of allowable heat input short circuits, welding failure is displayed. Ns> Nst The welding current average value Iav during the detection period is defined by claim 12
Alternatively, it is a value calculated by the method of claim 13 or claim 14.

[Explanation of Embodiment of Claim 11] Claim 11
In addition to the method of claim 4 to claim 9, the method of adding the energizing time of the main arc current Ia for a preset time when the number of short circuits Ns is equal to or more than the preset standard heat input allowable number of short circuits Nst. It is. The method of claim 10 is a method of displaying a welding defect when the number of short circuits Ns is equal to or greater than a preset standard allowable heat input short circuit number Nst, whereas the method of claim 11 is such that the number of short circuits Ns is preset. This is a method of adding the energizing time of the main arc current Ia for a preset time when the standard heat input allowable short circuit count Nst or more is reached. The method and other configurations of the tenth aspect are the same as those of the eleventh aspect, and thus description thereof is omitted.

The method of claim 12 employs a main arc current set value set in a welding power supply device having a constant current output characteristic as the welding current average value Iav during the detection period of claims 4 to 11. doing.

When the output characteristic of the welding power supply device is a constant current characteristic, a current of the welding current average value Iav flows during the detection period of the value set in the welding power supply device unless a failure occurs in the welding power supply device. Therefore, in the method according to the twelfth aspect, it is only necessary to connect the signal detection lead wire and measure only the main arc voltage average value Vav (Δt) at each detection interval. There is no need for a welding current detector for measuring the current average value Iav. When a failure occurs in the welding power supply, an abnormality occurs in the main arc voltage average value Vav (Δt) at each detection interval. Therefore, the abnormality may be displayed or the operation of the welding power supply may be stopped. it can.

[0235] The method of claim 13 is characterized in that the welding current of the constant current output characteristic measured after the main arc current / voltage detection start time t3 as the welding current average value Iav during the detection period of claims 4 to 11 is determined. The main arc current measurement output from the power supply is employed.

When the output characteristics of the welding power supply device are constant current characteristics, the output current is maintained substantially constant. Therefore, in the method according to the thirteenth aspect, it is not necessary to measure the main arc current average value Iav (Δt) for each detection interval Δt, and the welding current average value Iav during the detection period after the main arc is stabilized.
Is required to be measured at least once, so that the circuit is simplified.

[0240] The method of claim 14 is characterized in that the detection interval calculated from the main arc current / voltage detection start time t3 at every detection interval Δt as the welding current average value Iav during the detection period of claims 4 to 11. Main arc current average value Iav
(Δt) is adopted.

In the method according to the fourteenth aspect, even if the output characteristic of the welding power supply device is not a constant current characteristic, the main arc current average value Iav for each detection interval is detected for each detection interval Δt.
(Δt) and main arc voltage average value Vav (Δt) for each detection interval
Is measured and the main arc period integrated heat input Qta3n is calculated, so that a large-capacity stud that requires a large current by using a small-capacity power supply that supplies a small-capacity welding power supply such as an engine generator For example, when welding is performed, even when the output voltage and output current of the welding power supply decrease due to lack of input power of the welding power supply, a good welding result can be obtained.

According to a fifteenth aspect of the present invention, the auxiliary arc current set value set in the welding power supply device having a constant current output characteristic is used as the auxiliary arc current value Ip according to the seventh, eighth or ninth aspect. Has adopted.

When the output characteristic of the welding power supply is a constant current characteristic, the auxiliary arc current value Ip of the value set in the welding power supply flows unless a failure occurs in the welding power supply. Therefore, the method of claim 15 is the method of claim 7 or claim 8.
Alternatively, in the method according to the ninth aspect, similarly to the method according to the twelfth aspect, only the auxiliary arc voltage average value Vav12 needs to be measured by connecting a signal detection lead wire, so that the auxiliary arc current value Ip No welding current detector for measuring the temperature is required. If a failure occurs in the welding power supply, the main alarm at each detection interval
Since an abnormality occurs in the peak voltage average value Vav (Δt), the abnormality can be displayed or the operation of the welding power supply device can be stopped.

The method of claim 16 is characterized in that the auxiliary arc current value Ip according to claim 7 or claim 8 or claim 9 is a constant current output characteristic measured from the auxiliary arc current / voltage detection start time t1. Auxiliary arc current measurement output from the welding power supply is adopted.

When the output characteristics of the welding power supply device are constant current characteristics, the output current is maintained substantially constant. Therefore, the method of claim 16 is the method of claim 7 or claim 8 or claim 9
Similarly to the method of the thirteenth aspect, there is no need to measure the auxiliary arc current average value Iav (Δt) for each detection interval Δt, and the auxiliary arc current value after the auxiliary arc is stabilized. Since Ip needs to be measured at least once, the circuit is simplified.

[Explanation of FIG. 7] FIG. 7 is a diagram showing an embodiment of a stud welding apparatus for implementing the method of the present invention by digital control.

The stud welding apparatus shown in the figure is composed of a welding power supply device 1, a welding gun 2, and a welding control device 3. This welding power supply device 1 supplies an auxiliary arc current Ip to a welding gun 2.
And a main arc current Ia. A current command output circuit 5 for controlling an output current Io in accordance with an analog signal output from a welding control device 3 described later, based on the current command. Current output circuit 1 comprising a semiconductor switching element such as a thyristor for controlling a welding current by welding
5, a welding current detection circuit IC that detects an output current Io output to the stud 18 through the secondary cable 17 and outputs a welding current detection signal Ic, and a welding voltage detection by detecting an output terminal voltage value Vd. And a welding voltage detection circuit VC that outputs a signal Vc.

The welding control device 3 outputs the welding current detection signal Ic
Is converted to a digital welding current detection signal Idd and output to the arithmetic processing circuit CPU. / D conversion circuit 8,
An arithmetic processing circuit CPU for receiving the digital welding current detection signal Idd and the digital welding voltage detection signal Vdd and outputting a digital output signal to be described later;
D / A conversion circuit 6 for converting the digital output signal Iod to the analog output signal Ioa and outputting it to the current command output circuit 5
And a storage circuit 11 for storing data such as detected values, calculated values, welding results, and the like, and a display circuit 12 such as a digital panel for displaying these. This D / A conversion circuit 6, A /
The D conversion circuit 7 and the A / D conversion circuit 8 are composed of an arithmetic processing circuit CP.
It may be built in U.

[Explanation of FIG. 8] FIG. 8 is a diagram showing an embodiment of a stud welding apparatus for performing the method of the present invention by analog control.

Also, in the embodiment of FIG. 8, the current and voltage detection signals can be converted into an integrator, a multiplier and a divider without using a complicated circuit using a microcomputer as in the embodiment of FIG. The average heat input can be calculated and displayed by using an arithmetic circuit configured by an analog circuit. Further, when the value deviates from an allowable range as compared with a standard value (composed of an analog circuit), an alarm is issued by an abnormal lamp, a buzzer, or the like.

First, when the start switch 13 is pressed, an auxiliary arc current set in advance in the welding sequence control circuit 21 is output from the welding current output circuit 15, and the stud 18 is pulled up, so that the auxiliary arc is output. Is generated and the welding
After the elapse of the pilot time preset in the cans control circuit 21, the operation shifts to the main arc current. When shifting from the auxiliary arc current to the welding current, a reset signal is output from the measurement time setting circuit 28, and the smoothing circuit 22, the smoothing circuit 23
Is reset, and the time integration of the welding current and the welding voltage newly detected by the welding current detection circuit IC and the welding voltage detection circuit VC is newly started. The reset signal may be synchronized with the start of the output of the auxiliary arc current.

Next, after the elapse of the welding time preset in the welding sequence control circuit 21, the stud 18 is pushed in by the welding gun 2. The measurement time setting circuit 28 detects the start of the pushing operation, and outputs a hold signal to the smoothing circuits 22 and 23. With this hold signal, the value integrated from the reset signal is held in the smoothing circuits 22 and 23. Since the held values are time-integrated values, they are multiplied by the multiplication circuit 24, and the welding time (analog value) set in advance by the welding sequence control circuit 21 using the division circuit 29. , The average heat input amount is calculated and displayed on the display circuit 12. Further, the calculated average heat input is compared with a standard value of the average heat input preset in the standard heat input setting circuit 25 by the comparison circuit 26,
If it exceeds the allowable range, an alarm is issued by the alarm 27.

[1000]

The common effects of the present invention are as follows. The method of the present invention compares the accumulated heat input Qta with the standard heat input Qst for the entire detection period each time it is detected, and determines the time tn when the accumulated heat input Qta reaches the standard heat input Qst for the entire detection period.
, The pressing step is started, so that even if a short circuit occurs, an appropriate amount of heat input can be secured, and good welding quality can be obtained. In addition, the present invention obtains good welding quality, stores data obtained for each stud welding for each stud welding, and stores this data in the arithmetic processing unit 4 or an external storage device (for example, a memory). By outputting the data to a personal computer or the like directly from a card, a floppy disk or the like), the welding quality of the welding work of each stud can be easily confirmed on the personal computer or the like. In addition, data obtained for each welding of each stud is totalized and statistical processing or the like is performed to control welding quality.

[1004] The method according to claim 4 to claim 6, wherein the main arc voltage average value Vav (Δt) for each detection interval, the main arc voltage average value Vav3n for the entire detection period, or the main arc period calculated from this voltage value. When the accumulated heat input Qta3n reaches the standard heat input Qst38 for the entire main arc period or the standard arc voltage standard value Vst38 for the entire detection period calculated from the heat input, the pushing process starts at the time tn. Also, an appropriate heat input can be secured, and good welding quality can be obtained.

The method of claim 7 to claim 9 is the method of claim 4
In addition to the effects of the above-described respective methods, an auxiliary arc current / voltage detection start time t1 of the auxiliary arc period Tp is added.
Since the auxiliary arc current value Ip is measured from the above, the auxiliary arc voltage average value Vav12 is measured to calculate the auxiliary arc period accumulated heat input Qta12, so that the accuracy of the heat input measurement is improved.

[1010] In addition to the effects of the respective methods of the fourth to ninth aspects, the method of the tenth aspect has a number [ mSec], the average value of heat input ΔQav for each detection interval calculated for each detection interval Δt is the standard value of heat input for each detection interval Δ
The number of short circuits Ns that is lower than Qst is counted, and when the number of short circuits Ns is equal to or more than the preset standard number of allowable heat input short circuits Nst, an effect of displaying welding failure is provided.

According to the method of claim 11, in addition to the effects of each of the methods of claims 4 to 9, the number of short circuits Ns counted in the same manner as in claim 10 is equal to the preset standard number of allowable heat input short circuits Nst As described above, by adding the energizing time of the main arc current Ia by a preset time, there is an effect of preventing poor welding.

[1012] According to a twelfth aspect of the present invention, the main arc voltage average value Vav for each detection interval is connected by connecting a signal detection lead wire.
Since only (Δt) needs to be measured, there is no need for a welding current detector for measuring the welding current average value Iav during the detection period of the large current. When a failure occurs in the welding power supply, an abnormality occurs in the main arc voltage average value Vav (Δt) at each detection interval. Therefore, the abnormality may be displayed or the operation of the welding power supply may be stopped. it can.

In the method according to the thirteenth aspect, it is not necessary to measure the main arc current average value Iav (Δt) for each detection interval Δt, and the welding current average value during the detection period after the main arc is stabilized. Since Iav needs to be measured at least once,
The circuit becomes simple.

[1014] The method according to claim 14, wherein even if the output characteristic of the welding power supply device is not a constant current characteristic, the detection interval Δt
And the main arc current average value Iav (Δt) for each detection interval.
By measuring the main arc voltage average value Vav (Δt) at each detection interval to calculate the main arc period integrated heat input Qta3n, the capacity supplied to the welding power supply such as a small-capacity engine generator is small. When welding large diameter studs that require a large current using a power supply device, good welding results can be obtained even when the output voltage and output current of the welding power supply decrease due to insufficient input power of the welding power supply. Obtainable.

The method of claim 15 is the same as the method of claim 7, 8 or 9, except that a signal detection lead wire is connected to the auxiliary arc voltage averaging circuit as in the method of claim 12. Since only the value Vav12 needs to be measured, there is no need for a welding current detector for measuring the auxiliary arc current value Ip. When a failure occurs in the welding power supply, an abnormality occurs in the main arc voltage average value Vav (Δt) at each detection interval. Therefore, the abnormality may be displayed or the operation of the welding power supply may be stopped. it can.

The method of claim 16 is the same as the method of claim 13 in the method of claim 7 or claim 8 or claim 9, wherein the auxiliary arc current average value Iav ( It is not necessary to measure Δt), and the auxiliary arc current value Ip may be measured at least once after the auxiliary arc is stabilized, so that the circuit is simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram of a stud welding apparatus implementing a conventional method for monitoring welding voltage, welding current and main arc current period.

FIG. 2A is a graph showing a relationship between an output current Io during the main arc period during normal welding and a welding current average value Iav during the detection period;
FIG. 8B is a diagram illustrating the detection interval Δ from the output terminal voltage Vd during the entire main arc period during normal welding.
Main arc voltage average value Vav (Δt) for each detection interval at every t
(C) is a diagram showing the stud pull-up distance during normal welding.

FIG. 3A is an explanatory diagram of calculating a welding current average value Iav during a detection period from an output current Io of the entire main arc period during each welding, and FIG. FIG. 9 is an explanatory diagram for calculating a main arc voltage average value Vav (Δt) for each detection interval Δt from the output terminal voltage Vd during the entire main arc period.

FIG. 4 (A) is a graph showing the main arc current average value I for each detection interval from the output current Io for the entire main arc period during each welding.
FIG. 6B is a diagram for explaining the calculation of av (Δt). FIG. 6B shows the main arc voltage average value Vav for each detection interval from the output terminal voltage Vd during the entire main arc period during each welding.
FIG. 9 is an explanatory diagram for calculating (Δt).

FIG. 5 is a diagram showing a welding voltage waveform and a welding current waveform when the stud 18 is temporarily short-circuited to the molten pool during a main arc period Ta due to poor pulling, partial melting due to an abnormal arc phenomenon, or the like. FIG.

FIG. 6A is a welding current waveform diagram showing a waveform of an output current Io when a micro short circuit occurs during a main arc period Ta, and FIG. 6B is a diagram showing a welding current waveform during a main arc period Ta; FIG. 5 is a diagram showing a waveform of an output terminal voltage Vd when a short circuit occurs in FIG.

FIG. 7 is a diagram showing an embodiment of a stud welding apparatus for performing the method of the present invention by digital control.

FIG. 8 is a diagram showing an embodiment of a stud welding apparatus for performing the method of the present invention by analog control.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 welding power supply device 2 welding gun 3 welding control device 4 arithmetic processing circuit 5 current command output circuit 6 D / A conversion circuit 7 and 8 A / D conversion circuit 11 storage circuit 12 display circuit 13 ... Starting switch 14 ... Welded material 15 ... Welding current output circuit 16 ... Control cable 17 ... Secondary cable 18 ... Stud 20 ... Heat input operation circuit 21 ... Welding sequence control circuit 22, 23 ... Smoothing circuit 24 ... Multiplication circuit 25 ... Standard heat input setting circuit 26 ... Comparison circuit 27 ... Alarm 28 ... Measurement time setting circuit 29 ... Division circuit 30 ... Three-phase power supply 36,44 ... Filter circuit 37,45 ... Amplification circuit 39 ... Reference welding voltage setting circuit 40 ... Comparator 41 ... Alarm 42,43 ... Connection line CPU ... Calculation processing circuit I1 (t) ... Welding current value at time t Ia ... Main arc current / Main arc current value IC ... Welding current detection circuit c: welding current detection signal Io: output current / output current value Ip: auxiliary arc current / auxiliary arc current value Is: short-circuit current Ias (Δt): average output current value when a short-circuit occurs at each detection interval Iav ... Average welding current value during detection period Iav (Δt) ... Average value of main arc current at each detection interval Ita3n ... Integrated current value of main arc period Ns ... Number of short circuits Nst ... Number of allowable standard heat input short circuits n ... (Detection interval Δt) Number of detections Qr: required heat input Qst: standard heat input during the entire detection period Qta: integrated heat input Qta12: integrated heat input during the auxiliary arc period Qst18: (preset) auxiliary / main arc detection period Standard heat input Qst38: Standard heat input for the entire main arc period (pre-set) Qta1n: Auxiliary / main arc period integrated heat input Qta3n: Main arc period integrated heat input ΔQas: Average heat input when a short circuit occurs at each detection interval ΔQav: For each detection interval Heat value average value ΔQst: Heat input standard value for each detection interval T12: Auxiliary arc detection period T38: Main arc heat input standard value setting period T3n: Main arc integrated value detection period t0: Starting point of energizing auxiliary arc current t1 ... Auxiliary arc current / voltage detection start time t2 ... Main arc current energization start time t3 ... Main arc current / voltage detection start time t8 ... Main arc current / voltage detection end time t9 ... Main arc End time of arc current energization / Start time of short-circuit current energization t10 ... End time of output current energization / End time of short-circuit current energization t01 to t0n ... Detection start time of each detection interval Δt Ta ... Main arc period Tp ... Auxiliary arc period Ts ... Short circuit period tn: When the accumulated heat input Qta reaches the standard heat input Qst for the entire preset detection period or when the main arc period accumulated voltage value Vta3n reaches the preset main arc voltage standard value Vst38 for the entire detection period. Δt: detection interval Δt = 1 to Δt = n: first to Nth detections Δt · n: main arc detection period V1 (t): welding voltage value at time t Vav: welding voltage average value during the detection period Vav12 ... Auxiliary arc voltage average value Vas (Δt): average output terminal voltage value at occurrence of short circuit at each detection interval Vav (Δt): main arc voltage average value at each detection interval VC: welding voltage detection circuit Vc: welding Voltage detection signal Vd: output terminal voltage / output terminal voltage value Ve: appropriate welding voltage average value Vst38: main arc voltage standard value for the entire detection period Vav3n: main arc voltage average value for the entire detection period Vta3n: main arc period integrated voltage value ΔVe: allowable value of proper welding voltage range

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Harada 1-1-29 Minamimori-cho, Kita-ku, Osaka Inside Daihen Stud Co., Ltd.

Claims (16)

[Claims] 1. A stud welding method in which an arc is generated by lifting a stud from a material to be welded, and then the stud is welded by pushing the stud into the material to be welded by a predetermined amount.
When the integrated heat input amount of the main arc period calculated from the average value of the main arc voltage at each detection interval reaches the standard heat input amount of the entire main arc period, the press-in process starts when the integrated heat input of stud welding is started. Control method. 2. A stud welding method wherein an arc is generated by pulling up a stud from a material to be welded, and then the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
A method for controlling the integrated heat input and press-in of stud welding, in which the indentation process is started when the integrated voltage value of the main arc period reaches the standard value of the main arc voltage for the entire detection period calculated from the standard heat input for the entire main arc period set in advance. . 3. In stud welding in which an arc is generated by lifting a stud from a material to be welded and then pushing the stud into the material to be welded by a predetermined pushing amount, the stud welding is calculated from an average value of a main arc voltage in the entire detection period. A method for controlling cumulative heat input and press-in of stud welding, in which the press-in process is started when the cumulative heat input of the main arc period reaches a preset standard heat input for the entire main arc period. 4. A stud welding method in which after a stud is pulled up from a material to be welded and an arc is generated, the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
The standard heat input for the entire main arc period during normal welding is set in advance, the auxiliary arc current is switched to the main arc current, and from the start of the main arc current / voltage detection, at each detection interval, Measure the main arc voltage average value at each detection interval,
The average heat input for each detection interval is integrated by calculating the product of the average value of the main arc voltage for each detection interval and the average value of the welding current during the detection period to calculate the integrated heat input for the main arc period. A stud welding integrated heat input press-in control method for starting a press-in process when the integrated heat input during the period reaches the standard heat input during the preset main arc period. 5. A stud welding method in which, after an arc is generated by pulling up a stud from a material to be welded, the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
Before starting welding, the standard heat input for the entire main arc period during normal welding is set in advance, and the main arc current is calculated from the auxiliary arc current.
The main arc voltage average value at each detection interval is measured at each detection interval from the start of main arc current / voltage detection, and the main arc voltage average value at each detection interval is integrated. The main arc period integrated voltage value is calculated, and the main arc period integrated voltage value is calculated by dividing the preset standard heat input amount of the entire main arc period by the welding current average value during the detection period. A method of controlling the cumulative heat input press-in of stud welding, which starts the press-in process when the arc voltage standard value is reached. 6. A stud welding method in which an arc is generated by pulling up a stud from a material to be welded, and then the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
Before starting welding, the standard heat input for the entire main arc period during normal welding is set in advance, and the main arc current is calculated from the auxiliary arc current.
The main arc voltage average value at each detection interval is measured at each detection interval from the start of main arc current / voltage detection, and the main arc voltage average value at each detection interval is integrated. Calculate the main arc period integrated voltage value, calculate the main arc voltage average value of the entire detection period by dividing the main arc period integrated voltage value by the number of detections, and calculate the main arc voltage average value of the entire detection period. The main arc period integrated heat input of the product of the welding current average value and the main arc integrated value detection period during the detection period is calculated, and the main arc period integrated heat input is the standard heat input over the entire main arc period set in advance. A method of controlling the total heat input and press-in of stud welding, which starts the press-in process when it reaches. 7. A stud welding method in which an arc is generated by pulling up a stud from a material to be welded, and then the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
Prior to the start of welding, the standard heat input for the auxiliary arc period and the auxiliary / main arc detection period during normal welding is set in advance.
The average voltage of the auxiliary arc is measured, and the integrated heat input of the auxiliary arc period is calculated by multiplying the average value of the auxiliary arc voltage, the auxiliary arc current value, and the auxiliary arc detection period. The main arc current is switched from the arc current to the main arc current. From the start of the main arc current / voltage detection, the main arc voltage average value at each detection interval is measured at each detection interval. The average heat input value for each detection interval of the product of the arc voltage average value and the welding current average value during the detection period is integrated up to the number of times of detection to calculate the integrated heat input amount in the main arc period, and the auxiliary arc is calculated. The pushing process is started when the auxiliary / main arc period integrated heat input amount of the sum of the period integrated heat input amount and the main arc period integrated heat input amount reaches the standard heat input amount of the preset auxiliary / main arc detection period as a whole. A method of controlling the cumulative heat input of stud welding. 8. A stud welding method in which an arc is generated by pulling up a stud from a material to be welded, and then the stud is pushed into the material to be welded by a predetermined pushing amount to perform welding.
Before the start of welding, the standard heat input for the auxiliary arc period and the auxiliary / main arc detection period during normal welding is set in advance, and the auxiliary arc current / voltage detection start time is set to the auxiliary arc.
The average of the auxiliary voltage during the auxiliary arc period is calculated by measuring the average of the auxiliary voltage and the product of the average of the auxiliary arc voltage, the auxiliary arc current value and the auxiliary arc detection period. Assistance
The accumulated heat input of the main arc period is calculated by subtracting the accumulated heat input of the auxiliary arc period from the standard heat input of the entire main arc detection period, and then the auxiliary arc current is converted to the main arc current. Switch, and from the start of main arc current / voltage detection, measure the main arc voltage average value for each detection interval for each detection interval,
The main arc period integrated voltage value is calculated by integrating the main arc voltage average value for each of the detection intervals, and the main arc period integrated voltage value is used as the welding current average during the detection period of the main arc period integrated heat input. A method for controlling the integrated heat input and press-in of stud welding, in which the press-in process is started when the main arc voltage standard value of the entire detection period divided by the value is reached. 9. A stud welding method in which a stud is pulled up from a material to be welded to generate an arc, and then the stud is pushed into the material to be welded by a predetermined amount to be welded.
Before the start of welding, the standard heat input for the auxiliary arc period and the auxiliary / main arc detection period during normal welding is set in advance, and the auxiliary arc current / voltage detection start time is set to the auxiliary arc.
The average voltage of the auxiliary arc is measured, and the integrated heat input of the auxiliary arc period is calculated by multiplying the average value of the auxiliary arc voltage, the auxiliary arc current value, and the auxiliary arc detection period. The main arc current is switched from the arc current to the main arc current. From the start of the main arc current / voltage detection, the main arc voltage average value at each detection interval is measured at each detection interval. The main arc period integrated voltage value is calculated by integrating the arc voltage average value, and the main arc period integrated voltage value is divided by the number of detections to calculate a main arc voltage average value for the entire detection period. The main arc period integrated heat input amount of the product of the overall main arc voltage average value, the welding current average value during the detection period, and the main arc integrated value detection period is calculated, and the auxiliary arc period integrated heat input amount and the main arc period integration are calculated. The sum of the heat input and the auxiliary heat input during the main arc period is Heat input integration push controlling method of stud welding starting the process pushing Once at the standard heat input across the auxiliary-main arc detection period. 10. The method according to claim 4 or claim 5, claim 6, claim 6, claim 7, claim 8, or claim 9,
Before the start of welding, the standard value of the heat input amount and the standard value of the entire main arc period for each detection interval shorter than the single occurrence time of a micro short-circuit that may become a defect of the weld and the detection interval when the short-circuit does not occur The standard allowable number of heat input short circuits to secure the heat input is set in advance, and from the start of main arc current / voltage detection, the average value of the main arc voltage at each detection interval is measured at each detection interval and detected. The average heat input amount at each detection interval is calculated as the product of the main arc voltage average value at each interval and the welding current average value during the detection period, and the average heat input amount at each detection interval is calculated at each detection interval. A heat input cumulative push-in control method for stud welding, in which the number of short circuits falling below a standard calorie value is counted, and if the number of short circuits becomes equal to or greater than the preset standard heat input allowable short circuit frequency, welding failure is displayed. 11. The method according to claim 4 or claim 5, claim 6, claim 6, claim 7, claim 8, or claim 9,
Prior to the start of welding, the standard value of heat input and the main arc period for each appropriate detection interval that are shorter than the single occurrence time of a micro short-circuit that may become a defect in the weld and that no short-circuit occurs The standard number of allowable heat input short-circuits to secure the entire standard heat input is set in advance, and the main arc voltage average value for each detection interval is measured for each detection interval from the start of main arc current / voltage detection. The average heat input amount at each detection interval is calculated by multiplying the average value of the main arc voltage at each detection interval by the average welding current value during the detection period. The number of short-circuits that have fallen below the standard heat input amount for each is counted, and when the number of short-circuits is equal to or greater than the preset standard number of allowable heat input short-circuits, the energizing time of the main arc current is further added for a preset time. Heat input integration of stud welding And included a control method. 12. The welding current average value during the detection period of claim 4, claim 5, claim 6, claim 6, claim 7, claim 8, claim 9, claim 10, or claim 11 is a constant current output. A method for controlling the integrated heat input and press-in of stud welding, which is a main arc current set value set in a welding power supply device having characteristics. 13. The welding current average value during the detection period of claim 4, claim 5, claim 6, claim 6, claim 7, claim 8, claim 9, claim 10, or claim 11 is the main arc current. A method for controlling the cumulative heat input and press-in of stud welding, which is the main arc current measurement value output from the welding power supply unit having a constant current output characteristic measured after the voltage detection start time. 14. The average value of the welding current during the detection period of claim 4, claim 5, claim 6, claim 6, claim 7, claim 8, claim 9, claim 10, or claim 11 is the main arc current. A stud welding heat input integrated press-in control method which is a value calculated by integrating the average value of the main arc current for each detection interval calculated for each detection interval from the start of voltage detection. 15. The heat input of stud welding, wherein the auxiliary arc current value according to claim 7, 8 or 9 is a set auxiliary arc current value set in a welding power supply device having a constant current output characteristic. Integral push control method. 16. An auxiliary arc output from a welding power supply having a constant current output characteristic, wherein the auxiliary arc current value is measured from the start of the auxiliary arc current / voltage detection. A method for controlling the cumulative heat input indentation of stud welding, which is the measured current value.