CN201415310Y - Precision spot welder - Google Patents

Abstract

The utility model provides a precision spot welder which is mainly applied in the welding of an enameled wire leading-out contact in manufacturing various electronic components with small coils and the welding of small parts and comprises a main power supply, a welding head and a nose. The main power supply comprises a solder mask transformer and a power control unit and provides pulse output of step waves by the power control unit to output appropriate current for welding, and the nose causes the output of the solder mask transformer to be connected with the welding head and provides weldingforce. The resistance welding spot welder of step wave output reduces the damage of the welding head by too large current in burning off insulating paint of the enameled wire and prolongs the servicelife of the welding head.

Description

A kind of accurate mash welder

Technical field

The utility model relates to a kind of accurate mash welder in a kind of Electronic Components Manufacturing equipment, and it is mainly used in the welding of in the various band small coil electronic devices and components making enamel-covered wire being drawn contact, also can be applicable to the precision welding to various fine workpiece.

Background technology

Directly welding enamel-covered wire technology is a kind of new technology, applicant has applied for comprising the directly electric spot-welding machine of welding lacquered wire (patent No. 011147857) in succession, electric welding head of pinpoint welding (patent No. 01114808X), prestressing force point welding electrode (patent No. 932453775), resistance welding head and preparation method thereof (number of patent application 20051212592), the spot welder head (patent No. 01114856X) that band pressure shows, welding head holder for spot welder (patent No. 011148314), the welding head holder (patent No. zL012423203) of band light source, directly weld the apparatus for monitoring working state (application number 2004100152231 of enamel-covered wire electric welding head of pinpoint welding,) wait multinomial patent, direct welding enamel-covered wire technology is reached its maturity.

But the various welding machine welding head life-spans of the prior art are not long, and what have has only a hundreds of solder joint.Because the soldering tip life-span is short, greatly applying of enamel-covered wire technology directly welded in influence.

The utility model content

The purpose of this utility model is: a kind of accurate mash welder is provided, and it can guarantee that welding machine provides accurate pulse output for direct welding enamel-covered wire, with the service life of the soldering tip that improves direct welding enamel-covered wire.

In order to solve the problems of the technologies described above, the utility model discloses a kind of accurate mash welder, comprise main power source, soldering tip and head, main power source comprises welding resistance transformer and power control, main power source provides ladder wavy pulse output by power control for welding, and head is connected the output of welding resistance transformer when welding with soldering tip.

Described power control comprises the control circuit that is used to provide pulse output, be used to provide signal to electrically connect display unit for output information to described control circuit with at least one function key of regulating impulse output with control circuit.

The staircase waveform that described power control provided is by forming ∠ θ, first ladder (V1), second ladder (V2) and weld interval (T), wherein, pulse output rises to first ladder with certain angle (θ), continue to rise to second ladder after keeping one section special time, and be maintained until end of output at second ladder.

The magnitude of voltage of described second ladder is setting value, the magnitude of voltage of first ladder for setting value 50% to 100% between, the holding time of first ladder is about half that set weld interval.Have at least a function key to be used to regulate the first ladder amplitude in the power control.The angle θ value that described output pulse is risen is adjustable, and adjustable range is 45 degree＜0＜90 degree.Have at least a function key to be used for regulating output pulse angle of elevation in the power control.The change-over switch of square wave and staircase waveform is installed on the described power control.Described welding machine is capacitance energy storage type welding machine or inverter welding machine.

The mash welder head that described mash welder head shows for band pressure.

The soldering tip of described mash welder is spot welding soldering tip or resistance welding head or pair of parallel electrode or a pair of upper/lower electrode.

The pulse output of the staircase waveform that described power control control circuit is provided can be passed through digital circuit DAC and realize, or adopts constant-current source that realization is switched in electric capacity charging and current potential.

Compared with prior art, the main power source of a kind of accurate mash welder of the utility model provides the pulse output of staircase waveform for the welding enamel-covered wire by power control, excessive electric current has prolonged the service life of soldering tip to the damage of soldering tip when having reduced the insulated paint of burn off enamel-covered wire.

Description of drawings

Fig. 1 is the coordinate diagram that a kind of accurate mash welder institute's output pulse amplitude of the utility model and width constitute staircase waveform;

Fig. 2 is the location drawing that welding machine circuit theory diagrams and A are ordered;

Fig. 3 is for to realize the circuit diagram of staircase waveform as shown in Figure 1 by digital circuit DAC;

Fig. 4 realizes the circuit diagram of staircase waveform as shown in Figure 1 for adopting constant-current source to electric capacity charging and current potential switching;

Fig. 5 is the waveform schematic diagram of the digital to analog converter DAC0 output of the circuit diagram of employing C8051F020 single-chip microcomputer among Fig. 4;

Fig. 6 is the relation curve schematic diagram of middle parameter θ of formula (2) and T;

Fig. 7 disturbs u for adopting constant-current source among Fig. 4 to the parameter of the embodiment of electric capacity charging formation oblique wave _c(t)-signal of the graph of relation of t.

The specific embodiment

Below in conjunction with accompanying drawing, describe the specific embodiment of a kind of accurate mash welder of the utility model in detail.

To directly weld enamel-covered wire, generally need to use the soldering tip that is disclosed in prestressing force point welding electrode (patent No. is 932453775), electric welding head of pinpoint welding (patent No. 01114808X) or resistance welding head and preparation method thereof (patent No. 20051212592).From the structure of these several soldering tips, the tip that constitutes two electrodes of soldering tip is respectively stress contact Ohmic contact or disjunctor.The utility model is through a large amount of experiment, research and analysis, directly the principle of welding enamel-covered wire can be summarized as: conducting electric current during welding, owing on the enamel-covered wire insulating barrier is arranged, all the flow through tip of two electrodes of soldering tip of electric current, make the most advanced and sophisticated electric spark that produces of soldering tip, the insulated paint burn off that contacts with soldering tip is stripped off bare metal; Afterwards, because the conductance of the conductance of copper core and metallic substrates is all greater than the conductance of electrode material in the enamel-covered wire, under the acting in conjunction of weld force and resistance heat, the contact resistance of soldering tip and workpiece is less than the contact resistance of two eletrode tips, a large amount of electric currents transfer to flow into workpiece, be implemented in same pulse output and finish the electric resistance welding welding, and the electric current of two eletrode tips of flowing through this moment becomes bias current.

The direct whole process of welding enamel-covered wire, the size of looking enamel-covered wire line footpath generally only needs several milliseconds can finish to tens milliseconds.Directly the electric spot-welding machine of welding lacquered wire (patent No. 011147857) or other precision welding machine of the prior art only require that generally the current/voltage of welding machine output is stable, and promptly output pulse waveform mostly is a square wave or near square wave.But, according to the Fundamentals of Welding of above-mentioned direct welding enamel-covered wire, before enamelled wire insulated paint was not removed, a large amount of electric currents are two eletrode tips by contact or disjunctor and produce electric spark at first, along with continuing of welding job, the electric spark that two eletrode tips produce repeatedly must influence its structure.When two eletrode tips can not produce electric spark again, insulated paint promptly can't burn off, and welding also just can not be carried out.So the soldering tip life-span of existing welding machine is not long, what have has only a hundreds of solder joint, and this greatly influences applying of direct welding enamel-covered wire technology.

Though the applicant thinks that the time of directly welding enamel-covered wire is very short, have only several milliseconds to tens milliseconds, do but whole process still can be divided into " burn off insulated paint " and " welding " two periods, so just can propose: whether burn off insulated paint period and welding needed electric current of period equate? whether original pulse wave reasonable with square wave output? how to provide precise current for directly welding enamel-covered wire?

For this reason, the utility model is used " electric resistance welding measuring and analysing meter " and is measured the directly electric current and the voltage actual waveform of welding enamel-covered wire process by with " high-speed camera " of 10,000/second frequencies the overall process of direct welding enamel-covered wire being taken; Measure the dynamic electric resistor situation of whole welding process simultaneously,, sum up the Fundamentals of Welding of above-mentioned direct welding enamel-covered wire, also draw following result simultaneously by above-mentioned high-tech means and analysis of science:

1. the burn off enamelled wire insulated paint does not need to weld so big electric current, although soldered enamel-covered wire line directly has the difference of size, the required electric current of burn off insulated paint is about about 65%～85% of welding.That is to say, should guarantee that two eletrode tips produce electric spark in order to burn off insulated paint, the electric spark that so big electric current causes two eletrode tips to produce when avoiding again exporting welding is too big, because excessive electric current of burn off enamel-covered wire period is harmful to the soldering tip tip.The photo of high-speed photography shows that also in the welding period, two eletrode tips do not have electric spark on the contrary, illustrate that this moment, electric current was to turn to the inflow weldment, and the electric current of two eletrode tips of flowing through becomes bias current.

2. needed burst length of burn off insulated paint and needed burst length of welding are about equally.

Result according to above-mentioned experimental analysis research, the utility model welding machine comprises main power source, soldering tip and head, wherein main power source is the major part of welding machine, main power source comprises a welding resistance transformer and power control, output and output cable are arranged on the welding resistance transformer, power control is then regulated and control the output of welding resistance transformer, so at welding field, welding machine main power source in other words in general, soldering tip and head then are the auxiliary facility of welding machine, wherein soldering tip also claims electrode, and the output connection side of need and welding resistance transformer can carry out welding job, and head promptly is to provide the part that connects and weld force is provided for it.Soldering tip in the utility model, can use electric welding head of pinpoint welding (patent No. 01114808X) or resistance welding head (patent No. 20051212592), if not the welding enamel-covered wire, also can use pair of parallel electrode or upper/lower electrode, and head can be selected spot welder head (patent No. 01114856X) for use.

The welding machine main power source is main contents of the present utility model.Main power source is generally selected the power factor (PF) height for use, response speed is fast, heating is concentrated, the capacitance energy storage type welding machine that weld interval is short, also can select the inverter welding machine for use, with the capacitance energy storage type welding machine is example, the capacitance energy storage type welding machine generally all is with the pulse output of square wave one by one, and control the size of output current by regulating impulse amplitude (voltage), the width (time) of each output pulse of capacitance energy storage type welding machine is very short, generally have only several milliseconds to tens milliseconds, the utility model is divided into two parts to so short pulse again by power control, be respectively the first half and the pulse output latter half of pulse output, because the amplitude of two parts is unequal, the similar ladder of shape is so can be referred to as staircase waveform, the first half of pulse output is first ladder, the latter half of pulse output is second ladder, and the former composition of staircase waveform comprises shown in Figure of description: pulse angle of elevation θ, the first ladder v1, the second ladder V2 and pulse output time T.Pulse output beginning, pulse voltage rises with certain angle θ, this ∠ θ is adjustable, when rising to certain altitude and highly keeping at this, this height and the composition first ladder V1 that holds time, the height of V1 is the certain percentage of setting value, and this percentage is adjustable, adjustable range generally can select 50% to 100% for use, and the time of keeping is about half that set the pulse output time.First ladder provides suitable current for burn off insulated paint; Voltage continues to rise to the height of setting voltage thereupon, and highly is maintained until the burst length end at this, and this period is referred to as the second ladder v2, and the second ladder V2 provides suitable current for welding.Because ∠ θ is variable, when ∠ θ determines, voltage rises to the time of first ladder also can be determined, so can not increase the time that voltage rises to first ladder in addition when the burst length is set.

Concrete, described power control comprises the control circuit that is used to provide pulse output, be used to provide signal to electrically connect display unit for output information to described control circuit with at least one function key of regulating impulse output with control circuit.

A kind of accurate mash welder of the utility model is in the setting of pulse output, the setting key that impulse output amplitude and width are not only arranged, also be one of function key of power control, also a pulse output be divided into the first ladder V1 and second ladder V2 composition staircase waveform.Because the wired footpath of soldered enamel-covered wire varies in size, the difference that the insulated paint material is arranged, also has difference of insulated paint thickness or the like, so the utility model first ladder amplitude is set to adjustable flexibly, in described function key, also be provided with the button adjustable to the amplitude of the first ladder V1, the scope of adjusting is for setting 50% to 100% of pulse amplitude values.Simultaneously, paired pulses angle of elevation θ also is set to adjustable flexibly, in other function key of welding machine, also is provided with the adjustable button of paired pulses angle of elevation θ, and the scope of adjusting is that 45 degree are to 90 degree.To satisfy to welding the needs of different enamel-covered wires and workpiece.

Below in conjunction with embodiment the formation of the utility model staircase waveform is described further.

The capacitance energy storage type welding machine of controlling electric current output with regulating impulse output amplitude (voltage) is an example, Fig. 1 is the coordinate diagram that output pulse amplitude and width constitute staircase waveform, and ordinate V is output pulse amplitude (voltage, the V of unit), abscissa T is output pulse width (time, the ms of unit).The ladder wave structure by pulse angle of elevation ∠ θ, the first ladder V1, the second ladder V2 and weld interval T constitute.It is initial that pulse is exported, and impulse amplitude V rises with certain angle θ, and wherein ∠ θ is less than or equal to 90 degree more than or equal to 45.When impulse amplitude rises to the certain percentage of setting value, to keep in this amplitude, the time of keeping is about half of pulsewidth setting value, and this period is referred to as the first ladder V1, and amplitude rises to setting value again and is maintained until the pulse end of output in this amplitude thereupon.This period is referred to as the second ladder v2.In the Figure of description 1, the impulse amplitude that ∠ θ=75 degree are set is 1.0v, be 8ms weld interval, when requiring first ladder is 75% (3/4) of setting amplitude, output pulse amplitude rises to 0.75v with 75 degree so, and keep 4ms at 0.75v and constituted the first ladder V1, impulse amplitude rises to 1.0v again and keeps 4ms then, has constituted the second ladder V2.

Because ∠ θ is variable, after the value of having determined ∠ θ, impulse amplitude rises to the time of first ladder of setting value just to be determined, so do not need to increase in addition the time of this ∠ θ rising when pulse width is set.

This is provided with staircase waveform is to finish in same pulse output, and first ladder is in order to the insulated paint on the burn off enamel-covered wire, and second ladder is in order to welding.It is divided into several waveforms to welding with some document introduction, if any preheat pulse, weld pulse, to keep pulse be diverse notion.Preheat pulse, weld pulse, to keep these several pulses of pulse be independently to export separately, between preheat pulse and the weld pulse, or weld pulse and keep certain intermittent time is all arranged between the pulse, and this is provided with first ladder of staircase waveform and second ladder is continuous fully, does not have intermittently between two ladders.

The pulse output resistance welding spot welding machine of the utility model staircase waveform, not only can be applied in the welding enamel-covered wire, precision welding for fine workpiece, welding as various instrument and meters on the connection of the repairing of printed circuit board (PCB), solar cell, medical treatment, national defence, the space flight and aviation, first ladder with staircase waveform is done preheating, splash for minimizing, improve welding quality, all traditional preheat pulse better effects if is intermittently arranged with weld pulse than adopting, this and welded piece are too tiny, are easy to scatter and disappear relevant at the intermittent phase heat.Simultaneously, because the capacitance energy storage type welding machine discharge time is short, transient current peak value height, the pulse angle of elevation of the utility model staircase waveform can effectively be controlled the impact of transient high-current to workpiece, reduces the adhesion of electrode and workpiece, improves the service life of electrode.Certainly, weld the fine workpiece of these non-enamel-covered wires, just should use parallel pole or upper/lower electrode.

Again further combined with the circuit of patent 011147857 welding machine, the staircase waveform that how to obtain setting on circuit is described below.

Fig. 2 is the circuit theory diagrams of patent 011147857 welding machine, as shown in Figure 2, as long as apply at A point that an amplitude is suitable, shape voltage waveforms arbitrarily, through amplifying the acting in conjunction with feedback circuit, just can obtain one at the output of pulse transformer amplitude is proportional and voltage waveform that shape is identical.

Therefore if want the voltage waveform of welding machine output as Fig. 1, will be at the identical voltage waveform of the proportional and shape of amplitude of A point generation and figure one.The method that produces voltage waveform as shown in Figure 1 has multiple, can adopt analog circuit or the digital circuit control circuit as power control on circuit structure, and perhaps analog circuit and digital circuit combine.Fig. 3 is implemented in welding terminal and obtains circuit diagram as the ladder wave mode of Fig. 1 for passing through digital circuit: DAC; Fig. 4 is implemented in welding terminal and obtains circuit diagram as the ladder wave mode of Fig. 1 for adopting constant-current source that electric capacity charging and current potential are switched.

The course of work of two circuit is described respectively below.

Adopt the C8051F020 single-chip microcomputer among Fig. 3, it is an integrated mixed signal SOC(system on a chip) (SOC), and its speed of service has multiple functional module up to 25MPIS.Have two 12 figure place weighted-voltage D/A converter DAC0 and DAC1 in its sheet, conversion speed can be up to 1MHz.Can satisfy the application requirements of this welding machine fully, finish the control work of whole welding machine, export accurate and level and smooth voltage waveform.In the circuit, DAC0 is used to export voltage waveform as shown in Figure 5, and the shape of waveform is produced by sequential operation, and voltage waveform signal carries out smothing filtering through capacitor C 32 again through a voltage follower (U7324-B), is added on the A point; DAC1 then according to the setting voltage value of input, to charging circuit, regulates the voltage of storage capacitor C30 through sequential operation output correspondent voltage value Ua, to guarantee C30 enough energy output is arranged, and forms satisfactory complete output waveform.

At one's leisure, single-chip microcomputer constantly reads the data that voltage dial and time drapes over one's shoulders dish.According to the numerical value that the time dial is set, set the width t that timer is controlled the output pulse; The output voltage U a of the setting value DAC1 that sets according to the voltage driver chuck, thus the voltage of storage capacitor C30 regulated, also calculate one group of output data of DAC0 simultaneously, make the voltage waveform of its output shape such as Fig. 1.It is corresponding that these group data and user set magnitude of voltage, and change along with the change of setting value.The DAC0 output data groups is according to formula (1), and (2) carry out computing:

$\mathrm{Dn}=\frac{\mathrm{Un}}{\mathrm{Uo}}\×2^{12}---\left(1\right)$

$\mathrm{Un}=\mathrm{tg\θ}\×t_n=\mathrm{tg\θ}\×n\×T=\mathrm{tg\θ}\×n\×\frac{1}{f}---\left(2\right)$

Dn represents n the digital-to-analogue translation data that DAC0 will export in the formula (1), and Uo represents the full width of cloth magnitude of voltage of DAC0 output, 2 ¹²Data when the full width of cloth of expression is exported.θ is the voltage angle of elevation in the formula (2), and T is the DAC0 update cycle, and θ and T are set by program, can regulate easily.Their relation as shown in Figure 6.

At one's leisure, the DAC0 output voltage is 0V, when satisfying trigger condition, produce negative saltus step at single-chip microcomputer 62 pin, interrupt, single-chip microcomputer promptly begins to export a numerical value to U1, U2, U3 every one-period T from 0V, forms the slow felt reputation voltage that rises at DAC0 output pin (100 pin), and process voltage follower and capacitor C 32 filtering are added on the A point; When the ramp voltage value had reached 3U/4, DAC0 just kept current magnitude of voltage constant, and the startup timer picks up counting; When timing reaches t/2, DAC0 exports n+1 transforming numerical, makes output voltage reach u, and keeps the current magnitude of voltage t/2 time constant, arrives second t/2 constantly when the time, and DAC0 output becomes 0V immediately, finishes an output procedure.Just having formed a width like this on the A point is t, the voltage waveform of shape such as Fig. 5; Also achieve the goal simultaneously: it is consistent with setting value also to have obtained an amplitude at output, the voltage waveform of shape such as Fig. 5.

Hence one can see that, as long as the update cycle T enough little (as 10 microseconds) of DAC0, then in whole output procedure, the uphill process of voltage waveform can be thought level and smooth.And the shape of waveform comprises angle of elevation, and the width t of the amplitude proportional of first ladder, width ratio and pulse is fully by program decision, can be in harmonious proportion in≤90 degree that to realize that first staircase waveform sets value u≤100% adjustable so just be easy to realize ∠ θ.

Fig. 4 adopts constant-current source that electric capacity charging is formed oblique wave, switches with current potential and forms staircase waveform, can produce as shown in Figure 1 voltage waveform in conjunction with programme-control.Wherein the rate of rise of oblique wave is determined jointly by R108 and C12, and the amplitude proportional of staircase waveform determines that by R95 and R107 width ratio and pulse width t are by programme-control.Q7, Q8, Q9, R108 constitute typical transistors mirror image constant current source (abbreviation constant-current source) among the figure, and c12 is that the negative of constant-current source cuts..。。

Its waveform generation procedure declaration is as follows:

At one's leisure, single-chip microcomputer is waited for triggering signal at any time, CON1=0, and Q4 ends, CON3=1, Q5 ends, CON2=0, the Q6 conducting is moved C12 voltage U c to zero, so Ub is O.So the voltage follower that U7 one C constitutes output also is 0V.Charging circuit has enough energy output according to the voltage of setting voltage value Ua adjustment storage capacitor C30 to guarantee C30, forms satisfactory complete output waveform.

When satisfying trigger condition, single-chip microcomputer 12 human hair combing wastes are given birth to negative saltus step, cause interruption, begin output welding waveform immediately.Under Single-chip Controlling, CON2=1, Q6 ends, CON3=1, Q5 ends, CON1=1, voltage comparator U7-B inverting input voltage is Ub=0, in-phase end be 3u% greater than 0v, output HIGH voltage relatively, so Q4 conducting constant-current source circuit is started working, I charges to C12 with stabilized power source, and the C12 both end voltage is by zero beginning linear growth, and the A point voltage equals Ub and equals the C12 both end voltage, also linear growth, forming a slope is the rising voltage waveform of I.

When Ub rises to 3Ua/4, CONI=1, CON2=1, CON3=1 remains unchanged.Voltage comparator U7-B both end voltage equates that comparator output becomes electronegative potential, so ud is an electronegative potential also, Q4 ends, and DC source quits work, and the C12 both end voltage stops to rise; Meanwhile because Ud by high step-down, produces interruption immediately at single-chip microcomputer 13 pin, single-chip microcomputer picks up counting, and the % of continuous and time set value compares.This moment, the effect of voltage comparator U7-B was that Ub and Ue (being 3Ua/4) are consistent, and was the voltage waveform of 3Ua/4 with regard to the formation amplitude at the A point.

When single-chip microcomputer judged that relatively timing arrives the % that sets, 3u% had kept the % duration at the A point, CONI=I, and CON2=1 remains unchanged, and sets CON3=0 immediately, the Q5 saturation conduction, magnitude of voltage Ua is added to Ub immediately, and the A point voltage is Ua from the 3u% saltus step.Meanwhile single-chip microcomputer continues timing, and the t of continuous and time set value compares.

When single-chip microcomputer judged that relatively timing arrives the t that sets, Ua had kept the t/2 duration at the A point, and single-chip microcomputer is set CON1=0 immediately, CON2=0, CON3=1, Q4, Q5 end, the Q6 conducting is moved output voltage U b to zero immediately, and the voltage that A is ordered also becomes 0 at once.

So just formed a stepped voltage waveform at the A point, the wave-shape amplitude of front is t/2 for the 3Ua/4 width, and the wave-shape amplitude of back is t/2 for the Ua width.A complete pulse output procedure finishes, and welding machine changes idle condition over to, waits for the next arrival that triggers.

According to the circuit diagram of present embodiment, the generation of this staircase waveform is at Fig. 2, and the A point of circuit theory diagrams applies the another one voltage waveform and obtains.Therefore just can a change-over switch be installed at the A point, the utility model mash welder just can use original square wave or staircase waveform of the present utility model respectively by instructions for use like this.

Power control provides the pulse output of staircase waveform for directly welding enamel-covered wire, be to serve as according to setting with the Fundamentals of Welding that the utility model proposes direct welding enamel-covered wire, the pulse of staircase waveform output has reduced the impact of excessive electric current of burn off insulated paint period to two eletrode tips, and the electric current of welding period transfers to flow into weldment in a large number, so the current/voltage of welding period can not produce too much influences to two eletrode tips.What the utility model proposes exports with the staircase waveform pulse, has prolonged the service life of direct welding enamel-covered wire soldering tip widely.Test to use 010047857 welding machine, the same use ZL011147088 patent soldering tip or the patent No. are 2005121592 resistance welding head, weld identical enamel-covered wire and workpiece, after having used the staircase waveform output pulse waveform and originally, compare with the impulse waveform of square wave output, the solder joint number of soldering tip welding increases with ten multiples, look the difference in welding enamel-covered wire line footpath, can reach more than tens thousand of solder joints, prolonged the service life of soldering tip greatly.

Certainly, the utility model can't be exhaustive all realize the circuit of output staircase waveforms, but, all that those skilled in the art made are used to produce the circuit improvement of staircase waveform, all can draw according to the disclosed content simple transformation of the utility model, therefore, this kind improvement should be considered as not breaking away from spirit of the present utility model.

Claims (10)

1, a kind of accurate mash welder, it is characterized in that, it comprises main power source, soldering tip and head, main power source comprises welding resistance transformer and power control, main power source provides ladder wavy pulse output by power control for welding, and head is connected the output of welding resistance transformer when welding with soldering tip.

2, accurate mash welder as claimed in claim 1, it is characterized in that described power control comprises the control circuit that is used to provide pulse output, be used to provide signal to electrically connect display unit for output information to described control circuit with at least one function key of regulating impulse output with control circuit.

3, accurate mash welder as claimed in claim 2, it is characterized in that, the staircase waveform that described power control provided is by forming angle θ, first ladder (V1), second ladder (V2) and weld interval (T), wherein, pulse output rises to first ladder with certain angle (θ), continue to rise to second ladder after keeping one section special time, and be maintained until end of output at second ladder.

4, accurate mash welder as claimed in claim 3 is characterized in that, the magnitude of voltage of described second ladder is setting value, the magnitude of voltage of first ladder for setting value 50% to 100% between, the holding time of first ladder is about half that set weld interval.

5, accurate mash welder as claimed in claim 4 is characterized in that, has at least a function key to be used to regulate the first ladder amplitude in the power control, and, have at least a function key to be used for regulating output pulse angle of elevation in the power control.The change-over switch of square wave and staircase waveform is installed on the power control.

6, accurate mash welder as claimed in claim 3 is characterized in that, the angle θ value that described output pulse is risen is adjustable, and adjustable range is 45 °≤θ≤90 °.

7, accurate mash welder as claimed in claim 1 is characterized in that, described welding machine is capacitance energy storage type welding machine or inverter welding machine.

8, accurate mash welder as claimed in claim 1 is characterized in that, the mash welder head that described mash welder head shows for band pressure.

9, accurate mash welder as claimed in claim 1 is characterized in that, the soldering tip of described mash welder is spot welding soldering tip or resistance welding head or pair of parallel electrode or a pair of upper/lower electrode.

10, accurate mash welder as claimed in claim 1 is characterized in that, the pulse output of the staircase waveform that described power control control circuit is provided can be passed through digital circuit DAC and realize, or adopts constant-current source that realization is switched in electric capacity charging and current potential.

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