CN111715980B - Device, system and method for quantitatively controlling pipeline argon arc spot welding process parameters - Google Patents
Device, system and method for quantitatively controlling pipeline argon arc spot welding process parameters Download PDFInfo
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- CN111715980B CN111715980B CN202010496632.7A CN202010496632A CN111715980B CN 111715980 B CN111715980 B CN 111715980B CN 202010496632 A CN202010496632 A CN 202010496632A CN 111715980 B CN111715980 B CN 111715980B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- 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
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/287—Supporting devices for electrode holders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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Abstract
The invention relates to a quantitative control device for pipeline argon arc spot welding process parameters in the technical field of welding, which comprises a welding torch component and a clamping device; the welding torch assembly comprises a tungsten electrode clamping inner core, a tungsten electrode clamping outer sleeve and a base, wherein the tungsten electrode clamping inner core, the tungsten electrode clamping outer sleeve and the base are all of a boss type open cylinder structure, and the tungsten electrode clamping inner core, the tungsten electrode clamping outer sleeve and the base are sequentially sleeved and connected from inside to outside; the clamping device is provided with a clamping part and a joint part, the pipe fitting to be welded is fixedly positioned through the clamping part, the base is connected in the joint part, and the extension line of the central axis of the tungsten electrode clamping inner core penetrates through the butt joint of the pipe fitting to be welded. The invention also provides a system and a method for quantitatively controlling the pipeline argon arc spot welding process parameters. The invention solves the problems that the butt assembly and the positioning of the parts to be welded depend on the experience of an operator in the traditional manual welding mode, the height of a tungsten electrode and the arc angle in the welding process are artificially controlled, and the forming quality of a welding spot is influenced.
Description
Technical Field
The invention relates to the technical field of design and application of positioning spot welding process equipment at a connecting part of a cabin pipeline of an aerospace craft, in particular to a device, a system and a method for quantitatively controlling pipeline argon arc spot welding process parameters.
Background
The argon arc tack welding at the connecting part of the cabin pipeline of the aerospace craft adopts manual welding, the 1 st and 2 nd workpieces to be welded which are fixed by spot welding are axially staggered and separated, the forming quality of the welding spot depends on the experience of an operator, and the problems of incomplete welding forming, excessive welding leakage, blockage of an inner hole of a guide pipe and the like caused by the oversize assembling staggered size of the workpieces to be welded are easily caused. The technical problem to be solved by technical personnel in the field at present is to find a welding device and method application for quantitatively controlling argon arc spot welding automatic welding on a space flight vehicle cabin segment satellite so as to quantify welding process parameters such as tungsten electrode height, arc action angle, welding current, current duration and the like and provide good assembly precision for subsequent all-position welding of a to-be-welded part.
The retrieval of the prior art shows that the Chinese invention patent publication No. CN102500880B discloses a tungsten argon arc welding control device, a direct current welding machine or a TIG welding machine is electrically connected with a workpiece through a welding ground wire, the direct current welding machine or the TIG welding machine is electrically connected with a welding gun through a welding cable, at least one argon bottle is communicated with at least one input end of the argon control device through a pipeline, the output end of the argon control device is communicated with the welding gun through a pipeline, and the argon control device is electrically connected with a control button on the welding gun through a control cable; in the argon control device, a first electromagnetic valve coil and a second electromagnetic valve coil in the secondary side of a transformer are connected in parallel, a second switch is a change-over switch, and when the second switch is positioned at a B position, the second switch is connected with a control button in parallel; when the second switch is positioned at the A position, the second switch is connected with the control button in series on the branch of the first electromagnetic valve coil. Compared with a TIG welding argon gas control system, the invention improves the welding quality, and saves the argon gas utilization ratio by 2-28%. The patent suffers from the corresponding problems described above.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device, a system and a method for quantitatively controlling the parameters of the argon arc spot welding process of a pipeline.
The invention provides a quantitative control device for pipeline argon arc spot welding process parameters, which comprises a welding torch component and a clamping device;
the welding torch assembly comprises a tungsten electrode clamping inner core, a tungsten electrode clamping outer sleeve and a base, wherein the tungsten electrode clamping inner core, the tungsten electrode clamping outer sleeve and the base are all of a boss type open barrel structure, and the tungsten electrode clamping inner core, the tungsten electrode clamping outer sleeve and the base are sequentially sleeved and connected from inside to outside;
the clamping device is provided with a clamping part and a joint part, the pipe fitting to be welded is fixedly positioned through the clamping part, the base is connected in the joint part, and an extension line of a central axis of the tungsten electrode clamping inner core penetrates through a butt joint of the pipe fitting to be welded.
In some embodiments, the outer periphery of the tungsten electrode clamping core is provided with a groove, and the groove is used as a passage of an internal gas path of the welding torch assembly.
In some embodiments, the end face of the tungsten electrode clamping outer sleeve is provided with a chamfered surface, and the end part of the tungsten electrode clamping inner core is in contact with the chamfered surface.
In some embodiments, the clip portion comprises a plurality of arc line grooves.
In some embodiments, the tungsten electrode clamping device further comprises a height positioning tool, the height positioning tool is detachably connected in the clamping part, the surface of the height positioning tool is connected with a height adjusting sheet, and an extension line of the central axis of the tungsten electrode clamping inner core is intersected with the height adjusting sheet.
In some embodiments, the height-adjusting piece has a thickness of 0.5 to 0.7mm.
The invention also provides a quantitative control system for the technological parameters of the pipeline argon arc spot welding, which comprises an automatic argon arc welding control device, an arc welding electric adapter, a tungsten electrode and the quantitative control device for the technological parameters of the pipeline argon arc spot welding;
the tungsten electrode clamping outer sleeve is connected with the automatic argon arc welding control device through the arc welding electric adapter, and after the tungsten electrode is clamped in the tungsten electrode clamping inner core, the tip of the tungsten electrode extends out of the welding torch assembly.
In some embodiments, the welding seam observing device further comprises a welding seam observing tool, and the welding seam observing tool is detachably connected with the joint part.
The invention also provides a quantitative control method for the technological parameters of the pipeline argon arc spot welding, which adopts the quantitative control system for the technological parameters of the pipeline argon arc spot welding and comprises the following steps:
step 1, pretreating and pre-assembling a pipe fitting to be welded;
and 5, checking the quality of the formed surface of the welding spot.
In some embodiments, the step 2 of assembling the simulated welding torch specifically comprises the following steps:
2.1, selecting the height positioning tool with the specification consistent with that of the pipe fitting to be welded, installing the height positioning tool in the clamping part, and fastening;
step 2.2: installing the tungsten electrode clamping sleeve in the base, and screwing the tungsten electrode clamping sleeve to a stop position;
step 2.3: installing the base provided with the tungsten electrode clamping sleeve in the clamping device, and screwing the base to a stop position;
step 2.4: and (3) loading the tungsten electrode with the processed tip into a center hole of a tungsten electrode clamping inner core, enabling the tip of the tungsten electrode to be tightly attached to the height positioning tool through free falling of the tungsten electrode, screwing the tungsten electrode clamping inner core to a stop position, and simulating the completion of welding torch installation.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention replaces the traditional manual welding mode of positioning welding at the cabin section pipeline joint of the aerospace craft, adopts the cabin section positioning auxiliary tool to be connected with the welding machine head handle and the automatic argon arc welding control system, realizes the electric and gas on-off control in the welding process, and solves the problems that the butt assembly and positioning of the parts to be welded depend on the experience of an operator, the height of a tungsten electrode and the arc angle in the welding process are artificially controlled, and the forming quality of a welding point is influenced in the traditional manual welding mode.
2. The invention provides a quantitative control device for pipeline argon arc spot welding process parameters, which is formed by designing and applying a clamping and welding integrated welding torch of a welding system through a welding torch component.
3. The invention realizes the automatic welding of the positioning welding procedure at the connecting part of the cabin pipeline of the spacecraft, quantifies the technological parameters such as the height of a tungsten electrode, the angle of an electric arc and the like, and avoids the problems of unstable batch quality caused by manual welding depending on human experience in the welding process, such as tungsten inclusion, oversize or undersize welding spots and other defects of uneven spot welding forming.
4. The invention realizes the automatic welding of the positioning welding at the connecting part of the cabin pipeline of the aerospace craft, the guide pipe clamping tool has the self-adaptive adjustment of the clamping position of the part to be welded, improves the butt joint precision of the pipe parts to be welded, provides good assembly precision for the subsequent all-position automatic argon arc welding of the part to be welded, avoids the problems of incomplete welding forming, large welding leakage, blockage of the inner hole of the guide pipe and the like caused by the over-error of the assembly misalignment size of the part to be welded, and improves the qualification rate of the welding seam of the cabin pipeline of the aerospace craft.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of the overall structure of the device for quantitatively controlling parameters of the argon arc spot welding process of the pipeline according to the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a schematic view of a simulated welding torch with tungsten electrode attached according to the present invention
FIG. 4 is a schematic cross-sectional view of a tungsten electrode clamping core of the present invention;
FIG. 5 is a schematic view of a clamping device according to the present invention;
FIG. 6 is a schematic structural view of a height positioning tool according to the present invention;
FIG. 7 is a schematic view of the process for adjusting the height of the tungsten tip of the present invention;
FIG. 8 is a schematic view of the structure of the combination of the welding seam observation tool and the clamping device of the present invention;
FIG. 9 is a schematic view of the overall structure of a quantitative control system for argon arc spot welding process parameters of a pipeline according to the present invention;
FIG. 10 is an enlarged view of a portion B of FIG. 9;
FIG. 11 is a flow chart of a quantitative control method for parameters of the argon arc spot welding process for pipelines according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the invention.
Example 1
As shown in fig. 1-10, the present invention provides a quantitative control device for parameters of a pipeline argon arc spot welding process, which includes a welding torch assembly 1 and a clamping device 2, wherein the height between a tungsten electrode 6 for welding and a weld joint is adjusted by installing and allocating the welding torch assembly 1 and the clamping device 2, so as to improve the spot welding precision, and the specific description is as follows:
the welding torch component 1 comprises a tungsten electrode clamping inner core 11, a tungsten electrode clamping outer sleeve 12 and a base 13, wherein the base 13 is preferably a ceramic base, the tungsten electrode clamping inner core 11, the tungsten electrode clamping outer sleeve 12 and the base 13 are all in a boss type open cylinder structure, the inner diameters of the three are different, the three are connected in a sleeved mode, namely the tungsten electrode clamping inner core 11 is sleeved in a cylinder of the tungsten electrode clamping outer sleeve 12, the tungsten electrode clamping outer sleeve 12 is sleeved in the cylinder of the base 13, and after the connection and the fixation, the central axes of the tungsten electrode clamping inner core 11, the tungsten electrode clamping outer sleeve 12 and the base 12 are superposed; in addition, the outer circumferential surface of the tungsten electrode holding core 11 is provided with a plurality of grooves 110, and preferably, three grooves 110 parallel to each other are provided at equal intervals along the outer circumferential surface, and the grooves 110 are used as a passage of an internal gas path of the torch assembly 1, specifically, a gas passage of a shielding gas argon gas.
The clamping device 2 is provided with a clamping part 21 and a joint part 22, the clamping part 21 is used for clamping a pipe fitting to be welded and fixing the pipe fitting to be welded, the clamping part 21 can be used for clamping the pipe fitting to be welded within a certain diameter range, the clamping of the clamping part 21 comprises two clamping blocks which are respectively marked as a clamping block 201 and a clamping block 202, the two clamping blocks are in open-close butt joint through a positioning ring 203 and a core rod 204 and are fastened through a screw 205 and the like, and the clamping of a pipeline to be welded and the alignment of the tip of a tungsten electrode to the seam of the pipeline to be welded are realized through the two clamping blocks. The arc line grooves 210 are respectively arranged on the clamping blocks 201 and 202, preferably, the two clamping blocks of the clamping part 21 realize the clamping of the pipeline to be welded through the design of the arc line grooves 210, and preferably, the two clamping blocks of the clamping part 21 are provided with 4 line cutting arc line grooves 210. The design of 4 linear cutting arc wire grooves arranged in the clamping part 21 is adopted, the groove width is preferably 1mm, the coaxial compression self-adaptive adjustment of two pipe fittings to be welded can be realized, the accurate control of the contact ratio of the center lines of the rotating axes of the two pipe fittings to be welded is realized, the axial misalignment of the two pipe fittings to be welded is controlled within 0.05mm, the gap is controlled within 0.10mm, the good assembly precision is provided for the subsequent all-position welding of the pipe fittings to be welded, the problems of incomplete penetration of welding forming, excessive welding leakage, uneven welding seam forming such as blockage of an inner hole of a guide pipe and the like caused by the over-error of the assembly misalignment of the pipe fittings to be welded are avoided, and the qualified rate of welding seams of pipelines of cabin sections of aircrafts is improved. Of course, the clamping portion 21 is also used for clamping other objects, such as a positioning tool. The joint part 22 is matched and connected with the base 13 and fixes the base, and the joint part 22 is provided with a hole matched with the base 13.
The base 13 is installed and fixed in the joint part 22, the pipe fitting to be welded is clamped and fixed in the clamping part 21, at the moment, the extension line of the central axis of the tungsten electrode clamping inner core 11 penetrates through the welding seam of the pipe fitting to be welded, the extension line of the central axis of the preferred tungsten electrode clamping inner core 11 penetrates through the center of the welding seam of the pipe fitting to be welded, and the end face of the tungsten electrode clamping inner core 11 has a certain distance from the welding seam of the pipe fitting to be welded. The welding torch assembly 1 can adjust and determine the position of the tungsten electrode clamping inner core 11 through the connection of the base 13, the tungsten electrode clamping outer sleeve 12 and the tungsten electrode clamping inner core 11, preferably, when the tungsten electrode clamping inner core 11 is installed in the tungsten electrode clamping outer sleeve 12, the tungsten electrode clamping outer sleeve 11 is screwed to a stop position, and similarly, the tungsten electrode clamping outer sleeve 12 with the tungsten electrode clamping inner core 11 is also screwed to the stop position when being installed in the base 13, so that the position of the tungsten electrode clamping inner core 11 can be effectively fixed and positioned, and meanwhile, the installation position of the clamping device 2 is adjusted, so that the surface height of the end face of the tungsten electrode clamping inner core 11 and the welding seam of the pipe fitting to be welded can be determined.
Preferably, a chamfered surface 121 is provided on the inner circumferential surface of the tungsten electrode holding outer sleeve 12, and the end of the tungsten electrode holding inner core 11 is in contact with the chamfered surface 121. After the tungsten electrode 6 is clamped on the tungsten electrode clamping inner core 11, the end part of the tungsten electrode clamping inner core 11 is extruded and deformed by the structure of the chamfered surface 121 on the inner circumferential surface of the end part of the tungsten electrode clamping outer sleeve 12, the inner hole at the bottom is gradually reduced until the tungsten electrode 6 is clamped, the tungsten electrode is clamped tightly, and therefore the height of the tungsten electrode 6 is calibrated and quantified. The inner side extrusion stress of the tungsten electrode clamping inner core 11 is balanced with the clamping reaction force of the tungsten electrode which is clamped to the outer side, and the tungsten electrode clamping inner core 11 is screwed downwards to a stop position. The tungsten electrode is clamped by the tungsten electrode clamping inner core in a fastening mode, so that the height of the tungsten electrode is solidified and quantified, and voltage fluctuation in the welding process is reduced.
Compared with a manual device, the device for quantitatively controlling the technological parameters of the argon arc spot welding of the pipeline, which is formed by designing and applying a clamping and welding integrated welding torch of a welding system formed by a welding torch component, takes an automatic pipe welding device with the size specification of phi 6mm as an example, the device has the spatial dimension of only 22mmX40mmX73mm, and the occupying space of the device is reduced by nearly 89% compared with the dimension of 40mmX67mmX250mm of the HD750 of pipe welding tongs. The size of the automatic welding device is reduced, the constraints of the pipeline trend, the spatial layout and the spatial position condition of pipeline welding are relaxed, and the flexibility of the pipeline layout of the spacecraft auxiliary power system is improved.
Example 2
As shown in fig. 1 to 10, the embodiment 2 is formed on the basis of the embodiment 1, and the precise positioning of the tungsten electrode height is mainly realized by corresponding tools, specifically:
the accurate positioning of tungsten utmost point height is realized through addding high location frock 3, its high location frock 3 with treat that the pipe diameter of welded tube spare is the same, and the surface mounting of high location frock 3 has height-adjusting piece 31, press from both sides high location frock 3 in clamping part 21, the base 13 that is fixed with tungsten utmost point centre gripping inner core 11 and tungsten utmost point centre gripping overcoat 12 is installed in joint 22, at this moment, there is certain distance in the terminal surface of tungsten utmost point centre gripping inner core 11 apart from the surface of high location frock 3, and the extension line of the axis of tungsten utmost point centre gripping inner core 11 passes height-adjusting piece 31. When the tungsten electrode 6 is positioned in height, the tungsten electrode 6 is placed in the tungsten electrode clamping inner core 11 and is allowed to fall freely, after the tip of the tungsten electrode 6 is attached to the height adjusting sheet 31 on the height positioning tool 3, the welding torch assembly 1 is screwed down, the position of the tungsten electrode 6 is fixed and positioned, after the height positioning tool 6 is disassembled, the pipe fitting to be welded is reinstalled, the height of the tip of the tungsten electrode 6 and the welding seam of the pipe fitting to be welded is the requirement of composite precision control, the height of the tungsten electrode 6 can be determined and positioned through the height positioning tool 3 and the height adjusting sheet 31 arranged on the surface of the height positioning tool, the precision is high, and the surface is simple.
Preferably, the thickness range of the height adjusting sheet 31 is selected to be 0.5-0.7 mm, and preferably, the thickness of the height adjusting sheet 31 is selected to be 0.5mm, so as to realize high-precision control.
Example 3
As shown in fig. 1 to 10, the present embodiment 3 is formed on the basis of the embodiment 2, and the system for quantitatively controlling the process parameters of the argon arc spot welding for the pipeline, which is formed by using the device for quantitatively controlling the process parameters of the argon arc spot welding for the pipeline described in the embodiment 2, further includes an automatic argon arc welding control device 4, an arc welding electrical adaptor 5, and a tungsten electrode 6, wherein a tungsten electrode clamping outer sleeve 12 is connected with the automatic argon arc welding control device 4 through the arc welding electrical adaptor 5, and after the tungsten electrode 6 is clamped in a tungsten electrode clamping inner core 11, a tip of the tungsten electrode 6 extends out of the welding torch assembly 1, specifically, extends out of a peripheral surface of a base 13 and is located on a welding line of a pipe to be welded.
The quantitative control system for the pipeline argon arc spot welding process parameters further comprises a welding line observation tool 7, the welding line observation tool 7 is fixedly connected with the joint part 22 in a detachable connection mode, the welding line observation tool 7 is overlapped with the whole central axis of the welding torch assembly 1, namely after the welding line observation tool 7 is installed in the joint part 22, the central axis of the welding line observation tool 7 is overlapped with the central axis of the tungsten electrode clamping inner core 11 after the welding torch assembly 1 is fixed in the joint part 22.
Installing a welding torch assembly 1 in a joint part 22, placing a tungsten electrode 6 in a tungsten electrode clamping inner core 11, after the tungsten electrode 6 falls freely and the tip of the tungsten electrode 6 is attached to a height adjusting sheet 31 on a height positioning tool 3, screwing the welding torch assembly 1 to position and fix the tungsten electrode 6 in the tungsten electrode clamping inner core 11, removing the welding torch assembly 1 fixed with the tungsten electrode 6 from the joint part 22 by removing a base 13, then installing a welding seam observation tool 7 and fixing the welding seam observation tool 7 in the joint part 22, adjusting a clamping part 21 to enable the welding seam of a pipe fitting to be positioned at the central axis position of the central hole of the welding seam observation tool 7, then fastening the positions of the clamping part 21 and the joint part 22 in the clamping device, screwing the clamping part 21 and the joint part 22 to a stop position by fastening screws and the like, and fixing the relative positions of the clamping part 21 and the joint part 22. Further, after the weld observation tool 7 is removed, the torch assembly 1 with the tungsten electrode 6 mounted and fixed thereon is fixed again in the joint, and at this time, the extension line of the tip of the tungsten electrode 6 is positioned at the center of the weld of the pipe to be welded. After the arc welding electric adapter 5 is connected with the tungsten electrode clamping outer sleeve 12 on the welding torch component 1, the automatic argon arc welding control device 4 is started to perform spot welding on the welding seam of the pipe fitting to be welded. Through the design and application of the electric adapter, the handle of the argon arc welding gun is replaced, the welding space is saved, and the interference of the on-satellite welding structure is avoided.
Preferably, the tip of the tungsten electrode 6 is pretreated such that the taper of the tip of the tungsten electrode 6 is 30 ° or less.
Example 4
As shown in fig. 1 to 11, the present embodiment 4 is a method for quantitatively controlling parameters of a pipeline argon arc spot welding process, which is formed on the basis of the embodiment 3 and is implemented by using the system for quantitatively controlling parameters of the pipeline argon arc spot welding process of the embodiment 3, and comprises the following steps:
step 1, pretreating and pre-assembling a pipe fitting to be welded;
and 5, checking the quality of the formed surface of the welding spot.
Specifically, the structural characteristics of the device and the application description of the method are developed by taking phi 6mm pipeline welding as an embodiment, and the quantitative control method of the argon arc spot welding process parameters comprises the following steps:
step 1: the pretreatment comprises the following steps: mechanically polishing the end surface to be welded of the phi 6mm pipeline, removing oil on the inner wall and the surface of the pipeline, and drying; pre-installing a phi 6mm pipeline cabin section;
step 2: assembling a simulated welding torch, comprising the steps of:
step 2.1, selecting the height positioning tool 3 with the specification consistent with that of the pipe fitting to be welded, installing the height positioning tool 3 in the clamping part 21, and fastening; fixing a steel sheet with the thickness of 0.5mm on the surface of the tungsten electrode height positioning piece through resistance spot welding to realize the quantitative control of the tungsten electrode height;
step 2.2: installing the tungsten electrode clamping sleeve 12 inside the base 13, and screwing the tungsten electrode clamping sleeve 12 to a stop position;
step 2.3: installing the base 13 provided with the tungsten electrode clamping outer sleeve 12 in the clamping part 21, and screwing the base 13 to a stop position;
step 2.4: and (3) loading the tungsten electrode 6 with the processed tip end into a central hole of a tungsten electrode clamping inner core 11, enabling the tip end of the tungsten electrode 6 to be attached to the height positioning tool 3 through free falling of the tungsten electrode, screwing the tungsten electrode clamping inner core 11 to a stop position, and simulating the completion of welding torch installation.
Wherein, the tip shape change of the tungsten electrode 6 needs to use a special tool to polish the tip angle of the tungsten electrode to 30 degrees, thereby avoiding the change of the shape to cause the change of the arc shape, and the stable arc shape ensures the stable heat input.
And step 3: fixing and positioning a pipe fitting to be welded: integrally disassembling the simulation welding torch, installing the joint part 22 at the joint of the pipeline with the diameter of 6mm, installing the welding seam observation tool 7 in the joint part 22, and adjusting the installation position of the joint part 22 through the observation of the welding seam observation tool 7 to ensure that the central axis of an observation hole of the welding seam observation tool 7 passes through the center of a welding seam, so that the tip of a tungsten electrode is aligned with the welding seam in sequence, and the central line of a rotating shaft of the pipeline to be welded is superposed;
welding a welding spot 1: the automatic welding of the pipeline to be welded in the fixed-position welding mode is realized by controlling argon pre-ventilation on the back surface before welding, welding and argon lag ventilation after welding through a program; the flow and time of argon gas introduced to the back are determined according to the size specification and length of the pipeline to be welded, the flow of argon gas is generally 4L/min, and the pre-introducing time is 1-5 min and is determined according to the length and the installation trend of the pipeline; argon arc spot welding parameters: welding current 20A, current duration 0.6s, front side ventilation 30s.
Welding a welding point 2: and (3) disassembling the electric switching part for simulating the welding torch and arc welding, turning and installing as required, and then performing automatic welding by a program, wherein the operation and welding parameters are the same as those of the welding point 1.
And 5, checking the forming surface quality of the welding spot, wherein the forming surface quality of the welding spot meets the I-grade requirement of QJ2865A, the welding spot is bright and is not allowed to be oxidized, and the welding spot has a core and is not allowed to have the defects of cracks, tungsten inclusion and the like.
The invention discloses a pipeline argon arc spot welding process parameter quantitative control method, which is formed by designing and applying a clamping and welding integrated welding torch which is connected with a welding system through a ceramic nozzle, a tungsten electrode, an argon arc welding electricity and gas integrated pipeline, and takes an automatic pipe welding device with the size specification of phi 6mm as an example, the space size of the device is only 22mmX40mmX73mm, and is reduced by nearly 89% compared with the dimension of 40mmX67mmX250mm in the appearance size of a pipe welding tongs HD 750. The size of the automatic welding device is reduced, the constraints of the pipeline trend, the spatial layout and the spatial position condition of pipeline welding are relaxed, and the flexibility of the pipeline layout of the spacecraft auxiliary power system is improved.
In addition, the traditional manual welding is converted into program automatic welding, so that the problems of unstable spot welding quality caused by manual control due to the fact that the welding process depends on human experience, such as tungsten inclusion, too large or too small welding spot size and other defects of uneven spot welding forming, are avoided; the integrated welding torch for clamping and welding and the pipeline to be welded form a closed cavity, so that a good argon protection atmosphere is realized during spot welding.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, are not to be construed as limiting the present application.
The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. A quantitative control device for parameters of a pipeline argon arc spot welding process is characterized by comprising a welding torch component (1) and a clamping device (2);
the welding torch assembly (1) comprises a tungsten electrode clamping inner core (11), a tungsten electrode clamping outer sleeve (12) and a base (13), wherein the tungsten electrode clamping inner core (11), the tungsten electrode clamping outer sleeve (12) and the base (13) are all of a boss type open cylinder structure, and the tungsten electrode clamping inner core (11), the tungsten electrode clamping outer sleeve (12) and the base (13) are sequentially sleeved and connected from inside to outside;
the clamping device (2) is provided with a clamping part (21) and a joint part (22), the pipe fitting to be welded is fixedly positioned through the clamping part (21), the base (13) is connected into the joint part (22), and an extension line of a central axis of the tungsten electrode clamping inner core (11) penetrates through a butt joint seam of the pipe fitting to be welded;
the tungsten electrode clamping device is characterized by further comprising a height positioning tool (3), wherein the height positioning tool (3) is detachably connected into the clamping part (21), a height adjusting sheet (31) is connected to the surface of the height positioning tool (3), and an extension line of a central axis of the tungsten electrode clamping inner core (11) is intersected with the height adjusting sheet (31);
a groove (110) is formed in the outer peripheral surface of the tungsten electrode clamping inner core (11), and the groove (110) is used as a passage of an internal gas circuit of the welding torch assembly (1);
a chamfer surface (121) is arranged on the end surface of the tungsten electrode clamping outer sleeve (12), and the end part of the tungsten electrode clamping inner core (11) is in contact with the chamfer surface (121);
the base (13) is installed and fixed in the joint part (22), the pipe fitting to be welded is clamped and fixed in the clamping part (21), at the moment, the extension line of the central axis of the tungsten electrode clamping inner core (11) penetrates through the welding seam of the pipe fitting to be welded, the extension line of the central axis of the tungsten electrode clamping inner core (11) penetrates through the center of the welding seam of the pipe fitting to be welded, and the end face of the tungsten electrode clamping inner core (11) has a certain distance from the welding seam of the pipe fitting to be welded; the welding torch assembly (1) can adjust and determine the position of the tungsten electrode clamping inner core (11) through the connection of the base (13), the tungsten electrode clamping outer sleeve (12) and the tungsten electrode clamping inner core (11), when the tungsten electrode clamping inner core (11) is installed in the tungsten electrode clamping outer sleeve (12), the tungsten electrode clamping outer sleeve (12) with the tungsten electrode clamping inner core (11) is screwed to a stop position, the tungsten electrode clamping outer sleeve (12) is installed in the base (13) in the same way, the tungsten electrode clamping outer sleeve is also screwed to the stop position, at the moment, the position of the tungsten electrode clamping inner core (11) can be effectively fixed and positioned, and meanwhile, the installation position of the clamping device (2) is adjusted, so that the surface height of the end face of the tungsten electrode clamping inner core (11) and the welding seam of a pipe fitting to be welded can be determined;
after the tungsten electrode (6) is clamped on the tungsten electrode clamping inner core (11), the end part of the tungsten electrode clamping inner core (11) is extruded and deformed by the structure of the chamfered surface (121) on the inner circumferential surface of the end part of the tungsten electrode clamping outer sleeve (12), and the inner hole at the bottom is gradually reduced until the tungsten electrode (6) is clamped, so that the tungsten electrode is firmly clamped, and the height of the tungsten electrode (6) is calibrated and quantized; the inner side extrusion stress borne by the tungsten electrode clamping inner core (11) is balanced with the clamping reaction force of the tungsten electrode clamped to the outer side, and the tungsten electrode clamping inner core (11) is screwed downwards to a stop position; the tungsten electrode is clamped by the tungsten electrode clamping inner core in a fastening mode, so that the height of the tungsten electrode is solidified and quantified, and voltage fluctuation in the welding process is reduced.
2. The quantitative control device for the parameters of the argon arc spot welding process for pipelines according to claim 1, wherein the clamping part (21) comprises a plurality of arc line grooves (210).
3. The quantitative control device for the parameters of the pipeline argon arc spot welding process according to claim 1, wherein the thickness of the height adjusting sheet is 0.5-0.7 mm.
4. A quantitative control system for pipeline argon arc spot welding process parameters is characterized by comprising an automatic argon arc welding control device (4), an arc welding electric adapter (5), a tungsten electrode (6) and the quantitative control device for the pipeline argon arc spot welding process parameters according to any one of claims 1 to 3;
the tungsten electrode clamping outer sleeve (12) is connected with the automatic argon arc welding control device (4) through the arc welding electric adapter (5), and after the tungsten electrode (6) is clamped in the tungsten electrode clamping inner core (11), the tip of the tungsten electrode (6) extends out of the welding torch assembly (1);
the welding line observation tool (7) is further included, and the welding line observation tool (7) is detachably connected with the joint part (22).
5. A quantitative control method for pipeline argon arc spot welding technological parameters is characterized in that the quantitative control system for the pipeline argon arc spot welding technological parameters in claim 4 is adopted, and comprises the following steps:
step 1, pretreating and pre-assembling a pipe fitting to be welded;
step 2, assembling the simulation welding torch: after the welding torch assembly (1) is installed on the joint part (22), the tungsten electrode (6) is installed in the tungsten electrode clamping inner core (11), the connecting position of the tungsten electrode (6) and the welding torch assembly (1) is adjusted and fixed through the height positioning tool (3), and the tungsten electrode (6) and the welding torch assembly (1) are fixed to form a simulation welding torch;
step 3, fixing and positioning the pipe fitting to be welded: the simulated welding torch is disassembled, and the welding seam observation tool (7) is installed at the position of the joint part (22), so that the overlapping degree of the center lines of the rotation axes of the two pipe fittings to be welded is accurately controlled;
step 4, welding the to-be-welded part: disassembling the welding seam observation tool (7), reinstalling and fixing the simulation welding torch on the joint part (22), and then starting the automatic argon arc welding control device (4) to perform spot welding;
and 5, checking the quality of the formed surface of the welding spot.
6. The quantitative control method for the parameters of the pipeline argon arc spot welding process according to claim 5, wherein the step 2 of assembling the simulation welding torch specifically comprises the following steps:
2.1, selecting the height positioning tool (3) with the specification consistent with that of the pipe fitting to be welded, installing the height positioning tool (3) in the clamping part (21), and fastening;
step 2.2: installing the tungsten electrode clamping sleeve (12) inside the base (13), and screwing the tungsten electrode clamping sleeve (12) to a stopping position;
step 2.3: installing the base (13) provided with the tungsten electrode clamping sleeve (12) in the clamping part (21), and screwing the base (13) to a stopping position;
step 2.4: and (3) placing the tungsten electrode (6) with the processed tip end into a central hole of a tungsten electrode clamping inner core (11), enabling the tip end of the tungsten electrode (6) to be tightly attached to the height positioning tool (3) through free falling of the tungsten electrode, screwing the tungsten electrode clamping inner core (11) to a stop position, and simulating the completion of welding torch installation.
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| CN102151964B (en) * | 2011-04-26 | 2013-11-06 | 中广核工程有限公司 | Tungsten electrode argon arc welding gun |
| CN104308334A (en) * | 2014-10-31 | 2015-01-28 | 沈阳黎明航空发动机(集团)有限责任公司 | Welding method of aircraft engine conduit |
| CN104668743B (en) * | 2014-12-25 | 2016-09-07 | 哈尔滨工业大学 | A kind of device utilizing TIG weld method to realize PLASMA ARC WELDING |
| CN108393646B (en) * | 2018-02-12 | 2019-12-17 | 四川省自贡市海川实业有限公司 | Pipe butt angle welding mechanism |
| CN108941959A (en) * | 2018-08-14 | 2018-12-07 | 上海空间推进研究所 | A kind of method of accurate control Φ 3mm stainless steel pipe argonaut welding forming quality |
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