WO2020050011A1 - スポット溶接方法 - Google Patents
スポット溶接方法 Download PDFInfo
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- WO2020050011A1 WO2020050011A1 PCT/JP2019/032471 JP2019032471W WO2020050011A1 WO 2020050011 A1 WO2020050011 A1 WO 2020050011A1 JP 2019032471 W JP2019032471 W JP 2019032471W WO 2020050011 A1 WO2020050011 A1 WO 2020050011A1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/257—Monitoring devices using digital means the measured parameter being an electrical current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
Definitions
- the present invention relates to a spot welding method.
- spot welding using a spot welding device is performed.
- spot welding when a plurality of metal plates are sandwiched between a pair of electrode tips, a current is applied between the pair of electrode tips to generate a nugget between the plurality of metal plates and weld the plurality of metal plates. .
- a plurality of metal plates are welded by applying a plurality of DC micropulses to the plurality of metal plates in a state where the plurality of metal plates are sandwiched between a pair of electrodes.
- the nugget In spot welding, if the current supply time between the pair of electrode tips is short, the nugget may not grow to the size required for welding and welding may not be possible. On the other hand, if the energization time between the pair of electrode tips is lengthened, the nugget grows too much and protrudes from the corona bond formed between the plurality of metal plates (unmelted pressure-bonded portion formed outside the nugget). As a result, the nugget may be exposed and spatter may occur. Under such circumstances, in spot welding, reliable welding is required while suppressing generation of spatter.
- the contact resistance between the thick plate and the thick plate is larger than the contact resistance between the thin plate and the thick plate, the nugget formed between the thick plate and the thick plate is different from the nugget formed between the thin plate and the thick plate. Grow faster compared to. For this reason, if energization is continued until the nugget between the thin plate and the thick plate is sufficiently grown, the nugget between the thick plate and the thick plate may grow too much and spatter may occur.
- An object of the present invention is to provide a spot welding method capable of securely joining works while suppressing generation of spatter.
- the spot welding method according to the present invention is a method for joining a work (for example, a work W described later) by supplying a welding current, and the welding current reaches within a set peak current range. Or a pulsed waveform in which a maintained peak state and a non-peak state after falling from the peak current range to the bottom current and then rising again to the peak current range are alternately realized, In the non-peak state, current control for increasing the welding current toward the peak current range when the effective value (Irms) of the welding current reaches a predetermined target range (for example, an effective value target range described later). Is started.
- a predetermined target range for example, an effective value target range described later
- the work is a laminate formed by stacking three or more metal plates (for example, metal plates W1, W2, and W3 described later), and at least one of the three or more metal plates is used.
- the metal plate is preferably formed so as to have a different thickness from other metal plates.
- the workpieces are joined by supplying a welding current having a pulse-like waveform realized alternately.
- the current control for increasing the welding current toward the peak current range is started. In other words, in the present invention, the start of the current control for the next cycle is waited until the effective value of the welding current reaches the target range.
- a work is a laminate formed by stacking three or more metal plates, at least one of which has a different thickness from the other.
- the contact resistance between the thick plate and the thick plate is larger than that between the thin plate and the thick plate, and the growth of the nugget is faster, but the heat removal between the thick plate and the thick plate is larger than that between the thin plate and the thick plate. Therefore, in the present invention, such a laminated body of metal plates is used as a work, and in a non-peak state, the start of current control is waited until the effective value of the welding current reaches a target range, so that the thickness between the thin plate and the thick plate and the thickness are reduced.
- the thickness between the thick plate and the thick plate is controlled so as to suppress the generation of spatter between the thick plate and the thick plate.
- the time for cooling the nugget can be secured.
- FIG. 4 is a diagram showing a relationship between an AC voltage input to a transformer from an inverter circuit and a welding current applied to an electrode tip pair in a welding power supply circuit. It is a figure which shows the cross section of the workpiece
- FIG. 6 is a diagram showing a state in which a welding current is applied to the work while the work is being sandwiched and pressed between the upper electrode tip and the lower electrode tip. It is a flowchart which shows the specific procedure of welding current control in a control apparatus.
- FIG. 6 is a diagram showing a waveform of a welding current realized by the welding current control of FIG. 5. It is a flowchart which shows the specific procedure of a current control process. It is a flowchart which shows the specific procedure of an effective value control process.
- FIG. 1 is a diagram showing a configuration of a welding system S to which a spot welding method according to the present embodiment is applied.
- the welding system S includes a spot welding device 1 as a welding gun, a work W as a laminate of metal plates joined by the spot welding device 1, and a robot 6 supporting the spot welding device 1.
- the work W is a laminate formed by stacking a plurality of metal plates.
- the work W is a laminate formed by stacking three metal plates, that is, a first metal plate W1, a second metal plate W2, and a third metal plate W3 in order from top to bottom.
- the case will be described, but the present invention is not limited to this.
- the number of metal plates constituting the work W may be two or four or more.
- the thickness of the first metal plate W1 is smaller than the thicknesses of the second metal plate W2 and the third metal plate W3 will be described, but the present invention is not limited to this.
- At least one of the metal plates W1 to W3 may have a different thickness from the other metal plates.
- the robot 6 includes a robot main body 60 attached to the floor, an articulated arm 61 pivotally supported by the robot main body 60, and a robot control device 62 for controlling the robot 6.
- the articulated arm 61 has a first arm portion 611 whose base end is pivotally supported by the robot body 60, a second arm portion 612 whose base end is pivotally supported by the first arm portion 611, and a base end side thereof.
- a third arm portion 613 pivotally supported by the second arm portion 612, a fourth arm portion 614 having a base end side pivotally supported by the third arm portion 613 and having the spot welding device 1 attached to a distal end side thereof. , Is provided.
- the robot controller 62 drives each of the arm units 611 to 614 by driving a plurality of motors provided on the robot main body 60 and the articulated arm 61, and drives the spot welding apparatus 1 attached to the fourth arm unit 614. , And the electrode tips 21 and 26 provided in the spot welding apparatus 1 described below are moved to the joint of the workpiece W.
- the spot welding apparatus 1 includes a welding power supply circuit 3 serving as a welding current supply source, a gun main body 2 on which a part of an upper electrode tip moving mechanism 4 and a welding power supply circuit 3 described later are mounted, and a pair of electrodes. It includes an electrode chip 21 and a lower electrode chip 26, an upper electrode chip support 22, an upper adapter body 23, a gun arm 25, a lower electrode chip support 27, and a lower adapter body 28.
- the upper electrode chip supporting portion 22 has a rod shape extending in the vertical direction, and the upper electrode chip 21 is attached to the tip thereof.
- the upper adapter main body 23 has a columnar shape and connects the gun main body 2 and the upper electrode chip supporting portion 22.
- the upper adapter main body 23 is provided slidably with respect to the gun main body 2 along a sliding direction parallel to the axis of the upper electrode chip support 22.
- the gun arm 25 extends from the gun body 2 to the lower side in the vertical direction of the upper electrode tip 21 in a curved manner.
- the lower electrode chip support portion 27 has a rod shape coaxial with the upper electrode chip support portion 22, and the lower electrode chip 26 is attached to a tip portion thereof.
- the lower adapter main body 28 has a columnar shape, and connects the distal end of the gun arm 25 to the lower electrode chip support 27. As shown in FIG. 1, the lower electrode chip 26 is supported by the lower electrode chip support 27 so as to face the upper electrode chip 21 at a predetermined interval along the axis of the chip supports 22 and 27. Have been.
- the upper electrode tip moving mechanism 4 includes a cylinder and its control device, and moves the upper adapter body 23 along with the upper electrode chip support portion 22 and the upper electrode chip 21 in the sliding direction. Thereby, the upper electrode chip 21 is brought into contact with the upper surface of the work W in a state where the lower electrode chip 26 is brought into contact with the lower surface of the work W, or the work W is sandwiched between the electrode chips 21 and 26 to be added. You can also press.
- FIG. 2 is a diagram showing a circuit configuration of the welding power supply circuit 3.
- the welding power supply circuit 3 includes a welding control circuit 3a, a DC welding transformer 3b, a power supply cable 3c, and a current sensor 3d.
- the welding power supply circuit 3 is connected to the upper electrode chip 21 and the lower electrode chip 26 via power lines L1 and L2.
- the DC welding transformer 3 b and the current sensor 3 d of the welding power supply circuit 3 configured as described above are mounted on the gun body 2.
- the welding control circuit 3a of the welding power supply circuit 3 is mounted on a base separate from the gun body 2, and is connected to the DC welding transformer 3b via a power cable 3c. As a result, the weight of the gun body 2 can be reduced.
- the welding control circuit 3a includes a converter circuit 31, an inverter circuit 32, and a control device 33.
- the DC welding transformer 3b includes a transformer 34 and a rectifier circuit 35.
- the converter circuit 31 converts the three-phase power input from the three-phase power supply 30 into DC power by performing full-wave rectification, and supplies the DC power to the inverter circuit 32.
- the inverter circuit 32 converts DC power input from the converter circuit 32 into single-phase AC power, and outputs it to the transformer 34 via the power cable 3c. More specifically, the inverter circuit 32 includes four bridge-connected switching elements. The inverter circuit 32 converts DC power into single-phase AC power by turning on or off these switching elements according to a gate drive signal transmitted from a gate drive circuit mounted on the control device 33.
- the transformer 34 transforms the AC power input from the inverter circuit 32 and outputs it to the rectifier circuit 35.
- Rectifier circuit 35 rectifies AC power input from transformer 34 and outputs DC power between electrode chips 21 and 26 connected to power lines L1 and L2, respectively.
- the rectifier circuit 35 for example, a known full-wave rectifier circuit configured by combining two rectifier diodes 351 and 352 and a center tap 353 is used.
- the current sensor 3d detects a welding current supplied from the welding power supply circuit 3 to the chips 21 and 26.
- the current sensor 3d is provided on, for example, a power line L1 that connects the rectifier circuit 35 and the upper electrode chip 21, and transmits a current detection signal corresponding to the magnitude of a welding current flowing through the power line L1 to the control device 33.
- the control device 33 uses a current detection signal transmitted from the current sensor 3d to execute a welding current control, which will be described later, and generates a gate drive signal in accordance with the operation result of the microcomputer and transmits the gate drive signal to the inverter circuit 32. And a gate drive circuit.
- FIG. 3 is a diagram showing the relationship between the AC voltage Vt input from the inverter circuit 32 to the transformer 34 and the welding current Iw applied to the electrode tips 21 and 26 in the welding power supply circuit 3 described above.
- the inverter circuit 32 When the inverter circuit 32 is driven, the inverter circuit 32 outputs a rectangular-wave AC voltage Vt as shown in FIG.
- the AC voltage output from the inverter circuit 32 is transformed in the transformer 34 and rectified in the rectifier circuit 35, and the DC welding current Iw is applied to the work W via the electrode tips 21 and 26.
- the welding current Iw increases as the duty ratio, which is the ratio of the pulse width PW, which is the period during which the AC voltage Vt becomes Hi or Lo, to the predetermined carrier cycle T, increases.
- the control device 33 performs PI control or the like such that the output current of the welding power supply circuit 3 detected by the current sensor 3d becomes a target current determined by a process (not shown).
- the pulse width PW is determined in accordance with the known feedback control law, and a plurality of switching elements in the inverter circuit 32 are turned on / off by PWM control under a duty ratio determined by the pulse width PW.
- the robot control device 62 drives the robot main body 60 and the articulated arm 61 so that the workpiece W is arranged between the upper electrode chip 21 and the lower electrode chip 26. , The position and attitude of the spot welding apparatus 1 are controlled. At this time, the robot control device 62 controls the position and the posture of the spot welding device 1 such that the lower electrode tip 26 comes into contact with the lower surface of the third metal plate W3 of the work W.
- the upper adapter main body 23 is slid by using the upper electrode tip moving mechanism 4 so that the upper electrode tip 21 approaches the lower electrode tip 26.
- the upper electrode chip 21 approaches the lower electrode chip 26 and comes into contact with the upper surface of the first metal plate W1
- the work W is sandwiched and pressed by the upper electrode chip 21 and the lower electrode chip 26.
- the control device 33 of the welding power supply circuit 3 executes the welding current control according to the procedure described with reference to FIG. 5 while maintaining the state where the work W is pressed from both sides by the electrode tips 21 and 26, A pulsed welding current flows between the upper electrode tip 21 and the lower electrode tip 26.
- the first nugget N1 is formed between the first metal plate W1 and the second metal plate W2
- the second nugget N1 is formed between the second metal plate W2 and the third metal plate W3.
- a nugget N2 is formed, and the first to third metal plates W1 to W3 are welded.
- FIG. 5 is a flowchart showing a specific procedure of welding current control in the control device 33.
- FIG. 6 is a diagram showing a waveform of a welding current realized by the welding current control of FIG.
- the welding current generated by performing the welding current control of FIG. 5 includes a peak state that reaches or is maintained within a set peak current range, and a bottom current (for example, , 0) and then a non-peak state alternately rising again toward the peak current range.
- the control device 33 executes a current control process, and proceeds to S2.
- the control device 33 increases the welding current from the bottom current toward the peak current range, and thereafter maintains the peak state for a predetermined time.
- the control device 33 determines whether or not a predetermined slope time has elapsed.
- the slope time is, as shown in FIG. 5, a current rise time, which is a time from when the welding current reaches the upper limit of the peak current range, to a welding current, and a time when the welding current is maintained within the peak current range. This time is a sum of a certain peak maintaining time and is set in advance.
- the control device 33 executes an effective value control process, and proceeds to S4.
- the control device 33 waits for the execution of the current control process for a waiting time (see FIG. 6) determined based on the effective value of the welding current. I do.
- the control device 33 determines whether or not the set energization time has elapsed since the start of the welding current control in FIG. The energization time corresponds to the time required for joining one point of the work W by the spot welding apparatus 1 and is set in advance. If the determination result in S4 is NO, the control device 33 returns to S1 and executes the current control process again. When the determination result of S4 is YES, the control device 33 ends the process of FIG. 5 to start the joining of the next point of the workpiece W.
- the control device 33 repeatedly executes the current control process (see S1) and the effective value control process (see S3) over the energizing time, so that the pulse shown in FIG. A welding current having a waveform is applied between the electrode tips 21 and 26.
- FIG. 7 is a flowchart illustrating a specific procedure of the current control process.
- the control device 33 acquires the current current value Ipv, which is the current value of the welding current, by using the current detection signal transmitted from the current sensor 3d, and proceeds to S12.
- the control device 33 sets the target current value Isp corresponding to the target value for the welding current, and proceeds to S13.
- the target current value Isp is set between predetermined current rising slopes or between the upper limit and the lower limit of the peak current range.
- the control device 33 calculates the effective value Irms of the welding current by using the current current value Ipv acquired in S11, and proceeds to S14. More specifically, the control device 33 calculates the square root of the root mean square value of the current current value Ipv over the time elapsed from the start of the welding current control of FIG. Is calculated.
- control device 33 calculates the current deviation Idev by subtracting the current current value Ipv acquired in S11 from the target current value Isp set in S12, and proceeds to S15.
- the control device 33 calculates the pulse width PW according to the feedback control law (specifically, for example, the PI control law) based on the current deviation Idev calculated in S14 so that the current deviation Idev becomes 0, and S16. Move on to More specifically, the control device 33 sums up a value obtained by multiplying the current deviation Idev by a predetermined proportional gain Kp and a value obtained by multiplying the integrated value of the current deviation Idev by a predetermined integration gain Ki to obtain a pulse. The width PW is calculated.
- the feedback control law specifically, for example, the PI control law
- the control device 33 starts the PW counter, and proceeds to S17.
- the control device 33 turns on the switching element provided in the inverter circuit 32, and proceeds to S18.
- the control device 33 determines whether or not the value of the PW counter has become 0, that is, whether or not the time corresponding to the pulse width PW has elapsed since the start of the PW counter in S16.
- the determination result in S18 is NO, the control device 33 returns to S17 and keeps the switching element ON, and when the determination result in S18 is YES, the control device 33 proceeds to S19.
- control device 33 turns off the switching element provided in the inverter circuit 32, and proceeds to S20.
- control device 33 determines whether or not the set carrier cycle has elapsed since the switching element was turned ON in S17. When the determination result of S20 is NO, the control device 33 returns to S19 and keeps the switching element OFF, and when the determination result of S20 is YES, the control device 33 proceeds to S2 in FIG.
- FIG. 8 is a flowchart illustrating a specific procedure of the effective value control process.
- the control device 33 starts a standby time counter to measure an energization standby time (see FIG. 6) corresponding to the execution time of the effective value control process, and proceeds to S32.
- the control device 33 acquires the current current value Ipv by using the current detection signal transmitted from the current sensor 3d, and proceeds to S33.
- the control device 33 calculates the effective value Irms of the welding current in the same procedure as in S13 by using the current current value Ipv acquired in S32, and proceeds to S34.
- the control device 33 determines whether or not the effective value Irms calculated in S33 has reached an effective value target range defined between a predetermined lower limit Itrg_min and a predetermined upper limit Itrg_max (Itrg_min ⁇ Irms). ⁇ Itrg_max). If the determination result in S34 is YES, the control device 33 starts the current control process in the next cycle, and proceeds to S4 in FIG. 5 to increase the welding current again toward the peak current range.
- the control device 33 proceeds to S35 and determines whether or not the value of the standby time counter started in S31 is 0, in other words, the power supply standby time exceeds the predetermined time. Is determined. If the determination result in S35 is NO, the control device 33 returns to S32, and waits for the start of the current control process in the next cycle until the effective value Irms decreases and reaches the effective value target range. If the determination result in S35 is YES, that is, if the effective value Irms has not reached the effective value target range within the predetermined time, the control device 33 proceeds to S36, and turns on a warning light, for example. Is notified to the operator that some abnormality has occurred, and the welding current control is terminated.
- the control device 33 repeatedly executes the current control process shown in FIG. 7 until a preset slope time elapses.
- the target current value Isp is set, and the PI control is performed so that the current current value Ipv obtained via the current sensor 3d becomes the target current value Isp.
- the pulse width PW To determine the pulse width PW, and drive the inverter circuit 32 by PWM control under the pulse width PW.
- the welding current increases from the bottom current toward the peak current range, and reaches the upper limit of the peak current range at time t2.
- the welding current is maintained within the peak current range by the PI control in the control device 33.
- the control device 33 ends the current control process (see S1) and executes the effective value control process. (Refer to S3).
- the welding current maintained within the peak current range is applied to the work W.
- the growth of nuggets N1 and N2 is promoted between the first metal plate W1 and the second metal plate W2 and between the second metal plate W2 and the third metal plate W3, respectively.
- the thickness of the first metal plate W1 is smaller than the thicknesses of the second metal plate W2 and the third metal plate W3. Therefore, the contact resistance between the first metal plate W1 and the second metal plate W2 is smaller than the contact resistance between the second metal plate W2 and the third metal plate W3.
- the Joule heat generated by the contact resistance due to the flow of the welding current is larger between the second metal plate W2 and the third metal plate W3 than between the first metal plate W1 and the second metal plate W2.
- the growth rate of the nugget N2 generated between the second metal plate W2 and the third metal plate W3 is equal to the growth speed of the nugget N1 generated between the first metal plate W1 and the second metal plate W2. Faster than speed.
- the control device 33 executes the effective value control process described with reference to FIG.
- the control device 33 calculates the effective value Irms of the welding current (see S33), and stops driving the inverter circuit 32 until the effective value Irms reaches the effective value target range. .
- the control device 33 ends the effective value control process and starts the current control process of the next cycle in response to the fact that the effective value Irms decreases and reaches the execution value target range.
- the welding current increases again from the bottom current toward the peak current range.
- the drive of the inverter circuit 32 is stopped over the energization standby time until the effective value Irms of the welding current reaches the effective value target range. For this reason, while performing the effective value control process, the welding current is maintained in a state where the welding current is limited to the lower limit value of the peak current range or less, so that the nuggets N1 and N2 generated between the metal plates are cooled by heat removal. You.
- the thickness of the first metal plate W1 is smaller than the thicknesses of the second metal plate W2 and the third metal plate W3.
- the heat reduction between the second metal plate W2 and the third metal plate W3 is smaller than the heat reduction between the first metal plate W1 and the second metal plate W2.
- the cooling amount of the nugget N2 due to heat removal is larger than the cooling amount of the nugget N1 due to heat removal.
- the growth rate of the nugget N2 in the peak state is faster than the growth rate of the nugget N1, and thus the welding current is maintained in a state where the welding current is limited to the peak current range or less over the energization standby time. By promoting the cooling, it is possible to suppress the occurrence of spatter between the second metal plate W2 and the third metal plate W3.
- the current control process of the next cycle is started in response to the effective value Irms of the welding current having reached the effective value target range, and the welding current is increased again, whereby each metal plate W1 is increased. Since the energy required to grow the nuggets N1 and N2 can be controlled between W3 and W3, it is possible to reliably join the workpieces while suppressing the occurrence of spatter as described above.
- welding system W work W1: first metal plate W2: second metal plate W3: third metal plate 1: spot welding device (welding device) 2: Gun body 21: Upper electrode tip (electrode) 26 ... Lower electrode tip (electrode) 3: welding power supply circuit 3a: welding control circuit 3b: DC welding transformer 3d: current sensor 31: converter circuit 32: inverter circuit 33: control device 34: transformer 35: rectifier circuit L1, L2: power line
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Abstract
Description
図1は、本実施形態に係るスポット溶接方法が適用された溶接システムSの構成を示す図である。
始めにS11では、制御装置33は、電流センサ3dから送信される電流検出信号を用いることによって、溶接電流の現在値である電流現在値Ipvを取得し、S12に移る。S12では、制御装置33は、溶接電流に対する目標値に相当する目標電流値Ispを設定し、S13に移る。図6に示すように、目標電流値Ispは、所定の電流立ち上げスロープ間又はピーク電流範囲の上限値と下限値との間に設定される。
S31では、制御装置33は、実効値制御処理の実行時間に相当する通電待機時間(図6参照)を計測するべく待機時間カウンタをスタートし、S32に移る。S32では、制御装置33は、電流センサ3dから送信される電流検出信号を用いることによって電流現在値Ipvを取得し、S33に移る。S33では、制御装置33は、S32で取得した電流現在値Ipvを用いることによって、S13と同じ手順によって溶接電流の実効値Irmsを算出し、S34に移る。
W…ワーク
W1…第1金属板
W2…第2金属板
W3…第3金属板
1…スポット溶接装置(溶接装置)
2…ガン本体
21…上電極チップ(電極)
26…下電極チップ(電極)
3…溶接電源回路
3a…溶接制御回路
3b…DC溶接トランス
3d…電流センサ
31…コンバータ回路
32…インバータ回路
33…制御装置
34…トランス
35…整流回路
L1,L2…電力線
Claims (3)
- 溶接電流を供給することによってワークを接合するスポット溶接方法であって、
前記溶接電流は、設定されたピーク電流範囲内に達する又は維持されるピーク状態と、前記ピーク電流範囲からボトム電流へ向けて下降した後、再び前記ピーク電流範囲へ向けて上昇する非ピーク状態とが交互に実現されるパルス状波形を有し、
前記非ピーク状態では、前記溶接電流の実効値が設定された目標範囲内に達した場合に前記溶接電流を前記ピーク電流範囲へ向けて上昇させる電流制御を開始することを特徴とするスポット溶接方法。 - 所定時間内に前記電流制御が開始しない場合には、前記溶接電流の供給を停止するとともに異常が生じたことを報知することを特徴とする請求項1に記載のスポット溶接方法。
- 前記ワークは、3枚以上の金属板を重ねて構成さる積層体であり、
前記3枚以上の金属板の少なくとも1枚の金属板は他の金属板と厚みが異なるように形成されることを特徴とする請求項1又は2に記載のスポット溶接方法。
Priority Applications (4)
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CN201980058181.4A CN112654454B (zh) | 2018-09-05 | 2019-08-20 | 点焊方法 |
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JP2013151018A (ja) * | 2011-12-27 | 2013-08-08 | Mazda Motor Corp | 溶接方法 |
WO2015037652A1 (ja) * | 2013-09-12 | 2015-03-19 | 新日鐵住金株式会社 | 抵抗スポット溶接方法および溶接構造物 |
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JPS6043233B2 (ja) * | 1981-03-20 | 1985-09-27 | 株式会社電元社製作所 | 抵抗溶接機における溶接電流波形制御方法及びその装置 |
JP2732154B2 (ja) * | 1991-05-08 | 1998-03-25 | ミヤチテクノス株式会社 | インバータ式抵抗溶接制御方法 |
JP2000084678A (ja) * | 1998-09-08 | 2000-03-28 | Toshiba Fa Syst Eng Corp | 抵抗溶接機の制御装置 |
JP5127788B2 (ja) * | 2009-08-01 | 2013-01-23 | 株式会社豊田中央研究所 | 抵抗溶接方法、抵抗溶接部材、抵抗溶接機、抵抗溶接機の制御方法とその制御プログラムおよびその制御装置並びに抵抗溶接の評価方法とその評価プログラムおよびその評価装置 |
KR101106952B1 (ko) * | 2009-09-07 | 2012-01-20 | 주식회사 파워웰 | 지능형 네트워크를 구비한 직류 인버터 점용접 장치 및 그 운용방법 및 기록매체 |
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JP2013111586A (ja) * | 2011-11-25 | 2013-06-10 | Jfe Steel Corp | 高強度鋼板の抵抗スポット溶接方法 |
JP2013151018A (ja) * | 2011-12-27 | 2013-08-08 | Mazda Motor Corp | 溶接方法 |
WO2015037652A1 (ja) * | 2013-09-12 | 2015-03-19 | 新日鐵住金株式会社 | 抵抗スポット溶接方法および溶接構造物 |
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CN112654454B (zh) | 2022-09-27 |
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