CN106735664B - Method for welding - Google Patents
Method for welding Download PDFInfo
- Publication number
- CN106735664B CN106735664B CN201610842571.9A CN201610842571A CN106735664B CN 106735664 B CN106735664 B CN 106735664B CN 201610842571 A CN201610842571 A CN 201610842571A CN 106735664 B CN106735664 B CN 106735664B
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- China
- Prior art keywords
- metal pipe
- heated object
- soldering
- annular
- scolding tin
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Classifications
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
- B23K3/047—Heating appliances electric
- B23K3/0475—Heating appliances electric using induction effects, e.g. Kelvin or skin effects
-
- 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
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Dermatology (AREA)
- General Health & Medical Sciences (AREA)
- General Induction Heating (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The present invention provides and a kind of can prevent not the melting of solder when induction brazing, permeate the undesirable method for welding of quality as insufficient and metal tube melting and breakage.In the method for welding that the heated object constituted using the electric power supplied from high frequency electric source (6) to soldering with load coil (10) to being engaged upper metal pipe (1) with lower metal pipe (2) using annular scolding tin (3) is heated, after detecting that melting has occurred in annular scolding tin (3), the variation for detecting the load impedance of heated object (4), is automatically stopped the electric power supplied from high frequency electric source (6) to soldering load coil (10).
Description
Technical field
The present invention relates to the method for welding being brazed each other to metal tube.
Background technology
The heat exchanger for being used in the air-conditioning equipments such as air regulator applies soldering in the mutual connection of metal tube.Metal
Heating part near joint portion is heated to brazing filler metal fusing point by the soldering of pipe later by configuring solder at the joint portion of metal tube
More than, so that the solder of melting is spread all over joint portion entirety, to realize.In order to there is no void, infiltration it is insufficient, do not melt
Melt and the problems such as insufficient fill in the case of carry out the soldering of high-quality, be not only solder, it is also necessary to which control includes joint portion
The temperature of heating part entirety including neighbouring metal tube.As the construction method of condition as satisfaction, enumerates and use
It can carry out the induction brazing of high-precision temperature controlled induction heating technique.
In the past, as the method being brazed each other to metal tube using sensing heating, there are as below methods：Temperature will be utilized
Measurement means input to detect temperature information obtained from the temperature near joint portion as feedback information, are based on feedback information
Deviation between target temperature information is by high frequency power supply to heating coil (referring for example to patent document 1).
Figure 11 is the figure for indicating the previous method for welding fed back to temperature information recorded in patent document 1.
At the soldering places 107 of axial length metallic conductor 105 and perimeter metallic conductor 106, by infrared emission thermometer
101 temperature detection informations measured are input into sequencer 104 and high-frequency heating power circuit 100.Then, be based on by
The deviation for the target temperature and temperature detection information that high-frequency heating temperature setting device 102 is set, by high-frequency heating power circuit 100
To 103 supply high frequency electric power of high-frequency heating inductor to providing the holding time.Later, if reaching the regulation holding time of setting,
The supply for then stopping the RF power from high-frequency heating power circuit 100 for high-frequency heating inductor 103, completes pricker
Weldering.
Citation
Patent document
Patent document 1：No. 4407276 bulletin of JP patents
But by temperature of the infrared emission thermometer 101 to measure heating part, with the temperature of heating part
Degree rises, only can not by temperature due to the influence (such as the case where reflectivity high material) of the surface state of heated object
Accurately the completion of soldering is managed.
In addition, using completion of both temperature and times to manage soldering, if due to metal tube or pricker
The shape of material or the deviation for assembling relative position, the supply for carrying out time-based consistent RF power stop, then can produce
The qualities such as the melting and breakage for not melting, permeating deficiency and metal tube of raw solder are bad.
Invention content
Therefore, it is an object of the present invention to solve described problem, a kind of pricker when can prevent induction brazing is provided
Material does not melt, permeates the undesirable method for welding of quality as insufficient and metal tube melting and breakage.
In order to reach the purpose, the method for welding that of the invention 1 mode is related to is using from high frequency electric source to soldering
It is constituted with the electric power of load coil supply to being engaged upper metal pipe with lower metal pipe using annular scolding tin
The method for welding that is heated of heated object, in the method for welding, after detecting that melting has occurred in the annular scolding tin,
The load impedance of the heated object between the high frequency electric source and the heated object is detected by load impedance test section
Variation then stop supply of the electric power from the high frequency electric source to the soldering load coil.
Invention effect
As above, the method for welding involved by mode according to the present invention, independent of radiation thermometer
Temperature or time management, but sentenced by the detection of the variation of the load impedance of heated object after the melting detection of annular scolding tin
Fixed soldering is completed, and the supply of the electric power supplied with load coil from high frequency electric source to soldering is stopped.It is constituted due in this way,
So not melting, permeating insufficient and metal tube melting and breakage in this way for solder when induction brazing can be prevented
Quality it is bad.
Description of the drawings
Fig. 1 is the soldering composition figure of the method for welding of embodiment for carrying out the present invention.
Fig. 2 is the sectional view of each process for the method for welding for indicating embodiments of the present invention.
Fig. 3 is the practical measured waveform figure of soldering of the method for welding of embodiments of the present invention.
Fig. 4 is the composition figure of the high frequency electric source for the method for welding for being used in embodiments of the present invention.
Fig. 5 A are the heating rate and frequency change point overhaul flow chart of the method for welding of embodiments of the present invention.
Fig. 5 B are heating rate and the inspection of frequency change point of the method for welding of the embodiments of the present invention after Fig. 5 A
Flow gauge figure.
Fig. 6 is the infrared emission temperature measurement fixed range verification position for the method for welding for indicating embodiments of the present invention
The figure set.
Fig. 7 A are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 30 of+2mm
Figure.
Fig. 7 B are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 31 of+4mm
Figure.
Fig. 7 C are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 32 of+5mm
Figure.
Fig. 8 A are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 33 of -1mm
Figure.
Fig. 8 B are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 34 of -3mm
Figure.
Fig. 8 C are the actual measurement datas indicated from the lower metal pipe upper end of heated object at the position 35 of -6mm
Figure.
Fig. 9 is that soldering in the case of Proximity Sensor is used to constitute in the method for welding of embodiments of the present invention
Figure.
Figure 10 A are in the method for welding indicated in embodiments of the present invention using in the case of Proximity Sensor
The figure to locate when annular scolding tin does not melt.
Figure 10 B are rings in the case of indicating to use Proximity Sensor in the method for welding of embodiments of the present invention
The figure to locate when shape scolding tin melts.
Figure 11 is the soldering composition figure of conventional example.
Specific implementation mode
Hereinafter, being explained with reference to embodiments of the present invention.
In addition, it is following situations that such high-precision temperature control, which especially becomes project,：Despite solder and metal tube
Between the smaller material of fusing point difference, but be brazed in short time with the heating rate of high speed.For example, the material of heated object
The case where aluminium is used in material is compared with when using other metals in the material in heated object, temperature range that when soldering should control
It is relatively narrow.The fusing point of aluminium is 660 DEG C, such case compared with 1083 DEG C of the fusing point of the copper used in the material of common metal pipe,
It is low very significantly.Since the fusing point of solder is 580 DEG C, so in order to be brazed in the case of the rupture of not pipe,
It asks and the heating part of heated object is controlled temperature in 580 DEG C or more 660 DEG C narrow ranges (the 1/4 of copper) below.Therefore, exist
In embodiment below, the difficult aluminium of soldering is set as to the material of metal tube.
Fig. 1 is the soldering composition figure of the method for welding of an embodiment for carrying out the present invention.
In Fig. 1, heated object 4 by upper metal pipe 1, lower metal pipe 2, using joint portion 4a by upper metal pipe 1
The annular scolding tin 3 engaged with lower metal pipe 2 is constituted.Joint portion 4a is to engage upper metal pipe 1 with lower metal pipe 2
Part, be the part of the solder of the annular scolding tin of configuration 3.
As the brazing device of the soldering of heated object 4 as progress, by high frequency electric source 6, controller 7, heating coil
10, it is constituted as the radiation thermometer 9 and load impedance test section 8 of an example of melting detection sensor.
It radiates the measuring temperature of the temperature measuring position 5 on the detection heated object 4 of thermometer 9 and is exported to controller 7.
High frequency electric source 6 according to the control of controller 7 come to 10 supply high frequency electric power of heating coil, it is right using heating coil 10
The joint portion 4a of heated object 4 carries out high-frequency heating to be brazed.
Heating coil 10 is disposed near the joint portion 4a of heated object 4, and magnetic field is generated by using RF power, from
And heated object 4 is made to generate eddy current, joint portion 4a is heated using Joule heat.
Load impedance test section 8 is disposed between high frequency electric source 6 and heating coil 10, detect the variation of load impedance and to
Controller 7 exports.
Controller 7 according to from radiation thermometer 9 export heated object 4 on temperature measuring position 5 measuring temperature and
By the variation for the load impedance that the load impedance test section 8 being disposed between high frequency electric source 6 and heating coil 10 detects, to control
High frequency electric source 6.As a result, specifically, the details of controller 7 is as described later, at least has：Control unit 7k, heating rate
Maximum point test section (annular scolding tin melting test section) 7A, frequency change point test section (load impedance change point test section) 7B.
Then, in the present embodiment, based on the measuring temperature exported from radiation thermometer 9, by heating rate maximum point test section 7A
To detect heating rate maximum point 19.In addition, the variation based on the load impedance detected by load impedance test section 8, by frequency
Change point test section 7B detects frequency change point 15.The information of measuring temperature that control unit 7k will be exported from radiation thermometer 9
It is inputted respectively with the information of the load impedance detected by load impedance test section 8, these information is respectively outputted to heating rate
Maximum point test section 7A and frequency change point test section 7B is controlled to carry out defined operation and judgement respectively.This
Outside, control unit 7k is based on the heating in the heating rate maximum point test section 7A as these operations and the result information of judgement
The information of the testing result of speed maximum point 19 and the testing result of the frequency change point 15 in frequency change point test section 7B
Information, to control high frequency electric source 6.
In addition, load impedance test section 8 is not limited to be arranged in the outside of high frequency electric source 6, can also be arranged in high-frequency electrical
The inside in source 6 is detected.In addition, the high frequency being described in detail later in the present embodiment may be used in load impedance test section 8
The output frequency waveform of power source internal, to detect the variation of load impedance.
The brazing process of heated object 4 is described in detail using Fig. 2.
(a) of Fig. 2~(d) be the method for welding for indicating the present embodiment of the present invention the 1st process~the 4th process cut open
Face figure.
The 1st process (a) of Fig. 2 is to indicate from high frequency electric source 6 to 10 supply high frequency electric power of heating coil, is to indicate that soldering is opened
Sectional view during beginning with flux activity.In this process, the temperature rise of adjoint heated object 4, annular scolding tin 3
Activation (for example, reaching 410 DEG C~510 DEG C of activated temperature) occurs for the scaling powder in solder.At this point, upper metal pipe 1, under
Portion's metal tube 2, annular scolding tin 3 exist with monomer respectively, are in 4 processes in the state of substantially insulating at electrical aspect
The highest state of load impedance.In addition, in the figure of the 1st process (a) of Fig. 2,3 complete painted black of annular scolding tin is shown.
Later, the 2nd process (b) of Fig. 2 is to indicate solder melting and the sectional view during permeating.In this process, example
Such as, in the case where the temperature of annular scolding tin 3 reaches fusing point i.e. 580 DEG C or more of annular scolding tin 3, the ring of an example as solder
Shape scolding tin 3 melts, and upper metal pipe 1 and lower metal pipe 2 are near the upper end 2a of lower metal pipe 2, via annular
Scolding tin 3 transmits heat, and also starts electric conducting state.In addition, in the figure of the 2nd process (b) of Fig. 2, by the annular of melting
3 complete painted black of scolding tin is classified to show the part of infiltration beginning.Load impedance in 2nd process is than the 1st process
It is low.
Later, the 3rd process (c) of Fig. 2 is the sectional view during indicating solder infiltration.In this process, the annular of melting
Scolding tin 3 penetrates into the gap between upper metal pipe 1 and lower metal pipe 2, upper metal pipe 1, lower metal pipe 2, annular welds
The heat transfer of tin 3 conducts also excellentization to upper metal pipe 1 and lower metal pipe 2 with temperature rise, so load
The 2nd process of impedance ratio reduces.In addition, in the figure of the 3rd process (c) of Fig. 2, the annular scolding tin 3 permeated after melting is complete
Painted black is shown.
Later, the 4th process (d) of Fig. 2 is the sectional view during indicating soldering completion.In this process, to annular scolding tin 3
Upper metal pipe 1 and lower metal pipe 2 between the infiltration in gap reach the lower end 1a of upper metal pipe 1, upper metal pipe 1
Most excellentization is conducted with lower metal pipe 2, load impedance becomes minimum in 4 processes.In the 4th process (d) of Fig. 2
In figure, also the 3 complete painted black of annular scolding tin permeated after melting is shown.
Then, using the practical measured waveform figure of soldering of the present embodiment of the present invention of Fig. 3, to illustrate brazing process.
The longitudinal axis in the left side of Fig. 3 indicates the temperature of the temperature measuring position 5 on the upper metal pipe 1 measured by radiation thermometer 9.It is left
The longitudinal axis of side indicates the frequency detected by load impedance test section 8.Horizontal axis indicates minute or the load of radiation thermometer 9
The detection time of impedance detection section 8.
In figure 3,11 the 1st process (a) for being equivalent to Fig. 2 during soldering starts with flux activity.Solder melts
The 2nd process (b) and the 3rd process (c) for being equivalent to Fig. 2 with during infiltration 12.13 are equivalent to the of Fig. 2 during soldering is completed
4 processes (d).In addition, the frequency waveform 14 of Fig. 3 is the curve graph of the frequency and time that are detected by load impedance test section 8.Temperature
Degree waveform 16 and temperature change point 17 are by radiation thermometer 9 (200 DEG C~1500 DEG C of temperature range of detection) in upper metal pipe 1
On the curve graph of temperature and time that is measured to of temperature measuring position 5 and the temperature change point 17 in the curve graph.Heating
Velocity wave form 18, heating rate maximum point 19 and frequency change point 15 are according to of the invention shown in aftermentioned Fig. 5 A and Fig. 5 B
Present embodiment in heating rate and frequency change point overhaul flow chart, automatically detected by controller 7.Heating
Velocity wave form 18 is calculated based on the information of the temperature information exported by radiation thermometer 9 and the minute of radiation thermometer 9
Heating rate simultaneously forms waveform.Specifically, the difference between preceding 1 temperature information and Current Temperatures information is taken, when with measuring
Between (sampling time) remove, seek heating rate.
In 11 during the soldering beginning of Fig. 3 and flux activity, frequency waveform 14 is from high frequency electric source 6 to heating
It is 268.6kHz and flat waveform in addition during back to back rising after coil 10 supplies electric power.In addition, temperature waveform 16
Gradient is also fixed, and heating rate waveform 18 becomes substantially 0 and flat waveform.
Solder melt with permeate during 12 in, along with annular scolding tin 3 heat transfer to top metal tube 1 and under
Portion's metal tube 2 is to temperature rise, gradient, that is, heating rate such as heating rate of temperature waveform 16 at temperature change point 17
Waveform 18 is changed in this way, maximum value occurs in heating rate maximum point 19.
Later, 13 during being brazed completion, most excellentization that conduct of upper metal pipe 1 and lower metal pipe 2, load resistance
Resist becomes minimum in 4 processes.At this point, the frequency of occurrences change point 15 in frequency waveform 14.
In this way, detecting heating rate maximum point 19 by controller 7, frequency change point 15 is detected by controller 7, to
Automatically judge that soldering is completed by controller 7, it will be from high frequency electric source 6 to soldering sensing heating from the control unit 7k of controller 7
The electric power of coil supply stops supply, thus can prevent not the melting of solder, permeate deficiency and metal tube melting and
Quality as breakage is bad.In addition, detection heating rate maximum point 19, which means that detection annular scolding tin 3 has occurred, melts this
One situation.In addition, detection frequency change point 15 means the variation of the load impedance of detection heated object 4.These heating speed
The details for spending the detection method of maximum point 19 and frequency change point 15 is aftermentioned.
Here, it describes in detail in the frequency waveform 14 of Fig. 3 the phenomenon that frequency of occurrences change point 15.The power supply unit 20 of Fig. 4
It is the Inner Constitution of the high frequency electric source 6 of Fig. 1 with the generally constituting using the high frequency electric source used in soldering of match circuit portion 21
Figure.
The load circuit 22 being made of heating coil 10 and heated object 4 is because construction, configuration, material or temperature etc. are various
Condition and change, so must so that the variation with the i.e. load impedance of variation of load circuit 22 matches.And if taking
Be loaded with correspondingly makes frequency automatically change to change matching condition at every moment changed load impedance
Auto-matching (automatic matching) power supply, then sometimes also in advance consider load impedance variation range, to make
At being capable of circuit corresponding with the matching range of the mode or certain degree that switch over by stages.In the present embodiment,
Match circuit portion is constituted in the way of having heating coil 10, resonant capacitor, output transformer, high-frequency current detector
21.According to such match circuit portion 21, can carry out correspondingly making frequency automatic with the load impedance in load circuit 22
Ground changes to change the Auto-matching (automatic matching) of matching condition.It is filled in the soldering of present embodiment
Set it is middle using the power supply for being equipped with such Auto-matching, as long as the unconverted common state of load impedance, then with heating
The impedance of coil 10 is exactly cooperatively that the variation of the frequency under Auto-matching is stablized to the result after frequency progress Auto-matching
Ground occurs.It is changed according to the state of heated object 4 due to load impedance in heating, so Auto-matching function acts as
With frequency changes.The frequency of occurrences change point 15 in the frequency waveform 14 of Fig. 3 as a result,.
In addition, here, the heating rate maximum point 19 and frequency change point 15 of Fig. 3 based on controller 7 are in detail described
Detection method.
Fig. 5 A and Fig. 5 B are the figures for the testing process for indicating heating rate maximum point 19 and frequency change point 15.This flow
It is acted by the program in the sequencer of the controller 7 of Fig. 1.
First, in step S000, operation start signal is received from the input/output port I/O of controller 7, starts to transport
Turn.That is, under the control of controller 7, supplied electric power from high frequency electric source 6 to soldering load coil 10.
Then, it in step S001, is waited until from operation start by the parameter T0 times.Passing through the parameter T0 times
Afterwards, in step S002, also and band will make to obtain after the analog signal progress AD transformation for radiating thermometer 9 in controller 7
The noise remove of the temperature data arrived calculates 10 moving averages by the 1st operational part 7a of controller 7.
Then, in step S003, in the 2nd operational part 7b of controller 7, the difference of moving average is taken, to calculate
Heating rate.
Then, in step S004, in order to improve in step S003 by the 2nd calculated moving averages of operational part 7b
The sensitivity of difference this is being determined as by the 1st determination unit 7d of controller 7 by the 3rd operational part 7c of controller 7 Lai square
In the case that square value is threshold parameter Tth or more, in step S005, calculated by the 4th operational part 7e of controller 7 current
The difference of value and preceding 1 data.The case where being determined as square value deficiency threshold parameter Tth by the 1st determination unit 7d of controller 7
Under, return to step S002.
Then, it in step S006, is monitored in step S005 by the 4th operational part by the 2nd determination unit 7f of controller 7
Whether continuous 3 times of the difference value that 7e is sought becomes 0 or less.
Then, in step S007, it is judged to becoming 0 feelings below continuous 3 times by the 2nd determination unit 7f in step S006
Under condition, heating rate maximum point 19 is determined as by the 2nd determination unit 7f.It is determined as continuous 3 by the 2nd determination unit 7f in step S006
It is secondary more than 0 in the case of, return to step S002.
Step S002~step S007 so far is the judgment process of heating rate maximum point 19, by the 1st operational part
7a, the 2nd operational part 7b, the 3rd operational part 7c, the 1st determination unit 7d, the 4th operational part 7e, the 2nd determination unit 7f constitute heating rate
Maximum point test section (annular scolding tin melting test section) 7A.
Then, after determined heating rate maximum point 19 by the 2nd determination unit 7f in step S007, in step S010,
Also and band will carry out temperature data obtained from AD transformation in controller 7 to the frequency analog signal from high frequency electric source 6
Noise remove calculates 10 moving averages by the 1st operational part 7a.
Then, in step S011, the difference of moving average is taken by the 2nd operational part 7b of controller 7, to calculate frequency
Change speed.
Then, in step S012, in order to improve in step S011 by the 2nd calculated moving averages of operational part 7b
Difference sensitivity, and be determined as by the 3rd determination unit 7g of controller 7 Lai square by the 3rd operational part 7c of controller 7
In the case that the square value is threshold parameter Fth or more, in step S013, worked as to calculate by the 5th operational part 7h of controller 7
The difference of preceding value and preceding 1 data.In the case where being determined as square value deficiency threshold parameter Fth by the 3rd determination unit 7g, return
To step S010.
Then, it in step S014, is monitored in step S013 by the 5th operational part by the 4th determination unit 7i of controller 7
Whether continuous 3 times of the difference value that 7h is sought becomes 0 or less.
Then, in step S015, it is judged to becoming 0 feelings below continuous 3 times by the 4th determination unit 7i in step S014
Under condition, frequency change point 15 is determined as by the 4th determination unit 7i, it will be from high frequency electric source 6 to pricker from control unit 7k in step S016
The electric power that weldering load coil supplies stops supply.It is judged to being more than for continuous 3 times by the 4th determination unit 7i in step S014
In the case of 0, step S010 is returned to.
Step S010~step S015 so far is the judgment process of frequency change point 15, by the 1st operational part 7a,
2 operational part 7b, the 3rd operational part 7c, the 3rd determination unit 7g, the 5th operational part 7h, the 4th determination unit 7i detect to constitute frequency change point
Portion (the change point test section of load impedance) 7B.
In addition, in the present embodiment, although since the sampling time is 10ms, so as moving average, being set as 10
It is a, and be set as continuous 3 times in change point extraction, but it is to rely on the calculation processing power of controller, memory capacity, journey
Sequence capacity etc. or system are constituted, and are not particularly limited as these numbers or number.
In this way, detecting heating rate maximum point 19 by controller 7, frequency change point 15 is detected by controller 7, to
Automatically judge that soldering is completed by controller 7, it will be from high frequency electric source 6 to soldering sensing heating from the control unit 7k of controller 7
The electric power of coil supply automatically stops supplying.But since the heat of metal tube 1,2 is transmitted, according to the temperature measuring position in Fig. 1
5 are set, the detection of heating rate maximum point 19 is possible to be unable to catch up with the detection of frequency change point 15.Therefore, the temperature in Fig. 1 is described
Locate 5 the possible range of measurement.
As temperature measuring position 5, as shown in fig. 6, heated object 4 central shaft (axis direction of upper metal pipe 1 or
The axis direction of lower metal pipe 2) on 4b, the position of+2mm from the upper end 2b of lower metal pipe 2 is set as to the position of heated object 4
30 are set, the position of+4mm is set as to the position 31 of heated object 4, the position of+5mm is set as to the position 32 of heated object 4.This
Outside, the position of -1mm is set as to the position 33 of heated object 4, the position of -3mm is set as to the position 34 of heated object 4, by -6mm
Position be set as the position 35 of heated object 4
Fig. 7 A are the figures of the actual measurement data at the position 30 for the heated object 4 for indicating+2mm.Detecting heating speed
After spending maximum point 19, detection frequency change point 15 can carry out the judgement of soldering completion.
Fig. 7 B are the figures of the actual measurement data at the position 31 for the heated object 4 for indicating+4mm.In the same manner as Fig. 7 A,
After detecting heating rate maximum point 19, detection frequency change point 15 can carry out the judgement of soldering completion.
Fig. 7 C are the figures of the actual measurement data at the position 32 for the heated object 4 for indicating+5mm.This and Fig. 7 A and figure
7B is different, and the detection of heating rate maximum point 19 and the substantially identical timing of the detection of frequency change point 15 cannot be brazed
The judgement of completion.
In addition, Fig. 8 A are the figures of the actual measurement data at the position 33 for the heated object 4 for indicating -1mm.The situation is,
After detecting heating rate maximum point 19, detection frequency change point 15 can carry out the judgement of soldering completion.
Fig. 8 B are the figures of the actual measurement data at the position 34 for the heated object 4 for indicating -3mm.In the same manner as Fig. 8 A,
After detecting heating rate maximum point 19, detection frequency change point 15 can carry out the judgement of soldering completion.
Fig. 8 C are the figures of the actual measurement data at the position 35 for the heated object 4 for indicating -6mm.This and Fig. 8 A and figure
8B is different, and the detection of heating rate maximum point 19 and the substantially identical timing of the detection of frequency change point 15 cannot be brazed
The judgement of completion.
Therefore, as the temperature measuring position 5 of heated object 4, range that the possibility of the temperature of heated object 4 measures can be with
Say it is the axially+4mm or less and axially downwards within -5mm upwards from the upper end 2b of lower metal pipe 2.
Radiation thermometer is used according in the melting detection of method for welding and annular scolding tin 3 involved by present embodiment
9 composition, independent of radiation thermometer 9 absolute temperature or time management can carry out soldering completion judgement, by by
The control unit 7k of controller 7 automatically to stop supplying by the electric power supplied from high frequency electric source 6 to soldering load coil,
To obtain preventing not the melting of solder when induction brazing, permeate insufficient and metal tube melting and it is damaged in this way
The undesirable effect of quality.
In addition, the present invention is not limited to the embodiment, can be implemented with various other ways.For example, in this reality
It applies in mode, as the melting detection sensor that detection annular scolding tin 3 is melted, describes using radiation thermometer 9
Method, but as the other examples of melting detection sensor, can also be set as detecting the sensing of the change in shape of annular scolding tin 3
Device.That is, the sensor of the change in shape as the annular scolding tin of detection 3, for example, can also be optical reflective type, infiltration type is non-connects
Touch sensor or image procossing based on video camera or capacitance type noncontacting proximity sensor etc..
The shadow of surface state of the optical profile type non-contact sensor with the temperature rise of joint portion 4a and by heated object 4
It rings, but having can carry out detecting such feature over long distances.Although in addition, based on the image procossing of video camera by solder
Flux activity when white cigarette influence, but the high visual field and the such feature of fine detection can be carried out by having.
In variation below, surface state by heated object 4 will be difficult to describe with reference to Fig. 9~Figure 10 B
It influences and the capacitance type noncontacting proximity sensor of the influence of the white cigarette of scaling powder is as the another of melting detection sensor
Example is come the case where application.
Although annular scolding tin 3 is by the Lip river generated by the electric power supplied from high frequency electric source 6 to soldering with load coil
Lun Zili influences to be condition this case that without vibration, but radiates thermometer 9 as shown in figure 9, can also replace, and
Using the contactless Proximity Sensor of capacitance type 40 as another example of melting detection sensor, to detect annular welds
The melting of tin 3.
The contactless Proximity Sensor of capacitance type 40 is oppositely disposed with joint portion 4a, according to the change of electrostatic capacitance
Change and carrys out the presence of detection object and close to (having=ON) and leave the mode of change in location as (nothing=OFF).
As shown in Figure 10 A, in the case where annular scolding tin 3 does not melt, due in the contactless short distance of capacitance type
Sensor 40 locates 41 or 42, there are annular scolding tin 3, so the contactless Proximity Sensor of capacitance type 40
It is output into ON.
Later, annular scolding tin 3 is heated, as shown in Figure 10 B, melting occurs in annular scolding tin 3 and penetrates into upper metal
In the case of the gap of pipe 1 and lower metal pipe 2, due in the measurement position of the contactless Proximity Sensor of capacitance type 40
41 or 42 are set, there is no annular scolding tin 3, so the contactless Proximity Sensor of capacitance type 40 is output into OFF.
Therefore, during solder melts and permeates, the output of the contactless Proximity Sensor of capacitance type 40 from
ON changes to OFF, and later, detection frequency change point 15, judgement soldering is completed, and exporting soldering to high frequency electric source 6 completes signal, from
And automatically RF power can be stopped supplying to the supply of heating coil 10 in the same manner as previous embodiment, heated object
4 soldering is completed.
What is be related to according to this modification connects in the melting detection of method for welding and annular scolding tin 3 using capacitance type is non-
The composition of touch Proximity Sensor 40, the absolute temperature independent of radiation thermometer 9 or time management, it will be able to carry out pricker
The judgement being soldered automatically will stop supply from high frequency electric source 6 to soldering with the electric power that load coil supplies, so as to
Access not melting, permeating as insufficient and metal tube melting and breakage for solder when preventing induction brazing
The undesirable effect of quality.
In addition, the brazing device for implementing the method for welding that the embodiment is related to has：To utilizing annular scolding tin 3
The soldering load coil that the heated object 4 that upper metal pipe 1 and the engagement of lower metal pipe 2 are constituted heats
10；
The high frequency electric source 6 that the soldering load coil 10 is supplied electric power；
Detect the variation of the load impedance of the heated object 4 between the high frequency electric source 6 and the heated object 4
Load impedance test section 8；And
After detecting that melting has occurred in the annular scolding tin 3, described added, is detected by the load impedance test section 8
After the variation of the load impedance of hot body 4, stop the electric power from the high frequency electric source 6 to the soldering sensing heating line
The controller 7 (control unit 7k) of the supply of circle 10.
Also, it in more detail, is melted to detect the annular scolding tin 3, is detected by heating rate maximum point
Portion (annular scolding tin melting test section) 7A detects heating rate maximum point 19, and in order to detect the change of the load impedance
Change, frequency change point 15 is detected by frequency change point test section (load impedance change point test section) 7B.
In such a device, the function and effect that the method for welding is related to can also be played.
In addition, by suitably by the arbitrary embodiment or variation among the various embodiment or variations into
Row combination, so as to play respectively possessed effect.Furthermore it is possible to carry out embodiment combination with one another or embodiment that
This combination or the combination of embodiment and embodiment, and can also carry out the spy among different embodiment or embodiment
Levy combination with one another.
Industrial Availability
The method for welding that the mode of the present invention is related to is in the absolute temperature or time pipe independent of radiation thermometer
Judgement soldering is completed in the case of reason, and the electric power supplied from high frequency electric source to soldering load coil is stopped supplying,
To have the melting for not melting, permeating deficiency and metal tube for preventing solder when induction brazing and breakage in this way
The undesirable effect of quality, can be applied to the pricker of the metal tube of the heat exchanger used in air regulator or freezer etc.
Weld purposes.
Symbol description
1 upper metal pipe
The lower ends 1a
2 lower metal pipes
The upper ends 2a
The upper ends 2b
3 annular scolding tin
4 heated objects
The joint portions 4a
4b central shafts
5 temperature measuring positions
6 high frequency electric sources
7 controllers
7A heating rate maximum points test section (annular scolding tin melting test section)
7B frequency change points test section (load impedance change point test section)
The 1st operational parts of 7a
The 2nd operational parts of 7b
The 3rd operational parts of 7c
The 1st determination units of 7d
The 4th operational parts of 7e
The 2nd determination units of 7f
The 3rd determination units of 7g
The 5th operational parts of 7h
The 4th determination units of 7i
7k control units
8 load impedance test sections
9 radiation thermometers
10 heating coils
During 11 soldering beginnings and flux activity
During 12 solders are melted and are permeated
During 13 solderings are completed
14 frequency waveforms
15 frequency change points
16 temperature waveforms
17 temperature change points
18 heating rate waveforms
19 heating rate maximum points
20 power supply units
21 match circuit portions
22 load circuits
30 from the lower metal pipe upper end of heated object+2mm position
31 from the lower metal pipe upper end of heated object+4mm position
32 from the lower metal pipe upper end of heated object+5mm position
33 from the lower metal pipe upper end of heated object -1mm position
34 from the lower metal pipe upper end of heated object -3mm position
35 from the lower metal pipe upper end of heated object -6mm position
The contactless Proximity Sensor of 40 capacitance types
41,42 locate
100 high-frequency heating power circuits
101 infrared emission thermometers
102 high-frequency heating temperature setting devices
103 high-frequency heating inductors
104 sequencers
105 axial length metallic conductors
106 perimeter metallic conductors
107 soldering places
Claims (1)
1. a kind of method for welding, using the electric power supplied with load coil from high frequency electric source to soldering come to using annular welds
Tin heats upper metal pipe with the heated object that lower metal pipe is engaged and constituted, in the method for welding,
After detecting that melting has occurred in the annular scolding tin, detected by load impedance test section the high frequency electric source with it is described
The variation of the load impedance of the heated object between heated object,
Then, stop supply of the electric power from the high frequency electric source to the soldering load coil,
The detection that the annular scolding tin is melted is detected according to the variation of the heating rate of the heated object,
The temperature measuring position for detecting the variation of the heating rate is from the upper end of the lower metal pipe along the top
The upward 4mm or less of axis direction of metal tube and from the upper end of the lower metal pipe along the axis side of the lower metal pipe
Position within downward 5mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-226726 | 2015-11-19 | ||
| JP2015226726A JP6366020B2 (en) | 2015-11-19 | 2015-11-19 | Brazing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106735664A CN106735664A (en) | 2017-05-31 |
| CN106735664B true CN106735664B (en) | 2018-11-09 |
Family
ID=58803312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610842571.9A Expired - Fee Related CN106735664B (en) | 2015-11-19 | 2016-09-22 | Method for welding |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6366020B2 (en) |
| CN (1) | CN106735664B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108672872B (en) * | 2018-08-02 | 2024-04-16 | 长虹美菱股份有限公司 | Inductor for high-frequency composite induction brazing |
| CN113351952B (en) * | 2021-06-24 | 2022-08-30 | 贵州黎阳国际制造有限公司 | Butt brazing method for valvable alloy and copper |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104002008A (en) * | 2014-05-08 | 2014-08-27 | 珠海格力电器股份有限公司 | Induction soldering device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4683361A (en) * | 1985-04-04 | 1987-07-28 | Westinghouse Electric Corp. | Brazing apparatus having a dual function heating and eddy current probe coil |
| JP2007294485A (en) * | 2006-04-20 | 2007-11-08 | Toyota Motor Corp | Soldering method and equipment |
| JP2010247180A (en) * | 2009-04-15 | 2010-11-04 | Mitsubishi Electric Corp | Brazing apparatus and brazing method using the same |
| JP2011025249A (en) * | 2009-07-21 | 2011-02-10 | Seidensha Electronics Co Ltd | Method and apparatus for high-frequency induction heating brazing |
-
2015
- 2015-11-19 JP JP2015226726A patent/JP6366020B2/en not_active Expired - Fee Related
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2016
- 2016-09-22 CN CN201610842571.9A patent/CN106735664B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104002008A (en) * | 2014-05-08 | 2014-08-27 | 珠海格力电器股份有限公司 | Induction soldering device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106735664A (en) | 2017-05-31 |
| JP2017094346A (en) | 2017-06-01 |
| JP6366020B2 (en) | 2018-08-01 |
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