CN207181347U - A kind of device that metal welding seam welding quality is tested with big DC current - Google Patents
A kind of device that metal welding seam welding quality is tested with big DC current Download PDFInfo
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- CN207181347U CN207181347U CN201721015470.0U CN201721015470U CN207181347U CN 207181347 U CN207181347 U CN 207181347U CN 201721015470 U CN201721015470 U CN 201721015470U CN 207181347 U CN207181347 U CN 207181347U
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Abstract
It the utility model is related to a kind of device that metal welding seam welding quality is tested with big DC current, including main control chip；It is connected with the main control chip, the current impulse module for producing pulse current；It is connected with the main control chip, for measuring voltage differential variable quantity and carrying out the resistance value computing module of weld seam resistance value calculating；It is connected with the main control chip, the pin-saving chip for data storage；The display for being connected with the main control chip, being shown for result；And it is connected with the main control chip, the control panel for control command input；Designed more than, when being used cooperatively with laser welding apparatus, more than 10% sectional area or recall rate >=98% of the metal welding seam defect of 2mm line lengths, testing cost is 10% or so of existing test equipment, weld seam speed is tested up to 1 meter/S, automatic decision, does not produce ray radiation.
Description
Technical field
It the utility model is related to the device of test metal welding seam welding quality, more particularly to a kind of big DC current test
The device of metal welding seam welding quality.
Background technology
Existing weld seam welding quality detection method includes：It is imaged class testing, infiltration class or magnetic class testing, mechanics class is surveyed
Examination.
It is imaged class testing：Ray class is imaged and the imaging of sound wave class.
Testing feature：Two-dimentional class welding assembly test can only be carried out, ray kind equipment is special equipment, inconvenient for use, is needed
Artificial auxiliary judgment is wanted, it is necessary to high by professional training, False Rate.Sound wave class is imaged, defect show it is not directly perceived, it is artificial to judge to be stranded
Hardly possible is, it is necessary to which professional staffing, False Rate are high.
Permeate class or magnetic class testing
Testing feature：Test speed is slow, and environment influences very big, and Detection results are poor the defects of to weld seam inside, to artificial
Judgement dependency degree it is high.
Mechanics class testing：Additional certain power, test structure intensity and air-tightness
Testing feature：Tested using pressure, pulling force, air pressure etc., use range is narrow, has certain destructiveness, test knot
Fruit multiplicity is not high.
The shortcoming of weld seam reduces section of weld joint product, reduces bearing capacity, produces stress concentration, causes crackle；Reduce fatigue
Intensity, weldment rupture is easily caused to cause brittle failure.What wherein harm was maximum is weld crack and incomplete fusion.It is that some are welded out below
The problem of existing：1st, crackle, weldering of breaking；2nd, pit, depression, undercut；3rd, incompletely filling and welding kicks the beam；4th, burn and welded with crossing；5th, stomata
With slag inclusion；6th, do not merge and merge and be bad.
Welding is ensuring that weld seam and solder joint have the area of enough good fusions, come ensure enough structural strengths and
Fatigue strength.
The various defects of metal welding seam have a direct impact to the conductance ability of weld seam in itself, by the conductance for testing weld seam
Value is distributed with conductance, to test the welding quality of weld seam.Control mode is surveyed from the super capacitor/power power battery of our company
The inner walkway function in equipment is tried, test mode derives from the high-power electronic load of our company.The former is required with not
With electric current pulsewidth test the influence of the ohmic internal resistance of power battery, concentration difference internal resistance, polarization resistance to output；The latter requires to survey
Examination precisely tests microvolt level voltage drop change degree in the strongly disturbing test environment such as 1000V high direct voltages.
Utility model content
The purpose of this utility model is to provide a kind of device that metal welding seam welding quality is tested with big DC current, with solution
Certainly at least one of drawbacks described above existing for prior art.
For the above-mentioned purpose, the technical solution adopted in the utility model is as follows：
It is a kind of with big DC current test metal welding seam welding quality method, it is characterised in that methods described include with
Lower step：
S1：The DC pulse high current of a Parameter adjustable is produced to weld seam, test is because voltage caused by current impulse
Differential variation amount；
S2：The resistance value of weld seam is calculated according to Ohm's law；Pass through weld seam resistance value and the size of original material resistance value
To judge the welding quality of weld seam.
Preferably, the adjustable parameter of the DC pulse high current in the step S1 is respectively that amplitude, slope, pulse are wide
Degree.
Preferably, the voltage differential variable quantity in the step S1 is surveyed by way of first AC coupled again dc-couple
Examination.
Preferably, in the step S2 when detecting weld seam resistance value in the 95%-105% threshold values of original material resistance value
To be qualified；Weld seam resistance value is small defect in the 105%-110% threshold values of original material resistance value；Weld seam resistance value is in original material
It is big defect in the 110%-200% threshold values of resistance value；200%-1000% threshold value of the weld seam resistance value in original material resistance value
Interior is part rosin joint；Weld seam resistance value is solder skip when being more than 10 times of original material resistance value.
Preferably, the small defect is bubble, ripple or the slag inclusion that sectional area is less than 0.1mm.
Preferably, the big defect is thin to split weldering or weld seam.
A kind of device that metal welding seam welding quality is tested with big DC current, it is characterised in that described device includes：
Main control chip；
It is connected with the main control chip, the current impulse module for producing pulse current；
It is connected with the main control chip, for measuring voltage differential variable quantity and carrying out the resistance of weld seam resistance value calculating
It is worth computing module；
It is connected with the main control chip, the pin-saving chip for data storage；
The display for being connected with the main control chip, being shown for result；
And it is connected with the main control chip, the control panel for control command input.
Preferably, the current impulse module includes：
It is connected with the main control chip, Power convert and precision voltage source for power supply；
It is connected respectively with the main control chip, the Power convert and precision voltage source, for generation and control loop arteries and veins
Rush the electronic load of electric current.
Preferably, the resistance value computing module includes：
For the termination power of voltage differential variable quantity to be in contact, measured with weld seam；
It is connected respectively with the termination power, the main control chip, the discharge circuit for read back waveform amplification；
It is connected respectively with the discharge circuit, the termination power, the adc circuit for analog-to-digital conversion；
And the filtering operation circuit being connected respectively with the adc circuit, the main control chip.
Compared with prior art, the utility model at least has the advantages that：The utility model method includes S1：It is right
Weld seam produces the DC pulse high current of a Parameter adjustable, and test is because voltage differential variable quantity caused by current impulse；S2：
The resistance value of weld seam is calculated according to Ohm's law；Weld seam is judged by the size of weld seam resistance value and original material resistance value
Welding quality；Designed more than, when being used cooperatively with laser welding apparatus, more than 10% sectional area or 2mm line lengths
Metal welding seam defect recall rate >=98%, testing cost be existing test equipment 10% or so, test weld seam speed
Degree automatic decision, does not produce ray radiation up to 1 meter/S.
Brief description of the drawings
Fig. 1 is the block diagram of the utility model preferred embodiment.
Embodiment
The utility model is described further below according to embodiment.
It is a kind of with big DC current test metal welding seam welding quality method, it is characterised in that methods described include with
Lower step：
S1：The DC pulse high current of a Parameter adjustable is produced to weld seam, test is because voltage caused by current impulse
Differential variation amount；
S2：The resistance value of weld seam is calculated according to Ohm's law；Pass through weld seam resistance value and the size of original material resistance value
To judge the welding quality of weld seam.
Preferably, the adjustable parameter of the DC pulse high current in the step S1 is respectively that amplitude, slope, pulse are wide
Degree.
Preferably, the voltage differential variable quantity in the step S1 is surveyed by way of first AC coupled again dc-couple
Examination.
Preferably, in the step S2 when detecting weld seam resistance value in the 95%-105% threshold values of original material resistance value
To be qualified；Weld seam resistance value is small defect in the 105%-110% threshold values of original material resistance value；Weld seam resistance value is in original material
It is big defect in the 110%-200% threshold values of resistance value；200%-1000% threshold value of the weld seam resistance value in original material resistance value
Interior is part rosin joint；Weld seam resistance value is solder skip when being more than 10 times of original material resistance value.
Preferably, the small defect is bubble, ripple or the slag inclusion that sectional area is less than 0.1mm.
Preferably, the big defect is thin to split weldering or weld seam.
The test philosophy of the present embodiment is to add an accurate glitch-free big DC pulse current to weld seam.So as to test
Because voltage disturbance caused by pulse current.(impedance) and feature are distributed by the conductance for precisely testing weld seam, to judge weld seam
Whether enough welding good metal connection area is had.It is intact to judge whether weld seam connects.
The test environment of this test is the big DC current pulse for standard of realizing.Precision voltage source ensures the interference of pulse first
Small (10ppm ripples), stability are good (30ppm load regulations).Swift electron loads, and amplitude accuracy 0.05%, pulse is wide
Spend accuracy (1uS), slope (12bit).And electronic load is to be connected on current loop, ensure there are enough magnitudes of voltage really
Realize the current impulse in weld seam.
Disturbance caused by pulse current is nV to uV fluctuation, and this thermoelectricity that constantly existing interference includes uV ranks moves
Gesture, the electromagnetic interference of mV ranks, hundreds of V basic voltage existing for the circuit such as interference, battery of the v ranks of power supply.
The fluctuation that quasi- nV ranks are read under the interference of hundreds of V substrate and V ranks is the core technology of Etard observing and controlling, signal
Multiple coupling and mathematical algorithm multiple filter be this test core.
This test is tested using the non-Kelvin's line of end altogether, and four-wire system test mode, electric current line ensures enough line footpaths
Separately it is twisted with voltage retaking of a year or grade line, electric current line outside, including pressure-wire, is close to weld seam and moves scanning.
Test current impulse exception or sampling is abnormal, alarmed, prevented because of connection failure or weld seam not
Test errors caused by flat.
Test starts：Tested by software instruction or outside high level, test card.
Test terminates：Software instruction or outside low level are provided, test card stops test.
As a result judge：Test result judges that being divided into single-point judges and totally judge.Whether single-point judges the current test point of disk
It is qualified, or classification.Qualified test point accounts for the ratio always counted in the overall solder joint test for judging current weld seam, and it is qualified to judge
Whether.
As a result indicate：Two instruction mouths, one is current test point, and high level is qualified, and another port is overall
Test, high level are to be completed rear current weld is accepted.Test result and data can upload to test software.
State instruction：Including test card running status, working condition, test mode etc..
The characteristics of this test, is：Its accuracy is high, and stability is high；Automatic decision, hand off, erroneous judgement is few；Energy
Quick detection goes out the defects of having a great influence and position；Can accurately it reflect in the 0.1mm change of section of weld joint product and 2mm
Length defect；It is radiationless, on weld seam without influence, on employee without influence；Test speed is fast, and weld seam that can be more than 10cm/S is tested
Speed；Defect detection rate is high, the larger recall rate of defect 98%；Cost-effective, cost is low, and automation controllability is high；Means of testing
Mature and reliable, by test point signal, to express metal welding quality.
Why not using exchange direct current is needed to use for the present embodiment, reason is as follows simultaneously：Alternating current has zero passage
Point, the current distortion rate of zero crossing is too high, it is difficult to ensure that accuracy and stability；AC influence is too many, inductance caused by cable,
Lead to not the current amplitude and waveform ensured to weld seam；Civil power, power frequency magnetic field etc. are too big to test interference；Measuring circuit is done
Disturb too big；Alternating current has kelvin effect (metal surface electric current is big, and central current is small) can not monitor weld seam internal soundness；
It is poor that test effect is welded to magnetic metal；Alternating current can produce vortex, can not produce that to stablize clean electric field and standard unified
Test environment.
Why not using low current high current is needed to use for the present embodiment, reason is as follows simultaneously：Weld seam itself hinders
Anti- very little, low current can not test conductance change；Low current is easily disturbed, and can not form standard test environment；Low current draws
The voltage drop risen is too small, and testing precision is too poor；The crackle of weld seam, burn-through, thawing is bad reactionless to low current, is not easy area
Point；Bad inside weld seam, low current test effect is poor；Low current causes must be close between test card and weld seam, can not install,
Just give sensitive to electromagnetic interference.
Why not using follow current pulse is needed to use for the present embodiment, reason is as follows simultaneously：Follow current pair
Power reguirements are high, too high to wire connection request；Follow current can cause test card and weld seam to generate heat, and test card heating can cause
Temperature drift, weld seam heating can cause more serious thermo-electromotive force and secondary quenching, make weld seam secondary defect；Follow current can not use
Filtering measurement.And test result can include thermo-electromotive force, and the value of thermo-electromotive force is the number of voltage drop caused by weld seam resistance
Ten times, it is difficult to differentiate the conductance change of weld seam, cause serious forgiveness small, erroneous judgement increase；Follow current can not move when testing, or
Can be burnt metal surface.
According to a kind of above-mentioned method that metal welding seam welding quality is tested with big DC current, have also been proposed a kind of with big straight
The device of testing current metal welding seam welding quality is flowed, it is specific as follows：
As shown in figure 1, a kind of device that metal welding seam welding quality is tested with big DC current, it is characterised in that described
Device includes：
Main control chip；
It is connected with the main control chip, the current impulse module for producing pulse current；
It is connected with the main control chip, for measuring voltage differential variable quantity and carrying out the resistance of weld seam resistance value calculating
It is worth computing module；
It is connected with the main control chip, the pin-saving chip for data storage；
The display for being connected with the main control chip, being shown for result；
And it is connected with the main control chip, the control panel for control command input.
Preferably, the current impulse module includes：
It is connected with the main control chip, Power convert and precision voltage source for power supply；
It is connected respectively with the main control chip, the Power convert and precision voltage source, for generation and control loop arteries and veins
Rush the electronic load of electric current.
Preferably, the resistance value computing module includes：
For the termination power of voltage differential variable quantity to be in contact, measured with weld seam；
It is connected respectively with the termination power, the main control chip, the discharge circuit for read back waveform amplification；
It is connected respectively with the discharge circuit, the termination power, the adc circuit for analog-to-digital conversion；
And the filtering operation circuit being connected respectively with the adc circuit, the main control chip.
The utility model is described in detail above by specific embodiment, these detailed description are only limited to
Content of the present utility model is helped skilled in the art to understand, the limit to scope of protection of the utility model can not be interpreted as
System.The scope of protection of the utility model is defined by the content of claims.
Claims (3)
1. a kind of device that metal welding seam welding quality is tested with big DC current, it is characterised in that described device includes：
Main control chip；
It is connected with the main control chip, the current impulse module for producing pulse current；
It is connected with the main control chip, based on measuring voltage differential variable quantity and carrying out the resistance value of weld seam resistance value calculating
Calculate module；
It is connected with the main control chip, the pin-saving chip for data storage；
The display for being connected with the main control chip, being shown for result；
And it is connected with the main control chip, the control panel for control command input.
2. a kind of device that metal welding seam welding quality is tested with big DC current according to claim 1, its feature exist
In the current impulse module includes：
It is connected with the main control chip, Power convert and precision voltage source for power supply；
It is connected respectively with the main control chip, the Power convert and precision voltage source, for generation and control loop pulse electricity
The electronic load of stream.
3. a kind of device that metal welding seam welding quality is tested with big DC current according to claim 1 or 2, its feature
It is, the resistance value computing module includes：
For the termination power of voltage differential variable quantity to be in contact, measured with weld seam；
It is connected respectively with the termination power, the main control chip, the discharge circuit for read back waveform amplification；
It is connected respectively with the discharge circuit, the termination power, the adc circuit for analog-to-digital conversion；
And the filtering operation circuit being connected respectively with the adc circuit, the main control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721015470.0U CN207181347U (en) | 2017-08-12 | 2017-08-12 | A kind of device that metal welding seam welding quality is tested with big DC current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721015470.0U CN207181347U (en) | 2017-08-12 | 2017-08-12 | A kind of device that metal welding seam welding quality is tested with big DC current |
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| CN207181347U true CN207181347U (en) | 2018-04-03 |
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| CN201721015470.0U Active CN207181347U (en) | 2017-08-12 | 2017-08-12 | A kind of device that metal welding seam welding quality is tested with big DC current |
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| CN (1) | CN207181347U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328821A (en) * | 2017-08-12 | 2017-11-07 | 深圳市埃塔测控技术有限公司 | A kind of method and apparatus that metal welding seam welding quality is tested with big DC current |
| CN109596677A (en) * | 2018-11-02 | 2019-04-09 | 大族激光科技产业集团股份有限公司 | A kind of quality detection device, method, system and integrated probe component |
-
2017
- 2017-08-12 CN CN201721015470.0U patent/CN207181347U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328821A (en) * | 2017-08-12 | 2017-11-07 | 深圳市埃塔测控技术有限公司 | A kind of method and apparatus that metal welding seam welding quality is tested with big DC current |
| CN109596677A (en) * | 2018-11-02 | 2019-04-09 | 大族激光科技产业集团股份有限公司 | A kind of quality detection device, method, system and integrated probe component |
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