CN85100690B - Push-pull short circuit metal transfer welding and its pulsating wire feeder - Google Patents
Push-pull short circuit metal transfer welding and its pulsating wire feeder Download PDFInfo
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- CN85100690B CN85100690B CN85100690A CN85100690A CN85100690B CN 85100690 B CN85100690 B CN 85100690B CN 85100690 A CN85100690 A CN 85100690A CN 85100690 A CN85100690 A CN 85100690A CN 85100690 B CN85100690 B CN 85100690B
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- welding wire
- chuck
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- wire
- short circuit
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Abstract
The present invention relates to a short circuit transfer welding method by pushing and pulling and a pulsation wire feeding machine thereof, which are used for various electric arc welding, particularly for CO2 gas shielded welding. The method is characterized in that a welding wire acts periodic pulsation movements; each period can be divided into an advancing stage, a backing stage and a pause stage, wherein the pause stage is the major stage; a molten drop is conveyed to a molten pool depending on the quick advancing movements of the welding wire to cause short circuit, and then the molten drop is disengaged from the welding wire through the quick backing of the welding wire to accomplish molten drop transfer. The selection of a welding standard gets rid of limitation caused by the molten drop transfer, and possibility is provided for reducing splashes, improving forming processes, and improving welding performance on space positions, so that the pulsation wire feeding machine provided by the present invention can accurately accomplish the back-and-forth pulsation movements of the welding wire.
Description
The present invention is used for CO
2In the gas shielded arc welding.
CO
2Gas shield is welded with many advantages, but also exists than important disadvantages, promptly splash big, moulding is poor.To splash in order reducing, need to adopt lower arc voltage, make molten drop often and molten bath short circuit and transition.Splash for the restriction short circuit, generally need in welding circuit, to add suitable induction reactance L.Improve arc voltage and can improve appearance of weld, but molten drop just is difficult for and the molten bath short circuit like this, forms free transition, making splashes greatly increases.
A large amount of research works show: when short circuiting transfer, the main source that splashes is that the liquid metal foot bridge blast between short circuit later stage bridging molten bath and the welding wire is caused.Also have at molten drop in addition to rigidly connect the initial instantaneous of touching the molten bath, the contact position electric current increases sharply suddenly, produces blast, and whole molten drop is walked from the weld pool surface bullet, flies away from the molten bath and causes.
For effectively being carried out the transition in the molten bath smoothly, goes molten drop, Soviet Union's " weldering automatically " 77 years the 1st people such as phase the east of Sichuan of magazine have proposed a kind of pulsed wire feeding welding method that is superimposed with a set forward on general constant-speed wire-feeding basis again, the pulsating motion of welding wire is realized by two cover " three steel balls " chucks, an interplanting front-rear reciprocation movement wherein, another set of transfixion, the clamping welding wire advanced jointly when last cover advanced, because of welding wire can not be retreated by another set of chuck clamping, can only slide backward when retreating along welding wire.The welding wire of making pulsating motion makes molten drop obtain the kinetic energy of preshoot, molten drop is carried out the transition in the molten bath easily go, but rely on preshoot merely, unless the spot speed of welding wire pulsation is quite high, otherwise is difficult to make molten drop to break away from welding wire.
In welding journal 84 years the 1st people's such as phase Wang Qilong pulsed wire feeding welding method, form a certain size molten drop when wire tip after, welding wire is sent to the molten bath apace, molten drop and molten bath short circuit.Short circuit electric arc is later ignited again, and process repeats.Owing to be necessary for to make and break away from welding wire with the molten drop of molten bath short circuit enough electromagnetic contractile forces are provided, so short circuit current can not descend too much, otherwise short circuit duration can significant prolongation, the process deterioration in this method.
The objective of the invention is to make under any welding condition, molten drop all carries out in a kind of special short circuiting transfer mode.In this short circuiting transfer, molten drop is sent to the molten bath by the unexpected forward travel rapidly of welding wire after the welding wire end grows to certain size, contact with the molten bath, causes short circuit.Then, welding wire retreats again immediately fast.Like this, because the surface tension effects in molten bath, molten drop liquid metal major part is left in the molten bath, and short circuit destroys, electric arc ignites again, in the long afterwards time, and the welding wire transfixion, grow up gradually behind certain size again up to molten drop, welding wire advances suddenly again rapidly, and process repeats.In this welding method, the droplet transfer is that the mechanical movement by welding wire is delivered in the molten bath under compulsion and gone, and breaks away from welding wire then again by retreating fast of welding wire.No matter how are welding conditions such as arc voltage, electric current, polarity, locus, molten drop can both be by the reliably transition regularly of frequency stabilization of defined.Do the selection that makes welding conditions like this and broken away from because of suffered restriction of droplet transfer, allowed band is greatly widened, and splashes thereby can reach to reduce, and improves moulding, room for improvement position welding performance, the purpose of raising deposition efficiency.
Fig. 1 is the fundamental diagram of this method, and the molten drop on the welding wire head is grown up to certain size, when being close with gage of wire 2., welding wire begins to run, and molten drop contacts with the molten bath, and electric arc by short circuit 3., because the surface tension effects in molten bath, the molten drop liquid metal is poured into the molten bath.The quick immediately rollback of welding wire after the short circuit, molten dropping in the welding wire junction broken, and 4. electric arc ignite again.After welding wire falls back on to a certain degree, just 5. slack.Later on welding wire constantly melts, and molten drop is grown up, and 6. electric arc also be elongated, and grows up to again near gage of wire the time when molten drop, 7. reaches 1., and process repeats beginning again.Welding wire advance amount δ
fWith the welding wire amount of retreating δ
bDifference be wire feed step pitch δ actual in each pulsation period, strong rapidly for guaranteeing the droplet transfer, the welding wire run duration should be lacked as much as possible, as accounts for about 1/3rd of the whole cycle.Welding wire ripple frequency per second about 20 times.
The randomness short circuiting transfer that contact with the molten bath because molten drop is grown up in the short circuiting transfer of this mode and the general constant-speed wire-feeding is different, and just advancing to pulsation with general welding wire makes molten drop and molten bath short circuiting transfer is also different forcibly.Here molten drop is shifted onto in the molten bath by welding wire and is gone, and is retreated by welding wire again then and is broken, and therefore this short circuiting transfer is called push-pull short circuit transition.This method is called the push-pull short circuit transition welding.
Push-pull short circuit transition requires special wire-feed motor.Fig. 2 is the structure of this wire-feed motor.
Three groups of " three steel balls " chuck A, B, C being driven by motor (1) and cylindrical cam (2) respectively are made up of oneself tapered sleeve and three steel balls.Two tapered sleeves of B, C are together.The tapered sleeve of A, C chuck keeps together by separately awl lid (3) and spring (4) and separately steel ball respectively, and the steel ball of B but is that the steel ball with A is associated in by coupling sleeve (5) and moves.When chuck A is moved to the left on Fig. 2 along guide rod (6), the pressure to welding wire that tapered sleeve and steel ball produced makes the clamping of A steel ball welding wire (7) also to advance with same speed left.Chuck C is also setting in motion simultaneously at this moment, but its speed is little than A, is to fall back on welding wire with respect to welding wire therefore, and the chuck that falls back does not hinder welding wire by advancing.The A chuck advances through behind the certain distance, moves closer to chuck B, C, and the tapered sleeve of B chuck is contacted with steel ball.The design of collet movement make this in a flash each chuck relative velocity be zero, can avoid like this impacting, reduce wear and noise.After this three chucks and welding wire all advance with same speed, up to the forefront, and the welding wire δ that advanced at this moment
fThe length of-welding wire advance amount.
After chuck had been moved to the forefront, because the opposite direction clamping action of chuck B, welding wire can not continue preshoot, is forced to stop on the spot with chuck, does the constancy that has guaranteed the welding wire advance amount like this.
Then, another retreats three chucks, falls back on certain position, stops again.Welding wire together by chuck B clamping and is retreated, and this segment distance that is moved back is called the welding wire amount of retreating δ
b
When chuck retreats and when stopping, because the opposite direction clamping action of chuck A, C, welding wire can not continue backlash, is forced to stop on the spot with chuck, does the constancy that has guaranteed the welding wire amount of retreating like this.
After waiting each chuck and welding wire all to come to a complete stop, after a period of time, chuck A just continues to retreat, and gets back to original homeposition, for next push-pull pulsed wire feeding is got ready.Because the opposite direction clamping action of chuck C, welding wire is transfixion at this moment, and steel ball B is coupled pipe (5) and extracts from tapered sleeve, follows A to get back to homeposition together.
Then, whole process repeats.
Fig. 3 represents the motion state of chuck.Solid line is that chuck A(comprises tapered sleeve A among the figure, steel ball A, B) curve movement, dotted line is that chuck C(comprises tapered sleeve B, C and steel ball C) curve movement.Steel ball B and tapered sleeve B went up the distance between the corresponding contact point when Oa represented to move beginning.Begin to overlap to a moment two lines through certain hour, expression tapered sleeve B and the steel ball B of oneself close.Later three groups of chuck A, B, C advance together, retreat together, stop together.Up to b constantly, the represented chuck A of solid line begins again to retreat, and gets back to original homeposition, and the represented chuck C of dotted line keeps motionless.
Motor rotates a circle, chuck back and forth once, molten drop of transition.The welding wire δ that at every turn advances
f, retreat δ
b, actual wire feed step pitch δ=δ
f-δ
b, δ has determined the volume and the size of molten drop.
Change the rotating speed of motor, can change the frequency of droplet transfer.Change the shape of cam.Can change δ
f, δ
bAnd δ.
In three general steel ball pulsating solder wire feeders, welding wire directly contacts with steel ball, and rust dirt on the welding wire or plating exfoliation can make chuck work malfunctioning.For avoiding the generation of this situation, can take to drive indirectly the scheme of wire feed, welding wire is not directly contacted with steel ball.Fig. 4 is that welding wire is driven the Push-pull Pulsed Wire Feeder of sending to indirectly.Fig. 5 is the MM sectional view of Fig. 4.
Motor (8) drives disk (12) and (13) that can rotate freely by cylindrical cam (9) connecting rod (10) and makes crankmotion on axle (11).Each disk periphery all has three protrusions.(12) go up inclined-plane A of each protrusion band, (13) be with two inclined-plane B and C on, adorning a roller on A and the C inclined-plane regularly, the roller on B inclined-plane is associated in motion by coupling sleeve (14) with the A roller, when disk (12) and (13) are driven when making crankmotion, overcoat (15) is also made crankmotion by drive, just the anglec of rotation is bigger on direction, the anglec of rotation is less on another direction, it is identical when its principle and front welding wire are directly driven, uniquely different be one and directly drive welding wire that another has driven overcoat (15) indirectly.Wire pushing roller (16) is bound up with overcoat, makes welding wire (17) produce push-pull pulsed motion.For avoiding contingent skidding between welding wire and roller, roller surface should resemble and have indentation to increase frictional force the common wire feed.
Change cam face and wire pushing roller diameter and can change δ
f, δ
bAnd δ.
Claims (3)
1, a kind of CO that is used for
2" pulsed wire feeding " method of gas shielded arc welding.During arc burning, the welding wire transfixion, form a certain size molten drop when wire tip after, welding wire is sent to the molten bath apace, molten drop and molten bath short circuit, short circuit later electric arc are ignited again, process repeats.It is characterized in that welding wire advances fast, after molten drop and the molten bath short circuit, welding wire retreats immediately rapidly.Molten drop and is finished the droplet transfer because the surface tension effects in molten bath is left in the molten bath.
2, for realizing the pulsating solder wire feeder of the described method of claim 1.Welding wire is done forward travel by " three a steel balls " chuck clamping.When this chuck retreated, welding wire firmly can not be retreated by another " three steel balls " chuck system.It is characterized in that having three " three steel balls " chuck A, B, C.Wherein A and C are towards welding wire direction of advance clamping welding wire, and B is towards welding wire direction of retreat clamping welding wire.The tapered sleeve of chuck B and C is associated in together, and the tapered sleeve of chuck A is independent.The tapered sleeve of chuck A and C is associated in separately steel ball respectively, and the steel ball of chuck B is associated in by the steel ball of coupling sleeve with chuck A.Chuck drives motion by cam separately by lever.Drive welding wire by chuck A when chuck advances jointly and advance, when chuck retreats jointly, drive welding wire by chuck B and retreat.After falling back on certain distance, chuck C is slack, makes welding wire can not follow chuck A to continue to retreat.
3,, it is characterized in that welding wire is by being contained in wire pushing roller (16) drive on the axle (11) and advancing, retreat and stop for realizing the another kind of pulsating solder wire feeder of the described method of claim 1.Back and forth rotation is gone up at axle (11) in disk (12) and (13).Several groups " inclined-plane-rollers " are arranged on the disk.Every group has chuck A, B, C.Disk has inclined-plane A on (12), and disk has inclined-plane B and C on (13).The inclined-plane of A and C is associated in separately roller respectively, and the roller of inclined-plane B is associated in the A roller by coupling sleeve.Disk is driven by lever by cam separately.When changeing before disk is common, chuck A drives axle (11) advances welding wire, and when changeed the common back of disk, chuck B drives axle (11) retreated welding wire.After falling back on certain distance, chuck C is slack, makes axle (11) and welding wire can not continue to retreat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100690A CN85100690B (en) | 1985-04-01 | 1985-04-01 | Push-pull short circuit metal transfer welding and its pulsating wire feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100690A CN85100690B (en) | 1985-04-01 | 1985-04-01 | Push-pull short circuit metal transfer welding and its pulsating wire feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100690A CN85100690A (en) | 1985-12-20 |
| CN85100690B true CN85100690B (en) | 1987-03-11 |
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ID=4791363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100690A Expired CN85100690B (en) | 1985-04-01 | 1985-04-01 | Push-pull short circuit metal transfer welding and its pulsating wire feeder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100690B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2292364B1 (en) | 2009-06-19 | 2016-01-06 | Panasonic Intellectual Property Management Co., Ltd. | Consumable electrode arc welding method and consumable electrode arc welding device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158777A (en) * | 1996-03-05 | 1997-09-10 | 郑宝英 | Splash-reducing carbon dioxide arc welder |
| CN102441722B (en) * | 2010-09-30 | 2015-05-27 | 株式会社大亨 | Arc welding method |
| CN110802303A (en) * | 2019-10-30 | 2020-02-18 | 深圳市佳士科技股份有限公司 | CO2Welding control method and device, terminal equipment and computer readable storage medium |
| CN114535755B (en) * | 2022-03-31 | 2024-01-19 | 北京工业大学 | High-dynamic wire feeding control method for fusion welding process based on piezoelectric actuator |
-
1985
- 1985-04-01 CN CN85100690A patent/CN85100690B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2292364B1 (en) | 2009-06-19 | 2016-01-06 | Panasonic Intellectual Property Management Co., Ltd. | Consumable electrode arc welding method and consumable electrode arc welding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100690A (en) | 1985-12-20 |
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