CN103302380B - A kind of nonelectric droplet transfer branched composite arc welding device and method - Google Patents
A kind of nonelectric droplet transfer branched composite arc welding device and method Download PDFInfo
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Abstract
The present invention relates to a kind of nonelectric droplet transfer branched composite arc welding device and method, this device is under the non-melt pole welding arc of smooth combustion, add a root wire from the side, electric power loop is not had between welding wire and workpiece, welding wire and tungsten electrode are connected to two outfans of a constant pressure source, the bypass bifurcated electric arc that ignites between welding wire and tungsten electrode carrys out filler wire, molten drop is formed after the fusing of welding wire end, molten drop grow up after bottom it and molten bath contact, flow into molten bath smoothly and depart from welding wire end, then periodically grow up, flow into molten bath, depart from, for a kind of complex welding method without the electricity droplet transfer.This droplet transfer mode has fundamentally stopped the generation of spatter, and this welding method can control the heat input to workpiece and deposition efficiency respectively simultaneously, it is achieved high-efficiency high-quality welds.
Description
Technical field
The present invention relates to a kind of composite arc welder without the electricity droplet transfer and method, it is specifically related to the welding of a kind of multielectrode bifurcated composite arc, belongs to welding field.
Background technology
Gas shielded arc welding is one of main welding method of the world today.During gas metal-arc welding welding, welding wire is constantly heated by the electric arc simultaneously, melts, and forms molten drop and to molten bath transition, and the base metals of fusing merges mutually, form weld seam after condensation.The melt-extracted steel fibre welding quality especially welding productivity of welding has direct impact.
The welding method of short circuiting transfer is a kind of important method in commercial production, particularly in all-position welding, relatively thin workpiece welding procedure in have a wide range of applications.Gas shielded arc welding is exactly typical short circuiting arc welding method, is the process of widely used low cost in the industrial production.But, short circuiting arc welding method also exists a serious shortcoming, it is simply that welding process is splashed very big.Spatter can cause welding quality to decline, affect attractive in appearance, deterioration labor condition and the contaminated environment of workpiece.Meanwhile, product also can be produced other harmful effects by spatter thing.
In order to realize without electricity droplet transfer and good metallurgical connection, Austrian Fronius company develops cold metal transfer welding (CMT) technology.Wire feed and Control Welding Process are directly connected by CMT technology first time.When digitized process control monitors a short-circuit signal, will feeding back to wire-feed motor, wire-feed motor gives a response pumpback welding wire, so that welding wire separates with molten drop.Under the control of total digitalization, this transient mode is different from traditional droplet transfer mode completely.The most outstanding feature of CMT technology is exactly low_input_power amount and without splashing transition.CMT technology achieves the droplet transfer under no current state.When short circuit current produces, namely welding wire halts and arc ignition, and molten drop enters molten bath to molten drop, and electric arc melting bath transition is extinguished, and electric current reduces automatically pumpback.In this fashion, the process of electric arc self input heat is very short, and short circuit occurs, and namely electric arc extinguish, and heat input promptly reduces.Namely whole welding process moves in circles in colding and heat succeed each other.The pumpback campaign of welding wire helps welding wire to separate with molten drop in the short-circuit state.By the control to short circuit, it is ensured that short circuit current is only small, so that the droplet transfer is without splashing.
Lincoln company of the U.S. developed STT new welding process method in recent years.STT is a kind of melting pole gas shielded arc welding with surface tension for molten drop major shift power.STT power supply has waveform and controls function, the different transient process according to molten drop, controls the waveform of electric current, voltage, and namely the source of welding current can be automatically adjusted welding current and arc voltage reaches the instantaneous heat quantity needed for electric arc.Guarantee the smooth combustion of welding arc and efficiently control appearance of weld.STT welding procedure characteristic: 1. arc burning is stable；2. striking is easy；3. flue dust and noise are little；4. splash minimum；5. appearance of weld is attractive in appearance；6. welding cost is relatively low；7. processing ease；8. welding efficiency is higher；
Both approaches reduces spatter to a certain extent, the problem fundamentally not solving to splash, and it controls complexity, and equipment price is higher, it is difficult to promote.
Summary of the invention
It is an object of the invention to propose a kind of nonelectric droplet transfer branched composite arc welding device and method, this device and method is welded as minor arc by non-melt pole, consumable electrode welding is as bypass bifurcated electric arc, two electric arcs interact and form composite arc welding, not only reduce the heat input to workpiece, and improve wire melting efficiency, make welding deposition rate be greatly improved, most importantly this device and method has fundamentally stopped the generation of spatter, and welding process is stable.
This invention takes following technical scheme.Under the non-melt pole welding arc of smooth combustion, add a root wire from the side, electric power loop is not had between welding wire and workpiece, welding wire and tungsten electrode are connected to two outfans of a constant pressure source, the bypass bifurcated electric arc that ignites between welding wire and tungsten electrode carrys out filler wire, molten drop is formed after the fusing of welding wire end, molten drop grow up after bottom it and molten bath contact, flow into molten bath smoothly and depart from welding wire end, then periodically grow up, flow into molten bath, depart from, for a kind of composite welding apparatus without the electricity droplet transfer and method.
Described nonelectric droplet transfer branched composite arc welding device and method, non-melt pole welding is as the minor arc of system, and consumable electrode welding is as the bypass bifurcated electric arc of system, and two electric arcs cooperatively form composite arc welding.Minor arc is based upon between non-melt pole and workpiece and melts workpiece, and bypass bifurcated electric arc is based upon between the welding wire of consumable electrode and tungsten electrode and carrys out filler wire, and bypass bifurcated electric arc is positioned at below minor arc, and angled with minor arc, and two electric arcs carry out cooperation；
Described nonelectric droplet transfer branched composite arc welding device and method; minor arc is non-melt pole welding gun; can connecing (GTAW) or the welding gun of Plasma Welding (PAW) for non-melt pole inert gas-shielded arc welding, minor arc is that constant current power supply is powered；
Described nonelectric droplet transfer branched composite arc welding device and method, bypass as melting pole gun, and other arc bifurcated electric arc is that constant voltage power supply is powered；
Described nonelectric droplet transfer branched composite arc welding device and method, the connected mode of minor arc is: tungsten electrode connects the negative terminal of power output end, and workpiece connects the anode of power output end；The connected mode of bypass bifurcated electric arc is: tungsten electrode connects the negative terminal of power output end, and welding wire connects the anode of power output end；
Described nonelectric droplet transfer branched composite arc welding device and method, electric power loop is not had between welding wire and workpiece, its molten drop process is that welding wire end forms molten drop after fusing under the effect of bypass bifurcated electric arc, molten drop grow up after bottom it and molten bath contact, flow into molten bath smoothly and also depart from welding wire end, then periodically grow up, flow into molten bath, departing from, whole transient process is steady, without splashing.
Compared with prior art, the bifurcated arc hybrid welding method that the present invention adopts has the advantage that
The 1 electric arc combined welding process of bifurcated is stable, produces without splashing, and arc stability is strong.
2 can control the heat input to workpiece and deposition efficiency respectively, it is achieved high-efficiency high-quality welds.
3 welding method costs are low, control simple, it is easy to accomplish, workable, it is possible to adapt to multiple environment, be widely used.
Accompanying drawing explanation
Accompanying drawing 1 is nonelectric droplet transfer branched composite arc welding method system connection diagram.
Accompanying drawing 2 is the droplet transfer high-speed camera (every pictures 0.01s interval time) in composite welding process.
In figure: 1, the tungsten electrode of non-melt pole welding gun, 2, the welding wire of melting pole gun, 3, workpiece, 4, constant voltage power supply, 5, constant current power supply, 6, minor arc, 7, bypass bifurcated electric arc, α, non-melt pole welding gun the angle of welding wire of tungsten electrode and melting pole gun, β, non-melt pole welding gun the angle of tungsten electrode and workpiece, 1.The picture number of the droplet transfer high-speed camera in composite welding process.
Detailed description of the invention
Below in conjunction with accompanying drawing, the example of the present invention being described in detail, this example is carried out under the premise of the technology of the present invention method, gives detailed implementation and shooting of concrete droplet transfer picture, but the protection domain of invention is not limited to following example.
Fig. 1 is nonelectric droplet transfer branched composite arc welding method system connection diagram.The non-melt pole welding arc that the tungsten electrode of non-melt pole welding gun 1 and workpiece 3 are formed is as the minor arc 6 of system, and the consumable electrode welding arc that the tungsten electrode of the welding wire of melting pole gun 2 and non-melt pole welding gun 1 is formed is as bypassing bifurcated electric arc 7.Minor arc 6 is powered for constant current power supply 5, mainly melts workpiece 3, and bypass bifurcated electric arc 7 is positioned at below minor arc 6, power for constant voltage power supply 4, mainly melting the welding wire of melting pole gun 2 θ angled with minor arc 6, two electric arcs interact and form composite arc welding；
Described nonelectric droplet transfer branched composite arc welding method, the connected mode of minor arc 6 is: the tungsten electrode of non-melt pole welding gun 1 connects the negative terminal of constant current power supply 5 outfan, and workpiece 3 connects the anode of constant current power supply 5 outfan；The connected mode of bypass bifurcated electric arc 7 is: the tungsten electrode of non-melt pole welding gun 1 connects the negative terminal of constant voltage power supply 4 power output end, and the welding wire of melting pole gun 2 connects the anode of constant voltage power supply 4 power output end；
The angle α of the welding wire of the tungsten electrode of non-melt pole welding gun 1 and melting pole gun 2 is 45 °, and the angle of the tungsten electrode of non-melt pole welding gun 1 and workpiece 3 is 90 °, and the output voltage of constant voltage power supply 4 is 14V, and electric current is 60A；The output electric current of constant current power supply 5 is 100A, and speed of welding is 0.7m/min (rice is per minute), and the protection gas of the tungsten electrode of non-melt pole welding gun 1 is argon, and throughput is 20L/min (Liter Per Minute).
Under the above parameters, the mechanically or chemically cleaning before first workpiece 3 being welded.Then ignite minor arc 6 between the tungsten electrode of non-melt pole welding gun 1 and workpiece 3, after waiting minor arc 6 smooth combustion, sends into the welding wire of melting pole gun 2, and ignite bypass bifurcated electric arc 7, and two electric arc generation coupling interactions carry out composite welding.
Accompanying drawing 2 is the droplet transfer high-speed camera in nonelectric droplet transfer branched composite arc welding process, wherein every pictures 0.01s interval time.1. picture is the beginning in the cycle of molten drop process, and picture is 1.For the growth process of molten drop, pictureMolten bath, picture is come into contact with bottom molten dropIn the inflow molten bath that molten drop is mild, pictureMolten drop departs from molten bath after all flowing into molten bath, then proceedes to next cycle process.By picture 1.Can significantly observe that whole droplet transfer process is steady, without splashing in welding process.
Claims (1)
1. adopting a welding method for nonelectric droplet transfer branched composite arc welding device, this device includes non-melt pole welding gun (1), melting pole gun (2), constant voltage power supply (4), constant current power supply (5)；Wherein, the non-melt pole welding arc that the tungsten electrode of non-melt pole welding gun (1) and workpiece (3) are formed is as the minor arc (6) of system, and the consumable electrode welding arc that the tungsten electrode of the welding wire of melting pole gun (2) and non-melt pole welding gun (1) is formed is as bypassing bifurcated electric arc (7)；The tungsten electrode of non-melt pole welding gun (1) connects the negative terminal of constant current power supply (5) outfan, and workpiece (3) connects the anode of constant current power supply (5) outfan；The tungsten electrode of non-melt pole welding gun (1) connects the negative terminal of constant voltage power supply (4) power output end, and the welding wire of melting pole gun (2) connects the anode of constant voltage power supply (4) power output end；It is characterized in that: minor arc (6) is used for melting workpiece (3), bypass bifurcated electric arc (7) is for filler wire, bypass bifurcated electric arc (7) is positioned at minor arc (6) lower section, and it is angled with minor arc (6), two electric arcs interact and form the welding of bifurcated composite arc, welding wire end forms molten drop after fusing under the effect of bypass bifurcated electric arc, molten drop grow up after bottom it and molten bath contact, flow into molten bath smoothly and depart from welding wire end, then periodically grow up, and combine with workpiece (3)；Melting pole gun (2) and workpiece (3) do not have electric power loop, namely without the electricity droplet transfer；The angle of the tungsten electrode of described non-melt pole welding gun (1) and the welding wire of melting pole gun (2) is set to 45 °, and the angle of the tungsten electrode of non-melt pole welding gun (1) and workpiece (3) is set to 90 °；The output voltage of constant voltage power supply (4) is 14V, and electric current is 60A；The output electric current of constant current power supply (5) is 100A, and speed of welding is 0.7m/min, and the protection gas of the tungsten electrode of non-melt pole welding gun (1) is argon, and throughput is 20L/min；The arc energy of minor arc and bypass bifurcated electric arc is independently adjusted, thus heat input and wire melting efficiency to workpiece individually control.
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| CN104493368B (en) * | 2014-11-25 | 2017-02-22 | 哈尔滨工程大学 | Plasma-melting electrode electric arc dynamic composite welding device and welding method thereof |
| CN105290576A (en) * | 2015-09-29 | 2016-02-03 | 湘潭大学 | Real-time detecting method and device for surface topography of swing arc MAG welding molten pool |
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| CN105149751B (en) * | 2015-10-14 | 2017-08-25 | 刘昇澔 | It is a kind of while having the welding system and its welding method of consumable electrode and non-melt pole |
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| US9233432B2 (en) * | 2007-02-12 | 2016-01-12 | Yu Ming Zhang | Arc welder and related system |
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| CN101972879B (en) * | 2010-11-12 | 2012-12-19 | 哈尔滨工业大学 | Compound electric arc welding method |
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