CN103567652B - Aluminum alloy direct current plasma-tungsten electrode argon arc hybrid welding method based on pulse coordination control - Google Patents
Aluminum alloy direct current plasma-tungsten electrode argon arc hybrid welding method based on pulse coordination control Download PDFInfo
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- CN103567652B CN103567652B CN201310563610.8A CN201310563610A CN103567652B CN 103567652 B CN103567652 B CN 103567652B CN 201310563610 A CN201310563610 A CN 201310563610A CN 103567652 B CN103567652 B CN 103567652B
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- 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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Abstract
The invention aims to provide an aluminum alloy direct current plasma-tungsten electrode argon arc hybrid welding method based on pulse coordination control. A tungsten electrode argon arc welding gun is exerted on one side of a plasma arc welding gun, in the welding process, the tungsten electrode argon arc welding gun is utilized to remove oxidation films on the surface of aluminum alloy in front of the direct current plasma welding gun, and the direct current plasma welding gun is utilized to conduct welding behind the tungsten electrode argon arc welding gun. In order to avoid electromagnetic interference between plasma arcs and tungsten electrode argon arcs in the welding process, when a plasma arc current is in a pulse basic value pilot arc stage, a pulse signal controller is triggered, and a tungsten electrode argon arc current is adjusted to be in a negative half wave crest value for removing the oxidation films on the surface of the aluminum alloy; when the plasma arc current is in a pulse crest value welding stage, the pulse signal controller is utilized to adjust the tungsten electrode argon arc current to be in pulse basic value output, and the steps are repeatedly executed in this way. According to the method, the current pulse wave form of the tungsten electrode argon arcs and the current pulse wave form of a plasma arc power supply are reasonably adjusted, the effect of cleaning the oxidation films on the surface of the aluminum alloy and weld penetration are controlled, and therefore weld formation is guaranteed, tungsten electrode burning losses are reduced, and welding efficiency is improved.
Description
Technical field
What the present invention relates to is a kind of welding method, specifically Welded method.
Background technology
Aluminium alloy has lightweight, high-strength, excellent decay resistance, and good economic benefit, therefore, receives pay close attention to widely at engineering fields such as automobile, boats and ships, Aero-Space.Along with industrial requirement development, Aluminum-aluminum alloy material has become the first-selection of industrial production application.In industrial production manufactures, its welding manner is mainly the welding that argon tungsten-arc welding (TIG) and metal argon arc welding (MIG) carry out Aluminum-aluminum alloy.Compared with traditional electrical arc-welding, plasma arc welding (PAW) (PAW) has that joint penetration is large, heat affected area is narrow, residual stress and be out of shape the advantages such as little after welding, in the connection of aluminium alloy, show good application prospect.For one deck dense oxidation film that cleaning aluminum alloy surface exists, the normal welding adopting Variable Polarity AC plasma arc to carry out aluminium alloy both at home and abroad.And Variable Polarity ac plasma arc welding aluminium alloy requires source of welding current dependable performance, the positive and negative half band-width in a-c cycle territory is also adjustable, the appearance of weld gone for, and must spend and go for a long time to adjust parameters, and equipment price is expensive, be difficult to apply on a large scale.In addition, Variable Polarity AC power can not be used for supporting welding at the heat that its negative half-wave target produces, and cause workpiece heat affected area to increase on the contrary, electrode life shortens.Research shows, when utilizing ac plasma arc welding aluminium alloy, because tungsten electrode scaling loss can cause its neck-in to change, cause the current density of plasma arc to change, cause welding process bad stability, the uniformity of appearance of weld be difficult to ensure.The patent of invention of application number 200720039986.9 a kind of plasma arc welding (PAW) and argon tungsten-arc welding combined welding device, its plasma gun is positioned at tungsten argon arc welding gun rear, the feature strong by plasma weldering penetration capacity and the free electric arc of argon tungsten-arc welding have good shoe lid ability, thus reach front and back and to be shaped effect attractive in appearance, and plasma gun and tungsten argon arc welding gun weld simultaneously, the welding waste heat of plasma postwelding can for reducing energy immediately following TIG welding cap face thereafter.Due to the combination that it is simple mechanism, have certain effect when weldable steel iron material, during welding aluminum alloy, many problems (as tungsten electrode scaling loss, appearance of weld stability etc.) are still unresolved.Show according to correlative study, the plasma arc of direct current reversed polarity also can be adopted to carry out the welding of aluminium alloy, but its electrode erosion is too fast, in welding process, available thermal power is low also affects welding quality and efficiency.
Based on the consideration overcoming the problems referred to above, the present invention proposes a kind of aluminium alloy direct current plasma-tungsten argon arc composite welding new technology controlled based on pulse matching, namely tungsten argon arc welding gun is applied in the side of plasma (welding) torch, utilize (exchange or reversed polarity) tungsten argon arc welding gun to clear up aluminum alloy surface oxide-film above during welding, utilize direct current plasma welding gun after weld.By the current pulse shape of reasonable adjusting tungsten argon arc and plasma arc power supply, control cleaning effect and the weld penetration of aluminum alloy surface oxide-film, thus ensure appearance of weld, reduce tungsten electrode scaling loss, improve welding efficiency.Electromagnetic interference during for preventing from welding between plasma arc and tungsten argon arc, adopt the method that pulse matching controls, namely, when arc-plasma current is in pulse base value arc maintenance, start pulse signal controller, regulates tungsten argon arc electric current to be the cleaning that negative half crest value carries out aluminum alloy surface oxide-film; When arc-plasma current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller and export, so repeatedly.
Summary of the invention
The object of the present invention is to provide the current pulse shape by reasonable adjusting tungsten argon arc and plasma arc power supply, control cleaning effect and the weld penetration of aluminum alloy surface oxide-film, thus the aluminium alloy direct current plasma-tungsten argon arc complex welding method controlled based on pulse matching ensureing appearance of weld, reduce tungsten electrode scaling loss, improve welding efficiency.
The object of the present invention is achieved like this:
The present invention is based on aluminium alloy direct current plasma-tungsten argon arc complex welding method that pulse matching controls, it is characterized in that:
(1) I shape, Y shape or V-butt are processed in the position to be welded of workpiece to be welded, joint form is docking or overlap joint, and polishes to the groove made and both side surface thereof and clean, arrange welding equipment: described welding equipment comprises: plasma arc welding (PAW) power supply, plasma gun, tungsten argon arc power supply, tungsten argon arc welding gun, signal processing unit, signal processing unit is by current signal detector, signal processor, signal controller connects to form successively, plasma arc welding (PAW) power cathode connects current signal detector and plasma gun respectively, first hf arc starter is set between plasma arc welding (PAW) power cathode and plasma gun, plasma arc welding (PAW) positive source connects workpiece to be welded, pole connection signal controller and the tungsten argon arc welding gun respectively of tungsten argon arc power supply, second hf arc starter is set between tungsten argon arc power supply and tungsten argon arc welding gun, another pole of tungsten argon arc power supply connects workpiece to be welded, plasma gun is towards position to be welded, the angle of tungsten argon arc welding gun in the side of plasma gun and between tungsten argon arc welding gun and plasma arc axis is 25 °-75 °,
(2) plasma arc welding (PAW) power supply and tungsten argon arc power supply is opened: start the first hf arc starter 2, ignite plasma arc welding (PAW) power supply, then starts the second hf arc starter, and ignite tungsten argon arc power supply;
(3) weld: utilize tungsten argon arc welding gun at front cleaning surface of the work oxide-film to be welded, utilize plasma gun after carry out welding thus making appearance of weld; In welding process, detect when direct current plasma arc current is in pulse base value arc maintenance through current signal detector, through signal processor start pulse signal controller, regulate tungsten argon arc electric current to be the cleaning that peak value carries out surface of the work oxide-film to be welded; When direct current plasma arc current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller and export, so repeatedly.
The present invention can also comprise:
1, when tungsten argon arc power supply is dc source, the positive pole connection signal controller of tungsten argon arc power supply and tungsten argon arc welding gun; When tungsten argon arc power supply is AC power, the negative pole connection signal controller of tungsten argon arc power supply and tungsten argon arc welding gun, be in series with electric capacity between the positive pole of tungsten argon arc power supply and workpiece to be welded, be in series with inductance between the positive pole of plasma arc welding (PAW) power supply and workpiece to be welded.
2, welding equipment also comprises filler wire, and tungsten argon arc welding gun and filler wire are positioned over the both sides, front and back of plasma gun or are positioned over the left and right sides of plasma gun, and argon-arc welding gun and the angle between filler wire and plasma arc axis are 25 °-75 °.
3, plasma arc welding (PAW) power supply background current is 10-100A, and peak point current is 50-500A, and pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; Tungsten argon arc power supply background current is 5-50A, and peak point current is 20-200A, and pulse frequency is consistent with plasma arc welding (PAW) supply frequency, shielding gas flow amount 1.0-15L/min; The tungsten electrode diameter of tungsten argon arc welding gun is 0.8-6.0mm, and speed of welding is 10-150cm/min; Plasma arc welding (PAW) power supply tungsten electrode neck-in is 0.5-3.0mm, the tungsten electrode of tungsten argon arc welding gun is 2.0-7.0mm apart from workpiece to be welded, plasma arc welding (PAW) power supply nozzle is apart from workpiece to be welded from being 1.0-8.0mm, and tungsten electrode and the plasma arc welding (PAW) power supply injector spacing of tungsten argon arc welding gun are 2-10mm.
4, plasma arc welding (PAW) power supply background current is 10-100A, and peak point current is 50-500A, and pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; Tungsten argon arc power supply background current is 5-50A, and peak point current is 20-200A, and pulse frequency is consistent with plasma arc welding (PAW) supply frequency, shielding gas flow amount 1.0-15L/min; The tungsten electrode diameter of tungsten argon arc welding gun is 0.8-6.0mm, and speed of welding is 10-150cm/min; Plasma arc welding (PAW) power supply tungsten electrode neck-in is 0.5-3.0mm, the tungsten electrode of tungsten argon arc welding gun is 2.0-7.0mm apart from workpiece to be welded, plasma arc welding (PAW) power supply nozzle is apart from workpiece to be welded from being 1.0-8.0mm, and tungsten electrode and the plasma arc welding (PAW) power supply injector spacing of tungsten argon arc welding gun are 2-10mm; Filler wire diameter is 0.8-2.0mm, and wire feed rate is 1.0-10m/min.
Advantage of the present invention is:
1, the method adopting pulse matching to control, can avoid the mutual interference between two electric arcs, both achieve the cleaning of aluminium alloy plate surface film oxide, achieve again the direct current plasma arc welding of aluminium alloy plate.By regulating the current pulse shape of plasma arc and tungsten argon arc, aluminum alloy welding termination process can be made to be in perfect condition, is a kind of efficient, controlled welding method.
2, in welding process, plasma power supply is dc source, avoids to the infringement brought electrode life during electric current bears half-wave, and the tungsten electrode scaling loss of article on plasma welding gun, and make that plasma arc outspoken nature is good, weld penetration is large, heat affected area is narrow, ensure quality of weld seam molding.The arc stability of alternating current-direct current argon tungsten-arc welding power supply is good, and aluminium material surface oxide-film cleaning effect is remarkable.
3, adopt direct current plasma arc welding, in, thick aluminum alloy plate (≤12mm) welding without the need to multi-pass welding, the operation such as retaining wall on slope and cleaning before weldering can be reduced.Because arc energy is more concentrated, electric arc penetration ability strengthens, and postwelding workpiece deformation is little, and weldquality is excellent.Be applied in welding production, will greatly enhance productivity, reduce welding cost, improve welding quality, there is very large engineering practical value.
4, owing to adopting direct current plasma power supply, so equipment cost is low, technology stability is good, and owing to adopting signal to control, Automation of Welding degree is high.
5, this system welding procedure is stablized and is had very strong welding adaptability, in welding process, welding position can be downhand welding, also (as vertical position welding or horizontal position welding etc.) can be welded for other position, according to actual welding demand, also can be widely used in the welding of other nonferrous materials (as magnesium alloy etc.).
Accompanying drawing explanation
Fig. 1 is aluminium alloy of the present invention direct current plasma-reversal connection tungsten argon arc composite welding apparatus schematic diagram;
Fig. 2 is aluminium alloy of the present invention direct current plasma-interchange tungsten argon arc composite welding apparatus schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
The present invention is made up of plasma arc welding (PAW) power supply, plasma gun, tungsten argon arc power supply and welding gun, hf arc starter, current signal detector, signal processor and controller etc.Apply tungsten argon arc welding gun in plasma gun front, be connected with two sources of welding current respectively by signal detection and control system.In welding process, adopt the method that pulse matching controls, namely when arc-plasma current is in pulse base value arc maintenance, start pulse signal controller, regulates tungsten argon arc electric current to be the cleaning that negative half crest value carries out aluminum alloy surface oxide-film; When arc-plasma current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller and export, so repeatedly.The mutual interference between two electric arcs can be avoided like this, both achieved the cleaning of aluminium alloy plate surface film oxide, achieve again the direct current plasma arc welding of aluminium alloy plate.Owing to adopting direct current plasma arc welding, the scaling loss of plasma tungsten electrode can be reduced to a great extent, improve stability and the welding quality of plasma-arc, avoid the generation of appearance of weld defect.And direct current plasma arc welding aluminium alloy can simplify welding equipment greatly, reduces welding cost, improves welding efficiency, it is a kind of efficient, controlled welding method.
The step of the welding method implemented with said apparatus is as follows:
Step 1: the position to be welded of workpiece is processed into I shape, Y shape or V-butt as required, joint form can be the various ways such as docking or overlap joint, and polishes to the bevel for welding made and both side surface thereof and clean.
Step 2: during welding, can adopt filler wire as required, also can not adopt filler wire.As adopted filler wire, tungsten argon arc welding gun and filler wire both can be positioned over the both sides, front and back of plasma gun, also the left and right sides of plasma gun can be positioned over, common composition plasma-tungsten argon arc composite welding head, argon-arc welding gun and the angle between filler wire and plasma arc axis are 25 °-75 °, perpendicular to workpiece to be welded, also can there is certain angle between workpiece to be welded in plasma gun.
Step 3: setting welding condition; DC pulse plasma arc background current is 10-100A; peak point current is 50-500A, and pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; pulsed argon arc welding background current is 5-50A; peak point current is 20-200A, and pulse frequency is consistent with plasma arc frequency, shielding gas flow amount 1.0-15L/min; tungsten electrode diameter is 0.8-6.0mm, and speed of welding is 10-150cm/min.Plasma tungsten electrode neck-in is 0.5-3.0mm, and argon arc welding tungsten electrode is 2.0-7.0mm apart from workpiece, and plasma nozzle is apart from workpiece from being 1.0-8.0mm, and argon arc welding tungsten electrode and plasma nozzle spacing are 2-10mm; Filler wire diameter is 0.8-2.0mm, and wire feed rate is 1.0-10m/min.
Step 4: current signal detector 3, signal processor 4, signal controller 6 connect to form signal processing unit 5 successively, in welding process, adopt the method that pulse matching controls, namely when direct current plasma arc current is in pulse base value arc maintenance, start pulse signal controller, regulates tungsten argon arc electric current to be the cleaning that negative half crest value carries out aluminum alloy surface oxide-film; When arc-plasma current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller and export, so repeatedly.By regulating tungsten argon arc peak pulse current time and amplitude, control aluminum alloy surface oxide-film cleaning degree, appearance of weld is controlled by change plasma arc peak pulse time and amplitude, while the cleaning ensureing aluminium alloy plate surface film oxide, the direct current plasma arc welding of aluminium alloy plate can be realized again.
Detailed description of the invention one:
Composition graphs 1, it is based on pulse matching aluminium alloy direct current plasma-reversal connection tungsten argon arc composite welding apparatus embodiment, and present embodiment is made up of plasma arc welding (PAW) power supply 1, plasma gun 12, tungsten argon arc power supply 8, tungsten argon arc welding gun 9, wire-feed motor 14, hf arc starter 2 and 7, current signal detector 3, signal processor (PLC or single-chip microcomputer) 4, signal controller 6 etc.During welding, tungsten argon arc welding gun 9 and filler wire 15 both can be positioned over the both sides, front and back of plasma gun 12, also can be positioned over the left and right sides of plasma gun 12, jointly formed plasma-tungsten argon arc composite welding head.In welding process, the current impulse flowing through plasma arc is detected by current signal detector 3, through signal processor 4 and controller 6, regulate the current impulse of DC reverse connection argon tungsten-arc welding, and then regulate the cleaning degree of aluminum alloy surface oxide-film, control appearance of weld by change plasma arc peak pulse time and amplitude, while the cleaning ensureing aluminum alloy surface oxide-film, the direct current plasma arc welding of aluminium alloy can be realized again.
Welding method step based on the plasma arc-tungsten argon arc set composite of present embodiment is as follows:
Step 1: the position to be welded of workpiece 13 is processed into I shape, Y shape or V-butt as required, joint form can be the various ways such as docking or overlap joint, and polishes to the bevel for welding made and both side surface thereof and clean.
Step 2: during welding, can adopt filler wire as required, also can not adopt filler wire.As adopted filler wire 15, tungsten argon arc welding gun 9 and filler wire 15 both can be positioned over the both sides, front and back of plasma gun, also the left and right sides of plasma gun 12 can be positioned over, common composition plasma-tungsten argon arc composite welding head, tungsten argon arc welding gun 9 and the angle between filler wire and plasma arc axis are 25 °-75 °, perpendicular to workpiece to be welded, also can there is certain angle between workpiece to be welded in plasma gun.
Step 3: setting welding condition; DC pulse plasma arc background current is 10-100A; peak point current is 50-500A, and pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; pulsed argon arc welding background current is 5-50A; peak point current is 20-200A, and pulse frequency is consistent with plasma arc frequency, shielding gas flow amount 1.0-15L/min; tungsten electrode diameter is 0.8-6.0mm, and speed of welding is 10-150cm/min.Plasma tungsten electrode neck-in is 0.5-3.0mm, and argon arc welding tungsten electrode 10 is 2.0-7.0mm apart from workpiece 13, and plasma nozzle 11 is 1.0-8.0mm apart from workpiece 13 spacing, and argon arc welding tungsten electrode and plasma nozzle spacing are 2-10mm; Filler wire diameter is 0.8-2.0mm, and wire feed rate is 1.0-10m/min.
Step 4: open two sources of welding current 1,8, start hf arc starter 2, ignite plasma arc, restarts hf arc starter 7 and to ignite tungsten argon arc.
Step 5: in welding process, adopt the method that pulse matching controls, namely detect when direct current plasma arc current is in pulse base value arc maintenance through current signal detector 3, through signal processor 4 start pulse signal controller 6, tungsten argon arc electric current is regulated to be the cleaning that peak value carries out aluminium alloy 13 surface film oxide; When arc-plasma current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller 6 and export, so repeatedly.By regulating tungsten argon arc peak pulse current time and amplitude, control aluminium alloy 13 surface film oxide cleaning degree, appearance of weld is controlled by change plasma arc peak pulse time and amplitude, while the cleaning ensureing aluminium alloy plate 13 surface film oxide, the direct current plasma arc welding of aluminium alloy plate 13 can be realized again.
Detailed description of the invention two:
Composition graphs 2, it is based on pulse matching aluminium alloy direct current plasma-interchange tungsten argon arc composite welding apparatus embodiment, present embodiment by plasma arc welding (PAW) power supply 1, plasma gun 12, tungsten argon arc power supply 8, tungsten argon arc welding gun 9, hf arc starter 2 and 7, current signal detector 3, signal processor 4 (PLC or single-chip microcomputer), signal controller 6, the compositions such as control system 5, electric capacity 16, inductance 17, wire-feed motor 14.During welding, tungsten argon arc welding gun 9 and filler wire 15 both can be positioned over the both sides, front and back of plasma gun 12, also can be positioned over the left and right sides of plasma gun 12, jointly formed plasma-tungsten argon arc composite welding head.In welding process, the current impulse flowing through plasma arc is detected by current signal detector 3, through signal processor 4 and controller 6, regulate the current impulse of tungsten argon arc, and then regulate the oxide-film cleaning degree of tungsten argon arc, control appearance of weld by change plasma arc peak pulse time and amplitude, while the cleaning ensureing aluminum alloy surface oxide-film, the direct current plasma arc welding of aluminium alloy can be realized again.In argon tungsten-arc welding branch road, the effect of series capacitance 16 prevents the direct current in plasma arc branch road from entering into argon tungsten-arc welding branch road, and in plasma arc branch road, the object of series inductance 17 prevents the interchange in ac tungsten inert gases welding branch road from entering into plasma arc branch road.
Welding method step based on the plasma arc-tungsten argon arc set composite of present embodiment is as follows:
Step 1: the position to be welded of workpiece 13 is processed into I shape, Y shape or V-butt as required, joint form can be the various ways such as docking or overlap joint, and polishes to the bevel for welding made and both side surface thereof and clean.
Step 2: during welding, can adopt filler wire as required, also can not adopt filler wire.As adopted filler wire 15, tungsten argon arc welding gun 9 and filler wire 15 both can be positioned over the both sides, front and back of plasma gun, also the left and right sides of plasma gun 12 can be positioned over, common composition plasma-tungsten argon arc composite welding head, tungsten argon arc welding gun 9 and the angle between filler wire 15 and plasma arc axis are 25 °-75 °, perpendicular to workpiece 13 to be welded, also can there is certain angle between workpiece 13 to be welded in plasma gun 12.
Step 3: setting welding condition; DC pulse plasma arc background current is 10-100A; peak point current is 50-500A, and pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; pulsed argon arc welding background current is 5-50A; peak point current is 20-200A, and pulse frequency is consistent with plasma arc frequency, shielding gas flow amount 1.0-15L/min; tungsten electrode diameter is 0.8-6.0mm, and speed of welding is 10-150cm/min.Plasma tungsten electrode neck-in is 0.5-3.0mm, and argon arc welding tungsten electrode 10 is 2.0-7.0mm apart from workpiece 13, and plasma nozzle 11 is 1.0-8.0mm apart from workpiece 13 spacing, and argon arc welding tungsten electrode and plasma nozzle spacing are 2-10mm; Filler wire diameter is 0.8-2.0mm, and wire feed rate is 1.0-10m/min.
Step 4: open two sources of welding current 1,8, start hf arc starter 2, ignite plasma arc, restarts hf arc starter 7 and to ignite tungsten argon arc.
Step 5: in welding process, adopt the method that pulse matching controls, namely detect when direct current plasma arc current is in pulse base value arc maintenance through current signal detector 3, through signal processor start pulse signal controller 6, tungsten argon arc electric current is regulated to be the cleaning that negative half crest value carries out aluminium alloy 13 surface film oxide; When arc-plasma current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller 6 and export, so repeatedly.By regulating tungsten argon arc peak pulse current time and amplitude, control aluminium alloy 13 surface film oxide cleaning degree, appearance of weld is controlled by change plasma arc peak pulse time and amplitude, while the cleaning ensureing aluminium alloy 13 surface film oxide, the direct current plasma arc welding of aluminium alloy 13 can be realized again.
Claims (5)
1., based on aluminium alloy direct current plasma-tungsten argon arc complex welding method that pulse matching controls, it is characterized in that:
(1) I shape, Y shape or V-butt are processed in the position to be welded of workpiece to be welded, joint form is docking or overlap joint, and polishes to the groove made and both side surface thereof and clean, arrange welding equipment: described welding equipment comprises: plasma arc welding (PAW) power supply, plasma gun, tungsten argon arc power supply, tungsten argon arc welding gun, signal processing unit, signal processing unit is by current signal detector, signal processor, signal controller connects to form successively, plasma arc welding (PAW) power cathode connects current signal detector and plasma gun respectively, first hf arc starter is set between plasma arc welding (PAW) power cathode and plasma gun, plasma arc welding (PAW) positive source connects workpiece to be welded, pole connection signal controller and the tungsten argon arc welding gun respectively of tungsten argon arc power supply, second hf arc starter is set between tungsten argon arc power supply and tungsten argon arc welding gun, another pole of tungsten argon arc power supply connects workpiece to be welded, plasma gun is towards position to be welded, the angle of tungsten argon arc welding gun in the side of plasma gun and between tungsten argon arc welding gun and plasma arc axis is 25 °-75 °,
(2) plasma arc welding (PAW) power supply and tungsten argon arc power supply is opened: start the first hf arc starter, ignite plasma arc welding (PAW) power supply, then starts the second hf arc starter, and ignite tungsten argon arc power supply;
(3) weld: utilize tungsten argon arc welding gun at front cleaning surface of the work oxide-film to be welded, utilize plasma gun after carry out welding thus making appearance of weld; In welding process, detect when direct current plasma arc current is in pulse base value arc maintenance through current signal detector, through signal processor start pulse signal controller, regulate tungsten argon arc electric current to be the cleaning that peak value carries out surface of the work oxide-film to be welded; When direct current plasma arc current is the peak value of pulse welding stage, regulates tungsten argon arc electric current to be in pulse base value by pulse signal controller and export, so repeatedly.
2. the aluminium alloy direct current plasma-tungsten argon arc complex welding method controlled based on pulse matching according to claim 1, it is characterized in that: when tungsten argon arc power supply is dc source, the positive pole connection signal controller of tungsten argon arc power supply and tungsten argon arc welding gun; When tungsten argon arc power supply is AC power, the negative pole connection signal controller of tungsten argon arc power supply and tungsten argon arc welding gun, be in series with electric capacity between the positive pole of tungsten argon arc power supply and workpiece to be welded, be in series with inductance between the positive pole of plasma arc welding (PAW) power supply and workpiece to be welded.
3. the aluminium alloy direct current plasma-tungsten argon arc complex welding method controlled based on pulse matching according to claim 1 and 2, it is characterized in that: welding equipment also comprises filler wire, tungsten argon arc welding gun and filler wire are positioned over the both sides, front and back of plasma gun or are positioned over the left and right sides of plasma gun, and argon-arc welding gun and the angle between filler wire and plasma arc axis are 25 °-75 °.
4. the aluminium alloy direct current plasma-tungsten argon arc complex welding method controlled based on pulse matching according to claim 1 and 2, it is characterized in that: plasma arc welding (PAW) power supply background current is 10-100A, peak point current is 50-500A, pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; Tungsten argon arc power supply background current is 5-50A, and peak point current is 20-200A, and pulse frequency is consistent with plasma arc welding (PAW) supply frequency, shielding gas flow amount 1.0-15L/min; The tungsten electrode diameter of tungsten argon arc welding gun is 0.8-6.0mm, and speed of welding is 10-150cm/min; Plasma arc welding (PAW) power supply tungsten electrode neck-in is 0.5-3.0mm, the tungsten electrode of tungsten argon arc welding gun is 2.0-7.0mm apart from workpiece to be welded, plasma arc welding (PAW) power supply nozzle is apart from workpiece to be welded from being 1.0-8.0mm, and tungsten electrode and the plasma arc welding (PAW) power supply injector spacing of tungsten argon arc welding gun are 2-10mm.
5. the aluminium alloy direct current plasma-tungsten argon arc complex welding method controlled based on pulse matching according to claim 3, it is characterized in that: plasma arc welding (PAW) power supply background current is 10-100A, peak point current is 50-500A, pulse frequency is 10-500Hz, and ion-gas flow is between 0.5-3.0L/min; Tungsten argon arc power supply background current is 5-50A, and peak point current is 20-200A, and pulse frequency is consistent with plasma arc welding (PAW) supply frequency, shielding gas flow amount 1.0-15L/min; The tungsten electrode diameter of tungsten argon arc welding gun is 0.8-6.0mm, and speed of welding is 10-150cm/min; Plasma arc welding (PAW) power supply tungsten electrode neck-in is 0.5-3.0mm, the tungsten electrode of tungsten argon arc welding gun is 2.0-7.0mm apart from workpiece to be welded, plasma arc welding (PAW) power supply nozzle is apart from workpiece to be welded from being 1.0-8.0mm, and tungsten electrode and the plasma arc welding (PAW) power supply injector spacing of tungsten argon arc welding gun are 2-10mm; Filler wire diameter is 0.8-2.0mm, and wire feed rate is 1.0-10m/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310563610.8A CN103567652B (en) | 2013-11-14 | 2013-11-14 | Aluminum alloy direct current plasma-tungsten electrode argon arc hybrid welding method based on pulse coordination control |
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