Method and apparatus for stabilizing transitions between different types of welding process phases of a welding process

Abstract

A welding device (1) for welding a workpiece (W) in a welding process (SP), comprising different types of welding process phases (SPP) in which the workpiece (W) is respectively welded by means of a welding arc (LB) which extends between a welding wire electrode (SDE) of the welding device (1) and the workpiece (W), wherein for a welding process phase (SPP) an arc parameter LBP of the welding arc (LB), in particular its arc length LBL, is settable, wherein the welding device (1) has a controller (4) which effects a change ΔLBP of the arc parameter of the welding arc (LB) corresponding to the arc parameter LBP set for a welding process phase (SPP) during a welding process transition between different types of welding process phases (SPP) of the welding process (SP) and simultaneously automatically adapts at least one transition welding parameter of a welding power source (2) of the welding device (1) to the occurring arc parameter change ΔLBP in order to stabilize said welding process transition within the welding process (SP)

Description

TECHNICAL FIELD

[0001] The present invention relates to a method and a device for stabilizing the transition between different types of welding process phases, especially in the method of arc welding. BACKGROUND

[0002] In arc welding, a welding arc is burned between a workpiece and a welding wire electrode. Here, the welding wire electrode can be melted and used as a welding filler material. In gas shielded welding, the arc is shielded from the atmosphere by a shielding gas, for example carbon dioxide or argon. The continuously melting welding wire electrode is gradually drawn from a welding wire coil. In this case, the welding wire electrode extends in a hose through which the shielding gas is also supplied. In welding with metal inert gas (MIG), an inert shielding gas is used. In contrast, in welding with metal active gas (MAG), a reactive gas such as carbon dioxide is used as a shielding gas.

[0003] Different welding parameters, especially the arc length, will influence the result of the welding process. Short arc welding is used for thin metal sheets or difficult-to-weld locations. In this case, less cracking between the materials and a smoother transition occur. In contrast, long arc welding is mainly used for thicker metal sheets.

[0004] In metal gas shielded welding (MSG), i.e. in alternative MIG or MAG welding, a consumable welding wire electrode is used, which can be fed via an electric motor at a variable welding wire advance speed. The welding wire electrode will be melted in different ways by the welding arc depending on the set welding parameters.

[0005] In welding with the aid of a pulsed arc, an elevated pulse current is regularly superimposed on a background current. In the background current phase, the arc or welding arc is burned at low power, in which the welding filler material is melted and the weld pool remains liquid. In the pulse phase, a droplet is formed, which is released by an increased magnetic constriction (pinch effect). The set values can be chosen such that one droplet is produced and released during each current pulse, depending on the welding wire diameter of the welding wire electrode and the material of the welding wire electrode. Depending on the different set welding voltages and set welding currents and set arc lengths, one can distinguish different arc types as is generally known from the prior art. The different arc types include short arc, long arc, pulsed arc and so-called spray arc and rotating arc. At this point, the wire feeder can be advanced both in the direction of the workpiece and in the opposite direction.

[0006] In many application cases, a switching between different welding process phases is required. The different welding process phases have different welding parameters and / or arc types. In many welding processes, a periodic switching between different welding process phases occurs. However, in conventional welding processes, it is difficult to stabilize the process transition from one welding process phase of the welding process to the next welding process phase of the welding process. This instability in the switching between different welding process phases has a negative influence on the welding result, especially in terms of the appearance of the formed weld seam or the occurring welding spatters. SUMMARY

[0007] It is therefore the task of the present invention to provide a method and a device for stabilizing the transition between different types of welding process phases of a welding process.

[0008] According to the invention, this task is solved by a method having the features specified in claim 1.

[0009] The invention therefore provides a method for stabilizing the transition between different types of welding process phases of a welding process, wherein in the at least said welding process phases, a workpiece is respectively welded by means of a welding arc extending between a welding wire electrode and the workpiece, and the welding arc has an arc length parameter which is settable for the at least one welding process phase, wherein for the transition between different types of welding process phases succeeding one another, if the set arc length parameter of the welding arc changes, at least one transition welding parameter is automatically adapted in parallel to the occurring arc length parameter change in order to stabilize the welding process transition.

[0010] In one possible embodiment of the method according to the invention for stabilizing the transition between different types of welding process phases of a welding process, the transition welding parameter comprises the wire advance speed of the self-consuming welding wire electrode.

[0011] In another possible embodiment of the method according to the invention for stabilizing the transition between different types of welding process phases of a welding process, the transition welding parameter comprises the amplitude and / or polarity of the average welding current flowing through the welding wire electrode.

[0012] In another possible embodiment of the method according to the invention for stabilizing the transition between different types of welding process phases of a welding process, the transition welding parameter comprises the amplitude and / or polarity of the welding voltage applied between the welding wire electrode and the workpiece.

[0013] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, the transition welding parameters comprise the number and / or frequency of pulses of the welding current flowing through the welding wire electrode.

[0014] In another possible preferred embodiment of the method according to the present application, the arc parameter comprises the arc length of the welding arc.

[0015] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, the welding wire advance speed and / or acceleration of the consumable welding wire electrode is automatically increased or decreased as a transition welding parameter with increasing or decreasing of the implemented arc length variation to stabilize the welding process phase transition.

[0016] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, the amplitude and / or duration of the welding current and / or the amplitude of the welding voltage is automatically decreased or increased with increasing or decreasing of the implemented arc length variation.

[0017] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, the number and / or frequency of pulses of the welding current is automatically decreased or increased with increasing or decreasing of the implemented arc length variation.

[0018] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, for different combinations of pairs of different types of welding process phases of the welding process succeeding each other, respectively for different implemented arc length variations, the associated configurable welding parameter sets of transition welding parameters are stored in a table form in a parameter data storage.

[0019] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, depending on the occurring arc parameter variation and the combination of two different types of welding process phases succeeding each other, the associated welding parameter sets are read out from the parameter data storage and the respective transition welding parameters are adapted to stabilize the welding process phase transition between the two welding process phases.

[0020] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, different transition function profiles of transition welding parameters are provided for different combinations of pairs of different types of welding process phases of the welding process succeeding each other.

[0021] In another possible embodiment of the method for stabilizing the transition between different types of welding process phases of a welding process according to the present application, parameter values for different transition welding parameters are calculated and the transition welding parameters are adapted during the welding process phase transition according to the occurring arc parameter changes and the associated stored transition function characteristic curve in order to stabilize the welding process phase transition in accordance with the calculated parameter values.

[0022] In another possible embodiment of the method according to the present application, the welding process phases include a short arc welding phase, a long arc welding phase, a pulsed arc welding phase, a short arc welding phase with forward or backward movement, a spray arc welding phase, a welding phase with a rotating welding arc, and / or a transition arc welding phase.

[0023] According to another aspect, the present application provides a welding device having the features given in claim 12.

[0024] The present application thus provides a welding device for welding a workpiece in a welding process, which welding process comprises different types of welding process phases, in which the workpiece is respectively welded by means of a welding arc, which welding arc extends between a welding wire electrode of the welding device and the workpiece, wherein an arc parameter of the welding arc, in particular its arc length, can be set for the welding process phases, wherein the welding device has a controller, which effects a change of the arc parameter of the welding arc in accordance with the arc parameter set for the welding process phase during the transition between the different types of welding process phases of the welding process and simultaneously automatically adapts at least one transition welding parameter of a welding power source of the welding device in accordance with the occurring arc parameter change in order to stabilize the welding process phase transition within the welding process.

[0025] In one possible embodiment of the welding device according to the present application, for the different welding process phases of the welding process, the associated arc parameter target values for the arc parameters to be used are respectively pre-set, which arc parameter target values can be respectively manually adjusted or re-adjusted by a user within a pre-given range by means of a setting element.

[0026] The arc parameter target values, in particular the arc parameter target values for the arc length, can also be pre-given via an interface of an external superior controller or robot controller.

[0027] In another possible embodiment of the welding device according to the application, for different combinations of pairs of different types of welding process phases following each other for the welding process, respectively for different implemented arc length variations, the associated configurable welding parameter sets for the transition welding parameters are stored in a table in the parameter data memory of the welding device.

[0028] In another possible embodiment of the welding device according to the application, depending on the occurring arc parameter variation and the combination of two different types of welding process phases following each other, the associated welding parameter set is read out from the parameter data memory of the welding device and the corresponding transition welding parameters are automatically adapted by the controller of the welding device to stabilize the welding process phase transition between the two welding process phases.

[0029] In another possible embodiment of the welding device according to the application, different transition function characteristic curves for the transition welding parameters are provided for different combinations of pairs of different types of welding process phases following each other for the welding process.

[0030] In another possible embodiment of the welding device according to the application, depending on the occurring arc parameter variation and the associated stored transition function characteristic curve, parameter values are calculated for different transition welding parameters during the welding process phase transition by a calculation unit of the controller of the welding device and the transition welding parameters are automatically adapted by the controller of the welding device to stabilize the welding process phase transition.

[0031] In another possible embodiment of the welding device according to the application, the welding device has an interface for loading the welding parameter sets for the transition welding parameters and / or for loading the transition function characteristic curves from a database.

[0032] Possible embodiments of the method according to the application and the device according to the application for stabilizing the transition between different types of welding process phases of a welding process are explained in more detail hereinafter with reference to the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A schematic circuit diagram is shown for explaining the mode of operation of the welding device according to the application;

[0034] Figure 2 A schematic diagram is shown for explaining the mode of operation of the method according to the application and the device according to the application for stabilizing the transition between different types of welding process phases of a welding process;

[0035] Figure 3A , 3BFig. 3C exemplarily illustrates a welding process with periodically alternating welding process phases to elucidate the working manner of the method according to the application and of the device according to the application for stabilizing the transition between different types of welding process phases of a welding process. DETAILED DESCRIPTION

[0036] As one can see from Figure 1 Fig. 1, the welding device 1 according to one aspect of the application has a welding power source 2 which supplies a welding current and a welding voltage to a welding torch 3 of the welding device 1. The welding torch 3 can have a shielding gas nozzle. A welding wire electrode SDE can be fed out of a contact tube of the welding torch 3 to weld a workpiece W. As Figure 1 Fig. 2 shows, a welding arc LB is generated between the welding wire electrode SDE and the workpiece W. The welding device 1 is used to weld the workpiece W in a welding process SP which can comprise different types of welding process phases SPP in which the workpiece W is respectively welded by means of the welding arc LB. The welding arc LB can be set with arc parameters LBP, in particular with an arc length LBL, for the different welding process phases SPP. The welding device 1 has a controller 4 which effects a change of the arc length parameter LBLP of the welding arc SLB in correspondence with the arc parameters LBP set for the welding process phases SPP at the transition between the different types of welding process phases SPP of the welding process SP. Here, the controller 4 simultaneously adapts at least one transition welding parameter to stabilize the welding process transition within the welding process SP The welding power source 4 can have an interface 6. Through the interface 6 and a network 7, the local controller 4 of the welding power source 2 can receive control commands and / or theoretical parameter settings from an external superior controller 8, for example from an automation device.

[0037] Figure 2 The welding process SP is schematically shown which consists of a series of distinguished or different welding process phases SPP. The different welding process phases SPP can exemplarily comprise a short arc welding phase, a short arc welding phase with a reversed welding wire motion (CMT), a long arc welding phase, a pulsed arc welding phase, a spray arc welding phase and / or a welding phase with a rotating arc. The sequence of the different types of welding process phases SPP can differ depending on the welding process SP. As Figure 3AAs is shown exemplarily in the middle, for example two different types of welding process phases SPP, for example welding process phase SPP-A and welding process phase SPP-B, can be cyclically alternated. For example, a pulsed arc welding phase can be cyclically alternated with a short arc welding phase. Obviously, three or more welding process phases SPP can also be alternated with one another (not shown).

[0038] Figure 2 Different welding process transitions between welding process phases SPP of a welding process are also shown schematically In the welding process transition The transition welding parameters are adapted or adjusted The duration of the welding process transition and the combination of the appropriate transition welding parameters depend on the two welding process phases SPP involved between which the welding process transition is made

[0039] For different welding process phases SPP of a welding process SP, the associated arc parameter target values, in particular the arc length target values, to be used can be preset for the arc parameters LBP, respectively. These presets can be manually adjusted or re-adjusted or corrected by the user in a predefined range by means of setting elements at the welding power source 2. Alternatively, these presets can be implemented via an interface by an external controller 8.

[0040] For different combinations of pairs of different types of welding process phases SPP successive to one another of a welding process SP, the associated configurable welding parameter sets of the transition welding parameters are stored in tabular form in the parameter data memory 5 of the welding device 1. In one possible embodiment, the transition welding parameters are loaded by means of an interface from a database into the local data memory 5 of the welding power source 2. From the welding process parameter data memory 5 of the welding device 1, the associated welding parameter sets are read out depending on the arc length parameter change ΔLBLP occurring and the combination of the two different types of welding process phases SPP successive to one another and the corresponding transition welding parameters are automatically adapted or adjusted by the controller 4 of the welding device 1 in order to stabilize the involved welding process phase transition

[0041] In another possible embodiment of the welding device 1 according to the invention, different transition welding parameters of the transition function characteristic curve. Depending on the occurring arc length parameter change ΔLBLP and the associated stored transition function characteristic curve, the welding process phase transition during the welding process phase transition is stabilized by the control unit of the welding device 1 calculates the parameter values and automatically adapts the transition welding parameters to stabilize the welding process phase transition Preferably, the welding device 1 has an interface for loading the transition welding parameters of the welding parameter set and / or for loading the transition function characteristic curve from a database. The database can be connected to the interface of the welding device 1, for example via a data network.

[0042] The different transition welding parameters can be automatically adapted by means of the method according to the invention and the device according to the invention depending on the occurring arc parameter change, in particular the arc length change, to stabilize the welding process phase transition between two welding process phases SPP of the same welding process SP, which follow one another In one possible embodiment, the transition welding parameters include the wire electrode SDE wire advance speed V D and / or the wire electrode SDE wire advance acceleration a D In addition, the transition welding parameters can include the amplitude and / or polarity of the average welding current I flowing through the wire electrode SDE. In another possible embodiment, the transition welding parameters include the amplitude and / or polarity of the welding voltage U applied between the wire electrode SDE and the workpiece W. In another possible embodiment of the method according to the invention and the device according to the invention, the transition welding parameters include the number and / or frequency of the pulses of the welding current I flowing through the wire electrode SDE.

[0043] By means of an arc length change ΔLBL or arc length parameter change ΔLBLP implemented in the positive direction (+5), the wire electrode SDE wire advance speed V as a transition welding parameter D is automatically increased to stabilize the welding process phase transition between two welding process phases SPP of the welding process SP Conversely, in the case of an arc length change ΔLBL implemented in the negative direction, the wire electrode SDE wire advance speed V as a transition welding parameter D is automatically reduced to stabilize the welding process phase transition The arc length variation ΔLBL can be implemented, for example, in correction values. At this point, a correction value of 0 means that the arc length LBL has not changed. In the case of a variation in the positive direction, the arc length LBL is correspondingly increased and in the negative direction it is correspondingly decreased. This will be described below exemplarily with the correction values -5, 0 and +5.

[0044] In another possible embodiment of the method according to the application and of the device according to the application, the amplitude and / or the duration of the welding current I and / or the amplitude and / or the duration of the welding voltage U are automatically reduced in the case of an increasing implementation of an (positive) arc length variation ΔLBL. Conversely, the amplitude and / or the duration of the welding current I and / or the amplitude and / or the duration of the welding voltage U are automatically increased in the case of a decreasing implementation of a (negative) arc length variation ΔLBL.

[0045] Furthermore, in one possible embodiment, the number and / or the frequency of the pulses of the welding current I are automatically reduced with increasing implementation of the arc length variation ΔLBL. Conversely, the number and / or the frequency of the pulses of the welding current I are automatically increased in the case of a decreasing implementation of the arc length variation ΔLBL.

[0046] Figure 2 and Fig. 3 show an exemplary embodiment of a welding process SP with two cyclically alternating welding process phases SPP-A, SPP-B with different welding parameters, in particular welding voltage U, welding current I and wire advance speed V D . Transition welding parameters The arc length LBL can be adapted to the welding process phases A, B. Instabilities can occur in the case of a manual or remote control of the variation or readjustment or correction of the arc length setting value, which can be avoided or remedied by the method according to the application. That is to say, this means that the duration of the welding process transition is essentially unchanged, in particular not prolonged, by the variation of the arc length LBL.

[0047] In parallel to the arc length correction caused by the manual readjustment, the transition welding parameters are corrected by means of the method according to the application, in particular the wire advance speed V D , the welding current I and the time profile thereof.

[0048] This is to be understood as meaning that the welding process transition In this case, the wire advance speed vd is temporarily increased in order to initiate the short circuit KS more quickly, and the wire electrode SDE is subsequently moved back. Alternatively, the wire advance speed vd can be varied in a stepwise manner. Here, the values of the parameters are essentially independent of the values in the welding process phase SPP, so that the values of the parameters can be freely selected. Likewise, the time curve can be different (not shown) during the different welding process transitions In general, this adjustment or adaptation in the welding process transition is made in accordance with the welding process phase SPP, since each welding process phase SPP has a different heat input into the workpiece W.

[0049] In general, the welding process transition is triggered, for example, at the end of a pulse or at a short circuit KS. These events can thus serve as a start / end of the welding process transition The duration of the welding process transition can also be defined by a predefined number of durations / cycles. However, the adaptation of the transition welding parameters can also begin before the welding process transition begins. If, for example, a very high wire advance speed vd is required in the welding process SP and a very low wire advance speed vd is required in the subsequent welding process SP, then the wire advance speed vd has already been reduced in the last cycle of the current SP. In this way, the change in this welding process transition is not so abrupt, and the welding process transition is achieved in a more stable manner.

[0050] For example, in a welding process SP, a transition or switching can be implemented (either with a continuous wire advance speed vd in the forward direction or with a periodic forward / backward movement of the wire advance speed vd) between a first welding process phase SPP-A (pulsed arc welding) and a second welding process phase SPP-B (for example short arc welding). In the first welding process phase SPP-A (pulsed arc welding), the heat input is significantly higher. As a result, the arc length LBL is automatically longer than in the second welding process phase SPP-B (short arc). In order to switch from the first welding process phase A (pulsed arc welding) to the second welding process phase B (short arc phase), the difference in the arc length ΔLBL is automatically overcome by means of the method according to the application. When the arc length LBL of the welding process phase SPP-A increases when the method according to the application is not used, the switching from the welding process phase SPP-A to the welding process phase SPP-B will take longer, so that the desired welding result can no longer be achieved. With the aid of the method according to the application, this case is counteracted, so that the desired welding result is achieved. In one possible embodiment, for example, the wire advance speed V DTransition of welding process during the switch from SPP-A to SPP-B The arc length variation ΔLBL increases in parallel. This allows the distance, i.e., the arc length distance, to be overcome more quickly. The method according to the invention significantly improves the quality of welding results in welding processes SP, which include different types of welding process stages SPP.

[0051] exist Figures 3A to 3C The welding process transition is illustrated in detail and by example. exist Figure 3B In the middle, the arc length LBL decreases by (-5), in Figure 3C The value increases by 5. Correspondingly, this is in line with... Figure 3A This is achieved by comparing (+ / -0). Importantly, this is done by adjusting the transition welding parameters. Selection or adjustment to maintain the transition of the welding process The duration remains basically unchanged.

[0052] Transition welding parameters The adjustment is carried out in such a way that the transition during the welding process is... During the duration, the target value remains essentially constant. In this case, this is essentially achieved by adjusting the wire feed speed V. D To achieve this.

[0053] Figure Labels

[0054] 1 Welding equipment

[0055] 2 Welding power source

[0056] 3 Welding torch

[0057] 4. Parameter storage

[0058] 5 Controllers

[0059] 6 Interfaces

[0060] 7. Network

[0061] 8 controllers

[0062] SP welding process

[0063] SPP welding process stage

[0064] Welding process transition

[0065] SDE welding wire electrode

[0066] W workpiece

[0067] LB welding arc

Claims

1. A welding process transition between different types of welding process stages (SPP-A, SPP-B) for a stable welding process (SP). The method, in which, The welding process stages (SPP-A, SPP-B) have different welding parameters. In this process, at least in the welding process stage (SPP), the workpiece (W) is welded by means of a welding arc (SLB) extending between the welding wire electrode (SDE) and the workpiece (W), and the welding arc (SLB) has an arc length parameter LBLP that can be set for the at least one welding process stage (SPP), wherein the welding process transitions between different types of welding process stages (SPP-A, SPP-B) that are successive to each other. During this process, if the set arc length parameter LBLP of the welding arc (SLB) changes, at least one transition welding parameter is automatically adapted in parallel according to the occurrence of the arc length parameter change ΔLBLP. To stabilize the transition of the welding process Among them, for the different welding process stages (SPP-A, SPP-B) of the welding process (SP), the arc length parameter LBLP to be used is pre-set with associated target values. The target values ​​of the arc parameters can be manually adjusted by the user with the aid of setting elements or by an external controller (8) within a pre-given range.

2. The method according to claim 1, in, The transition welding parameters include: -Wire feed speed V of consumable electrode (SDE) D and / or wire feed acceleration a D ; and / or -The average welding current I flowing through the welding wire electrode (SDE) s The amplitude and / or polarity, - The welding voltage U applied between the welding wire electrode (SDE) and the workpiece (W) s The amplitude and / or polarity, and / or - The welding current I flowing through the welding wire electrode (SDE) s The number and / or frequency of pulses.

3. The method according to claim 2, in, As the applied arc length variation ΔLBL increases or decreases, the wire feed speed V of the consumable electrode (SDE) increases. D As a transition welding parameter Automatically increase or decrease to stabilize the transition of the welding process.

4. The method according to claim 3, in, As the applied arc length change ΔLBL increases or decreases, the welding current I... s The amplitude and / or duration and / or the welding voltage U s The amplitude automatically decreases or increases.

5. The method according to any one of claims 3 or 4, in, As the applied arc length change ΔLBL increases or decreases, the welding current I... s The number and / or frequency of the pulses automatically decrease or increase.

6. The method according to any one of claims 1 to 5, in, For different combinations of a pair of successive welding process stages (SPP-A, SPP-B) of different types in the aforementioned welding process (SP), the transition welding parameters will be adjusted for different implementations of the arc length variation ΔLBP. The associated set of configurable welding parameters is stored in a table format in the parameter data storage (5).

7. The method according to claim 6, in, Based on the changes in arc parameters and the combination of two successive welding process stages of different types (SPP-A, SPP-B), the associated welding parameter set is read from the parameter data storage (5) and the corresponding transition welding parameters are adapted. To stabilize the welding process transition between the two welding process stages (SPP-A, SPP-B) 8. The method according to any one of claims 1 to 7, in, Different transition welding parameters are set for different combinations of a pair of successive welding process stages (SPP-A, SPP-B) of the aforementioned welding process (SP). The characteristic curve of the transition function.

9. The method according to claim 8, in, Based on the changes in arc parameters and the associated stored transition function characteristic curves, the transition during the welding process... Different transition welding parameters during the period Calculate parameter values ​​and adapt the transition welding parameters. The welding process transition is stabilized according to the calculated parameter values.

10. The method according to any one of claims 1 to 9, in, The welding process stages (SPP-A, SPP-B) include: During the short arc welding stage, During the long arc welding stage, During the pulsed arc welding stage, Short arc welding stages with forward or backward movement. During the arc spraying welding stage, Welding stage with rotating welding arc, and / or Transition arc welding stage.

11. A welding apparatus (1) for welding a workpiece (W) in a welding process (SP) comprising different types of welding process stages (SPP-A, SPP-B) with different welding parameters, wherein in each of the different types of welding process stages (SPP), the workpiece (W) is welded by means of a welding arc (LB), the welding arc extending between a welding wire electrode (SDE) of the welding apparatus (1) and the workpiece (W), wherein, For the welding process stages (SPP-A, SPP-B), the arc length parameter LBLP of the welding arc (LB) can be set. The welding apparatus (1) includes a controller (4) that transitions the welding process between different types of welding process stages (SPP-A, SPP-B) in the welding process (SP). During this period, the arc length parameter LBLP of the welding arc (LB) is changed by ΔLBLP according to the arc length parameter LBLP set for the welding process stage (SPP-A, SPP-B), and at the same time, at least one transition welding parameter of the welding power source (2) of the welding device (1) is automatically adapted according to the arc length parameter change ΔLBLP. To stabilize the welding process transition during the welding process (SP). Among them, for the different welding process stages (SPP-A, SPP-B) of the welding process (SP), the arc length parameter LBLP to be used is pre-set with associated target values. The target values ​​of the arc parameters can be manually adjusted by the user with the aid of setting elements or by an external controller (8) within a pre-given range.

12. The welding apparatus according to claim 11, in, For different combinations of a pair of successive welding process stages (SPP-A, SPP-B) of different types in the aforementioned welding process (SP), the transition welding parameters will be adjusted for different implementations of the arc length parameter variation ΔLBLP. The associated set of configurable welding parameters is stored in tabular form in the parameter data storage (5) of the welding apparatus (1). Specifically, based on the change in arc length parameter ΔLBLP and the combination of two successive welding process stages of different types (SPP-A, SPP-B), the associated welding parameter set is read from the parameter data storage (5) of the welding device (1), and the corresponding transition welding parameters are adapted by the controller (4) of the welding device (1). To stabilize the welding process transition between the two welding process stages (SPP-A, SPP-B) 13. The welding apparatus according to claim 12, in, For different combinations of two successive welding process stages (SPP-A, SPP-B) of the aforementioned welding process (SP), different transition welding parameters are set to generate transition function characteristic curves. Specifically, based on the arc length parameter change ΔLBLP and the associated stored transition function characteristic curve, the transition during the welding process is... During the process, the calculation unit of the controller (4) of the welding device (1) calculates different transition welding parameters. Calculate the parameter values ​​and adapt the transition welding parameters via the controller (4) of the welding device (1). To stabilize the transition of the welding process 14. The welding apparatus according to any one of claims 11 to 13, comprising a method for loading the transition welding parameters. The welding parameter set and / or the interface for loading transition function characteristic curves from the database.

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