CN111098002B - Multi-electrode welding device and method for metal shielding layer of submarine cable - Google Patents
Multi-electrode welding device and method for metal shielding layer of submarine cable Download PDFInfo
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- 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
- B23K9/1675—Arc welding or cutting making use of shielding gas and of a non-consumable electrode making use of several electrodes
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Abstract
The invention relates to a multi-electrode welding device for a metal shielding layer of a submarine cable, which comprises a mounting disc, a central electrode assembly vertically arranged in the center of the mounting disc and side electrode assemblies distributed in an annular array mode around the central electrode assembly, wherein an electrode deflection angle adjusting mechanism is arranged between each side electrode assembly and the mounting disc, and the side electrode assemblies and the central electrode assembly are identical in structure and are provided with electrode height adjusting upper and lower mechanisms. The invention improves the stability of the electric arc and reduces the risk of welding accidents by the combined work of a plurality of electrode assemblies; the multi-electrode shunting reduces the electrode temperature, reduces the burning loss rate of the tungsten needle, greatly improves the continuous service time of the tungsten needle, improves the productivity, and can prolong the continuous working service life of the electrode by 4-6 times compared with a single-gun welding system; the metallurgical reaction of a molten pool is improved through welding preheating, the quality of a welding seam is improved, and the quality of a submarine cable is ensured. The focusing degree of the multi-electrode assembly can be freely adjusted, and the optimal welding manufacturability is obtained.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a multi-electrode welding device and method for a metal shielding layer of a submarine cable.
Background
The shielding layer of the conventional submarine cable plays roles in resisting signal interference, improving electric field distribution, fastening a structure and the like, and the longitudinal joint connection mode after the metal shielding layer is formed is generally TIG welding. The forming and welding mode of the common metal shielding layer in the field of submarine cables is as follows: after a metal belt is longitudinally wrapped and formed, welding is carried out in a single electrode wire-filling-free Tig welding mode, the welding is limited by a welding method, the electrode continuously discharges under the action of current, a tungsten needle electrode is always in a high-temperature state, the needle head is easy to ablate after being used for a long time, further electric arc dispersion is caused, welding energy is not concentrated, the problem of insufficient heat source and the like is solved, welding accidents such as incomplete fusion, insufficient welding, welding leakage and the like can be caused, rework and repair cost is increased, product performance is influenced, and more serious conditions exist, poor welding length exceeds a repair range, so that the whole cable is invalid and scrapped, and loss is extremely high. In addition, the electrode is prone to be in a bad state, and the electrode is frequently stopped and replaced with a new electrode to ensure qualified welding quality, so that production efficiency is low, and productivity is affected.
The traditional single electrode Tig welding belongs to one of fusion welding, and the welding quality and the continuous welding time of the traditional single electrode Tig welding are greatly influenced by the condition of a single-beam electric arc. Has the following defects: firstly, the single electrode welding system has poor stability and poor tolerance of adverse factors: once unstable factors such as welding material dirt, needle point ablation and peeling occur, the quality of the electric arc is obviously affected, and the adverse effects on the product quality such as cold joint, incomplete fusion, missing welding and the like are often generated, so that the hidden dangers of direct economic loss and product failure are brought. Secondly, single electrode welding, the current carrying capacity is limited: with the increase of linear speed, the load current of the tungsten needle is increased, the temperature is increased, the burning loss of the tungsten needle is accelerated, the arc instability is caused, and the stable use time of the electrode is further influenced, so the continuous welding time of single-electrode TIG welding is often very short. And thirdly, metallurgical reaction of the welding seam of the single electrode welding is insufficient, and the quality of the welding seam is not high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-electrode welding device and method for a metal shielding layer of a submarine cable.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a sea cable metal shielding layer multielectrode welding set, include the mounting disc, vertically set up in central electrode subassembly at mounting disc center, wind the side electrode subassembly that central electrode subassembly annular array distributes, side electrode subassembly with be equipped with electrode declination guiding mechanism between the mounting disc, side electrode subassembly with central electrode subassembly structure is the same and all is equipped with electrode altitude mixture control upper and lower mechanism.
In the design, a plurality of electrode assemblies work together to improve the stability of the electric arc and reduce the risk of welding accidents; multi-electrode shunting is adopted, so that the electrode temperature is reduced, the burning loss rate of the tungsten needle is reduced, the continuous service time of the tungsten needle is greatly prolonged, and the productivity is improved; the metallurgical reaction of a molten pool is improved through welding preheating, the quality of a welding seam is improved, and the quality of a submarine cable is ensured. The focusing degree of the multi-electrode assembly can be freely adjusted, and the optimal welding manufacturability is obtained.
As a further improvement of the present design, the mounting plate is provided with electrode mounting holes penetrating through the mounting plate, the electrode mounting holes include a central mounting hole vertically penetrating through the center of the mounting plate and side mounting holes distributed around the central mounting hole in an annular array, the side mounting holes extend from the outside of the top of the mounting plate to the center of the bottom of the mounting plate, the side electrode assemblies are disposed in the side mounting holes, the central electrode assemblies are disposed in the central mounting holes, each of the side electrode assemblies and the central electrode assemblies includes an outer sleeve, an inner sleeve inserted into the outer sleeve and in threaded connection with the outer sleeve, and an electrode tube inserted into the inner sleeve, the outer diameter of the outer sleeve is smaller than the inner diameter of the side mounting hole, the electrode declination adjustment mechanism includes a flexible connector filled between the top of the side mounting hole and the outer sleeve of the side electrode assembly, The adjusting bolt is arranged on the side face of the mounting disc and in threaded connection with the mounting disc, the head of the adjusting bolt abuts against the side face of an outer sleeve of the side electrode assembly, the axis of the adjusting bolt points to the axis of the central electrode assembly and is coplanar, the outer sleeve of the central electrode assembly faces towards one side of the central electrode assembly and a reset elastic piece is arranged between the mounting disc and the upper mechanism for adjusting the electrode height comprises a height adjusting knob fixedly connected with the inner sleeve. The adjusting mechanism is simple, the adjusting freedom degree is large, and the focusing point can be controlled accurately.
As a further improvement of the design, the top of the inner sleeve is in threaded connection with a threaded metal sleeve, and the threaded metal sleeve is fixedly connected and electrically connected with the electrode tube, so that the electrode can be conveniently installed.
As a further improvement of the design, the threaded metal sleeve is externally sleeved with an insulating wooden plug, and the threaded metal sleeve and the electrode tube are both made of copper. The wooden plug is convenient for the external insulation of the threaded metal sleeve. The copper thread metal sleeve and the electrode tube have good conductivity.
As a further improvement of the design, the reset elastic piece is positioned at the top of the side mounting hole, so that the reset of the side electrode assembly is facilitated.
As a further improvement of the present design, two of the side electrode assemblies are provided on each of the mounting disks.
As a further improvement of the design, the bottom of the mounting disc is provided with a cooling circulation water gap and a protection gas port, so that the cooling circulation water gap and the protection gas port are convenient to integrate, the size is small, the welding quality is improved, and the welding equipment is protected.
Utilize above-mentioned device to provide a sea cable metal shielding layer multi-electrode welding, include the following step:
s1, welding preparation: preparing for gas exhaust of protective gas in a welding area, performing spot inspection on cooling water in a welding gun area, installing a tungsten electrode and confirming a gap, adjusting the heights of a central electrode assembly and a side electrode assembly, and adjusting the inclination angle of the side electrode assembly;
s2: welding starting and accelerating: starting welding water cooling, gas protection and the like, starting welding, discharging the tip of the central electrode assembly, ionizing air, forming electric arcs, fusing welding seams, and starting welding; increasing the speed of a metal pipeline, increasing the welding current to a starting current of a side electrode assembly, pausing the quick acceleration of the metal pipeline, keeping the total current unchanged, starting the side electrode assembly, discharging and striking the arc of the started side electrode assembly, reducing the welding current of a central electrode assembly after the arc striking of the started side electrode assembly is successful, and synchronously increasing the welding current of the started side electrode assembly at the same time until the welding current of the central electrode assembly is equal to that of the started side electrode assembly, and then completely starting the started side electrode assembly; the speed of the metal pipeline is increased continuously, after the current of the central electrode assembly and the current of the started side electrode assembly are synchronously increased to a total current reaching the starting current of a second started side electrode assembly, the speed acceleration of the metal pipeline is suspended, the total current is kept unchanged, the second side electrode assembly is started, the second side electrode assembly discharges and starts arc, after the arc starting of the second side electrode assembly is successful, the current of the central electrode assembly and the current of the first started side electrode assembly are synchronously reduced, meanwhile, the welding current of the second side electrode assembly is increased until the currents of the three electrode assemblies are equal, and the second side electrode assembly is completely started; the current of the three electrode assemblies continuously increases at a constant speed along with the continuous increase of the speed of the metal pipeline until the linear speed reaches a set speed, the linear speed is stable, and the total current is unchanged;
s3: and (3) welding deceleration: when the speed of the metal pipeline is reduced to the starting current of the second side electrode assembly, a second side electrode assembly extinguishing prompt is triggered, at the moment, the speed reduction of the metal pipeline is suspended, the linear speed is stable, the control button is clicked to execute a second side electrode assembly extinguishing instruction, the current of the second side electrode assembly is continuously reduced, meanwhile, the current reduced by the second side electrode assembly is averagely distributed to the center electrode assembly and the first side electrode assembly until the current of the second side electrode assembly is reduced to 0, and after the current of the second side electrode assembly is equally distributed to the center electrode assembly and the first side electrode assembly, the second side electrode assembly is extinguished, and the first-stage speed reduction is completed. And then, the speed of the metal pipeline is continuously reduced, the currents of the central electrode assembly and the first side electrode assembly are synchronously and uniformly reduced until the total current reaches the starting current of the first side electrode assembly, a first side electrode assembly extinguishing prompt is triggered, the speed of the metal pipeline is suspended and reduced, the linear speed is kept stable, a first side electrode assembly extinguishing instruction is clicked to be executed, the current of the first side electrode assembly is reduced to 0 current, meanwhile, the current of the central electrode assembly is synchronously increased until the current of the first side electrode assembly returns to 0, the first side electrode assembly is quenched, and the second-stage speed reduction is completed. Thereafter, the center electrode assembly alone can achieve the lowest line speed requirement. At the moment, a stop button is clicked, the current of the central electrode assembly is gradually reduced along with the reduction of the speed of the metal pipeline, and the central electrode assembly is extinguished when the speed of the metal pipeline stops, so that the third-stage speed reduction is completed;
s4, shutdown process: and under the working state of any number of electrodes, starting a complete machine stop command, reducing the current of all the electrode assemblies simultaneously and matching the current with the linear speed until the linear speed returns to 0, and extinguishing the plurality of electrode assemblies simultaneously.
The speed, the current and the time of the welding system in the speed increasing and decreasing and stopping stages are controlled reasonably, and the welding quality can be ensured. The welding device is suitable for long-length continuous welding, and the length of the continuous welding can reach more than 40 km; the total welding current is increased, and the high-speed welding requirement is met.
The invention has the beneficial effects that: the invention improves the stability of the electric arc and reduces the risk of welding accidents by the combined work of a plurality of electrode assemblies; the multi-electrode shunting reduces the electrode temperature, reduces the burning loss rate of the tungsten needle, greatly improves the continuous service time of the tungsten needle, improves the productivity, and can prolong the continuous working service life of the electrode by 4-6 times compared with a single-gun welding system; the metallurgical reaction of a molten pool is improved through welding preheating, the quality of a welding seam is improved, and the quality of a submarine cable is ensured. The focusing degree of the multi-electrode assembly can be freely adjusted, and the optimal welding manufacturability is obtained.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is an overall sectional structure diagram of the present invention.
Fig. 2 is a schematic longitudinal sectional view of a center electrode assembly according to the present invention.
Fig. 3 is a schematic view of the elastic connection mechanism of the side electrode assembly of the present invention.
Fig. 4 is a graphical representation of the welding speed versus time for three electrode assemblies of the present invention.
Fig. 5 is a schematic diagram of the operation of the present invention.
In the figure, 1, a mounting disc, 2, a protective air port, 3, a side mounting hole, 4, an adjusting bolt, 5, a center mounting hole, 6, a center electrode assembly, 7, a side electrode assembly, 8, a reset elastic piece, 9, an insulating wood plug, 10, a threaded metal sleeve, 11, a height adjusting knob, 12, a cooling circulating water port, 13, an electrode tube, 14, an outer sleeve, 15, an inner sleeve and 16, a flexible connector are arranged.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.
Example (b): the utility model provides a sea cable metal shielding layer multielectrode welding set, include mounting disc 1, vertical set up in central electrode subassembly 6 at mounting disc 1 center, wind the side electrode subassembly 7 that 6 annular array of central electrode subassembly distribute, side electrode subassembly 7 with be equipped with electrode declination guiding mechanism between the mounting disc 1, side electrode subassembly 7 with central electrode subassembly 6 the same and all be equipped with electrode height control upper and lower mechanism of structure.
In the design, a plurality of electrode assemblies work together to improve the stability of the electric arc and reduce the risk of welding accidents; multi-electrode shunting is adopted, so that the electrode temperature is reduced, the burning loss rate of the tungsten needle is reduced, the continuous service time of the tungsten needle is greatly prolonged, and the productivity is improved; the metallurgical reaction of a molten pool is improved through welding preheating, the quality of a welding seam is improved, and the quality of a submarine cable is ensured. The focusing degree of the multi-electrode assembly can be freely adjusted, and the optimal welding manufacturability is obtained.
As a further improvement of the present design, the mounting plate 1 is provided with electrode mounting holes penetrating through the mounting plate 1, the electrode mounting holes include a central mounting hole 5 vertically penetrating through the center of the mounting plate 1 and side mounting holes 3 distributed around the central mounting hole 5 in an annular array, the side mounting holes 3 extend from the outside of the top of the mounting plate 1 to the center of the bottom of the mounting plate 1, the side electrode assemblies 7 are disposed in the side mounting holes 3, the central electrode assemblies 6 are disposed in the central mounting holes 5, each of the side electrode assemblies 7 and the central electrode assemblies 6 includes an outer sleeve 14, an inner sleeve 15 inserted into the outer sleeve 14 and in threaded connection with the outer sleeve 14, and an electrode tube 13 inserted into the inner sleeve 15, the outer diameter of the outer sleeve 14 is smaller than the inner diameter of the side mounting hole 3, and the electrode deflection angle adjusting mechanism includes a flexible tube filled between the top of the side mounting hole 3 and the outer sleeve 14 of the side electrode assembly 7 The electrode height adjusting mechanism comprises a sexual connector 16 and an adjusting bolt 4 arranged on the side face of the mounting disc 1, wherein the adjusting bolt 4 is in threaded connection with the mounting disc 1, the head of the adjusting bolt 4 abuts against the side face of an outer sleeve 14 of the side electrode assembly 7, the axis of the adjusting bolt 4 points to the axis and the coplane of the center electrode assembly 6, the outer sleeve 14 of the center electrode assembly 6 faces towards one side of the center electrode assembly 6 and a reset elastic piece 8 is arranged between the mounting disc 1, and the electrode height adjusting upper and lower mechanism comprises a height adjusting knob 11 fixedly connected with an inner sleeve 15. The adjusting mechanism is simple, the adjusting freedom degree is large, and the focusing point can be controlled accurately.
As a further improvement of the design, the top of the inner sleeve 15 is connected with a threaded metal sleeve 10 in a threaded manner, and the threaded metal sleeve 10 is fixedly connected and electrically connected with the electrode tube 13, so that the electrode can be conveniently installed.
As a further improvement of the design, the threaded metal sleeve 10 is externally sleeved with an insulating wooden plug 9, and the threaded metal sleeve 10 and the electrode tube 13 are both made of copper. The insulating wooden plug facilitates the external insulation of the threaded metal sleeve 10. The copper threaded metal sleeve 10 and the electrode tube 13 have good electrical conductivity.
As a further improvement of the present design, the return elastic member 8 is located at the top of the side mounting hole 3, facilitating the return of the side electrode assembly 7.
As a further improvement of the present design, two of the side electrode assemblies 7 are provided on each of the mounting disks 1.
As the further improvement of the design, the bottom of the mounting disc 1 is provided with the cooling circulation water gap 12 and the protection gas port 2, so that the integration of the cooling circulation water gap 12 and the protection gas port 2 is facilitated, the size is small, the welding quality is improved, and the welding equipment is protected.
Utilize above-mentioned device to provide a sea cable metal shielding layer multi-electrode welding, include the following step:
s1, welding preparation: preparing for gas exhaust of protective gas in a welding area, checking cooling water in a welding gun area, installing a tungsten electrode and confirming a gap, adjusting the heights of a central electrode assembly 6 and a side electrode assembly 7, and adjusting the inclination angle of the side electrode assembly 7;
s2: welding starting and accelerating: starting welding water cooling, gas protection and the like, starting welding, discharging the tip of the central electrode assembly 6, ionizing air, forming electric arcs, fusing welding seams, and starting welding; increasing the speed of the metal pipeline, increasing the welding current to a starting current of a side electrode assembly 7, pausing the acceleration of the metal pipeline, keeping the total current unchanged, starting the side electrode assembly 7, discharging and striking the arc of the started side electrode assembly 7, reducing the welding current of the central electrode assembly 6 after the striking of the started side electrode assembly 7 is successful, and simultaneously increasing the welding current of the started side electrode assembly 7 synchronously until the welding current of the central electrode assembly 6 is equal to that of the started side electrode assembly 7, and completely starting the started side electrode assembly 7; the increase of the metal pipeline speed is continued, after the current of the central electrode assembly 6 and the current of the started side electrode assembly 7 are synchronously increased to the total current to reach the starting current of the second started side electrode assembly 7, the metal pipeline speed acceleration is suspended, the total current is kept unchanged, the second side electrode assembly 7 is started, the second side electrode assembly 7 discharges and starts arc, after the arc starting of the second side electrode assembly 7 is successful, the current of the central electrode assembly 6 and the current of the first started side electrode assembly 7 are synchronously reduced, meanwhile, the welding current of the second side electrode assembly 7 is increased, and after the currents of the three electrode assemblies are equal, the second side electrode assembly 7 is completely started; the current of the three electrode assemblies continuously increases at a constant speed along with the continuous increase of the speed of the metal pipeline until the linear speed reaches a set speed, the linear speed is stable, and the total current is unchanged;
s3: and (3) welding deceleration: when the speed of the metal pipeline is reduced to the starting current of the second side electrode assembly 7, the extinguishing prompt of the second side electrode assembly 7 is triggered, at the moment, the deceleration of the metal pipeline is suspended, the linear speed is stable, the control button is clicked to execute the extinguishing command of the second side electrode assembly 7, the current of the second side electrode assembly 7 is continuously reduced, meanwhile, the reduced current of the second side electrode assembly 7 is averagely distributed to the center electrode assembly 6 and the first side electrode assembly 7 until the current of the second side electrode assembly 7 is reduced to 0, and after the current of the second side electrode assembly 7 is averagely distributed to the center electrode assembly 6 and the first side electrode assembly 7, the second side electrode assembly 7 is extinguished, and the first-stage deceleration is completed. Then, the speed of the metal pipeline is continuously reduced, the currents of the central electrode assembly 6 and the first side electrode assembly 7 are synchronously and uniformly reduced until the total current reaches the starting current of the first side electrode assembly 7, the extinguishing prompt of the first side electrode assembly 7 is triggered, the speed of the metal pipeline is temporarily stopped and reduced, the linear speed is kept stable, the extinguishing command of the first side electrode assembly 7 is clicked to be executed, the current of the first side electrode assembly 7 is reduced to 0 current, meanwhile, the current of the central electrode assembly 6 is synchronously increased until the current of the first side electrode assembly 7 returns to 0, the first side electrode assembly 7 is extinguished, and the second-stage speed reduction is completed. Thereafter, the center electrode assembly 6 alone can achieve the lowest line speed requirement. At the moment, a stop button is clicked, the current of the central electrode assembly 6 is gradually reduced along with the reduction of the linear speed of the metal pipe, and the central electrode assembly 6 is extinguished when the linear speed of the metal pipe is stopped, so that the third-stage speed reduction is completed;
s4, shutdown process: and under the working state of any number of electrodes, starting a complete machine stop command, reducing the current of all the electrode assemblies simultaneously and matching the current with the linear speed until the linear speed returns to 0, and extinguishing the plurality of electrode assemblies simultaneously.
The speed, the current and the time of the welding system in the speed increasing and decreasing and stopping stages are controlled reasonably, and the welding quality can be ensured. The welding device is suitable for long-length continuous welding, and the length of the continuous welding can reach more than 40 km; the total welding current is increased, and the high-speed welding requirement is met.
Specifically, taking a welding device with a center electrode assembly 6 and two side electrode assemblies 7 as an example, starting arc striking of the center electrode assembly 6 at a point a, gradually increasing welding speed at a section AB, starting current of the first side electrode assembly 7 when the speed reaches a point B, pausing the increase of the welding speed, and after the first side electrode assembly 7 is started, gradually equalizing the currents of the center electrode assembly 6 and the first side electrode assembly 7 at a section BC until the first side electrode assembly 7 is completely started at a point C, so that the welding currents of the center electrode assembly 6 and the first side electrode assembly 7 are equalized. CD section: the welding speed increases and as the total current increases, the current in the center electrode assembly 6 and the first side electrode assembly 7 increases equally. And (3) when the point D reaches the starting current of the second side electrode assembly 7, after the second side electrode assembly 7 is started, the currents of the DE section central electrode assembly 6 and the first side electrode assembly 7 are uniformly reduced, the current of the second side electrode assembly 7 is increased until the welding currents of the central electrode assembly 6, the first side electrode assembly 7 and the second side electrode assembly 7 are equal at the point E, and the starting process of the second side electrode assembly 7 is finished. To this end, the central electrode assembly 6, the first side electrode assembly 7 and the second side electrode assembly 7 are all activated, and the process is repeated until all the N electrodes are activated (this schematic diagram is exemplified by three electrodes). The EF section is the acceleration process of three electrodes (N electrodes) in the simultaneous working state to the maximum welding speed set value, namely the FG section.
After the point G, the speed reduction stage, the electrode stop welding process, and the GH stage, the three-electrode current is simultaneously reduced until the total current (the sum of the N electrode currents) reaches the activation current of the second side electrode assembly 7 (the activation and extinction currents of the nth electrode are equal, which is not distinguished here, i.e., the extinction current of the second side electrode assembly 7) H point corresponding to the current, at which time, a command for extinguishing the second side electrode assembly 7 is executed, and the HI stage, the second side electrode assembly 7 current is reduced, the central electrode assembly 6 and the first side electrode assembly 7 welding current are increased (the current reduced by the second side electrode assembly 7 is averaged), until the point I reduces the second side electrode assembly 7 welding current to 0, the second side electrode assembly 7 arcing is completed, that is, the central electrode assembly 6 and the first side electrode assembly 7 share the second side electrode assembly 7 current equally. The IJ stage is a deceleration process in a state where only the center electrode assembly 6 and the first side electrode assembly 7 are simultaneously operated, when the linear speed is reduced to a point J, the total current is reduced to the starting current of the first side electrode assembly 7, after a first side electrode assembly 7 extinguishing instruction is executed, the welding current of the first side electrode assembly 7 is reduced in the JK stage, the welding current of the center electrode assembly 6 is synchronously increased at the same time, the current of the first side electrode assembly 7 is reduced to 0 at the point K, arc extinguishing is completed, and the center electrode assembly 6 undertakes the completion of the current of the first side electrode assembly 7. And executing a stop command at the point K, gradually reducing the linear speed to 0 at the KL stage, reducing the welding current of the central electrode assembly 6 along with the reduction of the linear speed, and extinguishing the arc of the central electrode assembly 6 when the linear speed is 0.
Thus, the processes of starting the acceleration electrode and stopping the arc in the deceleration of the three electrodes (N electrodes) are completed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for performing multi-electrode welding on a submarine cable metal shielding layer by using a multi-electrode welding device is characterized in that the multi-electrode welding device comprises a mounting disc, a central electrode assembly vertically arranged at the center of the mounting disc and side electrode assemblies distributed around the central electrode assembly in an annular array, an electrode deflection angle adjusting mechanism is arranged between the side electrode assemblies and the mounting disc, the side electrode assemblies and the central electrode assembly are identical in structure and are respectively provided with an electrode height adjusting upper mechanism and an electrode height adjusting lower mechanism, electrode mounting holes penetrating through the mounting disc are formed in the mounting disc, the electrode mounting holes comprise a central mounting hole vertically penetrating through the center of the mounting disc and side mounting holes distributed around the central mounting hole in an annular array, the side mounting holes extend from the outer side of the top of the mounting disc to the center of the bottom of the mounting disc, and the side electrode assemblies are arranged in the side mounting holes, the central electrode assembly is arranged in the central mounting hole, the side electrode assembly and the central electrode assembly respectively comprise an outer sleeve, an inner sleeve inserted into the outer sleeve and in threaded connection with the outer sleeve, and an electrode tube inserted into the inner sleeve, the outer diameter of the outer sleeve is smaller than the inner diameter of the side mounting hole, the electrode deflection angle adjusting mechanism comprises a flexible connector filled between the top of the side mounting hole and the outer sleeve of the side electrode assembly, and an adjusting bolt arranged on the side face of the mounting disc, the adjusting bolt is in threaded connection with the mounting disc, the head of the adjusting bolt abuts against the side face of the outer sleeve of the side electrode assembly, the axis of the adjusting bolt points to the axis of the central electrode assembly and is coplanar, and a reset elastic piece is arranged between one side of the outer sleeve of the central electrode assembly facing the central electrode assembly and the mounting disc, the electrode height adjusting up-down mechanism comprises a height adjusting knob fixedly connected with the inner sleeve, the top of the inner sleeve is in threaded connection with a threaded metal sleeve, the threaded metal sleeve is fixedly connected and electrically connected with the electrode tube, and the bottom of the mounting disc is provided with a cooling circulating water port and a protective gas port;
the method for welding the metal shielding layer of the submarine cable by using the multi-electrode welding device comprises the following steps:
s1, welding preparation: preparing for gas exhaust of protective gas in a welding area, performing spot inspection on cooling water in a welding gun area, installing a tungsten electrode and confirming a gap, adjusting the heights of a central electrode assembly and a side electrode assembly, and adjusting the inclination angle of the side electrode assembly;
s2: welding starting and accelerating: starting welding water cooling, gas protection, starting welding, discharging the tip of the central electrode assembly, ionizing air to form electric arcs, fusing welding seams, and starting welding; increasing the speed of a metal pipeline, increasing the welding current to a starting current of a side electrode assembly, pausing the quick acceleration of the metal pipeline, keeping the total current unchanged, starting the side electrode assembly, discharging and striking the arc of the started side electrode assembly, reducing the welding current of a central electrode assembly after the arc striking of the started side electrode assembly is successful, and synchronously increasing the welding current of the started side electrode assembly at the same time until the welding current of the central electrode assembly is equal to that of the started side electrode assembly, and then completely starting the started side electrode assembly; the speed of the metal pipeline is continuously increased, after the current of the central electrode assembly and the current of the started side electrode assembly are synchronously increased to the total current to reach the starting current of the second started side electrode assembly, the speed acceleration of the metal pipeline is suspended, the total current is kept unchanged, the second side electrode assembly is started, the second side electrode assembly discharges and starts arcs, after the arc starting of the second side electrode assembly is successful, the current of the central electrode assembly and the current of the first started side electrode assembly are synchronously reduced, meanwhile, the welding current of the second side electrode assembly is increased, and after the currents of the three electrode assemblies are equal, the second side electrode assembly is completely started; the current of the three electrode assemblies continuously increases at a constant speed along with the continuous increase of the speed of the metal pipeline until the linear speed reaches a set speed, the linear speed is stable, and the total current is unchanged;
s3: and (3) welding deceleration: when the speed of the metal pipeline is reduced to the starting current of the second side electrode assembly, a second side electrode assembly extinguishing prompt is triggered, at the moment, the deceleration of the metal pipeline is suspended, the linear speed is stable, a control button is clicked to execute a second side electrode assembly extinguishing instruction, the current of the second side electrode assembly is continuously reduced, meanwhile, the current reduced by the second side electrode assembly is averagely distributed to the center electrode assembly and the first side electrode assembly until the current of the second side electrode assembly is reduced to 0, and after the current of the second side electrode assembly is equally distributed to the center electrode assembly and the first side electrode assembly, the second side electrode assembly is extinguished, and the first-stage deceleration is finished; then, the speed of the metal pipeline is continuously reduced, the currents of the central electrode assembly and the first side electrode assembly are synchronously and uniformly reduced until the total current reaches the starting current of the first side electrode assembly, a first side electrode assembly extinguishing prompt is triggered, the speed of the metal pipeline is suspended and reduced, the linear speed is maintained to be stable, a first side electrode assembly extinguishing instruction is clicked to be executed, the current of the first side electrode assembly is reduced to 0 current, meanwhile, the current of the central electrode assembly is synchronously increased until the current of the first side electrode assembly returns to 0, the first side electrode assembly is quenched, and the second-stage speed reduction is completed; thereafter, when the central electrode assembly works independently, the requirement of the lowest linear speed can be met; at the moment, a stop button is clicked, the current of the central electrode assembly is gradually reduced along with the reduction of the speed of the metal pipeline, and the central electrode assembly is extinguished when the speed of the metal pipeline stops, so that the third-stage speed reduction is completed;
s4, shutdown process: and under the working state of any number of electrodes, starting a complete machine stop command, reducing the current of all the electrode assemblies simultaneously and matching the current with the linear speed until the linear speed returns to 0, and extinguishing the plurality of electrode assemblies simultaneously.
2. The method as claimed in claim 1, wherein the threaded metal sheath is covered with an insulating wooden plug, and the threaded metal sheath are both made of copper.
3. The method of claim 1, wherein the resilient return member is positioned at the top of the side mounting hole.
4. The method of claim 1, wherein two of said side electrode assemblies are provided on each of said mounting plates.
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Address after: Building 2, No.8, Tongda Road, Changshu Economic and Technological Development Zone, Suzhou City, Jiangsu Province, 215000 Patentee after: Jiangsu Hengtong Huahai Technology Co.,Ltd. Country or region after: China Address before: Building 2, No.8, Tongda Road, Changshu Economic and Technological Development Zone, Suzhou City, Jiangsu Province, 215000 Patentee before: JIANGSU HENGTONG MARINE CABLE SYSTEMS Co.,Ltd. Country or region before: China |