CN112775521A

CN112775521A - Double-gun mechanized gas shield transverse welding method

Info

Publication number: CN112775521A
Application number: CN202011529710.5A
Authority: CN
Inventors: 沈楠楠; 张利明; 程晋宜; 王金源; 温志刚; 田雷; 靳伟亮; 杨建�; 张剑利; 赵阳
Original assignee: Offshore Oil Engineering Co Ltd; Offshore Oil Engineering Qingdao Co Ltd
Current assignee: Offshore Oil Engineering Co Ltd; Offshore Oil Engineering Qingdao Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-05-11

Abstract

The invention discloses a double-gun mechanized gas shield transverse welding method, which comprises the following steps: s1, processing a groove, namely processing a first side of the groove into a first slope, and then processing a second side of the groove into a second slope; s2, assembling and debugging the double-gun welding device, installing the double-gun welding device on the welding base metal, and debugging the double-gun welding device before welding; s3, preparing before welding, and adjusting the root gap of the groove to 2-4 mm; s4, backing welding, wherein a single-layer single-pass welding mode is adopted during welding; s5, filling single-gun gas shielded welding, wherein a single-pass welding mode is adopted during welding; s6, welding by a double-gun welding device, wherein a multi-layer and multi-pass welding mode is adopted during welding; and S7, welding the cover surface by single-gun gas shield, wherein a multi-pass welding mode is adopted during welding. According to the invention, groove processing is combined with four welding processes, and the third welding process is carried out by using a double-gun welding device, so that the welding quality and the welding efficiency are greatly improved, and the labor is saved.

Description

Double-gun mechanized gas shield transverse welding method

Technical Field

The invention relates to the field of gas shielded horizontal welding, in particular to a double-gun mechanical gas shielded horizontal welding method.

Background

In the manufacturing process of offshore oil platforms and jackets, the gas shield welding process is the most widely applied welding process with the largest welding material consumption, and roughly counted, the gas shield welding process accounts for about 50% of the construction workload of the jackets, about 75% of the construction workload of the blocks and about 85% of the construction workload of the FPSO modules, and is the most main welding process in the steel structure prefabrication and final assembly stages, so the construction efficiency of the gas shield welding process has great influence on the overall construction progress of the engineering.

At present, the prefabricated assembly welding of ocean engineering steel construction mainly adopts semi-automatic gas shield welding, and although welding efficiency has been greatly promoted for the hand (hold) welding, in the face of the increasing of work load, its welding quality is relatively poor, and welding efficiency is also lower, and the manpower that just needs is also more.

Disclosure of Invention

The invention aims to solve the technical problem of how to provide a double-gun mechanical gas shield transverse welding method so as to solve the problems of poor welding quality, low welding efficiency and more required manpower of semi-automatic gas shield welding.

In order to solve the technical problem, the invention provides a double-gun mechanized gas shield transverse welding method, which comprises the following steps: s1, processing a groove, namely processing a first side of the groove into a first slope, and then processing a second side of the groove into a second slope; the included angle between the first slope and the reference surface is 12.5 degrees to 17.5 degrees, the included angle between the second slope and the reference surface is 27.5 degrees to 32.5 degrees, and the reference surface is a plane perpendicular to the welding base metal.

And S2, assembling and debugging the double-gun welding device, namely, firstly installing the double-gun welding device on the welding parent metal, and then debugging the double-gun welding device before welding.

S3, preparing before welding, firstly adjusting the root clearance of the groove to 2-4 mm, then grinding the two sides of the groove, and finally preheating the two sides of the groove.

And S4, backing welding, namely backing welding the groove by using hand welding, wherein a single-layer single-pass welding mode is adopted during welding.

And S5, filling by single-gun gas shielded welding, and carrying out second welding on the groove subjected to backing welding by using the single-gun gas shielded welding, wherein a single-welding mode is adopted during welding.

S6, welding by using a double-gun welding device, and performing third welding on the groove after the second welding by using the double-gun welding device, wherein a multi-layer multi-pass welding mode is adopted during welding.

S7, single-gun gas shielded welding cover surface, and performing cover surface welding on the groove after the third welding by using single-gun gas shielded welding, wherein a multi-pass welding mode is adopted during welding.

Furthermore, in the step S1, an included angle between the first slope and the reference plane in the groove machining is 15 degrees, and an included angle between the second slope and the reference plane is 30 degrees.

Furthermore, in the step S1, 1 mm to 2 mm truncated edges are reserved at the roots of the first side and the second side of the groove in the groove machining.

Further, the S2, the twin gun welding apparatus in assembling and commissioning of the twin gun welding apparatus, includes: a magnetic cutting machine traveling mechanism; the two welding gun adjusting devices are respectively arranged on two sides of the travelling mechanism of the magnetic cutting machine; the two semi-automatic gas shield welding guns are respectively arranged on the two welding gun adjusting devices; the track running mechanism connecting device is arranged on one side of the magnetic cutting machine running mechanism and is in sliding connection with the flexible track.

Further, in the step S3, when preheating is performed on both sides of the groove in the preparation before welding, specifically, preheating is performed on the side walls of which the distance between both sides of the groove is less than 75 mm.

Further, the welding parameters in the backing welding of step S4 are set to 80 to 100 amperes of welding current, 20 to 22 volts of welding voltage, 40 to 60 millimeters per minute of welding speed, and 2.5 kilojoules per millimeter of maximum heat input.

Further, in step S5, the welding parameters in the one-gun gas-shielded welding filling are 230 to 260 amperes of welding current, 24 to 26 volts of welding voltage, 260 to 300 millimeters per minute of welding speed, and 1.8 kilojoules per millimeter of maximum heat input.

Further, in step S6, the welding parameters in the welding of the twin gun welding device are welding current 220 to 250 amperes, welding voltage 23 to 26 volts, welding speed 270 to 300 millimeters per minute, and maximum heat input 1.5 kilojoules per millimeter.

Further, in step S7, the welding parameters in the single-gun gas-shielded welding cover face are welding current 210 ampere to 220 ampere, welding voltage 23 volt to 24 volt, welding speed 300 mm per minute to 350 mm per minute, and maximum heat input 1.2 kilojoules per mm.

Further, the welding shielding gas in the step S4, backing welding, the step S5, single gun gas shielded welding filling, the step S6, the welding with the double gun welding device, and the step S7, the single gun gas shielded welding cover face is carbon dioxide, and the purity of the carbon dioxide is 99.8 percent.

According to the invention, groove processing is combined with four welding processes, and the third welding process is carried out by using a double-gun welding device, so that the welding quality and the welding efficiency are greatly improved, and the labor is saved.

Drawings

Fig. 1 is an overall flow schematic of a double-gun mechanized gas shield horizontal welding method according to an embodiment of the present invention.

Fig. 2 is a schematic overall structural diagram of a double-gun welding device in a double-gun mechanized gas shield horizontal welding method according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a welding gun adjusting device of a double-gun welding device in a double-gun mechanized gas shield horizontal welding method according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a rail traveling mechanism connecting device of a double-gun welding device in a double-gun mechanized gas shield transverse welding method according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a base in a mechanized gas shield welding device capable of achieving double-gun welding according to an embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a welding parent metal in a double-gun mechanized gas shield horizontal welding method according to an embodiment of the present invention.

Wherein, 1, a magnetic cutting machine walking mechanism; 2. a welding gun adjusting device; 21. an upper and lower screw adjuster; 211. a first fixed part; 212. an upper screw and a lower screw; 22. rotating the nut; 23. a front and rear screw adjuster; 231. a second fixed part; 232. a front screw and a rear screw; 24. a welding gun clamping device; 3. a semi-automatic gas shield welding torch; 4. a rail running mechanism connecting device; 41. a base; 42. a claw-type fixing structure; 421. fixing the screw rod; 422. fixing a nut; 423. a clamping lever; 5. a flexible track; 6. welding a base material; 61. beveling; 611. a first slope; 612. a second slope; 613. a blunt edge; 62. a reference plane.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

The embodiment of the invention provides a double-gun mechanized gas shield transverse welding method, which comprises the following steps as shown in the attached figure 1: s1, groove machining; s2, assembling and debugging the double-gun welding device; s3, preparing before welding; s4, backing welding; s5, filling by single-gun gas shielded welding; s6, welding by a double-gun welding device; and S7, welding the cover surface by single-gun gas shield.

With reference to fig. 5, in the step S1, the groove is processed, a first side of the groove 61 is processed into a first slope 611, and a second side of the groove 61 is processed into a second slope 612; the included angle between the first slope 611 and the reference surface 62 is 12.5 degrees to 17.5 degrees, and the included angle between the second slope 612 and the reference surface 62 is 27.5 degrees to 32.5 degrees, wherein the reference surface 62 is a plane perpendicular to the welding parent metal 6.

Specifically, the groove 61 is a gap formed at a position where the welding base material 6 needs to be welded, and is also referred to as a weld.

Specifically, the first side and the second side of the groove 61 are machined, so as to improve the machining accuracy.

Specifically, the reference surface 62 is a virtual plane, and is only used for determining the inclination of the first slope 611 and the second slope 612.

Specifically, the included angle between the first slope 611 and the reference surface 62 may be 13 degrees, 14 degrees, 14.4 degrees, 15.1 degrees, 17 degrees, or the like, or may be 10 degrees, 12 degrees, 18 degrees, 19.1 degrees, or the like, depending on the type and material of the welding parent metal 6.

Specifically, the included angle between the second slope 612 and the reference surface 62 may be 28.7 degrees, 29 degrees, 31.3 degrees, 32.2 degrees, 32 degrees, or the like, or may be 25 degrees, 26.5 degrees, 33 degrees, 34.6 degrees, or the like, depending on the type and material of the welding parent metal 6.

Furthermore, the included angle between the first slope 611 and the reference surface 62 is 15 degrees, and the included angle between the second slope 612 and the reference surface 62 is 30 degrees, so that the quality after welding can be further improved.

Furthermore, a 1 mm to 2 mm blunt edge 613 is reserved at the root of the first side and the second side of the groove 61, and the blunt edge 613 may be 1.2 mm, 1.7 mm, 1.9 mm, and the like. This can further improve the quality after welding. Of course, the blunt edge 613 may also be 0.7 mm, 0.9 mm, 2.3 mm, etc., according to actual requirements.

And S2, assembling and debugging the double-gun welding device, namely, firstly installing the double-gun welding device on the welding parent metal 6, and then debugging the double-gun welding device before welding.

Specifically, with reference to fig. 2, 3, 4 and 5, the twin gun welding apparatus includes: the device comprises a magnetic cutting machine travelling mechanism 1, two welding gun adjusting devices 2, two semi-automatic gas shield welding guns 3, a track travelling mechanism connecting device 4 and a flexible track 5.

Specifically, the two welding gun adjusting devices 2 are respectively arranged on two sides of the magnetic cutting machine walking mechanism 1.

Specifically, the two semi-automatic gas shield welding torches 3 are respectively arranged on the two welding torch adjusting devices 2.

Specifically, the rail travelling mechanism connecting device 4 is arranged on one side of the magnetic cutting machine travelling mechanism 1 and is connected with the flexible rail 5 in a sliding manner. The two welding gun adjusting devices 2 are respectively positioned on two sides of the rail travelling mechanism connecting device 4.

Specifically, the flexible rail 5 is made of a flexible material that can be bent, such as carbon steel, a plastic aluminum alloy, etc., and can be fixed to a base material to be welded by using the holding force of the flexible rail 5, and the degree of freedom perpendicular to the length direction of the weld can be precisely defined, and at the same time, the degree of freedom perpendicular to the surface direction of the weld can be defined in terms of the degree of movement.

Specifically, the magnetic cutting machine traveling mechanism 1 includes: the device comprises a shell, a transmission mechanism arranged in the shell and a walking assembly arranged on the shell.

Wherein, the casing can be rectangle box, trapezoidal box etc. according to the actual demand, and drive mechanism includes direct current servo motor, reduction gear and turbine etc. walking subassembly is including setting up magnetism gyro wheel on the casing, connection the magnetism gyro wheel and with pivot, setting that drive mechanism transmission is connected are in epaxial axle sleeve and setting are in the magnet steel etc. of casing. Of course, this is only an implementation manner, and according to actual requirements, only the housing and the traveling mechanism may be provided, and at this time, the traveling mechanism 1 of the magnetic cutting machine may be manually pushed to travel.

Specifically, the two semi-automatic gas shield welding torches 3 are detachably arranged on the two welding torch adjusting devices 2, respectively. Through the detachable setting, can make things convenient for the dismouting of semi-automatic gas shield welding welder 3.

Specifically, the welding gun adjusting device 2 includes: an up-down screw adjuster 21 provided on one side of the magnetic cutting machine traveling mechanism 1, a rotary nut 22 screwed with the up-down screw adjuster 21, a front-rear screw adjuster 23 provided on the rotary nut 22, and a welding gun clamping device 24 screwed with the front-rear screw adjuster 23.

The welding gun clamping device 24 is used for clamping the semi-automatic gas shield welding gun 3 to realize detachable arrangement, and a movable clamp or two clamping plates which are elastically connected can be used.

The up-down screw rod adjuster 21 can drive the welding gun fastener 24 to move along a first direction, the front-back screw rod adjuster 23 can drive the welding gun fastener 24 to move along a second direction, and the first direction is perpendicular to the second direction.

Of course, according to actual requirements, the welding gun adjusting device 2 may be provided with only the welding gun clamping device 24 for clamping the semi-automatic gas shield welding gun 3.

Specifically, the up-down screw adjuster 21 includes: a first fixing portion 211 fixed to one side of the magnetic cutting machine traveling mechanism 1, an upper and lower screw rod 212 inserted into the first fixing portion 211, and a first fixing screw (not shown) for fixing the upper and lower screw rod 212 to the first fixing portion 211, wherein the rotating nut 22 is in threaded connection with the upper and lower screw rod 212.

When needing to drive welding gun chucking ware 24 moves along first direction, can turn round loose first set screw, then, adjust upper and lower screw rod 212 is located position on the first fixed part 211, finally, turn round tight first set screw can.

Of course, according to actual requirements, the upper and lower screw rod adjusters 21 may not be provided with the first fixing screws, and at this time, the first fixing portion 211 may be provided with a clamping structure (such as a buckle, a fixing clip, etc.) to fix or loosen the upper and lower screw rods 212.

Specifically, the front-rear adjusting screw includes: a second fixing portion 231 fixed to the rotary nut 22, a front and rear screw rod 232 passing through the second fixing portion 231, and a second fixing screw (not shown) for fixing the front and rear screw rod 232 to the second fixing portion 231, wherein the front and rear screw rod 232 is perpendicular to the upper and lower screw rods 212, and the welding gun clamping device 24 is in threaded connection with the front and rear screw rod 232.

When needing to drive welding gun chucking ware 24 moves along the second direction, can turn round the pine second set screw, then, adjust front and back screw rod 232 is located position on the second fixed part 231, finally, turn round the tight second set screw can.

Of course, according to actual requirements, the front-rear screw adjuster 23 may not be provided with the second fixing screw, and at this time, the second fixing portion 231 may be provided with a clamping structure (such as a buckle, a fixing clip, etc.) to fix or loosen the front-rear screw 232.

Specifically, the two semi-automatic gas shield welding torches 3 have the same structure and model. Therefore, the welding synchronization of the two semi-automatic gas shield welding guns 3 can be ensured, and the welding quality is improved.

Of course, the structure and the model of the two semi-automatic gas shield welding torches 3 may be different according to actual requirements.

Specifically, the crawler attachment device 4 includes: the magnetic cutting machine comprises a base 41 arranged on one side of the magnetic cutting machine travelling mechanism 1 and two claw type fixing structures 42 arranged on the base 41 at intervals, wherein the claw type fixing structures 42 are connected with the flexible track 5 in a sliding mode.

Of course, according to actual requirements, the rail-mounted device 4 may not be provided with the base 41, and the two claw-type fixing structures 42 may be directly provided on one side of the magnetic cutting machine traveling mechanism 1.

Specifically, the base 41 is disposed on one side of the running mechanism 1 of the magnetic cutting machine through a plurality of third fixing screws (not shown in the figure). Therefore, the base 41 can be conveniently assembled and disassembled, and the base 41 can be better fixed on one side of the running mechanism 1 of the magnetic cutting machine.

Specifically, the base 41 is fixed to one side of the running mechanism 1 of the magnetic cutting machine by four third fixing screws. Of course, according to actual requirements, the base 41 may also be fixed to one side of the running mechanism 1 of the magnetic cutting machine by two third fixing screws, three third fixing screws, or five third fixing screws.

Specifically, the claw fixing structure 42 includes: the flexible track comprises a fixed screw 421 arranged on the base 41, two fixed nuts 422 screwed on the fixed screw 421, two fourth fixed screws (not shown in the figure) respectively fixing the two fixed nuts 422 on the fixed screw 421, and two clamping rods 423 which are respectively arranged on the two fixed nuts 422 and are parallel to each other, wherein the two clamping rods 423 are used for clamping the flexible track 5 and move along the flexible track 5.

The fixing nut 422 and the fourth fixing screw cooperate to drive the clamping rods 423 to move so as to adjust the position of the clamping rods 423 relative to the fixing screw 421, so that the two clamping rods 423 can better clamp the flexible rail 5 and can stably slide on the flexible rail 5.

Of course, according to actual requirements, the two clamping rods 423 may be fixed on the fixing screw 421 directly according to the width of the flexible track 5 without the fixing nut 422 and the fourth fixing screw; or only one of the clamping rods 423 may be fixed, and the other clamping rod 423 may be fixed by the fixing nut 422 and the fourth fixing screw.

When the double-gun welding device is assembled, the flexible track 5 is firstly installed on the welding parent metal 6, then the magnetic cutting machine travelling mechanism 1 is installed on the welding parent metal 6, then the two welding gun adjusting devices 2 are installed, and finally the semi-automatic gas shielded welding gun 3 is installed.

When the double-gun welding device is debugged, the front-back distance and the up-down distance of the gun heads in the two semi-automatic gas shield welding guns 3 are adjusted to 230-250 mm and 8-12 mm through the two welding gun adjusting devices 2.

Specifically, the front-rear pitch of the tips in the two semi-automatic gas shield welding torches 3 may be 233 mm, 241 mm, 245 mm, or the like, or may be 221 mm, 225 mm, 261 mm, or the like, depending on the type and material of the welding parent metal 6.

Specifically, according to the type and material of the welding parent metal 6, the distance between the upper and lower tips of the two semi-automatic gas shield welding torches 3 may be 8.5 mm, 10.1 mm, 11.5 mm, or the like, and may also be 7 mm, 7.5 mm, 13.1 mm, or the like.

Specifically, through setting up magnetic force cutting machine running gear 1, rail running gear connecting device 4 and flexible track 5, thereby make the device accessible magnetic force cutting machine running gear 1 provide walking power, it forms dual running gear to cooperate rail running gear connecting device 4 and flexible track 5 again, it is more stable when making it walk, then, through setting up two welder adjusting device 2, and set up two semi-automatic gas shield welding welder 3 respectively on two welder adjusting device 2, and then make the device realize the mechanized gas shield welding of two welder, welding efficiency has been improved substantially, the manpower is saved, and the device still makes it not only be applicable to the welding of board butt joint through setting up of flexible track 5, can also be applicable to the welding of pipe butt joint, very big increase the suitability of device.

Step S3, preparing before welding, adjusting the root gap of the groove 61 to 2 mm to 4 mm, polishing both sides of the groove 61, and finally preheating both sides of the groove 61.

Specifically, the root of the groove 61 is the bottom of the welding position.

Specifically, before adjusting the root gap of the groove 61, the machining quality of the groove 61 may be checked to ensure that the machining quality of the groove 61 meets the requirement.

Specifically, the root gap of the groove 61 may be adjusted to 2.1 mm, 2.5 mm, 3.8 mm, or the like, or may be adjusted to 1.5 mm, 4.3 mm, 5mm, or the like, depending on the type and material of the welding parent metal 6.

Specifically, the side walls of the two sides of the groove 61, which are spaced less than 25mm apart from each other, can be only polished during polishing to remove oil, rust, sand, paint, splash, water vapor or other external impurities in the range, thereby ensuring the welding quality, and improving the polishing efficiency due to the small-range polishing. Of course, according to actual requirements, the side wall with the distance between two sides of the groove 61 being less than 20 mm, 30 mm, or 34.1 mm may also be ground.

Specifically, during preheating, only the side walls of the two sides of the groove 61 with the distance smaller than 75 mm can be preheated, so that the preheating effect can be achieved, and the preheating efficiency can be improved. Of course, according to actual requirements, the side walls of the groove 61 with a distance smaller than 70 mm, 78 mm, or 80 mm may also be preheated.

Specifically, the preheating temperature is selected according to the preheating standard of the welding parent metal 6.

And S4, backing welding, namely backing welding the groove 61 by using hand welding, wherein a single-layer single-pass welding mode is adopted during welding.

Specifically, the welding rod used in the stick welding is selected according to the type and material of the welding parent metal 6.

Specifically, parameters during welding were set to 80 to 100 amperes of welding current, 20 to 22 volts of welding voltage, 40 to 60 millimeters per minute of welding speed, and 2.5 kilojoules per millimeter of maximum heat input.

Specifically, the welding current may be 85 a, 91.3 a, or 97.8 a, or may be 75.4 a, 105 a, or 110 a, depending on the type and material of the welding base material 6. The welding voltage may be 20.3 volts, 21.5 volts, 21.8 amps, etc., and may of course be 18.7 volts, 19.4 volts, 23.3 volts, etc. The welding speed may be 42.5 millimeters per minute, 50.7 millimeters per minute, 57.3 millimeters per minute, etc., but may also be 37.6 millimeters per minute, 39.1 millimeters per minute, 62.3 millimeters per minute, etc. The maximum heat input may also be 2.1 kilojoules per millimeter, 2.4 kilojoules per millimeter, 2.7 kilojoules per millimeter, etc.

And S5, filling single-gun gas shielded welding, and performing second welding on the groove 61 subjected to backing welding by using the single-gun gas shielded welding, wherein a single-welding mode is adopted during welding.

Specifically, the welding surface after backing welding should be cleaned before welding to ensure the cleanness of the welding surface during single-gun gas shielded welding.

Specifically, the welding parameters during welding are 230-260 amperes of welding current, 24-26 volts of welding voltage, 260-300 millimeters per minute of welding speed and 1.8 kilojoules per millimeter of maximum heat input.

Specifically, the welding current may be 237 ampere, 240 ampere, 255 ampere, 227 ampere, 267 ampere, 270 ampere, or the like, depending on the type and material of the welding base material 6. The welding voltage may be 24.3 volts, 24.5 volts, 25.8 amps, etc., but may be 22.7 volts, 23.4 volts, 26.3 volts, etc. The welding speed may be 267 millimeters per minute, 287 millimeters per minute, 296 millimeters per minute, etc., but may of course be 245 millimeters per minute, 253 millimeters per minute, 311 millimeters per minute, etc. The maximum heat input may also be 1.7 kilojoules per millimeter, 1.84 kilojoules per millimeter, 1.9 kilojoules per millimeter, etc.

And S6, welding by using a double-gun welding device, and performing third welding on the groove 61 after the second welding by using the double-gun welding device, wherein a multi-layer and multi-pass welding mode is adopted during welding.

Specifically, the welding surface filled in the single-gun gas shielded welding is cleaned before welding, so that the welding surface is clean when the double-gun welding device is used for welding.

Specifically, the welding parameters during welding are welding current 220-250A, welding voltage 23-26V, welding speed 270-300 mm/min and maximum heat input 1.5 KJ/mm.

Specifically, the welding current may be 237 ampere, 240 ampere, 245 ampere, or 217 ampere, 257 ampere, 260 ampere, or the like, depending on the type and material of the welding base material 6. The welding voltage may be 23.3 volts, 24.5 volts, 25.8 amps, etc., but may be 22.7 volts, 26.1 volts, 27 volts, etc. The welding speed may be 277 millimeters per minute, 286 millimeters per minute, 295 millimeters per minute, etc., but may of course be 255 millimeters per minute, 263 millimeters per minute, 312 millimeters per minute, etc. The maximum heat input may also be 1.45 kilojoules per millimeter, 1.47 kilojoules per millimeter, 1.6 kilojoules per millimeter, etc.

And S7, performing single-gun gas shielded welding capping, and performing capping welding on the groove 61 after the third welding by using single-gun gas shielded welding, wherein a multi-pass welding mode is adopted during welding.

Specifically, the welding surface welded by the double-gun welding device is cleaned before welding so as to ensure the cleanness of the welding surface during welding of the cover surface of the single-gun gas shielded welding.

Specifically, the welding parameters during welding are welding current 210 ampere to 220 ampere, welding voltage 23 volt to 24 volt, welding speed 300 millimeter to 350 millimeter per minute, and maximum heat input 1.2 kilojoule per millimeter.

Specifically, the welding current may be 212 ampere, 215 ampere, 218 ampere, or 207 ampere, 227 ampere, 230 ampere, or the like, depending on the type and material of the welding base material 6. The welding voltage may be 23.3 volts, 23.5 volts, 23.8 amps, etc., and may of course be 21.7 volts, 22.3 volts, 25 volts, etc. The welding speed may be 317 mm per minute, 236 mm per minute, 245 mm per minute, etc., but may also be 285 mm per minute, 293 mm per minute, 362 mm per minute, etc. The maximum heat input may also be 1.15 kilojoules per millimeter, 1.27 kilojoules per millimeter, 1.3 kilojoules per millimeter, etc.

Wherein the welding shielding gas in the step S4, backing welding, the step S5, single gun gas shielded welding filling, the step S6, the welding with the double gun welding device, and the step S7, the single gun gas shielded welding cover surface is carbon dioxide, and the purity of the carbon dioxide is 99.8 percent. This may further improve the quality of the weld.

In the embodiment of the invention, the groove 61 is processed and combined with four welding processes, and the third welding process is carried out by using a double-gun welding device, so that the welding quality and the welding efficiency are greatly improved, and the labor is saved.

Example one

The welding parent metal 6 is a jacket upright post lacing wire, the specification of the welding parent metal is phi 610mm multiplied by 25mm, and the material is EH36 rolling submerged arc welding pipe of GB 712 standard.

As shown in fig. 1 to 5, the welding step includes: step S1, processing the groove 61, namely processing a first side of the groove 61 into a first slope 611, and then processing a second side of the groove 61 into a second slope 612; the included angle between the first slope 611 and the reference surface 62 is 15 degrees, and the included angle between the second slope 612 and the reference surface 62 is 30 degrees.

Wherein, a 1.5 mm blunt edge 613 is reserved at the root of the first side and the second side of the groove 61.

Step S2, assembling and debugging the twin-gun welding apparatus, namely, mounting the twin-gun welding apparatus on the welding parent metal 6, and debugging the twin-gun welding apparatus before welding.

During debugging, the front-back distance of the gun heads of two semi-automatic gas shield welding guns 3 in the double-gun welding device is 240 mm, and the upper-lower distance of the gun heads is 10 mm.

Step S3, preparing before welding, namely adjusting the root clearance of the groove 61 to 3 mm, polishing the side walls with the distance between two sides of the groove 61 being less than 25mm, and preheating the side walls with the distance between two sides of the groove 61 being less than 75 mm at a temperature of more than 38 ℃.

And step S4, backing welding, namely backing welding the groove 61 by using hand welding, wherein a single-layer single-pass welding mode is adopted during welding.

The welding rod adopted during welding is an LB-52U welding rod, the welding parameters are welding current 90A (ampere or ampere), welding voltage 21V (volt or volt), welding speed 50 mm/Min (millimeter per minute), maximum heat input 2.5 KJ/mm (kilojoule per millimeter), the protective gas is carbon dioxide, the purity is 99.8%, and the flow rate is 20L/Min (liter per minute).

And step S5, filling single-gun gas shielded welding, and performing second welding on the groove 61 subjected to backing welding by using the single-gun gas shielded welding, wherein a single-welding mode is adopted during welding.

The welding rod adopted during welding is a TWE-711Ni welding wire, the welding parameters are welding current 245A, welding voltage 25V and welding speed 280 mm/Min, the heat input is controlled to be 1.2 KJ/mm-1.6 KJ/mm, the protective gas is carbon dioxide, the purity is 99.8 percent, and the flow rate is 20L/Min.

S6, welding by a double-gun welding device, and carrying out third welding on the groove 61 after the second welding by the double-gun welding device, wherein a multi-layer multi-pass welding mode is adopted during welding.

The welding rod adopted during welding is a TWE-711Ni welding wire, welding parameters are set to be 240A of welding current, 24V of welding voltage and 285 mm/Min, heat input is controlled to be 1.1KJ/mm to 1.5 KJ/mm, shielding gas is carbon dioxide, the purity is 99.8 percent, and the flow rate is 20L/Min.

And (3) single-gun gas shielded welding cover surface, wherein the groove 61 is subjected to cover surface welding after the third welding by using single-gun gas shielded welding, and a plurality of welding modes are adopted during welding.

The welding rod adopted during welding is a TWE-711Ni welding wire, welding parameters are set to be 215A of welding current, 23.5V of welding voltage and 325 mm/Min of welding speed, the heat input is controlled to be 0.9KJ/mm to 1.2KJ/mm, the protective gas is carbon dioxide, the purity is 99.8 percent, and the flow rate is 20L/Min.

The welding parent metal 6 in this embodiment uses a double-gun mechanical gas shield horizontal welding method, so that the welding quality and the welding efficiency can be greatly improved, and the labor can be saved.

Example two

The welding parent metal 6 is GB 712 EH36 normalized steel having a tensile strength of not less than 490 MPa.

As shown in fig. 1 to 5, the welding step includes: step S1, processing the groove 61, namely processing a first side of the groove 61 into a first slope 611, and then processing a second side of the groove 61 into a second slope 612; the included angle between the first slope 611 and the reference surface 62 is 16 degrees, and the included angle between the second slope 612 and the reference surface 62 is 31 degrees.

Wherein, a 1.7 mm blunt edge 613 is reserved at the root of the first side and the second side of the groove 61.

And during debugging, the front-back distance of the gun heads of two semi-automatic gas shield welding guns 3 in the double-gun welding device is 245 mm, and the upper-lower distance of the gun heads is 11 mm.

Step S3, preparing before welding, firstly adjusting the root clearance of the groove 61 to 3.5 mm, then polishing the side walls with the distance between two sides of the groove 61 being less than 25mm, and finally preheating the side walls with the distance between two sides of the groove 61 being less than 75 mm at a temperature of more than 40 ℃.

Wherein, the welding rod adopted during welding is an AWS A5.1E 7016 welding rod, the welding parameters are welding current 95A (ampere or ampere), welding voltage 21.5V (volt or volt), welding speed 55 mm/Min (millimeter per minute), maximum heat input 2.5 KJ/mm (kilojoule per millimeter), protective gas is carbon dioxide, the purity is 99.8 percent, and the flow rate is 20L/Min (liter per minute).

The welding rod adopted during welding is an AWS A5.20E 71T-1CJ welding wire, the welding parameters are welding current 250A, welding voltage 26V and welding speed 285 mm/Min, the heat input is controlled to be 1.2 KJ/mm-1.6 KJ/mm, the protective gas is carbon dioxide, the purity is 99.8%, and the flow rate is 20L/Min.

The welding rod adopted during welding is an AWS A5.20E 71T-1CJ welding wire, welding parameters are set to be welding current 245A, welding voltage is 25V, welding speed is 295 mm/Min, heat input is controlled to be 1.2 KJ/mm-1.5 KJ/mm, shielding gas is carbon dioxide, purity is 99.8%, and flow rate is 20L/Min.

The welding rod adopted during welding is an AWS A5.20E 71T-1CJ welding wire, welding parameters are set to be 220A of welding current, 24V of welding voltage and 340 mm/Min of welding speed, the heat input is controlled to be 1KJ/mm to 1.2KJ/mm, the protective gas is carbon dioxide, the purity is 99.8%, and the flow rate is 20L/Min.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims

1. A double-gun mechanized gas shield horizontal welding method is characterized in that: the method comprises the following steps:

s1, processing a groove, namely processing a first side of the groove into a first slope, and then processing a second side of the groove into a second slope; the included angle between the first slope and the reference surface is 12.5 degrees to 17.5 degrees, the included angle between the second slope and the reference surface is 27.5 degrees to 32.5 degrees, and the reference surface is a plane perpendicular to the welding base metal;

s2, assembling and debugging the double-gun welding device, namely, firstly installing the double-gun welding device on the welding parent metal, and then debugging the double-gun welding device before welding;

s3, preparing before welding, namely adjusting the root clearance of the groove to 2-4 mm, polishing two sides of the groove, and finally preheating the two sides of the groove;

s4, backing welding, namely backing welding the groove by using hand welding, wherein a single-layer single-pass welding mode is adopted during welding;

s5, filling single-gun gas shielded welding, and performing second welding on the groove subjected to backing welding by using the single-gun gas shielded welding, wherein a single-welding mode is adopted during welding;

s6, welding by a double-gun welding device, and performing third welding on the groove after the second welding by using the installed double-gun welding device, wherein a multi-layer multi-pass welding mode is adopted during welding;

2. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: in the step S1, an included angle between the first slope and the reference plane in groove machining is 15 degrees, and an included angle between the second slope and the reference plane is 30 degrees.

3. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: and step S1, reserving 1-2 mm truncated edges at the roots of the first side and the second side of the groove in the groove machining.

4. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: s2, the double-gun welding device in the assembling and debugging of the double-gun welding device comprises:

a magnetic cutting machine traveling mechanism;

the two welding gun adjusting devices are respectively arranged on two sides of the travelling mechanism of the magnetic cutting machine;

the two semi-automatic gas shield welding guns are respectively arranged on the two welding gun adjusting devices;

the track running mechanism connecting device is arranged on one side of the magnetic cutting machine running mechanism and is in sliding connection with the flexible track.

5. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: and S3, preheating the two sides of the groove in the preparation before welding, specifically, preheating the side walls with the distance between the two sides of the groove being less than 75 mm.

6. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: in step S4, the welding parameters in the backing welding are set to 80 to 100 amperes of welding current, 20 to 22 volts of welding voltage, 40 to 60 millimeters per minute of welding speed, and 2.5 kilojoules per millimeter of maximum heat input.

7. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: and step S5, welding parameters in the single-gun gas shielded welding filling are 230-260 amperes of welding current, 24-26 volts of welding voltage, 260-300 millimeters per minute of welding speed and 1.8 kilojoules per millimeter of maximum heat input.

8. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: and step S6, welding parameters in the welding of the double-gun welding device are welding current 220-250A, welding voltage 23-26V, welding speed 270-300 mm/min and maximum heat input 1.5 KJ/mm.

9. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: and step S7, welding parameters in the single-gun gas shield welding cover surface are welding current 210-220A, welding voltage 23-24V, welding speed 300-350 mm/min and maximum heat input 1.2 KJ/mm.

10. The double-gun mechanized gas shielded cross welding method according to claim 1, characterized in that: the welding protective gas in the step S4, backing welding, the step S5, single gun gas shielded welding filling, the step S6, the welding of the double gun welding device, and the step S7 and the single gun gas shielded welding cover surface is carbon dioxide, and the purity of the carbon dioxide is 99.8 percent.