CN111558769A - Automatic welding protection device for straight seam of titanium welded pipe and using method thereof - Google Patents
Automatic welding protection device for straight seam of titanium welded pipe and using method thereof Download PDFInfo
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- CN111558769A CN111558769A CN202010341672.4A CN202010341672A CN111558769A CN 111558769 A CN111558769 A CN 111558769A CN 202010341672 A CN202010341672 A CN 202010341672A CN 111558769 A CN111558769 A CN 111558769A
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
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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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
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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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- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
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Abstract
The invention discloses an automatic straight seam welding protection device for a titanium welded pipe and a using method thereof, wherein the automatic straight seam welding protection device comprises a device body, a positioning system for positioning the device body, a cooling system for cooling the titanium welded pipe and a gas protection system for protecting the titanium welded pipe; the device body is provided with a sliding cavity surface which is used for being in sliding connection with the outer surface of the titanium welding pipe, and the sliding cavity surface is adapted to the outer surface of the titanium welding pipe; the cooling system comprises a cooling channel arranged in the device body, and a water inlet pipe and a water outlet pipe which are communicated with the cooling channel; the gas protection system comprises a groove and a gas inlet pipe which are arranged on the sliding cavity surface and used for circulating protection gas. The invention obviously improves the plasticity and toughness of the titanium welded pipe, reduces the production cost and improves the labor condition.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to an automatic straight seam welding protection device for a titanium welded pipe and a using method thereof.
Background
Titanium and titanium alloy straight welded pipes (simply referred to as "titanium welded pipes") are formed by welding straight welded pipes obtained by crimping a titanium and titanium alloy coil or a wide plate into a pipe shape and then crimping the pipe shape by welding. The titanium welded pipe is produced through an automatic continuous production line, and the straight seam welding generally adopts Tungsten Inert Gas (TIG) automatic welding, plasma arc automatic welding or TIG-plasma arc composite automatic welding. Titanium welded pipes are used for replacing traditional copper alloy pipes for heat exchangers and condenser devices at home and abroad in a large quantity, so that the service life of equipment and facilities such as seawater desalination equipment, ships, offshore petroleum engineering, power stations and the like can be greatly prolonged, the maintenance cost is reduced, and the economic benefit is very obvious.
Titanium and titanium alloy can absorb hydrogen rapidly at the temperature of more than 300 ℃, absorb oxygen rapidly at the temperature of more than 450 ℃ and absorb nitrogen rapidly at the temperature of more than 600 ℃, so that strict inert gas or vacuum protection is needed to be carried out on a welding heat affected zone including weld metal and a welding heat affected zone during welding and after welding of the titanium alloy, and titanium alloy can be embrittled obviously as long as a small amount of hydrogen, oxygen and nitrogen are absorbed, wherein the influence of hydrogen is the largest. Therefore, the key to welding titanium and titanium alloys is the protection of the heated welding zone, including the protection of the welding process and the protection after welding.
At present, in the actual production of the titanium welded pipe, the automatic straight seam welding protection device of the titanium welded pipe only adopts a cuboid box-shaped protection cover to protect the weld metal and the welding heat affected zone which are still in the high-temperature section after welding, namely the weld metal and the welding heat affected zone which are still in the high-temperature section are isolated from the air by continuously filling flowing argon into the protection cover, and the protective effect on the straight seam welding of the titanium welded pipe is achieved. The rectangular box-shaped protective cover can achieve good protection effect on titanium and titanium alloy welding at a common welding speed, but cannot achieve sufficient protection on high-speed automatic welding of titanium and titanium alloy. The method is synchronous to the processing speed of the automatic continuous production line of the titanium welded pipe, the straight seam welding speed of the titanium welded pipe reaches 5-8 m/min, and is far higher than that of the general automatic welding process. Under the condition of high-speed welding, the time that the weld metal and the welding heat affected zone of the titanium and titanium alloy welding joint are positioned in the protective cover is short, and the protection of inert gas in the protective cover is separated due to insufficient cooling, namely the weld metal and the welding heat affected zone of the titanium welding pipe straight seam are separated from the protection of the inert gas when the weld metal and the welding heat affected zone are still at high temperature (T is more than 300 ℃), so that the weld metal and the welding heat affected zone of the titanium welding pipe absorb a large amount of hydrogen, oxygen and nitrogen in the air, the ductility and toughness of the titanium welding pipe straight seam welding joint is obviously lower than that of a base metal, the titanium welding pipe is easy to crack in the welding joint zone during further plastic processing, and the difficulty and the cost of the plastic processing of the titanium. Meanwhile, the protective cover is adopted to protect the titanium welded pipe, and the titanium welded pipe needs to be continuously filled with inert gas with high flow (about 30L/min), so that the production cost of the titanium welded pipe is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an automatic straight seam welding protection device for a titanium welded pipe and a using method thereof.
In order to achieve the above object, the present invention adopts the following technical solutions:
an automatic straight seam welding protection device for a titanium welded pipe comprises a device body, a positioning system for positioning the device body, a cooling system for cooling the titanium welded pipe and a gas protection system for protecting the titanium welded pipe;
the device body is provided with a sliding cavity surface which is used for being in sliding connection with the outer surface of the titanium welding pipe, and the sliding cavity surface is adapted to the outer surface of the titanium welding pipe;
the cooling system comprises a cooling channel arranged in the device body, and a water inlet pipe and a water outlet pipe which are communicated with the cooling channel;
the gas protection system comprises a groove and a gas inlet pipe which are arranged on the sliding cavity surface and used for circulating protection gas;
further, the groove includes welding seam protection gas groove, heat affected zone protection gas groove, air duct and goes out the air duct, welding seam protection gas groove, heat affected zone protection gas groove all vertically set up in on the sliding cavity face, vertically be with titanium welded tube axial direction parallel's direction, the air duct intercommunication welding seam protection gas groove and heat affected zone protection gas groove, heat affected zone protection gas groove set up in the week side in welding seam protection gas groove, welding seam protection gas groove is connected with the intake pipe, heat affected zone protection gas groove intercommunication has the air duct, and protective gas passes through the intake pipe gets into welding seam protection gas groove, through go out the air duct outflow.
Further, the heat affected zone protective gas groove is communicated with the welding seam protective gas groove through a plurality of vent grooves and is communicated with the outside through a plurality of gas outlet grooves; the vent groove and the air outlet groove are respectively arranged transversely and are arranged in a staggered manner, and the transverse direction is vertical to the longitudinal direction.
Furthermore, the welding seam protection gas groove, the heat affected zone protection gas groove, the vent groove and the gas outlet groove are all formed by grooves formed in the sliding cavity surface, and the groove depth of the welding seam protection gas groove is larger than the groove depth of the heat affected zone protection gas groove, the vent groove and the gas outlet groove.
Furthermore, the air inlet pipe is communicated with the welding seam protection gas groove, and protection gas firstly enters the welding seam protection gas groove through the air inlet pipe.
Further, a layer of 0.5-1.5 mm self-lubricating heat-resistant wear-resistant copper-based composite coating is coated on the sliding cavity surface, and the coating comprises the following components in percentage by mass: 5-6.5% of Mo, SiC: 0.1-0.3%, AlN 0.2-0.5%, MoS2: 3~4.2%，CaF 21 to 1.5 percent, and the balance of Cu.
Furthermore, the positioning system comprises a spring tensioning mechanism for elastically fixing the device body, a front baffle and a rear baffle which are fixed on the production line rack, and a transverse positioning mechanism for adjusting the position of the device body; the transverse positioning mechanism comprises a cross beam and side baffles arranged at two ends of the cross beam, a rack is arranged on the cross beam, an adjusting knob is arranged on the front baffle, the adjusting knob is meshed with the rack through a gear and rotates, and the gear drives the side baffles to move through the rack.
Furthermore, the sliding cavity surface is concave, and the cross section comprises an arc shape, a rectangle and a polygon.
The invention also discloses a use method of the automatic straight seam welding protection device for the titanium welded pipe, which comprises the following steps:
(1) selecting a proper device body according to the size of the titanium welded pipe;
(2) installing a positioning system on a rack of a titanium welded pipe production line;
(3) placing the device body in a positioning system and tensioning by using a spring;
(4) adjusting the side baffle plate by using a fine adjustment knob until the sliding cavity surface of the device body is completely attached to the titanium welded pipe, and then clamping the side baffle plate by using a clamping knob;
(5) a water inlet pipe, a water outlet pipe and an air inlet pipe are connected, and a welding gun is installed;
(6) starting the heat exchanger, and starting the circulation of cooling water;
(7) feeding protective gas with flow rate of 10-12L/min;
(8) starting a titanium welded pipe production line to start welding;
(9) the heat exchanger is adjusted to ensure that the temperature of the outlet water is not higher than 24 ℃.
Further, the step (1): the width of the device body is 0.75-0.9 times of the diameter of the titanium welding pipe, and the length is 250-300 mm.
The invention has the advantages that: (1) the problem of insufficient straight seam protection of the titanium welded pipe under the high-speed welding condition is solved by jointly protecting the high-temperature area of the straight seam welding of the titanium welded pipe by using quenching and inert gas; (2) the special design of the protective gas groove avoids gas turbulence, completely prevents air from entering a protective area, and greatly reduces the consumption of inert gas; (3) the self-developed self-lubricating heat-resistant wear-resistant copper-based composite coating is coated on the surface of the sliding cavity at the bottom of the device, so that the heat conductivity is ensured, the friction, adhesion and abrasion between the titanium welded pipe and the coating at high temperature are avoided, and the device is very suitable for the requirement of high-speed continuous straight seam automatic welding on a titanium welded pipe production line; (4) in the welding process, as the device continuously quenches the welding seam and the welding heat affected zone of the titanium welding pipe, the device can refine crystal grains, further improve the plasticity and toughness of the titanium welding pipe and reduce the welding deformation of the titanium welding pipe; (5) in the welding process, the arc light is completely shielded by the device, and the labor condition is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an automatic straight seam welding protection device for a titanium welded pipe according to the present invention.
FIG. 2 is a schematic structural diagram of a gas protection system of an automatic straight seam welding protection device for a titanium welded pipe according to the present invention.
FIG. 3 is a schematic cross-sectional view of the device body of the automatic straight seam welding protection device for titanium welded pipes of the present invention.
FIG. 4 is a schematic structural diagram of a front baffle, a rear baffle and a side baffle in the automatic straight seam welding protection device for the titanium welded pipe of the invention.
FIG. 5 is a schematic view of a side baffle fine-tuning structure of the automatic straight seam welding protection device for titanium welded pipes according to the present invention.
The designations in the drawings have the following meanings: 1. the device comprises a device body, 2, a titanium welded pipe, 3, a sliding cavity surface, 4, a self-lubricating heat-resistant wear-resistant copper-based composite coating, 5, a welding chamber, 6, a welding gun, 7, an observation window, 8, a water inlet pipe, 9, a cooling channel, 10, a water outlet pipe, 11, a heat exchanger, 12, a gas inlet pipe, 13, a welding seam protection gas groove, 14, a heat affected zone protection gas groove, 15, a vent groove, 16, a gas outlet groove, 17, a spring tensioning mechanism, 18, a front baffle, 19, a side baffle, 20, a rear baffle, 21, a welding heat affected zone, 22, a welding seam, 23, heat insulation cotton, 24, a fine adjustment knob, 25, a clamping knob, 26, a beam, 27 and a rack.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
As shown in figure 1, the automatic straight seam welding protection device for the titanium welded pipe 2 comprises a device body 1, a positioning system, a cooling system and a gas protection system.
The material of the device body 1 is preferably red copper, and in this embodiment, the shape is a rectangular parallelepiped, and the top surface thereof isThe level, the bottom is equipped with the arc sliding chamber that is concave shape, and sliding chamber face 3 is used for laminating with weldment face (2 welding faces of titanium welded pipe), and sliding chamber face 3 coats self-developing heat-resisting wear-resisting copper base composite coating of self-lubricating 4, and its composition (mass percent) is: 5-6.5% of Mo, SiC: 0.1-0.3%, AlN 0.2-0.5%, MoS2: 3~4.2%，CaF 21 to 1.5 percent, and the balance of Cu.
The device body 1 is longitudinally provided with a welding chamber 5, the head of a welding gun 6 is arranged in the welding chamber 5, the top of the welding chamber 5 is provided with an observation window 7, and the observation window 7 is preferably provided with a light-changing glass blocking.
As shown in fig. 2, the gas protection system is composed of an inlet pipe 12, and a weld bead protection gas groove 13, a heat affected zone protection gas groove 14, a vent groove 15, and an outlet groove 16 provided on the sliding cavity surface 3. The heat affected zone protective gas grooves 14 and the welding seam protective gas grooves 13 are longitudinally arranged on the sliding cavity surface of the device body, and are longitudinally parallel to the axial direction of the titanium welded pipe, and at least two heat affected zone protective gas grooves 14 are uniformly distributed on two sides of the welding seam protective gas grooves 13; the welding seam protection gas groove 13 is axially arranged at the central part of the device body 1, preferably, the welding seam protection gas groove 13 is 0.2-1.0mm wider than the welding seam 22; the heat affected zone protective gas groove 14 is communicated with the welding seam 22 protective gas chamber 13 through a plurality of vent grooves 15, the vent grooves 15 are perpendicular to the heat affected zone protective gas groove 14 and the welding seam protective gas groove 13, and the gas outlet groove 16 is transversely arranged on the outer ring of the heat affected zone protective gas groove 14 and is communicated with the two sides of the device body 1; the vent grooves 15 and the vent grooves 16 are arranged in a staggered manner. The air inlet pipe 12 is arranged on the top surface of the device body 1 and communicated with the welding seam 22 to protect the air chamber 13. The transverse direction in the invention is the direction vertical to the titanium welded pipe.
As shown in fig. 1 and 3, the cooling system is composed of a cooling channel 9, a water inlet pipe 8, a water outlet pipe 10 and a heat exchanger 11. The cross section of the cooling channel 9 in the device body 1 is U-shaped and is arranged on the periphery of the welding seam protection gas groove 13, and two ends of the cooling channel are respectively connected with the heat exchanger 11 in series through a water inlet pipe 8 and a water outlet pipe 10.
As shown in fig. 1 and 4, the positioning system is composed of a front baffle 18, a rear baffle 20, a transverse positioning mechanism and a spring tensioning mechanism 17, wherein the front baffle 18 and the rear baffle 20 are respectively used for resisting two ends of the device body 1 and are respectively in a U shape, the bottom ends of the U shapes at two sides are respectively fixedly connected, and the front baffle 18 and the rear baffle 20 are both fixed on a frame of the automatic welding production line for the titanium welded pipe 2. The spring tensioning mechanism 17 is composed of a hanging lug, a spring and a positioning column which are arranged on two sides of the device body 1, and the hanging lug is pulled down through the spring after the positioning column is fixed at a fixed point on the production line rack, so that the sliding cavity surface 3 of the device body 1 is further attached to the surface of a weldment.
As shown in fig. 5, the transverse positioning mechanism includes a cross beam and two side guards 19 disposed at two ends of the cross beam, the distance between the two side guards 19 is adapted to the width of the apparatus body, so that the side guards can be respectively disposed at two sides of one end of the apparatus body. Side shield and crossbeam fixed connection, be provided with the spout on the baffle in the front, the crossbeam slides and sets up in the spout, the crossbeam sets up the direction and titanium welded pipe axial vertical, be provided with the rack along the crossbeam on the crossbeam, be provided with fine setting knob 24 on the baffle in the front, be provided with the gear on the fine setting knob 24, the gear is connected with the meshing of rack, adjust transverse positioning mechanism about through rotatory fine setting knob, the side shield drives the device body and removes to laminating completely with the titanium welded pipe, welding seam 22 is located the bottom center of welding seam protection gas tank 13, then the position of rotatory clamping knob 25 fixed transverse positioning mechanism, press from both sides the bolt of screwing 25 for setting up on the baffle in the front, the terminal surface supports to press transverse positioning mechanism to realize fixing under the spiral. The width of the device body 1 is preferably 0.75-0.9 times of the diameter of the titanium welding pipe 2, and the length is preferably 250-300 mm. The radius of the arc-shaped concave sliding cavity surface 3 is equal to the outer diameter of the titanium welded pipe 2, and the arc-shaped concave sliding cavity surface 3 is aligned with a welding seam 22 of the titanium welded pipe 2 and tightly attached to a welding heat affected zone 21 and peripheral base metal of the titanium welded pipe 2 through the positioning of a front baffle plate 18, a side baffle plate 19 and a rear baffle plate 20 of a positioning system and the tensioning of a spring mechanism; the sliding cavity surface 3 is coated with a self-lubricating heat-resistant wear-resistant copper-based composite coating 4 which is independently researched and developed, so that the high heat conductivity is ensured, and the adhesion wear between the sliding cavity surface 3 and the surface of the titanium welded pipe 2 in high-temperature high-speed relative sliding friction is prevented.
After the arc-shaped concave sliding cavity surface 3 is tightly attached to the welding heat affected zone 21 of the titanium welded pipe 2 and the peripheral parent metal, the heat of the welding seam 22 metal and the welding heat affected zone 21 is rapidly absorbed by the device body 1, the cooling system transfers the heat absorbed by the device body 1 to the heat exchanger 11 through cooling water, the heat exchanger 11 realizes the dissipation of the welding seam 22 metal and the welding heat affected zone 21 heat of the titanium welded pipe 2, and the sharp quenching of the welding seam 22 metal and the welding heat affected zone 21 of the straight seam joint of the titanium welded pipe 2 is realized.
After the arc-shaped concave sliding cavity surface 3 of the device body 1 is tightly attached to the titanium welded pipe 2, a welding seam protection gas groove 13, a heat affected zone protection gas groove 14, a vent groove 15 and a gas outlet groove 16 of a gas protection system form a protection gas flow channel. The shielding gas is continuously fed through the air inlet pipe 12, the welding seam shielding gas groove 13, the vent groove 15, the heat affected zone shielding gas groove 14 and the air outlet groove 16 are continuously filled with flowing shielding gas, so that external air is isolated from entering the area of the titanium welding pipe 2 covered by the arc-shaped concave sliding cavity surface 3, and the metal of a welding seam 22 of a straight seam joint of the titanium welding pipe 2 and a welding heat affected zone 21 are prevented from being polluted by air. Due to the quenching action of the device body 1, after the metal of the welding seam 22 of the straight seam joint of the titanium welding pipe 2 and the welding heat affected zone 21 are separated from the protection of the sliding cavity surface 3, the temperature is reduced to below 300 ℃, hydrogen, oxygen and nitrogen in the air can not be absorbed, and the good protection of the straight seam joint of the titanium welding pipe 2 on a production line under the high-speed welding condition is realized.
The automatic straight seam welding protection device for the titanium welded pipe 2 is suitable for TIG automatic welding, plasma arc automatic welding or TIG-plasma arc automatic composite welding of the titanium welded pipe 2; a welding chamber 5 is designed in the device body 1, a gun head of a welding gun 6 is arranged in the welding chamber 5, welding electric arc is combusted in the welding chamber 5, heat insulation cotton 23 is attached to the surfaces of the four walls of the welding chamber 5, and the device body 1 is prevented from being influenced by electric arc radiant heat. An observation window 7 is arranged above the welding chamber 5, the observation window 7 is preferably made of light-changing glass, and the welding condition can be directly observed in the welding process.
The invention provides a using method of an automatic straight seam welding protection device of a titanium welded pipe 2, which comprises the following steps:
production conditions of the titanium welded pipe 2 are as follows: the titanium welded pipe 2 is made of TA2, the diameter is 200 mm, the wall thickness is 3 mm, the welding method is plasma arc welding, the shielding gas is pure argon, and the welding speed is 6 m/min.
(1) Selecting proper device body 1 according to the size of the titanium welded pipe 2
The device body 1 is made of red copper, the length of the red copper is 300 mm, the width of the red copper is 180 mm, the sliding cavity surface 3 at the bottom of the device body 1 is coated with a self-lubricating heat-resistant wear-resistant copper-based composite coating 4 which is independently researched and developed, and the self-lubricating heat-resistant wear-resistant copper-based composite coating comprises the following components in percentage by mass: 5-6.5% of Mo, SiC: 0.1-0.3%, AlN 0.2-0.5%, MoS2: 3~4.2%，CaF 21 to 1.5 percent, and the balance of Cu.
(2) Installing a positioning system on a rack of a titanium welded pipe 2 production line;
after the welding position is determined, the four positioning columns, the front baffle 18 and the rear baffle 20 are installed and fixed on a rack of a titanium welded pipe 2 production line.
(3) Placing the device body 1 in the positioning system and tensioning it with a spring
(4) The side baffle 19 is adjusted by a fine adjustment knob 24 until the sliding cavity surface 3 of the device body 1 is completely attached to the titanium welded pipe 2, and then the side baffle 19 is clamped by a clamping knob 25
When the central line of the sliding cavity surface 3 at the bottom of the device body 1 is coincident with the central line of the titanium welded tube 2, the sliding cavity surface 3 of the device body 1 is completely attached to the titanium welded tube 2.
(5) The water inlet pipe 8, the water outlet pipe 10 and the air inlet pipe 12 are connected, and the welding gun 6 is installed.
When the welding gun 6 is installed, the tungsten electrode of the welding gun 6 is aligned to the center of a straight seam to be welded of the titanium welding pipe 2, and the distance between the nozzle of the welding gun 6 and the titanium welding pipe is 2-5 mm;
(6) the heat exchanger 11 is started and the cooling water starts to circulate
(7) Feeding protective gas with flow rate of 10-12L/min;
(8) starting the titanium welded pipe 2 production line to start welding
In the welding process, the welding process is observed through the observation window 7, and if abnormity occurs, the welding process is timely adjusted until the welding process is stable.
(9) The heat exchanger 11 is adjusted so that the temperature of the outlet water is not higher than 24 deg.c, preferably lower than 24 deg.c.
Before the welding protection device is adopted, the metal temperature of the welding seam 22 just after the titanium welding pipe 2 is separated from the protective cover fluctuates between 413 ℃ and 426 ℃, and the temperature of the welding heat affected zone 21 close to the metal of the welding seam 22 fluctuates between 390 ℃ and 402 ℃. The limit expansion rate of the titanium welded pipe 2 is 13-15%.
After the automatic straight seam welding protection device for the titanium welded pipe 2 is adopted, the metal temperature of the welding seam 22 just after the titanium welded pipe 2 is separated from the device body 1 fluctuates between 237 and 242 ℃, and the temperature of the welding heat affected zone 21 close to the metal of the welding seam 22 fluctuates between 195 and 208 ℃. The ultimate bulging rate of the titanium welded pipe 2 is increased to 22-25%. The titanium welded pipe 2 of 2000 m is continuously produced, and the self-lubricating heat-resistant wear-resistant copper-based composite coating 4 on the sliding cavity surface 3 at the bottom of the device body 1 has no obvious abrasion.
The invention shows that after the automatic straight seam welding protection device for the titanium welded pipe 2 is utilized, the ultimate bulging rate for representing the ductility and toughness of the titanium welded pipe 2 is greatly improved, which mainly benefits from two aspects: (1) when the welded straight seam of the titanium welded pipe 2 is positioned in the protective area of the sliding cavity surface 3 of the device, due to the special gas protection system of the device, air is completely prevented from entering the protective area, the metal of the welding seam 22 of the straight seam of the titanium welded pipe 2 and the welding heat affected area 21 are better protected in a high-temperature time period after welding, and embrittlement caused by air pollution is avoided, so that the plastic toughness of the straight seam of the titanium welded pipe 2 is improved; (2) due to the rapid cooling effect of the device, when the metal of the welding seam 22 of the straight seam of the titanium welding pipe 2 and the welding heat affected zone 21 are just separated from the protection of the sliding cavity surface 3 of the device body 1, the temperature is reduced to below 300 ℃, hydrogen, oxygen and nitrogen in the air are not absorbed any more, the embrittlement is avoided, and the plasticity and toughness of the straight seam of the titanium welding pipe 2 are further improved.
The welding protection device of the embodiment is also suitable for high-quality protection of the metal and welding heat affected zone 21 of the welding seam 22 in the automatic welding process of other welded pipes made of other materials, such as stainless steel welded pipes, nickel-based alloy welded pipes, high-alloy steel welded pipes and the like, according to the use requirements and the environment.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the content of the embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and any changes and modifications made are within the protective scope of the present invention.
Claims (10)
1. The utility model provides a titanium welded pipe straight seam automatic weld protection device which characterized in that: the device comprises a device body, a positioning system for positioning the device body, a cooling system for cooling the titanium welded pipe and a gas protection system for protecting the titanium welded pipe;
the device body is provided with a sliding cavity surface which is used for being in sliding connection with the outer surface of the titanium welding pipe, and the sliding cavity surface is adapted to the outer surface of the titanium welding pipe;
the cooling system comprises a cooling channel arranged in the device body, and a water inlet pipe and a water outlet pipe which are communicated with the cooling channel;
the gas protection system comprises a groove and a gas inlet pipe, wherein the groove and the gas inlet pipe are arranged on the sliding cavity surface and used for flowing protection gas, and the gas inlet pipe guides the protection gas to the groove.
2. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 1, characterized in that: the groove includes welding seam protection gas groove, heat affected zone protection gas groove, air vent and goes out the air duct, welding seam protection gas groove, heat affected zone protection gas groove all vertically set up in on the sliding cavity face, vertically be with titanium welded tube axial direction parallel's direction, the air vent intercommunication welding seam protection gas groove and heat affected zone protection gas groove, heat affected zone protection gas groove set up in the week side in welding seam protection gas groove, welding seam protection gas groove connects the intake pipe, heat affected zone protection gas groove is connected with out the air duct, and protective gas passes through the intake pipe gets into welding seam protection gas groove, through go out the air duct outflow.
3. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 2, characterized in that: the heat affected zone protective gas groove is communicated with the welding seam protective gas groove through a plurality of vent grooves and is communicated with the outside through a plurality of gas outlet grooves; the vent groove and the air outlet groove are respectively arranged transversely and are arranged in a staggered manner, and the transverse direction is vertical to the longitudinal direction.
4. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 2, characterized in that: the welding seam protection gas groove, the heat affected zone protection gas groove, the vent groove and the gas outlet groove are all formed by grooves formed in the sliding cavity surface, and the groove depth of the welding seam protection gas groove is larger than that of the heat affected zone protection gas groove, the vent groove and the gas outlet groove.
5. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 2, characterized in that: the gas inlet pipe is communicated with the welding seam protection gas groove, and protection gas firstly enters the welding seam protection gas groove through the gas inlet pipe.
6. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 1, characterized in that: the sliding cavity surface is coated with a 0.5-1.5 mm self-lubricating heat-resistant wear-resistant copper-based composite coating, and the coating comprises the following components in percentage by mass: 5-6.5% of Mo, SiC: 0.1-0.3%, AlN 0.2-0.5%, MoS2: 3~4.2%，CaF21 to 1.5 percent, and the balance of Cu.
7. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 1, characterized in that: the positioning system comprises a spring tensioning mechanism for elastically fixing the device body, a front baffle and a rear baffle which are fixed on the production line rack, and a transverse positioning mechanism for adjusting the position of the device body; the transverse positioning mechanism comprises a cross beam and side baffles arranged at two ends of the cross beam, a rack is arranged on the cross beam, an adjusting knob is arranged on the front baffle, the adjusting knob is meshed with the rack through a gear and rotates, and the gear drives the side baffles to move through the rack.
8. The automatic welding protection device for the straight seam of the titanium welded pipe according to claim 1, characterized in that: the sliding cavity surface is concave, and the cross section comprises an arc shape, a rectangle and a polygon.
9. The use method of the automatic straight seam welding protection device for the titanium welded pipe based on the claim 1 is characterized in that: comprises the following steps
(1) Selecting a proper device body according to the size of the titanium welded pipe;
(2) installing a positioning system on a rack of a titanium welded pipe production line;
(3) placing the device body in a positioning system and tensioning by using a spring;
(4) adjusting the side baffle plate by using a fine adjustment knob until the sliding cavity surface of the device body is completely attached to the titanium welded pipe, and then clamping the side baffle plate by using a clamping knob;
(5) a water inlet pipe, a water outlet pipe and an air inlet pipe are connected, and a welding gun is installed;
(6) starting the heat exchanger, and starting the circulation of cooling water;
(7) feeding protective gas with flow rate of 10-12L/min;
(8) starting a titanium welded pipe production line to start welding;
(9) the heat exchanger is adjusted to ensure that the temperature of the outlet water is not higher than 24 ℃.
10. The use method of the automatic straight seam welding protection device for the titanium welded pipe according to claim 8 is characterized in that: the step (1): the width of the device body is 0.75-0.9 times of the diameter of the titanium welding pipe, and the length is 250-300 mm.
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