CN104977305A - Welding quality analysis device based on infrared vision and analysis method thereof - Google Patents
Welding quality analysis device based on infrared vision and analysis method thereof Download PDFInfo
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Abstract
The invention discloses a welding quality analysis device based on infrared vision and an analysis method thereof. The analysis device comprises an infrared vision collecting system that is adjustably and fixedly connected to a welding facility, a vision processing system, in which welding defect intelligent recognition algorithm is embedded, and a feed control system, which can evaluate the welding quality, give an alarm, and adjust the parameters of the welding facility. The analysis method comprises the following steps: (1) collecting the infrared vision information of a molten pool or an area near a molten pool in real time through infrared sensing; (2) processing the infrared vision information by the welding defect intelligent recognition algorithm so as to obtain the weld seam positions and welding defect characteristics; (3) evaluating the welding quality in real time, and controlling the welding facility and giving an alarm aiming at different welding defects. According to the provided intelligent analysis device and intelligent analysis method, the welding process can be monitored in real time, the welding defects can be recognized, the welding seam position can be traced, the welding quality can be evaluated, the welding loss can be reduced, and the finished product yield rate can be increased.
Description
Technical field
The invention belongs to infrared visual monitoring welder field, more specifically, relate to a kind of welding quality analytical equipment based on infrared vision and analytical approach.
Background technology
Along with the lifting of traditional industry level requirement, at welding field (as TIG weldering, MIG weldering, CO
2gas protects weldering, covered arc welding, high frequency resistance welding, Laser Welding (LBW) etc.), up to standard in order to ensure the mechanical property of weldment, usability and security performance, welding quality requires also constantly not strictly.And affect by factors such as environment, material, equipment, weld defects is can hardly be avoided, and it is qualified that this makes important weldment all will guarantee through quality testing.According to investigations, in welded tube field, China's welded still pipe annual production has reached 5,000 ten thousand tons, but the scrap wherein caused because of weld defects accounts for 5.4%, at automotive field, about have 8,000 ten thousand pieces of Automobile Plate to need welding every year, the special welding fields such as this other boats and ships external, space flight, building, biomaterials, to the high-quality of welding, it ensures that requirement is higher.
And at present at welding quality analysis field, common nondestructive testing method has UT (Ultrasonic Testing), electromagnetic test and radiographic inspection etc., these method of detection expenses all costly, the large and all detections after weldment is shaped of workload.Now weld defects is formed, and product can only be scrapped as defective, this waste that very easily causes damage.Therefore, industrial need a kind of device that can carry out Intelligent Recognition weld defects Real-Time Monitoring welding quality, namely can check in real time in welding process, once have identified defect, the device of taking measures also is fed back in alarm immediately.
In welding process sensing, visual sensing especially infrared sensing (by visual sensing and temperature sensing set) has the features such as reliability is strong, informative.Comparatively feasible in this, as the foundation passing judgment on welding quality in real time.At present, the welding quality relevant apparatus about Real-Time Monitoring in prior art can be divided into 4 kinds: 1) weld seam bath properties correlation method; 2) welding current voltage correlation method; 3) only for techniques such as laser bonding; 4) position while welding back tracking method.A patent if number of patent application is 201010105629: " a kind of visual detection sensing unit ", it uses visual sensing in robotic laser's welding process to obtain postwelding surface topography quality, weld seam route and the change of Real-Time Monitoring laser weld pools before tracking welding, serve certain effect, but the molten bath change be confined in welding, mainly Normal visual process in welding quality, does not use the infrared vision being rich in temperature information.Welding quality monitoring mode is also only for laser bonding.And for example number of patent application is a patented claim of 201310133509: " robot welding quality visual pick-up unit and detection method thereof ", vision rifle is connected on welding arm and follows arc welding gun head motion by it, the picture scanned and lane database data contrast, and FEEDBACK CONTROL, there is certain effect, but vision rifle adopts Normal visual rifle in this patent, fixed form is only mentioned and being connected with welding arm, situation for manual welding or other welding arms is more difficult satisfied, the comparison with former database is more partial in image procossing, be not that real-time Intelligent Recognition lacks judgement to the defect that former lane database does not have, its feedback control system is comparatively fuzzy in addition.For another example patent documentation in addition: " narrow gap welding monitoring and weld seam deviation detection method based on infrared visual sensing ", employ infrared vision, but its application is confined to narrow gap welding, weld seam deviation monitoring is also only aimed to the monitoring of welding process, does not consider the monitoring of other weld defects.Also has the device using current and voltage method correlation analysis welding quality on the other hand, due to the impact of the material in welding process, environment, human factor, these data can not reflect the change of welding quality completely, and the result thus analyzed has the shortcomings such as accuracy is low, poor reliability, randomness are large.
Summary of the invention
For above deficiency or the Improvement requirement of prior art, the invention provides a kind of welding quality analytical equipment based on infrared vision and analytical approach, can be applicable to TIG weldering, MIG weldering, CO
2gas protects the main flow welding production fields such as weldering, Laser Welding (LBW), electric resistance welding, its object is to by namely using the real-time intelligent means of identification based on infrared vision to replace poor efficiency, the detection means that single, reliability is low to the significant improvement of Welding quality test device in the past, solve the technical matters of the real-time complete monitoring of welding overall process thus, and provide precision high and welding quality analysis and feedback measure accurately.
For achieving the above object, according to one aspect of the present invention, provide a kind of welding quality analytical equipment based on infrared vision, it is characterized in that, this device comprises infrared vision collecting portion, visual information conversion and transport part, Vision information processing portion and feedback control section, be characterized in that described infrared vision collecting portion is for gathering in welding process the visual information of welding near thing molten bath, surface or molten bath, described Vision information processing portion is transferred to after described visual information conversion is changed with transport part, described Vision information processing portion processes above-mentioned visual information and process information result is transmitted in described feedback control section, described feedback control section carries out alarm and/or carries out adjustment to described Site Welding equipment (5) controlling according to above-mentioned process information result.
Further, described infrared vision collecting portion can fix separately or fix with described Site Welding equipment is adjustable.
Further; described infrared vision collecting portion is arranged in cabinet; described cabinet inside is fixed with the substrate in infrared vision collecting portion described in adjustable carrier; install standby arranged outside have splashproof device near described Site Welding bottom described cabinet, described cabinet bottom surface is provided with can the case lid of switch.
Further, the described adjustable unit between described infrared vision collecting portion and described Site Welding equipment is many handles articulated stand, and described cabinet is fixed in its one end, and one end is adjustable is fixed on described Site Welding equipment, and one end is as support end.
The invention allows for a kind of method that welding quality analytical equipment based on infrared vision carries out welding quality analysis, it is characterized in that, the method comprises the steps:
(1) fixing described cabinet, open the described infrared vision collecting portion of test, and debugging gets a clear view to Vision information processing portion;
(2) described Vision information processing portion arranges weld defects detection standard and flow process, after the data receiving described infrared vision collecting portion, according to the above-mentioned examination criteria that sets and flow process to carry out defect dipoles;
(3) if defect dipoles does not exceed standard, then described Vision information processing portion sends the order of continuation monitoring in described infrared vision collecting portion, if defect dipoles exceeds standard, then described Vision information processing portion Site Welding equipment according to superscale FEEDBACK CONTROL carries out welding adjustment.
Further, the weld defects detection flow process that the described Vision information processing portion in described step (2) is arranged is as follows:
(2-1) weld shape detects: a) define the edge of excellent weld seam, center line, shape, width and set up expert database; B) to gathering the edge feature of image, shape facility, picture traverse feature carry out determining defects, and to compare calculating defect rank with expert database;
(2-2) weld seam temperature field is detected: a) temperature field of excellent weld seam is carried out to threshold values definition and set up expert database; B) colour of the infrared image of collection, gray scale, pixel etc. extracted temperature information according to demarcation and set up temperature field, the distribution rationality of analysis temperature field, and comparing calculating defect rank with experts database;
(2-3) the weld shape detection in described step (2-1) and the weld seam temperature field detection in step (2-2) are analyzed further, carry out burn-through, lack of penetration, heat input is unstable or the Determination of gas hole defect.
Further, the FEEDBACK CONTROL adjustment in described step (3) is as follows:
If burn-through defect exceeds standard, then described feedback control section sends a warning and controls Site Welding equipment and stops welding and adjusting, if burn-through defect does not exceed standard, then described feedback control section controls described Site Welding device adjust its speed of welding, curtage according to the burn-through grade divided;
If defect is judged as heat, input is unstable, then described feedback control section controls described Site Welding equipment and adjusts its voltage, current fluctuation and wire feed situation;
If gas hole defect exceeds standard; then described feedback control section sends a warning and controls described Site Welding equipment and stops welding and adjusting; if gas hole defect does not exceed standard, then described feedback control section regulates the flow of Site Welding equipment to its welding protection gas to regulate.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
In welding process, overall process can be carried out to weldment quality to check in real time, Intelligent Recognition goes out more comprehensive weld defects and position while welding and alarm in time and feed back to welder and adjust accordingly, at utmost reduce the regeneration of defect, reduce the loss: A) replace inspection after welding with the monitoring of real-time overall process; B) dynamic tracing weld seam, Intelligent Recognition defect, and in time alarm, feedback welding gear reduce idle work; C) review welding overall process, assessment also improves welding quality indirectly; D) replace labour saving labour, can be applicable to the main flow welding production field such as TIG weldering, MIG weldering, CO2 gas guarantor weldering, Laser Welding (LBW), electric resistance welding, industrial automation level can be improved;
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the welding quality analytical equipment based on infrared vision according to the present invention's realization;
Fig. 2 is the embodiment structural representation of the welding quality analytical equipment based on infrared vision according to the present invention's realization;
Fig. 3 be according to the present invention realize based on the detailed structure schematic diagram based on the adjustable support in the welding quality analytical equipment of infrared vision;
The workflow schematic diagram of the welding quality analytical approach based on infrared vision that Fig. 4 realizes according to the present invention;
Fig. 5 is the image processing flow figure in the infrared vision collecting portion according to the present invention's realization;
Fig. 6 is the defects detection process flow diagram realized according to the present invention.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
The conversion of 1-infrared vision collecting portion 2-visual information assists filter 16-computing machine 17-cabinet 18-accessory power supply 19-flexible circuit conductor 20-image pick-up card 21-fixed head 22-splashproof plate 23-cooling device 24-case lid 25-alarm device 26-data line 27-collar 28-spider 29-clamp 30-knob with 3-Vision information processing portion, transport part 4-feedback control section 5-Site Welding equipment 6-auxiliary protection 7-weld seam 8-welded object 9-screw 10-substrate 11-guide rail 12-tooth bar 13-adjusting gear 14-infrared collecting device 15-
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
As shown in Figure 1, a kind of welding quality monitoring device based on infrared vision provided by the invention, primarily of several part composition such as infrared vision collecting portion, Vision information processing portion and feedback control section.
Wherein infrared vision collecting portion 1 mainly comprises infrared CCD or thermal infrared imager or infrared camera or infrared thermometer or infrared image sensor.Infrared vision collecting portion 1 is used for gathering the infrared visual information of welded object 8 surface weld 7.Auxiliary protection 6 can be filter or cooling device or anti-splashing device.Filter can in bad environments situation, and len filters arc light if desired and reduces interference.Cooling device 23 can be that water cooling plant or air-cooling apparatus prevent infrared vision collecting portion temperature too high.Anti-splashing device can prevent high-temperature metal from splashing and cause damage to camera lens.
Wherein visual information conversion mainly comprises image pick-up card 20, data communication module, data-interface and data bus with transport part 2.Data-interface can be RS232 type or RS485 type or USB type.The information that infrared Visual Sampling portion 1 gathers mainly carries out compressing or changing or encode with transmission 2 and it is carried out subsequent treatment by Interface and Communication module transfer to Vision information processing portion 3 by visual information conversion.
Wherein Vision information processing portion 3 receives the infrared visual image information coming from visual information conversion and transport part 2, it is processed, Vision information processing portion 3 can be computing machine 16, also can be industrial computer or workstation etc., and it comprises image processing system, storage sites.Image processing system by: image processing software, expert database, defect Intelligent Recognition algorithm, welding quality intelligent evaluation system form.Storage sites can store the information of welding overall process.
The information that wherein feedback control section 4 primary recipient comes Vision information processing portion 3 carries out feedback adjusting or alarm, the mode of feedback adjusting mainly realizes by realizing the adjustment of corresponding welding parameter to Site Welding equipment, communication between above-mentioned parts adopts data line of the prior art or communication to communicate, and does not repeat them here.
As shown in Figure 2,3, it is as follows that the one that the present invention is based on infrared vision welding quality intellectual analysis device specifically installs set-up mode:
Wherein above-mentioned infrared vision collecting portion 1 changes with visual information and is installed in cabinet 17 with transport part 2, and cabinet 17 inside has substrate 10.Its right flank of cabinet 17 has groove.Cabinet 17 top has the interface of internal data line.There is case lid 24 bottom cabinet 17, when device does not use, case lid can be closed and clean to keep inner clean.Cabinet 17 left side wall is equipped with splashproof plate 22, when high temperature splash is more serious in welding process, plays the effect of protection cabinet inside part.In addition when welding arc light and disturbing comparatively serious to welding collection, also can cover arc light by baffle plate, reduce the interference of image noise.
Substrate 10 and cabinet 17 are fixed by screw or bolt.Infrared collecting device 14 is fixed on guide rail 11, and infrared collecting device 14 focuses on by up-down adjustment position.Guide rail 11 is fixed by screw 9 with substrate 10.The fuselage right side wall of infrared collecting device 14 is equipped with tooth bar 12, and tooth bar 12 engages with adjusting gear 13.The central shaft of adjusting gear 13 is fixed on on the right side of cabinet, therefore can be realized the fine setting up and down of infrared collecting device 14 by slidable adjustment gear 13.Infrared collecting device 14 is connected by the flexible circuit conductor 19 that can bend and stretch with between accessory power supply 18, image pick-up card 20, and ensure that infrared collecting device 14 is when moving up and down, wire can not be pulled off.Substrate 10 has plugged auxiliary filter 15 in order to filter arc light in addition in infrared collecting device 14 bottom, in bad environments situation, also can len.Auxiliary filter 15 can be extracted, for changing no filtering specification.Be mounted with cooling back installation 23 around infrared collecting device 14 fuselage, avoid long-time welding to cause device temperature too high.
And this cabinet 17 is mainly fixed by adjustable unit fixed support 21 carry out soldering test monitoring on welder, fixed support 21 is three handle articulated stands, one end of fixed support 21 and cabinet 17 are fixed by bolt screw or the collar 27, fixed support 21 other end is clamp 29, the support end of fixed support 21 is spider 28, hinged place is knob 30, is specifically made up of bolt, the collar, pad, nut.Require during device busy that infrared collecting device 14 maintains static to improve image quality stability.If welding place, space allows, three-legged support 28 can be placed in level ground, in order to support cabinet 17.The length of three-legged support 28 can be shunk, and the clamp 29 of the other end is fixed on adjustable for cabinet 17 on Site Welding equipment 5.
As shown in Figure 4, the working method of the welding quality intellectual analysis device based on infrared vision in the present invention is as follows:
1. fix this device according to produced on-site line situation, this device can consider the factors such as space, safety, convenience to be fixed adjustable for cabinet 17 being fixed on corresponding Site Welding equipment or by cabinet 17 separately.During work, cabinet 17 maintains static.If robot line for welding space is comparatively large, then cabinet 17 can be supported ground by spider 28 and fix; If the inconvenience of welding robot production line spaces compact fixes this device with the form of tripod, then cabinet 17 can be fixed on Site Welding equipment 5 by clamp 29 is adjustable.
2. obtain the best according to welding actual conditions regulating device height and adopt bat distance, infrared vision collecting portion 1 can focus manually or automatically make collection information more accurately and reliably, obtain the best according to welding actual conditions regulating device height and adopt bat distance, by spider 28 contraction or regulate hinged knob 30 to realize significantly regulating, utilize the adjusting gear 13 pairs of infrared collecting devices 14 on the right side of device highly to finely tune, the camera lens of infrared collecting device 14 can rotate by a small margin to direction.
3. connect various data power line, open infrared collecting device or infrared switch in Vision information processing portion 3, and according to actual photographed effect regulating parameter to getting a clear view.During work, the weld seam 7 for soldered thing 8 surface can use picture interval drainage pattern, also can overall process recording mode.
4. after assurance device safety is fixed, production line welding can be started, computing machine 16 end simultaneously in Vision information processing portion 3 can real time inspection shooting area weld seam infrared figure (or dynamic image) and carry out the Intelligent Recognition of weld defect and position while welding is followed the tracks of.
Wherein infrared Visual Sampling portion 1 gathers the weld seam infrared information near molten bath, welded article surface or molten bath, and is electric signal by its infrared temperature convert information.Image pick-up card the information that infrared Visual Sampling portion 1 collects is processed further to be converted into visual image information, and information is transferred to place of Vision information processing portion 3 and carries out image procossing after conversion.
Feedback control section 4 is made up of alarm device and feedback regulation mechanism, welding quality standard is preset in Vision information processing portion before work, if detect weld defects, exceed default standard, feedback control section 4 can give the alarm, relevant remedial measures is taked in prompting, and carries out parameter regulation and control according to defect rank to Site Welding device systems.
As shown in Figure 5,6, following process is comprised according to the welding quality analytical approach based on infrared vision of the present invention:
(1) fixing cabinet 17, after debugging firm stable, opens and debug infrared vision collecting portion 1, and debugging gets a clear view to place of Vision information processing portion 3;
(2) Vision information processing portion 3 arranges weld defects detection type and flow process, after receiving visual information conversion and the data of transport part 2, according to the above-mentioned type of detection that sets and flow process to carry out defect dipoles;
(3) if defect dipoles does not exceed standard, then control part sends the order of continuation monitoring in infrared vision collecting portion, if defect dipoles exceeds standard, then control part carries out welding adjustment according to superscale FEEDBACK CONTROL Site Welding equipment.
Wherein, the main algorithm of image procossing that comprises of Vision information processing portion 3 and evaluation rule are: 1) the feature expert database of multiple weld defects; 2) weld seam graphics disposal route; 3) based on the weld defect Intelligent Recognition operator of pattern-recognition, genetic algorithm, BP neural network algorithm, depth analysis; 4) weldquality assessment algorithm; 5) alarm and feedback pass judgment on mechanism, but are not limited to above-mentioned, owing to combining the comprehensive Real-Time Monitoring of number of drawbacks feature in the present invention, the present invention relates to but be not limited to above-mentioned algorithm.
Digital image recognition process feature is: analyzing and detecting is multithreading sequential analysis.First flow process first analyzes the edge feature of weld image, shape facility, width characteristics, judge according to definition and with excellent characteristics of weld seam (experts database) comparison, if defect rank is in authorized range, then weld shape is reasonable, and deviation is normal; If defect rank exceeds standard, then directly alarm.The colour of weld image, gray scale, pixel, on the basis of first flow process, are extracted temperature information according to demarcation and set up temperature field by second flow process, by the temperature field of extraction and excellent weld seam temperature field (experts database) comparison.If reasonable at thermo parameters method, then welding quality is normal; Otherwise carry out the 3rd flow process.3rd flow process carries out temperature extraction, shape facility identification to unusual position, temperature field on the basis of the second flow process, and with the comparison of experts database standard value, carry out the detection of the defects such as burn-through, lack of penetration, heat input instability, pore.Flow process four defines defect rank on the basis of flow process three.If defect rank exceeds standard, then record also alarm.
Welding Intelligence Feedback process feature is: for the weld image edge, the width that detect, if detect, deviation appears in position while welding, then carry out feedback regulation by data transmission Butt welding gun position, adjusting size is determined according to departure.More many-sided defect for other is mainly as follows:
If burn-through defect exceeds standard, then give the alarm and stop welding.Defect in normal range, then analyzes speed of welding, welding current, voltage; And welding system is regulated and controled, increase speed of welding or reduce welding current, concrete regulated quantity is determined according to defect rank.
Incomplete penetration defect exceeds standard, then give the alarm, and stop or repair welding again, defect in normal range, then analyzes speed of welding, weldingvoltage electric current; And welding system is regulated and controled, reduce speed of welding increase of weld current, concrete regulated quantity is determined according to defect rank.
Heat input is unstable, analyzes fluctuation situation, the wire feed rate of welding current voltage, carries out voltage stabilizing, steady flow measure and changes welding wire or adjustment welding wire feeding rate.
If gas hole defect exceeds standard, then give the alarm, stop welding.Whether normally pore is not obvious then analyzes shield gas flow rate size, and regulate shield gas flow rate, concrete regulated quantity is determined according to defect rank.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the welding quality analytical equipment based on infrared vision, it is characterized in that, this device comprises infrared vision collecting portion (1), visual information conversion and transport part (2), Vision information processing portion (3) and feedback control section (4), be characterized in that described infrared vision collecting portion (1) is for gathering in welding process the visual information of welding near thing molten bath, surface or molten bath, visual information transfers to described Vision information processing portion (3) after described visual information conversion is changed with transport part (2), described Vision information processing portion (3) processes above-mentioned visual information and process information result is transmitted in described feedback control section (4), described feedback control section (4) carries out alarm and/or carries out adjustment to described Site Welding equipment (5) controlling according to above-mentioned process information result.
2. as claimed in claim 1 based on the welding quality analytical equipment of infrared vision, it is characterized in that, described infrared vision collecting portion (1) can be fixed separately or be fixed with described Site Welding equipment (5) is adjustable.
3. as claimed in claim 1 or 2 based on the welding quality analytical equipment of infrared vision; it is characterized in that; described infrared vision collecting portion (1) is arranged in cabinet (17); described cabinet (17) inside is fixed with the substrate (10) in infrared vision collecting portion described in adjustable carrier; described cabinet (17) has splashproof device (22) near the arranged outside of described Site Welding equipment (5), and described cabinet (17) bottom surface is provided with can the case lid (24) of switch.
4. as claimed in claim 3 based on the welding quality analytical equipment of infrared vision, it is characterized in that, described adjustable unit between described infrared vision collecting portion (1) and described Site Welding equipment (5) is many handles articulated stand, described cabinet is fixed in its one end, one end is adjustable is fixed on described Site Welding equipment (5), and one end is as support end.
5. utilize the welding quality analytical equipment based on infrared vision as any one in claim 1-4 to carry out a method for welding quality analysis, it is characterized in that, the method comprises the steps:
(1) fixing described cabinet (17), open the described infrared vision collecting portion (1) of test, and debugging gets a clear view to Vision information processing portion (3) place;
(2) described Vision information processing portion (2) arranges weld defects detection standard and flow process, after the data receiving described infrared vision collecting portion (1), according to the above-mentioned examination criteria that sets and flow process to carry out defect dipoles;
(3) if defect dipoles does not exceed standard, then the transmission of described Vision information processing portion (3) continues the order of monitoring in described infrared vision collecting portion (1), if defect dipoles exceeds standard, then described Vision information processing portion (3) Site Welding equipment (5) according to superscale FEEDBACK CONTROL carries out welding adjustment.
6. welding quality analytical approach as claimed in claim 5, it is characterized in that, the weld defects detection flow process that the described Vision information processing portion (3) in described step (2) is arranged is as follows:
(2-1) weld shape detects: a) define the edge of excellent weld seam, center line, shape, width and set up expert database; B) to gathering the edge feature of image, shape facility, picture traverse feature carry out determining defects, and to compare calculating defect rank with expert database;
(2-2) weld seam temperature field is detected: a) temperature field of excellent weld seam is carried out to threshold values definition and set up expert database; B) colour of the infrared image of collection, gray scale, pixel etc. extracted temperature information according to demarcation and set up temperature field, the distribution rationality of analysis temperature field, and comparing calculating defect rank with experts database;
(2-3) the weld shape detection in described step (2-1) and the weld seam temperature field detection in step (2-2) are analyzed further, carry out burn-through, lack of penetration, heat input is unstable or the Determination of gas hole defect.
7. welding quality analytical approach as claimed in claim 6, is characterized in that, the FEEDBACK CONTROL adjustment in described step (3) is as follows:
For burn-through defect, if defect exceeds standard, then described feedback control section sends a warning and controls Site Welding equipment and stops welding and adjusting, if burn-through defect does not exceed standard, then described feedback control section (4) controls described Site Welding device adjust its parameter such as speed of welding, curtage according to the burn-through grade divided;
Input unstable defect for heat, then described feedback control section (4) controls described Site Welding equipment and adjusts its voltage, current fluctuation and wire feed situation;
For incomplete penetration defect, if defect exceeds standard, then give the alarm, stop or repair welding again, defect in normal range, then analyzes speed of welding, weldingvoltage electric current; And welding system is regulated and controled, reduce speed of welding increase of weld current, concrete regulated quantity is determined according to defect rank.
For gas hole defect; if defect exceeds standard; then described feedback control section (4) sends a warning and controls the stopping of described Site Welding equipment (5) and welds and adjust; if gas hole defect does not exceed standard, then described feedback control section (4) regulates the flow of Site Welding equipment to its welding protection gas to regulate.
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