CN112548408B - Detection method and detection system for necking in welding process and welding machine - Google Patents
Detection method and detection system for necking in welding process and welding machine Download PDFInfo
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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- G01R19/12—Measuring rate of change
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
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Abstract
The embodiment of the invention provides a detection method, a detection system and a welding machine for necking in a welding process, wherein the detection method comprises the following steps: determining a standard necking judgment threshold value under the standard dry elongation and the standard short circuit current slope; determining the compensation amount of a standard necking judgment threshold value of dry elongation change; determining the compensation quantity of a standard necking judgment threshold value of the slope change of the short-circuit current; determining a necking judgment threshold according to the sum of the standard necking judgment threshold, the compensation quantity of the standard necking judgment threshold for the change of the dry elongation and the compensation quantity of the standard necking judgment threshold for the change of the short-circuit current slope; and detecting whether necking is generated or not according to the necking judgment threshold value. The necking detection method in the welding process can accurately detect necking generation and reduce welding spatter.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a method and a system for detecting necking in a welding process and a welding machine.
Background
In the short-circuit welding process, in order to reduce welding spatter, precise waveform control needs to be carried out when a welding wire and a base metal are in short circuit, at the moment, a molten drop transition state needs to be monitored, the monitoring content mainly includes necking in the molten drop transition process (a liquid small bridge can be thinned in an accelerated mode before blasting), and a welding machine generally detects the change rate of a feedback voltage signal as a sign of necking.
When the liquid bridge is constricted, the welding machine can control the current to rapidly drop, the dropping speed is usually hundreds of amperes per millisecond, the current and the voltage are maintained at a lower level to wait for arc ignition, if the electric arc is ignited in a very low energy state, the explosive force of the liquid bridge is very small, the splashing can be greatly reduced, and then the current is rapidly increased, so that the energy of the electric arc is ensured.
Therefore, accurate detection of the occurrence of necking is a key to reducing spatter.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a necking detection method, a necking detection system and a welding machine in a welding process, which can accurately detect necking generation and reduce welding spatter.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to an aspect of the present disclosure, there is provided a detection method of necking in a welding process, the detection method including:
determining a standard necking judgment threshold value under the standard dry elongation and the standard short circuit current slope;
determining the compensation amount of a standard necking judgment threshold value of dry elongation change;
determining the compensation quantity of a standard necking judgment threshold value of the slope change of the short-circuit current;
determining a necking judgment threshold according to the sum of the standard necking judgment threshold, the compensation quantity of the standard necking judgment threshold for the change of the dry elongation and the compensation quantity of the standard necking judgment threshold for the change of the short-circuit current slope;
and detecting whether necking is generated or not according to the necking judgment threshold value.
In an exemplary embodiment of the present disclosure, detecting whether or not necking is generated based on the necking determination threshold includes:
when the voltage change rate is larger than the necking judgment threshold value, detecting that necking is generated;
and when the voltage change rate is smaller than the necking judgment threshold, detecting that no necking is generated.
In an exemplary embodiment of the present disclosure, the compensation amount of the standard neck determination threshold for dry elongation variation is:
dv1＝(1+K 1 ×L 1 /L 0 )×dv0
wherein dv1 is the compensation of the standard necking decision threshold, K 1 Compensating the coefficient for changes in dry elongation, L 1 For actual dry elongation, L 0 Dv0 is the standard neck determination threshold for standard dry elongation.
In an exemplary embodiment of the disclosure, the compensation amount of the standard necking determination threshold for the slope change of the short-circuit current is:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein dv2 is a compensation amount of a standard necking determination threshold for a change in slope of the short circuit current, K 2 Compensating coefficients for changes in the slope of the dry short circuit current, DI/DT 1 For actual short-circuit current slope, DI/DT 0 Dv0 is the standard neck determination threshold for the short circuit current slope.
In an exemplary embodiment of the present disclosure, the necking determination threshold is:
dv＝dv0+dv1+dv2
wherein dv is a necking determination threshold.
According to yet another aspect of the present disclosure, there is provided a detection system for neck in welding process, the detection system comprising:
a standard neck determination threshold determination module configured to determine a standard dry elongation and a standard short circuit standard neck determination threshold determination module configured to determine a standard neck determination threshold under a standard dry elongation and a standard short circuit current slope;
a first offset module configured to determine an offset to a standard neck determination threshold for dry length variation;
a second compensation amount module configured to determine a compensation amount for a standard neck determination threshold for short circuit current slope change;
a necking determination threshold determination module connected to the standard necking determination threshold determination module, the first compensation amount module, and the second compensation amount module, the necking determination threshold determination module configured to determine a necking determination threshold based on the standard necking determination threshold, the compensation amount of the standard necking determination threshold for the change in dry elongation, and the compensation amount of the standard necking determination threshold for the change in short circuit current slope;
a neck detection module connected to the neck determination threshold determination module, the neck detection module being configured to detect whether or not neck is generated based on the neck determination threshold.
In an exemplary embodiment of the present disclosure, the compensation amount of the standard neck determination threshold for dry elongation variation is:
dv1＝(1+K 1 ×L 1 /L 0 )×dv0
wherein dv1 is the compensation of the standard necking decision threshold, K 1 Compensating the coefficient for changes in dry elongation, L 1 For actual dry elongation, L 0 Dv0 is the standard neck determination threshold for standard dry elongation.
In an exemplary embodiment of the disclosure, the compensation amount of the standard necking determination threshold for the slope change of the short-circuit current is:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein dv2 is the compensation of the standard necking decision threshold for the slope change of the short circuit current, K 2 Compensating coefficients for changes in the slope of the dry-short circuit current, DI/DT 1 For actual short-circuit current slope, DI/DT 0 For the short circuit current slope, dv0 is the standard necking decision threshold.
In an exemplary embodiment of the present disclosure, the necking determination threshold is:
dv＝dv0+dv1+dv2
wherein dv is a necking determination threshold.
According to another aspect of the present disclosure, a welder is provided that includes the detection system for neck in weld process described above.
The necking detection method in the welding process comprises the steps of determining the compensation amount of a standard necking judgment threshold value with the change of the dry elongation and the compensation amount of a standard necking judgment threshold value with the change of the short-circuit current slope according to the standard dry elongation and the standard necking judgment threshold value with the standard short-circuit current slope, determining the necking judgment threshold value according to the standard necking judgment threshold value, the compensation amount of the standard necking judgment threshold value with the change of the dry elongation and the compensation amount of the standard necking judgment threshold value with the change of the short-circuit current slope, and further detecting whether necking is generated or not, wherein the change of the dry elongation and the change of the short-circuit current slope are considered, so that the occurrence of necking can be accurately detected, and welding spatter is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a flow chart of a method of detecting necking during welding provided by an embodiment of the present disclosure;
FIG. 2 is a schematic view of a detection system for neck in welding process provided by an embodiment of the present disclosure;
fig. 3 is a voltage/current versus time waveform for normal dry elongation and long dry elongation during a welding process according to an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations or operations have not been shown or described in detail to avoid obscuring aspects of the invention.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
At present, the voltage change rate dv is usually adopted for determination, but when the dry elongation change is large in the welding process, that is, the resistance change on the dry elongation is large, the resistance can have a large influence on the voltage change rate, and in addition, the short-circuit current increase instruction can also be dynamically adjusted in the welding process, and can also have a large influence on the voltage change rate. Thus, the voltage change rate is greatly changed, which leads to a failure in detecting the neck.
There are two main types of necking detection errors: one is early detection, i.e., no necking has occurred but the welder believes that arcing has occurred, and the other is late detection or no detection of arcing. In the first case, the short-circuit time increases, the arc stability deteriorates, and the spatter increases. While the second case corresponds to a control failure and does not reduce splashing.
According to an aspect of the present disclosure, there is provided a detection method of a neck in a welding process, as shown in fig. 1, the detection method including:
step S100, determining a standard necking judgment threshold value under a standard dry elongation and a standard short circuit current slope;
s200, determining the compensation amount of a standard necking judgment threshold value of dry elongation change;
step S300, determining the compensation quantity of a standard necking judgment threshold value of the slope change of the short-circuit current;
step S400, determining a necking judgment threshold according to the sum of the standard necking judgment threshold, the compensation quantity of the standard necking judgment threshold with the change of the dry elongation and the compensation quantity of the standard necking judgment threshold with the change of the short-circuit current slope;
step S500, detecting whether necking is generated or not according to the necking judgment threshold value.
According to the method for detecting the necking in the welding process, the compensation quantity of the standard necking judgment threshold with the change of the dry elongation and the compensation quantity of the standard necking judgment threshold with the change of the short-circuit current slope are determined according to the standard dry elongation and the standard necking judgment threshold under the standard short-circuit current slope, the sum of the compensation quantity of the standard necking judgment threshold with the change of the dry elongation and the compensation quantity of the standard necking judgment threshold with the change of the short-circuit current slope is determined according to the standard necking judgment threshold, and whether the necking is generated or not is detected, and the change of the dry elongation and the change of the short-circuit current slope are considered, so that the occurrence of the necking can be accurately detected, and welding spatter is reduced.
Hereinafter, each step in the detection method of necking in the welding process of the present disclosure will be described in detail.
In step S100, a standard neck determination threshold is determined for a standard dry elongation and a standard short circuit current slope.
Specifically, the method of determining the occurrence of necking is to set a voltage change rate threshold, and perform necking control by considering that necking has occurred when the actual voltage change rate is greater than the set voltage change rate threshold. Rate of change of voltage in generalThe method for obtaining the threshold value comprises the following steps: at a standard dry elongation L 0 Dv = U was obtained by a number of welding experiments (different wire diameters, gases will be different, e.g. 15mm for 1.2 MAG) 1 -U 0 ＝I 1 *R-I 0 *R＝(I 1 -I 0 )*R。
Dry elongation L when dry elongation is varied, such as when actually welded 1 Dry elongation L greater than the number of entries 0 The resistance of the dry elongation, which is a function of the resistance d = f (r), can be calculated at the beginning of the short circuit, from which the exact value of the dry elongation can be derived. Wherein the correspondence of different dry elongations d and resistances R can be taken out by a large number of welds under experimental conditions.
Wherein the standard dry elongation (L) is taken from a large number of weld data under experimental conditions 0 ) Standard short circuit current slope (DI/DT) 0 ) The standard necking determination threshold dv0 for necking determination of (1).
In step S200, the compensation amount of the standard neck determination threshold for dry elongation variation is determined.
Specifically, during welding, when the dry elongation becomes long, as shown in fig. 3, at t 1 At the moment, the welding machine performs constant current control, and after the welding wire is well contacted with the base metal, the resistance value R can be calculated according to the feedback voltage and the feedback current 1 ＝U 1 /I 1 To ensure the correctness of the result, the average value can be obtained through multiple calculations. According to the function d = f (R) of the dry elongation and the resistance, the accurate value L of the dry elongation can be calculated 1 . At this time, the compensation dv1 of the standard necking determination threshold under the dry elongation L1 condition can be calculated as:
dv1＝(1+K 1 ×L 1 /L 0 )×dv0
wherein L is 1 For actual dry elongation, L 0 Is standard dry elongation, K 1 Compensating the coefficient for changes in dry elongation, K 1 Has a size of 0.01-0.1, K 1 The value of (A) is related to the actual dry elongation and the wire feeding speed, and a person skilled in the art can select K according to the actual welding effect 1 Is not limited thereto by the disclosureAnd (5) preparing.
In step S300, the amount of compensation for the standard neck determination threshold for short circuit current slope change is determined.
Specifically, in the welding process, in order to ensure smooth transition of molten droplets and stable electric arc, the welding machine can perform short circuit slope adjustment according to the last short circuit parameter, after the short circuit slope is adjusted, the necking detection threshold value should be correspondingly adjusted, and the compensation amount dv2 of the adjusted standard necking judgment threshold value for the change of the short circuit current slope is as follows:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein, DI/DT 1 For actual short-circuit current slope, DI/DT 0 For short-circuit current slope, K 2 Compensation factor for change in slope of dry short circuit current, K 2 Has a size of 0.01-0.1, K 2 The value of (A) is related to the actual short-circuit current slope and the wire feeding speed, and a person skilled in the art can select K according to the actual welding effect 2 Is not a limitation of the present disclosure.
In step S400, the neck determination threshold is determined based on the sum of the standard neck determination threshold, the compensation amount of the standard neck determination threshold for changes in dry elongation, and the compensation amount of the standard neck determination threshold for changes in short-circuit current slope.
Specifically, the necking determination threshold dv is:
dv＝dv0+dy1+dv
＝dv0+(1+K 1 ×L 1 /L 0 )×dv0+(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
in step S500, whether or not necking has occurred is detected based on the necking determination threshold.
Specifically, when the voltage change rate is larger than the necking determination threshold, the occurrence of necking is detected; and when the voltage change rate is smaller than the necking judgment threshold, detecting that no necking is generated. The change of the dry elongation and the change of the slope of the short-circuit current are considered during detection, so that the necking can be accurately detected, and welding spatter is reduced.
Embodiments of the disclosed system are described below, which may be used to perform the above-described detection methods of the present disclosure. For details that are not disclosed in the embodiments of the system of the present disclosure, please refer to the embodiments of the detection method of the present disclosure for the details that are not disclosed in the embodiments of the system of the present disclosure.
According to yet another aspect of the present disclosure, there is provided a detection system for a neck in a welding process, as shown in fig. 2, the detection system including:
a standard neck determination threshold determination module 710 configured to determine a standard neck determination threshold at a standard dry elongation and a standard short circuit current slope;
a first offset module 720 configured to determine an offset to a standard neck determination threshold for dry length variations;
a second compensation amount module 730 configured to determine an amount of compensation for a standard neck determination threshold for short circuit current slope change;
a necking determination threshold determining module 740 connected to the standard necking determination threshold determining module 710, the first compensation amount module 720, and the second compensation amount module 730, the necking determination threshold determining module being configured to determine a necking determination threshold based on the standard necking determination threshold, the compensation amount of the standard necking determination threshold for a change in dry elongation, and the compensation amount of the standard necking determination threshold for a change in short circuit current slope;
a neck detection module 750 connected to the neck determination threshold determination module 740 is configured to detect whether a neck is generated based on the neck determination threshold.
According to the system for detecting the necking in the welding process, the standard necking determination threshold determination module determines the compensation quantity of the standard necking determination threshold with the change of the dry elongation and the compensation quantity of the standard necking determination threshold with the change of the short-circuit current slope according to the standard dry elongation and the standard necking determination threshold with the standard short-circuit current slope, the first compensation quantity module and the second compensation quantity module determine the compensation quantity of the standard necking determination threshold with the change of the dry elongation and the compensation quantity of the standard necking determination threshold with the change of the short-circuit current slope, the necking determination threshold is determined, and the necking detection module and the necking determination threshold detect whether necking is generated or not.
Specifically, the method of determining the occurrence of necking is to set a voltage change rate threshold, and perform necking control by considering that necking has occurred when the actual voltage change rate is greater than the set voltage change rate threshold. The method for obtaining the voltage change rate threshold value comprises the following steps: at a standard dry elongation L 0 Dv = U1-U was obtained by a number of welding experiments (different wire diameters, gases will be different, e.g. 15mm for 1.2 MAG) 0 ＝I 1 *R-I 0 *R＝(I 1 -I 0 )*R。
Dry elongation L when dry elongation is varied, such as when actually welded 1 Dry elongation L greater than the number of entries 0 The resistance of the dry elongation, which is a function of the resistance d = f (r), can be calculated at the beginning of the short circuit, from which the exact value of the dry elongation can be derived. Wherein the correspondence of different dry elongations d and resistances R can be taken out by a large number of welds under experimental conditions.
The standard neck determination threshold dv0 for neck determination at the standard dry elongation (L0) and the standard short-circuit current slope (DI/DT 0) was extracted from a large amount of welding data under the experimental conditions.
Specifically, during welding, when the dry elongation becomes long, as shown in fig. 3, at t 1 At the moment, the welding machine carries out constant current control, after the welding wire is well contacted with the base metal, the first compensation quantity module can calculate the resistance value R according to the feedback voltage and the feedback current 1 ＝U 1 /I 1 To ensure the correctness of the result, the average value can be obtained through multiple calculations. According to the function d = f (R) of the dry elongation and the resistance, the accurate value L of the dry elongation can be calculated 1 . At the moment, the first compensation quantity module can calculate the dry elongation L 1 The compensation dv1 of the standard necking determination threshold under the conditions is:
dv1＝(1+K 1 ×L 1 /L 0 )×dv0
wherein, K 1 Compensating the coefficient for changes in dry elongation, L 1 For actual dry elongation, L 0 Standard dry elongation.
Specifically, in the welding process, in order to ensure smooth transition of molten droplets and stable electric arc, the welding machine can adjust the short circuit slope according to the last short circuit parameter, after the short circuit slope is adjusted, the necking detection threshold value should be correspondingly adjusted, and the compensation amount dv2 of the standard necking judgment threshold value of the short circuit current slope change adjusted by the second compensation amount module is as follows:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein, K 2 Compensating coefficients for changes in the slope of the dry short circuit current, DI/DT 1 For actual short-circuit current slope, DI/DT 0 Dv0 is the standard neck determination threshold for the short circuit current slope.
Specifically, the necking determination threshold dv determined by the necking determination threshold determination module is:
dv＝dv0+dv1+dv
＝dv0+(1+K 1 ×L 1 /L 0 )×dv0+(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
specifically, when the voltage change rate is greater than the necking determination threshold, the necking detection module detects that necking occurs; when the voltage change rate is smaller than the necking determination threshold, the necking detection module detects that necking is not generated. The necking detection module considers the change of dry elongation and the change of short-circuit current slope during detection, so that necking can be accurately detected, and welding spatter is reduced.
According to another aspect of the present disclosure, a welder is provided that includes the detection system for neck in weld process described above. For the beneficial effects of the welding machine, please refer to the above discussion about the beneficial effects of the detection system, and the details are not repeated herein.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the invention. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A detection method for necking in a welding process is characterized by comprising the following steps:
determining a standard necking judgment threshold value under the standard dry elongation and the standard short circuit current slope;
determining the compensation amount of a standard necking judgment threshold value of dry elongation change;
determining the compensation quantity of a standard necking judgment threshold value of the slope change of the short-circuit current;
determining a necking judgment threshold according to the sum of the standard necking judgment threshold, the compensation quantity of the standard necking judgment threshold for the change of the dry elongation and the compensation quantity of the standard necking judgment threshold for the change of the short-circuit current slope; wherein, the compensation amount of the standard necking judgment threshold value of the dry elongation change is as follows: dv1= (1+K) 1 ×L 1 /L 0 ) X dv0; wherein dv1 is a compensation amount of a standard necking determination threshold, K 1 Compensating the coefficient for changes in dry elongation, L 1 For actual dry elongation, L 0 The standard dry elongation is adopted, and dv0 is a standard necking determination threshold value;
and detecting whether necking is generated or not according to the necking judgment threshold value.
2. The detection method according to claim 1, wherein detecting whether or not necking is generated based on the necking determination threshold includes:
when the voltage change rate is larger than the necking judgment threshold value, detecting that necking is generated;
and when the voltage change rate is smaller than the necking judgment threshold, detecting that no necking is generated.
3. The detection method as claimed in claim 1, wherein the compensation amount of the standard necking determination threshold for the change in the slope of the short circuit current is:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein dv2 is the compensation of the standard necking decision threshold for the slope change of the short circuit current, K 2 Compensating coefficients for changes in the slope of the dry short circuit current, DI/DT 1 For actual short-circuit current slope, DI/DT 0 Dv0 is the standard neck determination threshold for the short circuit current slope.
4. The detection method as claimed in claim 3, wherein the neck determination threshold is:
dv＝dv0+dv1+dv2
wherein dv is a necking determination threshold.
5. A detection system for necking down in a welding process, comprising:
a standard neck determination threshold determination module configured to determine a standard neck determination threshold under a standard dry elongation and a standard short circuit current slope;
a first offset module configured to determine an offset to a standard neck determination threshold for dry length variation;
a second compensation amount module configured to determine a compensation amount for a standard neck determination threshold for short circuit current slope change;
a necking determination threshold determination module connected to the standard necking determination threshold determination module, the first compensation amount module, and the second compensation amount module, the necking determination threshold determination module configured to determine a necking determination threshold based on the standard necking determination threshold, the compensation amount of the standard necking determination threshold for the change in dry elongation, and the compensation amount of the standard necking determination threshold for the change in short circuit current slope; wherein, the compensation amount of the standard necking judgment threshold value of the dry elongation change is as follows: dv1= (1+K) 1 ×L 1 /L 0 ) X dv0; wherein dv1 is the compensation of the standard necking decision threshold, K 1 Compensating the coefficient for changes in dry elongation, L 1 For actual dry elongation, L 0 The standard dry elongation is adopted, and dv0 is a standard necking determination threshold value;
a neck detection module connected to the neck determination threshold determination module, the neck detection module being configured to detect whether or not neck is generated based on the neck determination threshold.
6. The detection system as claimed in claim 5, wherein the standard neck determination threshold for short circuit current slope variation is compensated by:
dv2＝(1+K 2 ×(DI/DT 1 -DI/DT 0 ))×dv0
wherein dv2 is the compensation of the standard necking decision threshold for the slope change of the short circuit current, K 2 Compensating coefficients for changes in the slope of the dry short circuit current, DI/DT 1 For actual short-circuit current slope, DI/DT 0 Dv0 is the standard neck determination threshold for the short circuit current slope.
7. The detection system as claimed in claim 6, wherein the necking determination threshold is:
dv＝dv0+dv1+dv2
wherein dv is a necking determination threshold.
8. A welding machine comprising a detection system for neck in weld process as claimed in any one of claims 5 to 7.
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