Perforative plasma the frit of arc solder is deep detect

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  • source:FINKEL CNC Machining
Summary: In alveolus plasma arc solders in the process, use scabbard layer voltage to learn character of plasma cloud eject first, learn frit difficult situation thereby. From consider to stay in real time to detect only before the state information with whether penetrable alveolus, advancement arrives to detect through horn of plasma cloud eject the position with bath late frit. Designed passive bougie to detect plasma cloud device, this device is simple, reliable, have better industrial application prospect. Keyword: Alveolus; Plasma arc solder; Scabbard layer voltage; Arc solder has alveolus of frit deep preface plasma concentration of hot input energy, welding line is dark wide than big, solder efficiency is tall and can be in in solder comes true to appear when makings of thick canal, plank solders, bosseyed solder is double-faced the characteristic such as figuration. But of alveolus do not make plasma arc solder cannot obtain good welding line figuration firmly surely, restricted the wide application of plasma arc solder greatly. Control, alveolus is appeared to command a respect in plasma arc frit, already began much research domestic and internationally, put forward a variety of alveolus behavior early or late detect method, picture signal of signal of intensity of arc of voltage of the blaze that be like end, electric arc, sound, bath, much pass feeling information confluence to wait, obtained a lot of positive result, but the information that these methods can provide alveolus to whether penetrate only, and cannot enough or cannot reflect the condition with bath deep frit well and truly, also put in certain limitation in applying actually. Accordingly, development is simple, practical, reliable and the plasma arc frit of low cost controls sensor fully, become plasma arc frit to control the problem that solves urgently fully. This research uses scabbard layer voltage to learn character of plasma cloud eject first, learn the case that frit deep frit shows, solder for plasma arc thereby quality control offerred new research way. 1 plasma cloud and its configuration change are alleged plasma cloud, solder in plasma arc namely in the process, as a result of the energy height concentration of plasma arc, density velocity of flow of tall, blaze spends big, temperature big, inside plasma arc and metallic action area, the metal evaporates very acuteness, steam of formation high temperature metal and solder protective gas produces dissociation below electric arc action, should solder when alveolus was not formed, soldering the rear of plasma arc (as contrary as direction of welding) appear the small arc that one each bath shoots, its appearance resembles a wing, accordingly, say it is arc empennage or plasma arc becomes warped instead or plasma cloud. In document [in 5] , introduced alveolus to form the change with configuration of the electric arc when closing in detail. Alveolus from do not have have, plasma cloud also finishs to be placed periodicly become warped, form in alveolus namely before, as solder of the process undertake, perhaps say, as solder the accretion with deep frit, the included angle θ between plasma cloud and workpiece surface also increases gradually. When alveolus is about to form, θ of its included angle reachs maximum, after this, plasma cloud is rapid lap, in workpiece the reverse side end blaze appears, namely alveolus is formed. That is to say, should solder after alveolus is formed, from solder bath front cannot have seen electric arc plasma the cloud, perhaps place on plasma cloud very small. Accordingly, electric arc plasma the configuration of the cloud is OK token solders bath alveolus or the diagnostic news with late frit. 2 tests system and conditional test system are the TG300P power supply that manufactures by Malaysia, the PWM300 that Thermal Dynamics company produces is special plasma arc welding torch, PLC undertakes automata implement, circular refrigeration system, bougie detects device, the composition such as the memorial oscillograph S4622A that Malaysia Agilent company produces. The welding torch when soldering is fixed do not move, bougie position is fixed also, the car drives workpiece to move. Bougie detects device principle, capacitance is 0.

01 μ F, resistor is 9M Ω . Solder material is 45* mild steel, memorial oscillograph S4622A records case of change of scabbard layer voltage, workpiece receives oscillograph to be being carried, bougie receives oscillograph to lose end. Through detecting the voltage signal in circuit can detect the diagnostic information of plasma cloud, get the diagnostic behavior information of horn of plasma cloud eject thereby, get the information with horn of plasma cloud eject and bath deep frit finally. 3 bougie detect principle bougie detects was to use theory of plasma scabbard layer actually. In alleged plasma " scabbard layer " academic, become namely when a cold object immerge plasma, plasma shows as disparate as common gas nature, if object surface is,do not shoot ion or absorb ion, enter plasma in the object hind, object surface forms a belt to lose the layer shady area of potential, this layer is called " scabbard layer " , it parts plasma and object. In this one area, the electron is counted and ionic number is different, apparent deviate is electrically neutral, its potential also is drab increase by degrees. Use bougie to detect when plasma cloud, be in inserting bougie plasma, because workpiece is reference " the ground " potential, accordingly, can detect between bougie and workpiece one negaive electricity controls a cost, this voltage is his namely " scabbard layer voltage " , this detects in passive bougie namely in the law need not the reason of extra power supply. Of angle of fire of 4 plasma cloud gush detect detect without bougie of extra power supply the purpose of plasma cloud basically is for the frit that to alveolus plasma arc solders fully frit is deep undertake controlling. In a certain given solder below electric current, move bougie to plasma cloud center gradually from far. The scabbard layer voltage that bougie detects is apart from plasma cloud center to reduce and increase of the distance ceaselessly as bougie, obtain position of plasma cloud center when bougie (C is nodded) when, scabbard layer voltage is the biggest, nodding C and O of electric arc center to connect the included angle θ between line and workpiece at this moment is to give solder the angle of fire of plasma cloud gush below electric current. The length on the length on the X way that measures C giving a point and Y direction, can beg a corresponding plasma cloud gush to shoot horny θ . Show control to undertake frit reachs frit greatly soldering, still need to know this solders the frit of voltaic place correspondence is deep. Such, ability finds out the relationship with horn of plasma cloud eject and close frit, realize frit to show control thereby. Different solder the welding line incision below electric current measures his respectively frit is deep, can know the relationship with horn of plasma cloud eject and close frit. Through detecting in real time part of plasma cloud eject acquires the position with late frit, so that soldering,the information that can reflect workpiece frit to show behaviour of feature of alveolus of condition, token is gotten in the process, undertake frit reachs frit greatly to show control soldering thereby. Make electric current from change between 55~85A, find out respectively next different solder the corresponding relationship with horn of eject of electric current, plasma cloud and close frit. Different solder the welding line incision below electric current will pass processing, can measure a corresponding welding line frit deep. In other solder below the condition with changeless parameter, as solder voltaic accretion, solder frit is deep increase, to find out the frit of different electric current deep concern with the correspondence of horn of plasma cloud eject, the frit that needs to measure a different electric current reachs angle of fire of corresponding plasma cloud gush greatly. Make electric current from change between 55~85A, find out respectively next different solder the corresponding relationship with horn of eject of electric current, plasma cloud and close frit. Different solder the welding line incision below electric current will pass processing, can measure a corresponding welding line frit deep. In other solder below the condition with changeless parameter, as solder voltaic accretion, solder frit is deep increase, to find out the frit of different electric current deep concern with the correspondence of horn of plasma cloud eject, the frit that needs to measure a different electric current reachs angle of fire of corresponding plasma cloud gush greatly. Different solder the scabbard layer voltage that horn of eject of deep, plasma cloud reachs the frit below electric current to detect accordingly, as solder voltaic accretion, frit is deep increase, angle of fire of corresponding plasma cloud gush also increases, should solder electric current is 85A, when alveolus is about to form, perhaps say work be about to when frit is appeared, eject horn is achieved the biggest. The form that uses coordinate is OK more apparent ground shows frit to shoot horny relation greatly with plasma cloud gush, the control that the frit deep frit that this relation curve solders for plasma arc shows laid a foundation. 5 conclusion experiment proves, horn of plasma cloud eject shows the effect with having main in control in alveolus frit, it is the important parameter that token alveolus frit shows diagnostic information, through detecting the size of horn of plasma cloud eject can judge frit deep feeling besides. In alveolus plasma arc solders in, but through detecting the change of horn of plasma cloud eject gets the information with deep frit, repass adjustment solders electric current will realize frit to show control. CNC Milling