CN108067720A - A kind of energy storage welding procedure for muffler - Google Patents

Abstract

The invention belongs to welding procedure fields, disclose a kind of energy storage welding procedure for muffler, include the following steps：First, metal pipe cap and tube socket are respectively placed in the upper weld mold and lower weld mold of dimension；Secondth, using the electric energy stored up in energy-storage capacitor, apply certain welding pressure, great welding current is obtained using the characteristics of energy abrupt release；3rd, contact resistance converts electric energy to welding process of the thermal energy so as to fulfill metal pipe cap and tube socket.Quality of weld joint is high：Since welding process that is, discharge process only have some thousandths of second, welding when produced heat workpiece is caused to cross thermal oxide and mechanically deform situations such as minimize.There is suitable material scope wide, economize on electricity and small to electric network influencing.

Description

A kind of energy storage welding procedure for muffler

Technical field

The invention belongs to welding technique fields, and in particular to a kind of energy storage welding procedure for muffler.

Background technology

Stored energy welding of the prior art is used further to weld as the term suggests electric energy is referred to store, and electric energy is exactly to store up There are inside capacitor, it is seen that the importance of capacitor.At present, capacitor damage problem comes one after another over time, High failure rate is filled not into electricity, and the electricity being charged into cannot release completely, causes power that cannot export completely, is made originally The weldering that can be welded is bad or even does not weld, and also oil leak, service life are extremely limited even in the worst case.

At present, using conventional, electric-resistance welding procedure, although equipment price is cheap, shortcoming it is clear that welding quality not It is unreliable to stablize, and power consumption is high, it is larger that network voltage is impacted, and influences the automatic control program of the entire production line and control essence Degree；Therefore, if carrying out automation Promotion Transformation, it is necessary to abandon conventional, electric-resistance Welding, use a kind of new welding procedure.

The content of the invention

Present invention aim to address the problem of conventional bonding technique stability difference and high equipment failure rate, one kind is provided For the energy storage welding procedure of muffler, to solve the problems, such as that existing product exists in production.

The present invention is achieved by the following technical solution：

A kind of energy storage welding procedure for muffler includes the following steps：

First, metal pipe cap and tube socket are respectively placed in the upper weld mold and lower weld mold of dimension；

Secondth, using the electric energy stored up in energy-storage capacitor, apply certain welding pressure, utilize energy abrupt release Feature obtains great welding current；

3rd, contact resistance converts electric energy to welding process of the thermal energy so as to fulfill metal pipe cap and tube socket.

Beneficial effects of the present invention mainly include but is not limited to the following aspects：

First, quality of weld joint is high：Since welding process that is, discharge process only have some thousandths of second, in welding Situations such as produced heat causes workpiece to cross thermal oxide and mechanically deform minimizes.Just because of this feature, using energy storage The connector of Welding welding, solder joint is secured, has higher tension and shearing strength, and solder joint and its heat affected area neither black, Also without apparent weld mark.The connector welded with other welding resistance methods has apparent blue oxide skin trace.

2nd, suitable material scope is wide：Since welding process is the process that sparks and to form high current, to workpiece base material The contact resistance of resistance and faying face requirement it is relatively low, so use the technique not only can with welding low-carbon steel, galvanized steel, aluminize The non-ferrous metals such as the ferrous metal such as steel, stainless steel, the also preferable copper of solderable electric conductivity, aluminium, titanium, silver.This is other common electricity Welding resistance technique is not accomplished.Even if the relatively advanced medium frequency inverter resistance-welding process of present technology, it is also difficult to substitute.

3rd, economize on electricity：Power is low, power factor is higher due to being taken from power grid, meanwhile, the high current collection for the generation that sparks In on solder joints face, loss it is less, so as to achieve the purpose that economize on electricity.Empirical data suggests that：With reaching equal Weldability Power frequency welding machine, intermediate-frequency welding machine, three-phase rectifier welder compare, electricity consumption only has their 1/10,1/6,1/5 respectively.

4th, it is small to electric network influencing：Stored energy welding is to first pass through charging transformer to be stored in capacitance electric energy, then by putting Piezoelectric transformer releases the electric energy for being stored in capacitance, charge power very little, and discharge time is extremely short, so to network electricity Pressure influences very little, that is to say, that using the welding machine, other any electrical equipments in workshop is not had an impact.Also it is exactly this Feature, some clients can not use energy storage to weld in transformer in the case of increase-volume, so as to avoid generating more machines work simultaneously It causes power grid deficiency and triggers welding quality unstable.By taking certain workpiece as an example, if using percussion welder, tens KVA are only needed Transformer, if using conventional, electric-resistance Welding, need the transformer of about 250KVA.

Specific embodiment

In order to make those skilled in the art better understand the technical solutions in the application, have below in conjunction with the application Body embodiment more clearly and completely describes the present invention, it is clear that described embodiment is only the application one Divide embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making All other embodiments obtained under the premise of creative work should all belong to the scope of protection of the invention.

A kind of energy storage welding procedure for muffler includes the following steps：

First, metal pipe cap and tube socket are respectively placed in the upper weld mold and lower weld mold of dimension；

Secondth, using the electric energy stored up in energy-storage capacitor, apply certain welding pressure, utilize energy abrupt release Feature obtains great welding current；

3rd, contact resistance converts electric energy to welding process of the thermal energy so as to fulfill metal pipe cap and tube socket.

Percussion welder in the present invention carries out programme-control using transistor unit.Charge and discharge switch is with silicon-controlled replacement Bulky A.C. contactor and ignitron.Silicon-controlled as contactless high-current switch has small, noiseless, user Just the features such as.Particularly its pressure drop only has the 1/10 of ignitron, is effectively utilized electric power.As energy storage is electrolysed The development of capacitor, the energy storage capacity of stored energy welding machine can reach very big, and but very little, charging voltage are accurate by electronic switch for volume It controls and continuously adjustable, and is monitored by voltmeter.Circuit has over-pressure safety device, prevents breakdown energy storage electric container.

Since the charging current of capacitor percussion welder is much smaller than discharge current, its impact very little to power grid is right The requirement of power is not also high.Further, since its discharge time is extremely short, also can guarantee in the case of mains fluctuations The stabilization of welder performance.The cooling interval occurred when electric current is reversed in alternating current circuit is not present in its discharge range, therefore, relatively suitable Together in the welding electric conductivity and good light metal of thermal conductivity, as mild steel, kovar alloy, stainless steel, nickel filament and other are conductive, The good metal of thermal conductivity.Capacitor C_pIt charges, C_pAfter voltage needed for reaching, S again with S2 point contacts, capacitor C_pBecome by welding The first winding electric discharge of depressor T2.Resistor R₁It is control charging current and charging time.Due to welding circuit resistance very Small, therefore, electric current is very big, and the instantaneous heat quantity of generation is more, convenient for welding.

The energy of capacitor is filled with DC power supply in the present invention, if the energy E of capacitor storage_KIt represents, Capacitance C_pIt represents, then E_KBy size and C that capacitor storage energy is calculated_pIt is directly proportional, with charging voltage U_c's Square directly proportional, E to be changed_K, C can be adjusted_pOr U_c.In order to increase capacitor storage energy, improve charging voltage and hold than improving Amount is more effective.

According to the discharge type of secondary circuit, capacitor percussion welder can be divided into two kinds：One kind is directly to discharge, i.e. solderless Connect transformer capacitor device percussion welder；Another kind is indirect discharge, that is, has welding transformer capacitor percussion welder.Welding becomes The capacitor percussion welder of depressor has the advantages that equipment is simple and capacity usage ratio is high.Shortcoming is that operating voltage is too high, uneasy Entirely, and there is loud noise, there is splashing metal, influence its promoting the use of in production.There is welding transformer capacitor percussion welder Capacitor discharge, be to be carried out in the primary winding of welding transformer, weldment is heated by secondary side current.Its feature It is that small low-voltage, high current, noise, safe operation, welding quality stable be reliable, purposes is than wide.It has focused below The capacitor stored energy welding of welding transformer.During charging, as time t=0, the charging voltage U of capacitor_C=0, at this point, electric current i₀ Depend entirely on voltage U₀With the resistance R in charge circuit₁。

The charging voltage of capacitor is generally controlled by voltage relay, and in order to accelerate charging process, rectified voltage generally will More than charging ceiling voltage 30%~50%, in fact, the charging voltage of capacitor can reach the amplitude of rectified voltage.

From the above analysis, when welding machine is selected, L, C are constant, and increase R values can make electric discharge by being periodically changed into non-week Phase property.But either periodic discharge or aperiodicity discharge type, for weld heating electric current only there are one half-wave It is effective.When oscillating discharge, amplitude is decayed terribly, and second half wave-amplitude only has first half wave-amplitude 3.5% or so.At this point, welding has been completed, the resistance of weldment very little, so, the later pulsing effect of first half-wave is very It is small.Vibration is general to continue 3~5 half-waves i.e. disappearance.

The welding of cycle of oscillation property electric discharge has the following advantages：It reduces when welding ends and showing for cremate is generated between electrode As；Beneficial to the demagnetization of transformer；Portion of energy can be stored in capacitor again, used in next cycling.

Thermal process mainly includes two stages, i.e. heating period and cooling stage, the former should ensure that weldment is contacted with weldment The metal at place is heated to molten state to form fusing core；The latter should ensure that molten metal solidifies and promotes welding section temperature Degree reduces rapidly.

In conclusion just because of percussion welder have energy is big, small, small to the impact of power grid, welding efficiency is high, The features such as reliable in quality, makes its extensive use in hydrid integrated circuit production.

High yield quality：Control accuracy is 20 times or more of traditional SCR types resistance welder, and secondary current fan-out capability is strong, Waveform is straight, and when welding is nearly free from splashing, and pad surface quality is good.

Low production cost：Three-phase load is balanced, reduces power grid impact, meets preferential ower rate requirement；Power is because being up to More than 0.9, and weld interval is short, obvious energy conservation.

Save infrastructure investment：It is low to the power demand in workshop, be only tradition SCR secondary commutation resistance welders three/ One.Due to increasing considerably the virtual value of welding current, the actual welding time is made to reduce more than 20%, while greatly reduces welding The demand of pressure.

Extensive adaptability：The welding of multiple material is applicable in, such as the material that aluminum metal heat conduction is fast, weldability is poor can also obtain To good welding.In addition, the welding for galvanized sheet and common multilayer steel plates, welding quality is also far above common industry frequency welding Machine.The specific implementation of the invention is not to be limited to these illustrations for more than content, for the technical field of the invention For those of ordinary skill, without departing from the inventive concept of the premise, several simple deduction or replace can also be made, all should When being considered as belonging to present invention scope of patent protection determined by the appended claims.

Claims (1)

1. a kind of energy storage welding procedure for muffler includes the following steps：

First, metal pipe cap and tube socket are respectively placed in the upper weld mold and lower weld mold of dimension；

Secondth, using the electric energy stored up in energy-storage capacitor, certain welding pressure is applied, the characteristics of using energy abrupt release Obtain great welding current；

3rd, contact resistance converts electric energy to welding process of the thermal energy so as to fulfill metal pipe cap and tube socket.