CN104661781A

CN104661781A - Method and system to start and stop a hot wire system

Info

Publication number: CN104661781A
Application number: CN201380049254.6A
Authority: CN
Inventors: S·R·彼得斯; P·E·丹尼; M·D·莱特萨
Original assignee: Lincoln Global Inc
Current assignee: Lincoln Global Inc
Priority date: 2012-07-20
Filing date: 2013-07-19
Publication date: 2015-05-27
Also published as: JP2015522426A; DE112013003613T5; KR20150038016A; BR112015001243A2; WO2014013322A2; WO2014013322A3

Abstract

A method and a system (100) to start and/or stop a hot wire (140) process. A hot wire system includes a filler wire feeder (180) that includes a contact tube (160) for holding a filler wire (140), a wire feed mechanism, a power supply (130, 170) for applying a heating current to the wire; and a controller (180) coupled to the feed mechanism and the power supply (130, 170). The controller (180) is configured for regulating the heating current to the wire (140) and locating the wire (140) with respect to the workpiece (115) for forming a molten puddle (116, 117) with an arc to initiate a hot wire process (280, 380). The controller (180) may also be configured to regulate the feed of the wire (140) to the molten puddle (116, 117) and one of regulate and/or pulse the current to the wire (140) so as to retract the wire (140) out of the molten puddle (116, 117) in a stable manner when stopping the hot wire process (280, 380).

Description

Start and stop the method and system of hot weld silk system

The application is the U.S. Patent application No.13/212 that requirement is submitted on August 17th, 2011, the part continuation application of the rights and interests of the priority of 025, described U.S. Patent application No.13/212,025 is the U.S. Patent application No.12/352 submitted on January 13rd, 2009, and the part of 667 continues; Described U.S. Patent application No.13/212,025 and described U.S. Patent application No.12/352, the full content of 667 is merged in by reference.

Invention field

The present invention relates to the method for the hot welding wire process of startup according to claim 1, according to the hot weld silk system of claim 11 and 14 and the method for the hot welding wire process of stopping according to claim 15.The invention relate generally to of this theme is used for the system and method starting and/or stop the hot welding wire process such as used in cladding (overlaying), welding and/or other joint (joining) application.More particularly, some embodiment relates to the system and method that the controlled filler wire feeder that uses and combine with high strength energy source and energy source system start and/or stop hot welding wire process, any one in applying for cladding, joint and welding.

Technical background

In hot weld silk or filler wire technique, high strength energy source (e.g., such as laser instrument, not consumable tungsten electrode or other high-energy electric arc or plasma process) is used to heat and melts workpiece to form molten bath.Filler wire is advanced by towards workpiece and molten bath.Welding wire carrys out resistance heated (resistance-heated) by independent energy source, with make welding wire close to or reach its fusing point and contact molten bath.The welding wire of heating is advanced in molten bath for the hot welding wire process of execution.Thus filler wire is displaced through to be melted in molten bath by filler wire simply occurs to molten bath.Alternatively, when welding wire enters molten bath, filler wire can be solid-state.Such as, when filler wire enters molten bath, the filler wire of 30% can be solid-state.Because filler wire is pre-heated to or close to its fusing point, its existence in molten bath can not cool significantly or solidify molten bath but be promptly depleted in molten bath.Initiate or stop hot welding wire process problem to be in the appearance introducing welding wire respectively or splash from welding wire during the retraction welding wire of molten bath.Before molten bath is fully formed, molten bath is unstable, and this causes welding wire to splash when welding wire is incorporated in molten bath.As illustrated in fig. 7, when welding wire is introduced, the unstability in molten bath can be found out in the voltage of hot welding wire process, electric current or power traces.Illustrated in fig. 7 is vibration when known hot welding wire process starts in voltage/current/power traces.Vibration in Voltage trace is because the repetition arcing events caused due to the incompletely formed of molten bath between welding wire and workpiece at least partly.At the end of hot welding wire process, welding wire is maintained to avoid welding wire to splash in molten bath, but in order to welding wire and molten bath be separated, hot welding wire process must stop and cutting off welding wire.Thus, for starting and/or stopping there are such needs for hot welding wire process, namely minimize when introducing welding wire or from welding wire being splashed during the retraction welding wire of molten bath.

By by means that are routine, traditional and that proposed with as in the remainder of the application with reference to accompanying drawing compared with embodiment of the present invention of being set forth, the further limitation of means so for a person skilled in the art and shortcoming will become obvious.

Summary of the invention

Target of the present invention to overcome these restriction and shortcomings.The method of the method for this problem by the hot welding wire process of startup according to claim 1, the hot weld silk system according to claim 11 and 14 and the hot welding wire process of stopping according to claim 15 solving.The preferred embodiments of the invention are themes of dependent claims.Embodiment of the present invention comprise the system and method starting and stop combination filler wire feeder and energy source system.First embodiment of the invention provides the method for the hot welding wire process between filler wire and workpiece.The method of this theme has initiation process, and described initiation process is included between welding wire and workpiece and sets up electric arc to form molten bath within the workpiece; The high strength energy source separated with welding wire is utilized to keep molten bath; Based on setting up arc voltage and heating current being applied to welding wire, welding wire is advanced in molten bath, to stop electric arc and to make welding wire close to its fusing point for hot welding wire process.According to the further embodiment of method, sensing signal is the open-circuit voltage of at least 3 volts.According to the further embodiment of method, high strength energy source is voltaic arc generating device.Also solved by hot weld silk system according to problem of the present invention, described hot weld silk system comprises the feeder for the distal end portion relative to workpiece propelling and retraction filler wire.System comprises power supply unit further, and described power supply unit is used for sensing signal, electric arc generation current and heating current to be applied to described welding wire.System comprises controller further, and described controller is coupled to described feeder and described power supply unit, for initiating hot welding wire process.Described controller is relative to welding wire described in described workpiece setting and to regulate in sensing signal each.Electric arc produces signal and heating current and comprises: advance the described distal end portion of described welding wire towards described workpiece and regulate described sensing signal, so as to determine described distal end portion when with described absorption surface.System comprise further from described workpiece retract described welding wire described distal end portion and regulate described electric arc generation current, to form electric arc to form molten bath between described distal end portion and described workpiece.System comprises further and to be advanced to by described welding wire in described molten bath and to regulate described heating current, so that by described wire melting in described molten bath.System comprises high strength energy source further, and heat is provided to described molten bath by described high strength energy source.According to the preferred embodiment of system, power supply unit comprises multiple power supply, and described multiple power supply comprises the first power supply for applying sensing signal, for applying the second source of electric arc generation current and the 3rd power supply for applying heating current.

Another embodiment provides the method stopping hot welding wire process, and described hot welding wire process has wire melting to the heating current in the molten bath of workpiece.Method of shutting down comprises and reduces described welding wire to the rate of sending in described molten bath and utilize high strength energy source to keep described molten bath.Method of shutting down comprises in one aspect further: stop described heating current and current impulse is applied to described welding wire, shifts out from described molten bath to make the described distal end portion of described welding wire.Another or interchangeable aspect of method of shutting down comprise described welding wire of retracting from described molten bath, sense the formation of the electric arc between described welding wire and described workpiece, and before described electric arc is formed, is terminated to the described heating current of described welding wire.Method of shutting down again another or interchangeable in, described welding wire is retracted from described molten bath, at least some in wherein said heating current is applied to described welding wire, disconnects to make described welding wire and separates with described molten bath, to leave a welding wire extension in described molten bath.Energy from described high strength energy source is applied to described welding wire extension to be melted in described molten bath described extension.

From following description and accompanying drawing, these and other features of the present invention for required protection and the details of embodiment of the present invention illustrated will more intactly be understood.

brief Description Of Drawings

Describe exemplary of the present invention in detail by referring to accompanying drawing, above-mentioned and/or other aspects of the present invention will be more obvious, in the drawing:

Fig. 1 illustrates the functional schematic block diagram of the exemplary of hot weld silk system;

Figure 1A is the detailed axonometric view of the hot welding wire process of the system using Fig. 1;

Fig. 2 illustrates the flow chart of the first embodiment of the starting method of the hot welding wire process of the system using Fig. 1;

Fig. 3 illustrates the flow chart of the second embodiment of the starting method of the hot welding wire process of the system using Fig. 1;

Fig. 4 illustrates the flow chart of the first embodiment of the method for shutting down of the hot welding wire process of the system using Fig. 1;

Fig. 5 illustrates the flow chart of the second embodiment of the method for shutting down of the hot welding wire process of the system using Fig. 1.

Fig. 6 illustrates the flow chart of the 3rd embodiment of the method for shutting down of the hot welding wire process of the system using Fig. 1.

Fig. 7 illustrates the trace of voltage, electric current and power in the hot welding wire process of prior art.

describe in detail

By referring to appended accompanying drawing, exemplary of the present invention will be described below now.The present invention is understood in described exemplary intention help, and is not intended to limit the scope of the invention by any way.Similar Ref. No. in the whole text in relate to similar key element.

Fig. 1 illustrates the functional schematic block diagram of the exemplary of the system 100 for performing hot welding wire process.Term " hot welding wire process " is used in the mode of broad sense herein, and can relate to any application comprising cladding, welding or joint.More particularly, hot welding wire process comprise heating filler wire (such as making to be heated by resistive) perform cladding, welding and/or joint technology.Melting and coating process can comprise soldering (brazing), deposition (cladding), built-up welding (buildingup), fill and Surface hardened layer (hard-facing).Such as, in " soldering " application, fill metal and be distributed on by capillarity between close-fitting (closely fitting) surface of seam.But, in " solder brazing (brazewelding) " application, fill metal and be formed to flow into space.But as used herein, these two kinds of technology are all broadly called that cladding is applied.System 100 comprises hot filler wire feeder subsystem, and described hot filler wire feeder subsystem can provide at least one filler wire 140 that is heated, to contact with workpiece 115.Certainly, understanding, about workpiece 115 herein, the molten bath 116 formed in workpiece is considered to a part for workpiece 115, therefore with regard to presented any molten bath, relates to contact with workpiece 115 and comprises and molten bath contact.

Hot filler wire feeder subsystem comprises filler wire feeder 150, contact tube (contact tube) 160 and hot weld silk power supply unit 170.Welding wire 140 is sent to by towards workpiece 115 from filler wire feeder 150 by contact tube 160, and extends beyond pipe 160.Hot weld silk power supply unit 170 can be pulse direct current (DC) power supply unit, although the power supply unit exchanging (AC) or other types is also possible.Thus power supply unit 170 can be operated to any one in voltage or current signal to be applied to welding wire 140.Although power supply unit 170 can comprise single power supply or more than one power supply, to apply various electric current as described in more detail below or to set up various voltage.It should be noted, although accompanying drawing herein and discussion relate to " welding wire (wire) " 140, this is usually intended to mean running stores, described running stores can be the welding wires (it can be solid-state or have core) of column traditionally or also can be strip running stores, such as, be generally used for the type of deposition.But for clarity sake, running stores 140 will be called as herein " welding wire ".

Below an aspect of the startup technique of this theme in greater detail, power supply unit 170 is operated to sensing signal is applied to welding wire 140 to determine the degree of approach of welding wire to workpiece.The method of this theme another in, electric current is applied to welding wire by power supply unit, and described electric current enough comes to set up electric arc between welding wire and workpiece.Again in another, the electric current of filler wire 140 origin self-heating welding wire power supply unit 170 carrys out resistance heated, and described hot weld silk power supply unit 170 is operatively coupled between contact tube 160 and workpiece 115.

Example system 100 also comprises RACS 195, and described RACS 195 can potential difference (that is, voltage V) between measuring workpieces 115 and hot weld silk 140 and the electric current (I) by workpiece 115 and hot weld silk 140.In at least one exemplary, RACS 195 (it can be specially the current sense controller based on state) is operably connected to workpiece 115, contact tube 160 and hot weld silk power supply unit 170, to regulate the function of power supply unit, as, such as output current, voltage and/or power.RACS 195 can comprise second or parallel controller regulates or other aspects of monitoring system and/or hot welding wire process, e.g., such as institute laser subsystem, welding wire or molten bath in greater detail below.Thus exemplary sensing and current control subsystem 195 can further from anomalous integral derivative calculations resistance value (R=V/I) and/or the performance numbers (P=V*I) of measured voltage and current and voltage, electric current and power.Generally speaking, when hot weld silk 140 contacts with workpiece 115, the potential difference between hot weld silk 140 and workpiece 115 is zero volt or closely zero volt.Thus, as being described in detail after a while in the text, with current control subsystem 195, sensing can sense when resistive filler wire 140 contacts with workpiece 115.And, as below together with one or more aspects of the start/stop method of this theme in greater detail, control device subsystem 195 is connected to hot weld silk power supply unit 170 by it, the electric current that can control by resistive filler wire 140 in response to this sensing.

In exemplary illustrated in fig. 1, system 100 also comprises laser subsystem, and laser beam 110 can be focused on workpiece 115 heated parts 115 such as molten bath is remained on workpiece by described laser subsystem.Laser subsystem comprises the laser aid 120 and Laser Power Devices supply 130 that are operationally connected to each other.Laser Power Devices supply 130 provides power to operate laser aid 120.Controller (as, such as second based on the controller of parallel state, its part as RACS 195 or separate with RACS 195), the function regulating Laser Power Devices supply 130 can be provided to, described function can comprise each the real-time output of such as electric current, voltage or power, or for the simultaneously operating with hot weld silk power supply unit 170.Laser subsystem can be the high energy laser source of any type, includes but not limited to carbon dioxide, Nd:YAG, Yb-sheet (disk), YB-optical fiber, optical fiber transmission or direct diode laser system.More generally, laser subsystem also can be high strength energy source.Although high strength energy source is described to the laser subsystem with laser beam and power supply unit, it should be understood that any high strength energy source can be used.Such as, high strength energy source can provide at least 500W/cm ².Other embodiments of high strength energy source can comprise at least one in electron beam, plasma arc welding (PAW) subsystem, gas-tungsten arc welding subsystem, gas metal arc welding subsystem, flux core arc-welding subsystem and the submerged-arc welding subsystem playing the effect of high strength energy source.

For welding application for, laser beam 110 is enough strong in its energy, with melt in the base metal of workpiece 115 some and/or welding wire 140 is melted on workpiece 115.For the embodiment of the method for described herein theme, laser beam 110 in the mode coordinated mutually with the situation of filler wire 140 to keep molten bath.Power supply unit 170 is configured to the most of energy provided required for resistance heated filler wire 140, to perform hot welding wire process., but as herein about described by specific embodiment, power supply unit 170 and feeder subsystem are controlled and operate to initiate hot welding wire process, and more particularly, initiate the formation in the molten bath in workpiece 115 further.In addition, power supply unit 170 and feeder subsystem are configured to stop hot welding wire process, to provide separating of welding wire and molten bath.

System 100 also comprises motion control subsystem, this subsystem can along workpiece 115 with equidirectional 125 (being at least comparatively speaking) mobile laser beam 110 (energy source) and resistive filler wire 140, thus laser beam 110 and resistive filler wire 140 to remain be relative to each other fixing relation.Relative motion between workpiece 115 and laser/welding wire combination can realize by real travelling workpiece 115 or by moving laser device 120 and hot weld silk conveyer subsystem.Such as, as seen in Figure 1, motion control subsystem comprises the motion controller 180 being operably connected to robot 190.The motion of motion controller 180 control 190.Robot is operably connected (such as, mechanically fixing) to workpiece 115, and with travelling workpiece 115 on direction 125, thus laser beam 110 and welding wire 140 move effectively along workpiece 115.According to embodiment of the present invention, motion controller 180 can also be operably connected Laser Power Devices supply 130 and/or sensing and current controller 195.By this way, motion controller 180 can intercom mutually with Laser Power Devices supply 130, with the activity between each subsystem of coherent system 100.

Although it is noted that Fig. 1 (and Figure 1A discussed below) describes the upstream (on direct of travel) that thermal source (laser instrument) is positioned at hot weld silk, embodiment of the present invention are unrestricted in this regard.Particularly, hot weld silk can enter molten bath in the upstream of thermal source during technique.

Further, as previously described, although laser system is illustrated in Fig. 1 and Figure 1A, embodiment of the present invention are not limited to the use of laser system.Particularly, as previously described, embodiment of the present invention can also use not consumable tungsten electrode or other can by any one in the high-energy electric arc that uses or plasma process.Such as, in an exemplary embodiment of the present invention, Laser Power Devices supply 130 and laser instrument 120 can be replaced with GMAW power supply unit and welding torch, are used to create molten bath to make MIG or GMAW technique.In such embodiments, MIG/GMAW technique will create molten bath, and hot welding wire process by as disclosed herein with discuss carry out.For the object of efficiency, exemplary discussed below may relate to laser subsystem, but this is intended that exemplary, because how no matter create the high-power energy source in molten bath, the control of system 100 described herein, integration and operation are similar.

Shown by Figure 1A is the detailed view of the hot welding wire process of the position in molten bath 116 on workpiece 115.What more specifically illustrate is keep the laser beam 110 in molten bath 116 and be set up and be advanced to the filler wire 140 be heated in molten bath 116.Usually, the embodiment starting the method for hot welding wire process provides filler wire 140 to take the position close to workpiece 115 to and formed between filler wire 140 and workpiece 115 and enough melts workpiece and the electric arc forming molten bath 116.Along with the molten bath 116 of stable formation state, be lowered to such level to the electric current in welding wire, described level enough melts or almost filler wire, but does not enough provide the electric arc between welding wire and workpiece.Instead, laser instrument keeps the formation in molten bath and welding wire is advanced in molten bath and has carried out hot welding wire process.Thus, in of technique of this theme is specific, solder wire material occurs by this way to the stable transfer in molten bath 116, namely by direct filler wire 140 in process, and more particularly, be not by by the material droplet transitions from welding wire to molten bath.

The stability in molten bath 116 can be determined by round-about way, and described round-about way can comprise such as wire speed, voltage or current feedback.More specifically, when hot welding wire process starts, feeder 150 ramps up to desired and known feed rate of welding wire, can determine the amount of the welding wire be fed in molten bath and the size in molten bath 116 thus.From amount and the pool size of the welding wire be fed to molten bath 116, the desired start-up point starting hot welding wire process can be determined.In other words, the amount of desired welding wire has been added to molten bath 116, and pool size can calculate based on all welding wires be melted in molten bath.For given pool size, molten bath prepares for stable hot welding wire process.In addition or alternatively, the virtual voltage exported from power supply unit and/or the feedback of electric current can indicate stable molten bath to be formed.Further alternatively, molten bath forms the historical data of institute elapsed time or experience can be used.

As further described below, the electric arc of hot weld silk technology utilization between welding wire 140 and workpiece 116 of this theme starts, to form molten bath 117.Thus in one aspect, hot welding wire process is initiated for the short arc transfer mode of molten bath formation or technology between welding wire and workpiece by adopting.The instruction that time between the stability of specific short circuit event or short circuit event can provide stable molten bath to be formed.Stable molten bath 116 can be implemented, and the electric arc wherein between welding wire 140 and workpiece 115 causes enough greatly the lasting change in the molten bath profile (that is, width, thickness, volume etc.) in molten bath 116.

When heat input reaches peak value and micro-electric arc starts, " flash of light (flash) " of micro-electric arc may cause the ripple in molten bath, if so that enough large, ripple is frozen in molten bath.In one aspect, arc stiffness and/or heat input so large to such an extent as to it material " can be freezed " blow out molten bath and molten bath is thinning.This special approach makes hot weld silk start technique and does not rely on speed or other conditions.

In another embodiment; hot welding wire process and molten bath are formed can to adopt the pulse technique of Self Adaptive Control to initiate; described pulse technique is such as used in the pulse gas-shielded metallic arc welding (GMAW-P) of The Lincoln Electric Company; described pulse gas-shielded metallic arc welding (GMAW-P) is shown and described in the open NX-2.70 of the Lincoln Electric wave control technology being entitled as " technique: impulse jet metal transfer " (in August, 2004), and described disclosed full content is merged in by reference.The waveform instruction oblique ascension of the Self Adaptive Control adopted between welding wire and workpiece stable or reach time of desired value with the voltage of peak value or voltage.Further alternatively, counting or the desired current value of number of pulses can be determined, this counting or current value indirectly can indicate feed rate of welding wire and molten bath is stable point for the hot welding wire process of initiation.

Fig. 2 more specifically illustrates an embodiment of the starting method 200 used by the system 100 of Fig. 1.In step 210, sensing voltage is set up by power supply 170; And in step 220, the distal end portion of at least one filler wire 140 is advanced by towards workpiece 115 by wire feeder 150.In a specific embodiment, owing to being applied to the cause of the sensing signal of welding wire 140 under the order of RACS 195 by welding wire power supply unit 170, sensing voltage is open-circuit voltage (OCV).Such as, sensing and current controller 195 can set up such sensing voltage by order hot weld silk power supply unit 170, e.g., and such as, open circuit sensing voltage in 24 to 70 volt range.But in other exemplary, less sensing voltage can be used.Such as, sensing voltage can in the scope of 3 to 15 volts.In another exemplary embodiment, sensing voltage is in the scope of 5 to 8 volts in the scope of 5 to 15 volts and in another embodiment again.

In specific at one or in embodiment, sensing voltage can according to the type of welding wire 140.Such as, the sensing voltage for stainless welding wire can be set in the scope of 6 to 9 volts.In higher nickel bare welding filter metal (having higher resistance), sensing voltage can be set at voltage high a little or operate with voltage high a little; Steel is low a little.Alternatively, such as, the suitable sensing voltage outside 5 to 15 volt range can be used, and wherein welding wire 140 has outer cover the larger of thing and extrude welding wire, describedly covers that thing is not the same with welding wire core to conduct electricity outward.Under these circumstances, sensing voltage can up to 20 volts.Thus suitable sensing voltage can limit threshold voltage, more than described threshold voltage, between welding wire 140 and workpiece 115, there is electric arc, and below described threshold voltage, electric current can be lowered or cut off to get back to " hot weld silk " conditioned disjunction level.

In addition, in an exemplary embodiment of the present invention, the sensing signal applied does not provide the enough energy heating welding wire 140 significantly.Exemplary sensing signal being applied to the power supply of filler wire is shown and described in U.S. Patent Publication No.2010/0176109, and the full content of described U.S. Patent Publication No.2010/0176109 is merged in by reference.Certainly, in other embodiments, at least some heating can occur when sensing signal/voltage is applied in.

Refer again to Fig. 2, when welding wire is advanced towards workpiece 115, sensing or voltage signal monitored, with make the change in voltage can be formed between welding wire 140 and workpiece 115 contact time be detected.As described above, in some embodiments, wherein the distal end portion of welding wire 140 and workpiece 115 separate, and measured OCV will more than 3 volts.In the first determining step 230 of starting method, whether formed to contact to make with workpiece 115 to the distal end portion of welding wire and determined.Such sensing can have been come with the change in the potential difference measurement between filler wire 140 and workpiece 115 or monitoring OCV by sensing and current controller 195.When the distal end portion of filler wire 140 and workpiece 115 short circuit (that is, formed with workpiece contact), voltage will drop to or close to zero volt.In other words, such as, when welding wire and workpiece formed contact time, the voltage sensed can drop to or close to zero volt.In some example embodiments, set up contact between welding wire and workpiece before, starting method provides and repeatedly sensing voltage is applied to welding wire, to make until welding wire contact workpiece just has electric current.More specifically, power supply unit 170 is opened with sensing level, and when welding wire 140 is advanced towards workpiece 115, the virtual voltage between welding wire 140 and workpiece 115 is monitored.Sensing voltage or signal are in such level, and to make when welding wire forms the degree of contact to current flowing, it is only current sensor.Once welding wire 140 contacts workpiece 115, then there is not "ON" road voltage, and thus, the voltage of monitoring goes to zero.In further exemplary, voltage is monitored determines whether it drops to below contact threshold level.Such as, controller 195 can have the contact detection level of 1 volt, during to make below voltage drop to this threshold level, it is well established that contact has been formed or has been about to be formed, and further event described below thus triggering.

Other indirect methods can be used in step 230, to determine the contact between welding wire 140 and workpiece 115.Such as, other contact indicating methods can comprise the promotion resistance of sensing to welding wire.

Contact once welding wire 140 has been formed with workpiece 115, then in retraction step 240, controller 195 cuts out sensing signal and welding wire is retracted from workpiece.Therefore, based on to the detection with absorption surface, welding wire 140 is contracted and sensing signal is closed.In some embodiments, welding wire 140 can be retracted into the time of predetermined distance or retraction predetermined volume with the speed of setting.When welding wire retraction operation starts, electric current is provided to welding wire.This electric current can be that electric arc creates electric current or is less than the electric current that electric arc creates levels of current.As a part for electric arc forming step 250, welding wire 140 starts to retract, and gap is formed between welding wire 140 and workpiece 115.When starting when retracting, electric arc creates electric current and is provided to welding wire 140 by power supply unit 170.(it is noted that electric arc create electric current can welding wire retract be initiated not long ago, simultaneously or be provided soon afterwards.) when welding wire 140 is contracted away from surface, electric arc creates electric current and create electric arc between welding wire 140 and workpiece/molten bath.

In one of the method for this theme, electric arc creates current range from about 5 amperes to about 30 amperes, to provide the coating-forming voltage of the electric arc between welding wire 140 and workpiece 115.In another exemplary embodiment, current range is between 10 amperes and 25 are pacified doubly.In yet another aspect, be provided under the constant current control method of electric arc generation current between controller 195 and power supply unit 170.In such embodiments, electric arc generation current level be predetermined and power supply unit 170 keep described levels of current until such time, namely electric arc is established between welding wire 140 and workpiece 115.The arc current provided can use GMAW short arc or impulse type welding procedure to provide.

It should be noted, electric arc generation current can be applied in immediately after sensing signal is stopped, and is transformed into electric arc immediately produces signal to make sensing signal.In other exemplary, the time interval that the stopping of sensing signal and electric arc produce between signal can exist.When electric arc generation current is applied in, welding wire 140 is still being contracted until in such, and namely electric arc is created and is detected.In an exemplary embodiment of the present invention, the voltage between welding wire 140 and workpiece 115 is monitored, and to make when voltage reaches electric arc generation level, controller 195 determines that electric arc is created.Therefore, when this arc-detection voltage threshold is reached, it is well established that electric arc is created.

Once arc-detection voltage threshold is reached---the establishment of instruction electric arc, the retraction of welding wire 140 is stopped, and molten bath starts to be formed, and welding wire is advanced towards workpiece 115 again.When molten bath starts formed and stablize, welding wire 140 can be pushed into.In some embodiments, the detection of electric arc and the duration again between propelling are in the scope of 50 to 500 milliseconds.This propelling and electric arc control to be similar to the propelling and control that GMAW short arc or impulse type welding procedure use.In an exemplary embodiment, when welding wire 140 is when advancing, electric arc is then kept a certain amount of time, and the described time enough sets up and has enough sizes and stable molten bath.Such as, in some example embodiments, electric arc generation current is kept one predetermined period after electric arc is established.After the time period ends, assuming that molten bath is created.In an exemplary embodiment, predetermined the sands are running out is in 300 milliseconds (ms), and in other exemplary, predetermined the sands are running out is in 100ms.

In other exemplary of starting method, the second determining step 260 can be utilized, and described second determining step 260 is for the formation monitoring workpiece 115 in molten bath 116.In such step, the surface of workpiece 115 is monitored determines whether molten bath is created and whether molten bath reaches enough sizes or level of stability.Such as, the high speed camera with electronic shutter can be used to the width assessing molten bath.More specifically, high speed video can be used to observe change in molten bath/deposition profile to determine weld pool stability.In another embodiment, weld pool stability is determined by round-about way.Such as, power supply 130 produces the electric current and/or voltage of monitoring between welding wire 140 and workpiece 115 based on electric arc.Voltage and current fluctuation or vibration are until molten bath is stablized.Thus weld pool stability or can not have substantial vibration like this to indicate by the stable of electric current and voltage.In such embodiments, molten bath is monitored until determined that stable molten bath is formed satisfactorily, and this embodiment of starting method 200 provides the electric arc kept between welding wire 114 and workpiece 115.In some example embodiments, molten bath monitoring method can replace monitoring electric arc produce voltage levvl and be utilized, and so, either method can be used to determine separately or together when molten bath is created fully.

Once determined stable molten bath on workpiece 115 formed and/or electric arc be created after a period of time terminate, when welding wire 140 is advanced in molten bath 116, electric arc generation current is stopped and heating current power is provided to welding wire 140.Welding wire is advanced in molten bath with desired feed rate of welding wire.This occurs in step 270.More specifically, once determine that the electric arc between welding wire 140 and workpiece 115 forms stable molten bath 116 at workpiece 115, the retraction of welding wire 140 is stopped and in forward step 270a, welding wire is again advanced towards workpiece 115 and is advanced in molten bath 116.Meanwhile, in welding wire heating steps 270b, heating current is continuously applied to welding wire 140 from power supply 170 or independent hot weld silk power supply.In one embodiment, heating current forms below threshold level at electric arc.In certain embodiments, welding wire heating current forms below threshold value, e.g., such as, below 10-20 volt at electric arc.During hot welding wire process, electric arc can produce, but hot weld silk power supply extinguish arcs before electric arc can make hot welding wire process instability.But welding wire 140 is enough heated to or close to its fusion temperature by electric arc heated electric current.

In order to keep the stability in molten bath during hot welding wire process, keep in step 270c in molten bath, high strength thermal source (such as, laser beam 110 or GMAW electric arc) is applied to molten bath.In various exemplary, during start-up course, light beam 110 (or other thermals source) can be provided to molten bath with the time of change.Such as, in some embodiments, light beam 110 can start-up course start be opened, or can contact be detected after be opened, or can be opened after electric arc is created, or can be opened after electric arc generation current is cut-off.Along with the stable of molten bath 116 and continued or be periodically fed in molten bath be in or close to the filler wire 140 of the fusion temperature of welding wire, starting method completes and hot welding wire process 280 can be performed, as, such as shown in U.S. Patent Publication No.2011/0297658 or U.S. Patent Publication No.2010/0176109 and describe hot welding wire process, each full content in described U.S. Patent Publication No.2011/0297658 and U.S. Patent Publication No.2010/0176109 is merged in by reference.

In the interchangeable embodiment of starting method 300, as illustrated in fig. 3, replace the formation determining molten bath in the second determining step, interchangeable method provides the electric arc determining to set up between filler wire 140 and workpiece 115 whether to exceed threshold value.More specifically, interchangeable starting method provides the initial step 310 setting up sensing voltage in mode described before.Whether, in forward step 320, the distal end portion of resistive filler wire 140 is advanced by towards workpiece 115, and in the first determining step 330, formed to contact to make with workpiece 115 determine the distal end portion of welding wire.Again, when the distal end portion of filler wire 140 and workpiece 115 short circuit (that is, formed with workpiece contact), voltage will drop to below contact threshold voltage level.Thus, when welding wire and workpiece formed contact time, measured voltage signal is zero or is approximately zero.Until the contact between welding wire and workpiece is determined, when welding wire 140 is advanced towards workpiece 115, starting method 300 provides to be set up repeatedly or keeps and monitoring voltage (such as, OCV).

The same with starting method 200 described before, contact once welding wire 140 has been formed with workpiece 115, in retraction step 340, welding wire is retracted from workpiece, and sensing voltage signal is stopped, and electric arc generation current is applied to welding wire 140.Under the method for this theme, in electric arc forming step 350, welding wire 140 to be retracted and electric current is increased and/or applies until electric arc is established the formation for molten bath between welding wire 140 and workpiece 115 from workpiece 115 constantly.

In another exemplary embodiment, in the second determining step 360, the arc voltage between filler wire 140 and workpiece 115 is monitored and whether exceed threshold value (e.g., such as 10-20 volt to voltage, or more particularly, more than 15 volts) make and determining.Additionally or alternatively, threshold voltage can according to wire types, material transfer mechanism (such as, short arc or pulse) and/or the protective gas used.Such as, for steel filler wire, wherein short arc GMAW technology is used to set up arc voltage, and 15 volts can limit threshold voltage.Set up in the hot welding wire process of steel of electric arc at use GMAW-P, 18-25 volt can be suitable.The formation of the stabilised bath 116 on threshold voltage instruction workpiece 115.Such as, threshold voltage can have such value, and under this value, known electric arc can be formed.Once definite threshold voltage is exceeded, the retraction of welding wire is stopped and welding wire is again advanced by towards workpiece 115 in forward step 370a.Along with adding of welding wire, stable molten bath start formed and power supply 170 breaking arc and allow welding wire soak (dip) in molten bath 116.Meanwhile, in welding wire heating steps 370b, heating current is applied to welding wire 140 and is heated to by welding wire 140 or close to its fusion temperature.Under molten bath keeps step 370c, the stability in molten bath 116 keeps by laser beam 110 is applied to molten bath 116.Again, in other embodiments, laser beam can be opened with the different time.Along with the stable of molten bath 116 and be advanced in molten bath be in or close to the filler wire 140 of the fusion temperature of welding wire, starting method completes and any one that can such as be used in shown in U.S. Patent Publication No.2011/0297658 or U.S. Patent Publication No.2010/0176109 and in the hot welding wire process described of hot welding wire process 280/380 performs.

Therefore, in embodiment described above, the heat of initial arc is used to create initial molten bath and starts laser (or electric arc) hot welding wire process.Penetration heat welding wire process, minimizes and splashes and/or avoid the fusing of filler wire in molten bath to be also desirably.Thus the embodiment of the technique of this theme comprises the method stopping hot welding wire process, can (such as, between welding wire and workpiece, not have electric arc to be formed) in a stable manner to make welding wire and shift out from molten bath.Usually, stop each the providing in the embodiment of hot welding wire process keep molten bath and heat welding wire, depart from the contact with molten bath with the distal end portion fusing or " burnup (burn) " that make welding wire.

Shown in Fig. 4 is an embodiment of method of shutting down 400.Start with ongoing hot welding wire process, current-termination step 410 provides the heating current stopping or close from power supply unit to welding wire 170.Heating current can with artificial mode or alternatively in an automated way sensed and current control subsystem 195 close.In the particular of Fig. 4, once heating current is terminated, sending in rate reduction step 420, the welding wire to molten bath 116 is sent rate to and is lowered.In a specific embodiment, welding wire is sent rate to and can be stopped.When reducing heating currents and when sending both rates in step 410,420, in the maintenance step 430 of at least one embodiment in the stop process of this theme, molten bath is kept, and wherein laser beam 110 is applied to molten bath to keep its stability.

At the end of circulation, when light beam 110 is still applied in, the pulse step 440 of the method for this theme provides and multiple current impulse is applied to welding wire 140 to flash back or to remove welding wire 140 from molten bath.In the exemplary of method 400, sensing and current control subsystem control power supply unit 170 and current impulse are applied to filler wire.Current impulse has enough to be transferred to solder wire material in molten bath, and more particularly, enough removes the value of one section of welding wire from molten bath.Thus the distal end portion of welding wire enough " flashes back " and departs from molten bath by the current impulse of repetition.Exemplary provides current impulse to have the levels of current can not initiating electric arc between welding wire and workpiece 115.Such as, voltage and/or electric current can guarantee that electric current rests on electric arc and produces below horizontal impulse duration is monitored.For multiple electric current and pulse alternatively, single current pulse can be used, if single current pulse has suitable rise time, duration and welding wire burnup departed from the electric current in molten bath.

In an exemplary embodiment, current impulse is applied in until the distal end portion of welding wire 140 departs from molten bath, and removes fully from molten bath 116.Thus the method for shutting down 400 of this theme comprises in one embodiment, determining step 450 determines whether the distal end portion of welding wire 140 departs from molten bath 116.Such as, the voltage between the distal end portion of welding wire 140 and workpiece 115 can be monitored constantly during pulse step 440.Once the voltage monitored exceeds the value that instruction welding wire separates with molten bath, hot weld silk electric current can be terminated in end step 460.The termination of hot welding wire process can comprise in the laser instrument and/or power supply unit 170 of closing and current impulse being provided to welding wire 140 one or more.In other embodiments, technique can be terminated after the current impulse of predefined quantity or after the time of one section of predetermined volume is initiated in pulse.In yet another aspect, welding wire to be eliminated from molten bath by stopping pulse and laser instrument stays open until molten bath can be stablized and not by the impact of the last molten drop of welding wire.In yet another aspect, laser is declined by slope and slows down cooling by " hole (crater) " of recalling left by welding wire and solidification molten bath or space.

Another embodiment of the method for hot welding wire process 500 is stopped to be illustrated in Figure 5.In this method of shutting down, filler wire is sent to and to be stopped or alternatively welding wire is contracted from molten bath, and wherein heating current is still applied to welding wire 140 during retracting.To be formed for the electric arc between the distal end portion and workpiece of welding wire and monitored to the electric current of welding wire and/or the voltage between welding wire and workpiece.Heating current to welding wire was just terminated before the formation of electric arc, and hot welding wire process terminates.

More specifically, Fig. 5 illustrates ongoing hot welding wire process.In step 510a, the welding wire to molten bath is sent to and is stopped in artificial mode or by the automatic control of wire feeder 150.Alternatively, this technique can comprise retraction step 510b, and wherein wire feeder 150 is operated to filler wire 140 to retract from molten bath 116.In arbitrary step, heating current is kept.In some example embodiments, heating current is kept, but to be kept lower than the level of the heating current during hot welding wire process.Such as, the heating current recalled be recall before hot welding wire process 90% or following.In maintenance step 520, molten bath such as, is maintained at stable state by independent high strength energy source (e.g., laser beam 110).

The stopping sent to along with welding wire and/or welding wire 140 are from the retraction in molten bath 116, and the heating current to welding wire is monitored in monitoring step 530, and determining step 540 is performed to determine whether electric arc will be formed between the distal end portion of welding wire 140 and workpiece 115.Alternatively or in addition, monitoring step can comprise the voltage between monitoring welding wire 140 and workpiece 115.In a specific embodiment, determining step can be performed by the advance notice circuit of system 100.Such advance notice circuit can by determining to the assessment of the electric current monitored and/or voltage whether electric arc will be formed between workpiece/molten bath and the distal end portion of welding wire 140.Typically, in molten bath, there is the depression caused by the heat of laser.When welding wire forms electric arc, there is little interval.

Advance notice circuit is well-known in arc welding field, and can be implemented in system 100 and/or controller 195 and/or power supply unit 170.Such as, the exemplary of the advance notice circuit of system 100 can be formed in sensing and current controller 195, one or more to measure in the rate of change of in following content: the potential difference (dv/dt) between filler wire 140 and workpiece 115, by the electric current (di/dt) of filler wire 140 and workpiece 115, resistance (dr/dt) between filler wire 140 and workpiece 115, or the power (dp/dt) passing through filler wire 140 and workpiece 115.When rate of change exceedes the value or threshold value that limit in advance, disengaging will appear in sensing and current controller 195 prediction or deciphering from measurement.More specifically, when the distal end portion of welding wire 140 becomes height melting due to the cause heated, this distal end portion can start to bind round disconnected (pinch off) to workpiece 115 from welding wire 140.If disengaged completely between welding wire and workpiece, potential difference (that is, voltage levvl) can sensedly measure with current controller 195, and described potential difference is obviously greater than zero volt.This potential difference may cause forming electric arc between the new distal end portion and workpiece 115 of welding wire 140.Thus the voltage change ratio between welding wire and workpiece can be monitored near known threshold value for it, at this threshold value place, it is known for forming electric arc.Alternatively, the resistance level in levels of current, welding wire and/or the power level to welding wire can be monitored, to determine the moment before electric arc formation.Such as, separately whether maybe will occur if point open voltage and/or levels of current can be used to determine and when this level is reached or is exceeded, determine that welding wire 140 separates with molten bath 116.Alternatively, this level can be electric arc generation level (voltage, electric current, power etc.), and described level is to detect that the imminent electric arc of separate detection creates.

Determine once make, electric arc will be formed between welding wire 140 and workpiece 115 and/or welding wire 140 separates with molten bath 116, and the heating current to welding wire is terminated in current-termination step 550.Once the voltage monitored exceedes the value that instruction welding wire separates with molten bath, hot welding wire process can stop in end step 560.Because stop process 500 proceeds to such point, before the electric arc of described point only between welding wire 140-and workpiece 115 is formed, when heating current is terminated, the distal end portion of welding wire is arranged on outside molten bath 116.Hot welding wire process is terminated completely in step 560, and wherein Laser Power Devices supply 130 is closed.

Fig. 6 is another embodiment of method of shutting down 600.Start with ongoing hot welding wire process, stop action step 610 to provide to stop the relative movement between workpiece 115, laser instrument 120 and/or welding wire 140.In the particular of Fig. 6, once relative movement is terminated, the welding wire to molten bath 116 is sent rate to and is reduced/stop in the rate of sending in step 620 and be lowered and/or be stopped.When the relative motion between step 610,620 reduction/halt system parts and when sending both rates to, be kept in the maintenance step 630 of at least one embodiment of molten bath 116 in the stop process of this theme, wherein laser beam 110 is applied to molten bath to keep its stability.

At the end of circulation, when light beam 110 is still applied in, the pulse step 640 of the method for this theme provides and heating current is applied to welding wire 140.In the exemplary of method 600, RACS 195 controls power supply unit 170 and current impulse is applied to filler wire 140.Simultaneously or in retraction step 650, be retracted into such point from molten bath 116 subsequently, at described point, welding wire disconnects from molten bath welding wire.In a specific embodiment of method 600, advance notice circuit is used, and can be heated (step 640), be contracted (step 650) and disconnect at known point to make welding wire.Along with the disconnection of welding wire 140, the extension of welding wire can keep extending from molten bath 116.Laser instrument 120 and light beam 110 are from this extension of burnup, molten bath 116.In termination step 670, the termination of hot welding wire process can comprise close in laser instrument and/or power supply unit 170 one or more.

As previously stated, embodiment of the present invention can be utilized together with GMAW/MIG system instead of laser instrument.Equally, GTAW type system can be used to provide high strength heat as described herein.When utilizing GMAW/MIG technique, startup and stop process are usually as described herein.In some example embodiments, GMAW/MIG/GTAW is activated, and as described above, is initiated before the initiation of the startup electric arc of electric arc in hot welding wire process.In such exemplary, GMAW/MIG/GTAW electric arc is activated and electric arc is pushed into molten bath is formed.Subsequently, hot weld silk startup technique is initiated.In other embodiments, the hot welding wire process that not long ago starts of initiating at GMAW/MIG/GTAW electric arc may be useful.But postponing should be not oversize, and to make once GMAW/MIG/GTAW electric arc creates molten bath, hot welding wire process is allowed to start in the suitable time.

Explanation above Fig. 1 and system 100 provides the general part description to such system, and described system is used for the startup of this theme and/or method of shutting down to apply to hot welding wire process.The alternatively or additionally embodiment of the system 100 of hot welding wire process being startup for performing this theme and/or method of shutting down and being associated described in U.S. Patent Application Publication No.2011/0297658, U.S. Patent Application Publication No.2010/0176109, each full content in described U.S. Patent Application Publication No.2011/0297658 and U.S. Patent Application Publication No.2010/0176109 is merged in by reference.

Although describe the present invention with reference to some embodiment, it will be understood by those skilled in the art that and can carry out various change and equivalent can be replaced, and do not depart from scope of the present invention.In addition, many amendments can be carried out and be applicable to instruction of the present invention to make particular condition or material, and not depart from its scope.Therefore, be not intended to limit the invention to disclosed particular, the present invention will comprise all embodiments fallen in the scope of appended claims.

ref. No.

100 system 330 determining steps

110 laser beams 340 are retracted step

115 workpiece 350 forming step

116 molten bath 360 determining steps

117 molten bath 370a forward steps

120 laser aid 370b heating stepses

125 direction 370c keep step

130 power supply unit 380 techniques

140 filler wire 400 method of shutting down

150 wire feeders 410 stop step

160 contact tubes 420 reduce step

170 power supply units 430 keep step

180 controller 440 pulse step

190 robot 450 determining steps

195 RACS 460 end step

200 starting method 500 stop process

210 step 510b retraction steps

220 steps 520 keep step

230 determining step 530 monitoring steps

240 retraction step 540 determining steps

250 forming step 550 stop step

260 determining step 560 end step

270 step 600 method of shutting down

270a forward step 610 stops action step

270b heating steps 630 keeps step

270c keep step 620 reduce/stop step

280 technique 640 (pulse) steps

300 starting methods 650 are retracted step

310 initial step 670 stop step

320 forward steps

Claims

1., for starting a method for hot welding wire process, described method comprises:

Electric arc is set up, to form molten bath in described workpiece between filler wire and workpiece;

Utilize the high strength energy source being different from described electric arc that heat is added to described molten bath;

After setting up described electric arc, described welding wire is advanced in described molten bath; And

Heating current is applied to described welding wire, to stop described electric arc and by described wire melting in described molten bath.

2. the method for claim 1, wherein said high strength energy source is laser instrument.

3. method as claimed in claim 1 or 2, is included in the step sensing the contact between described welding wire and described workpiece before setting up described electric arc further.

4. the method as described in any one in claims 1 to 3, the step wherein sensing described contact comprises and advances described welding wire towards described workpiece, sensing signal is applied to described welding wire to determine the contact between described welding wire and described workpiece.

5. the method as described in any one in Claims 1-4, the step wherein setting up described electric arc comprises to retract described welding wire and electric arc generation current is applied to described welding wire during retracting to set up described electric arc from described workpiece, or

Wherein when described filler wire and described workpiece formed contact time, after the described sensing signal in described filler wire drops to below threshold value, described electric arc is established.

6. the method as described in any one in claim 1 to 5, the step wherein setting up described electric arc comprises the gap applying electric arc generation current and provide between described workpiece and described welding wire, wherein said electric arc generation current has enough energy, has to make described electric arc the enough intensity forming described molten bath in described workpiece.

7. the method as described in any one in claim 1 to 6, comprises the step of the described hot welding wire process of the stopping comprising following content further:

Stop the described heating current to described welding wire;

Reduce and send rate in the described described molten bath be advanced to by welding wire in described workpiece;

Described high strength energy source is utilized to keep described molten bath;

Multiple current impulse is applied to described welding wire, to make the described distal end portion of described welding wire be moved out of from described molten bath, and/or

Comprise the step of the described hot welding wire process of the stopping comprising following content further:

Stop the propelling to the described welding wire in the described molten bath in described workpiece;

To retract from described molten bath described welding wire;

Sense the formation of the electric arc between described welding wire and described workpiece; And

The described heating current of described welding wire was terminated to before described electric arc is formed, and/or

Stop the propelling to the described welding wire in described molten bath;

Retract from described molten bath described welding wire, at least some in wherein said heating current is applied to described welding wire, to make described welding wire disconnect and separate with described molten bath, and in described molten bath, leaves a welding wire extension;

Apply from the energy of described high strength energy source described extension is melted in described molten bath.

8. the method as described in any one in claim 1 to 7, the step wherein setting up described electric arc between described welding wire and described workpiece comprises and uses one in short arc transfer welding or pulse welding technique electric current is applied to described welding wire.

9. the method as described in any one in claim 1 to 8, comprises the step utilizing molten bath described in described arc stability further.

10. the method as described in any one in claim 1 to 9, comprises the described electric arc of monitoring further to determine the step of the stability in described molten bath.

11. 1 kinds of hot weld silk systems, described hot weld silk system comprises:

Feeder (150), described feeder (150) is for the distal end portion relative to workpiece (115) propelling and retraction filler wire (140);

Power supply unit (170), described power supply unit (170) is for being applied to described welding wire by sensing signal, electric arc generation current and heating current;

Controller (180), described controller (180) is coupled to described feeder (150) and described power supply unit (170), for initiating hot welding wire process, described controller (180) by the step that comprises following content described welding wire (140) is set relative to described workpiece (115) and regulate described sensing signal, described electric arc to produce in signal and described heating current each:

Advance the described distal end portion of described welding wire (140) towards described workpiece (115) and regulate described sensing signal, to determine when described distal end portion contacts with described workpiece (115);

From described workpiece (115) retract described welding wire (140) described distal end portion and regulate described electric arc generation current, to form electric arc to form molten bath (116,117) between described distal end portion and described workpiece (115); And

Described welding wire (140) to be advanced in described molten bath (116,117) and to regulate described heating current, to be melted to by described welding wire (140) in described molten bath (116,117); And

High strength energy source, heat is provided to described molten bath (116,117) by described high strength energy source.

12. hot weld silk systems (100) as claimed in claim 11, wherein said controller (180) comprises advance notice circuit, and described advance notice circuit is used for determining the moment before the electric arc formation between described welding wire (140) and described workpiece (115).

13. hot weld silk systems (100) as described in claim 11 or 12, wherein said high strength energy source is laser instrument (120,130), described controller (180) is operably connected to described laser instrument (120/130), for coordinating described laser instrument (120,130) with the operation of described power supply unit (130,170), or

Wherein said high strength energy source is voltaic arc generating device, and described controller (180) is operably connected to described voltaic arc generating device, produces the operation with described power supply unit (170) for coordinating described electric arc.

14. 1 kinds of hot weld silk systems (100), described hot weld silk system (100) comprising:

Feeder (150), described feeder (150) advances and the distal end portion of retraction filler wire (140) for the molten bath (116,117) relative to workpiece (115);

Power supply unit (170), described power supply unit (170) is for being applied to described welding wire (115) by electric current;

High strength energy source, heat is provided to described molten bath (116,117) by described high strength energy source; And

Controller (160), described controller (160) is coupled to described feeder (150) and described power supply unit (170), for stopping hot welding wire process, described controller (180) arranges described welding wire (140) relative to described workpiece (115) by comprising the step of at least one in following content and regulates described electric current:

I () stops to described molten bath (116,117) propelling of the described welding wire (140) in and will to the described current impulse of described welding wire (140), so that welding wire described in burnup (140) departs from described molten bath (116,117);

(ii) to retract described welding wire (140) and regulate described electric current, to prevent the electric arc between described welding wire (140) and described workpiece (115) from described molten bath (116,117); And

(iii) from described molten bath (116,117) to retract described welding wire (140) and regulate described electric current, to make described welding wire (140) from described molten bath (116,117) disconnect and there is no the electric arc between described welding wire (140) and described workpiece (115), so that the described heat from described high-intensity source can melt a part for the described welding wire (140) extended from described molten bath (116,117).

15. 1 kinds stop the method for hot welding wire process, and described hot welding wire process has the heating current be melted to by filler wire in the molten bath of workpiece, and described method of shutting down comprises:

Reduce described welding wire to sending rate in described molten bath;

High strength energy source is utilized to keep described molten bath; And

At least one in following content:

I () stops the described heating current to described welding wire and multiple current impulse is applied to described welding wire, shift out from described molten bath to make the described distal end portion of described welding wire;

(ii) to retract from described molten bath described welding wire, sense the formation of the electric arc between described welding wire and described workpiece, and before described electric arc is formed, is terminated to the described heating current of described welding wire; And

(iii) retract from described molten bath described welding wire, at least some in wherein said heating current is applied to described welding wire, disconnects to make described welding wire and separates with described molten bath, to leave a welding wire extension in described molten bath; And the energy from described high strength energy source is applied to described welding wire extension, to be melted in described molten bath described extension.