CN112171199A - Welding process for stainless steel pipe fitting - Google Patents
Welding process for stainless steel pipe fitting Download PDFInfo
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- CN112171199A CN112171199A CN202011025014.0A CN202011025014A CN112171199A CN 112171199 A CN112171199 A CN 112171199A CN 202011025014 A CN202011025014 A CN 202011025014A CN 112171199 A CN112171199 A CN 112171199A
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- formed part
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a welding process for stainless steel pipes, which comprises the following steps: s1, manufacturing a threaded piece; s2, extruding a formed part, and processing a thin-walled tube by using an extrusion forming machine to form the formed part with one end closed up; s3, preheating, namely heating the threaded part and the formed part to 500 ℃ by means of a heater; s4, vacuum sealing, namely clamping the threaded part at the rotating end of a welding machine, clamping the formed part at the moving end of the welding machine, forming a closed space by means of a housing, and vacuumizing the closed space; s5, friction welding, namely driving a threaded part to rotate at a high speed by means of a motor, simultaneously gradually drawing the formed part towards the threaded part under the action of axial force of an oil cylinder piston, and keeping for 6s after the threaded part is contacted with the formed part and is tightly pressed; s6, upsetting, braking, and rapidly increasing the axial force to the set upsetting pressure of 3.0-4.0 MPa/mm2 for upsetting, wherein the upsetting pressure maintaining time is 1-5 seconds. By means of the cooperation of friction welding, preheating and vacuum welding, the high-quality welding of the stainless steel pipe fitting is realized.
Description
Technical Field
The invention relates to the processing of stainless steel pipes, in particular to a welding process for stainless steel pipes.
Background
The existing welded stainless steel clamping and pressing type pipe fitting products are all welded by argon arc. In the book "forming process of stainless steel card pressing type pipe fitting" of year 6 of "metal forming process" of dayrevere, zhao army, Zhao, a forming process of three-way thin-wall stainless steel card pressing type pipe fitting is introduced, which comprises: blanking, extruding a tee joint, cutting a cap, flattening, forming an end part, welding, processing a welding line and processing the surface.
And the welding adopts argon arc welding without adding wires. The basic process is that the mouth parts of two parts to be welded are aligned, and two points are spot-welded in the 180-degree circumferential direction at the joint of the outer diameter, so that the two parts are combined together. And then clamping the outlet part to make the outlet part rotate at a constant speed by 360 degrees, ensuring that the rotation axis coincides with the axis of the circumferential surface of the welding opening, and fixing the welding gun to ensure that the distance from the gun tip to the welding seam is constant, and the distance is generally 2-4 mm. The circumferential corner formed from the arc starting point to the arc extinguishing point of the welding is generally larger than 360 degrees so as to ensure the welding of the starting point and the tail point of the welding line to be complete. The circumferential line speed of welding is generally not more than 5m/min, the welding current is 40-80A, the argon flow is required to ensure that the welding line is silvery white, the welding line is required to be rapidly cooled, and the shorter the time of the welding line at 450-850 ℃, the better the welding line is, so as to avoid intergranular corrosion.
As shown in fig. 1, the stainless steel clamping and pressing type pipe product with threads is also used for connecting a precision cast threaded part 1 and a thin-wall pipe forming part 2 by argon arc welding. During argon arc welding, the welding time is long, the high-temperature retention time of a welding line and a near seam area is long, and the cooling speed is slow. The weld region has microscopic chemical composition segregation. The heat affected zone with the peak temperature of 600-1000 ℃ belongs to the sensitized zone of the welded joint under the action of welding heat circulation, and because the precipitation of carbide Cr23C6 is formed along the grain boundary, the intergranular corrosion of the sensitized zone is easy to generate under the action of a corrosive medium, so the heat affected zone cannot be used in the occasions with severe environment or corrosive liquid conveying. The quality of the argon arc welding joint is easily affected by welding process, welding equipment, gas protection and welding worker technology.
Disclosure of Invention
The invention aims to provide a welding process for stainless steel pipes, which has the effect of high welding quality.
In order to achieve the technical purpose, the invention provides the following technical scheme: a welding process for stainless steel tubing comprising the steps of:
s1, manufacturing a threaded part, and processing the threaded part by using a precision casting process;
s2, extruding a formed part, and processing a thin-walled tube by using an extrusion forming machine to form the formed part with one end closed up;
s3, preheating, namely heating the threaded part and the formed part to 500 ℃ by means of a heater;
s4, vacuum sealing, namely clamping the threaded part at the rotating end of a welding machine, clamping the formed part at the moving end of the welding machine, forming a sealed space outside the rotating end and the moving end by virtue of a housing, and vacuumizing the sealed space;
s5, friction welding, namely driving a threaded part to rotate at a high speed by means of a motor, simultaneously enabling the formed part to gradually approach the threaded part under the action of axial force of an oil cylinder piston, forming a friction interface on a contact surface of the threaded part and the formed part after the threaded part is contacted and pressed with the formed part, maintaining the axial force of 1.0-2.0 MPa/mm2, rotating the speed of 1000-2000 r/min and maintaining the speed for 6 s;
s6, upsetting, braking, rapidly increasing the axial force to the set upsetting pressure of 3.0-4.0 MPa/mm2 for upsetting, maintaining the upsetting pressure for pressure maintaining for 1-5 seconds;
and S7, blanking, loosening the threaded part at the rotating end, retreating the moving end to reset, taking down the processed pipe fitting, and re-clamping the preheated pipe fitting at the rotating end and the moving end to start the next processing.
By adopting the technical scheme, along with the conduction of friction heat to the threaded part and the formed part, the temperature of two sides of the friction interface of the threaded part and the formed part is gradually increased, and a welding area distributed on two sides of the friction interface is formed; and then braking, rapidly increasing the axial force to the set upsetting pressure of 1.5-5 MPa/mm2 for upsetting, maintaining the upsetting pressure for pressure maintaining for 1-5 seconds, wherein during the upsetting process and the pressure maintaining process after upsetting, metals in a welding area are mutually diffused and recrystallized to firmly weld the metals at two sides of the welding area together, so that the whole welding process is completed, friction welding is solid welding, and the metals in the welding area are in a forging structure, so that welding defects related to melting and solidification metallurgy cannot be generated. Before friction welding, the formed part and the threaded part are preheated, and simultaneously, when friction is performed, vacuum is formed around the pipe fitting, so that heat is prevented from losing as much as possible, most of the heat is locked on the pipe fitting, the time for forming a welding area by friction of the pipe fitting is shortened, the overlong time for friction upsetting of the pipe fitting is avoided, the tissue density of the pipe fitting welding area is large, a stress fault is formed with adjacent areas, the mechanical strength outside the welding area of the pipe fitting is low, the improvement of welding quality is realized, the yield is improved, the deformation of a welding part is also reduced, and the length tolerance and the coaxiality are controlled within 0.1 mm.
Preferably, in S3, at least 3 sets of the molding member and the screw member are stored in the heater.
By adopting the technical scheme, time intervals can exist between the processing of the threaded part and the formed part and the friction welding, and meanwhile, a plurality of sets of threaded parts and the formed part can be processed by a plurality of devices simultaneously, so that the processing efficiency of the welding process is ensured.
Preferably, in S4, S5, S6 and S7, the screw, the molding member and the processed pipe are moved by a robot.
Through adopting above-mentioned technical scheme, replace manual operation with the help of the manipulator, avoid the people to contact high temperature work piece, also improved work efficiency simultaneously.
Preferably, the housing in S4 includes left casing and right casing, left casing is fixed at the rotation end, right casing is fixed at the removal end, the breach that supplies the screw member to put into is seted up to the upper surface of left casing, the upper surface of right casing extends the arch that is used for sealing left casing breach, the breach that supplies the formed part to rise is seted up to the lower surface of right casing, the lower surface of left casing extends the arch that is used for sealing right casing breach, the rotation end is provided with the vacuum pump of the left casing of intercommunication outward.
Through adopting above-mentioned technical scheme, with the help of the breach of left casing and right casing, do not influence screw member and formed part business turn over casing, guaranteed the leakproofness and the production normal clear of casing.
In summary, the present invention achieves the following effects:
1. the high-quality welding of the stainless steel pipe fitting is realized by the cooperation of friction welding, preheating and vacuum welding;
2. by means of the matching of the left shell and the right shell, the flexible sealing of the stainless steel pipe fitting is realized.
Drawings
Fig. 1 is a schematic view for showing a molded article and a screw member to be processed in this embodiment.
In the figure, 1, a screw element; 2. and (4) forming the part.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example (b): a welding process for stainless steel tubing comprising the steps of:
s1, manufacturing a threaded part 1, and processing the threaded part 1 by using a precision casting process;
s2, extruding the formed part 2, and processing a thin-walled tube by using an extrusion forming machine to form the formed part 2 with one end closed up;
s3, preheating, namely heating the threaded part 1 and the formed part 2 to 500 ℃ by means of a heater;
s4, vacuum sealing, namely clamping the threaded part 1 at the rotating end of a welding machine, clamping the formed part 2 at the moving end of the welding machine, forming a sealed space outside the rotating end and the moving end by virtue of a housing, and vacuumizing the sealed space;
s5, friction welding, namely driving the threaded part 1 to rotate at a high speed by means of a motor, simultaneously enabling the formed part 2 to gradually approach the threaded part 1 under the action of axial force of an oil cylinder piston, forming a friction interface on a contact surface of the threaded part 1 and the formed part 2 after the threaded part 1 is contacted and pressed with the formed part 2, maintaining the axial force of 1.0-2.0 MPa/mm2, rotating speed of 1000-2000 revolutions per minute and maintaining the rotation speed for 6 s;
s6, upsetting, braking, rapidly increasing the axial force to the set upsetting pressure of 3.0-4.0 MPa/mm2 for upsetting, maintaining the upsetting pressure for pressure maintaining for 1-5 seconds;
s7, blanking, loosening the threaded part 1 at the rotating end, retreating and resetting the moving end, taking down the processed pipe fitting, re-clamping the preheated pipe fitting at the rotating end and the moving end, and starting to process next time.
Along with the conduction of the friction heat to the threaded part 1 and the formed part 2, the temperature of two sides of the friction interface of the threaded part 1 and the formed part 2 is gradually increased, and a welding area distributed on two sides of the friction interface is formed; and then braking, rapidly raising the axial force to the set upsetting pressure of 3.0-4.0 MPa/mm2 for upsetting, maintaining the upsetting pressure for pressure maintaining for 1-5 seconds, wherein during the upsetting process and the pressure maintaining process after upsetting, metals in a welding area are mutually diffused and recrystallized to firmly weld the metals at two sides of the welding area together, so that the whole welding process is completed, the friction welding is solid welding, and the metals in the welding area are in a forging structure, so that welding defects related to melting and solidification metallurgy cannot be generated. Before friction welding, the formed part 2 and the threaded part 1 are preheated, meanwhile, when friction is performed, vacuum is formed around the pipe fitting, heat is guaranteed not to be lost as far as possible, most of the heat is locked on the pipe fitting, the time for forming a welding area through friction of the pipe fitting is shortened, the phenomenon that the pipe fitting is excessively long in friction upsetting time is avoided, the structure density of the pipe fitting welding area is large, a stress fault is formed between the pipe fitting welding area and an adjacent area, the mechanical strength outside the pipe fitting welding area is low, the improvement of welding quality is achieved, the yield is improved, the deformation of the welding position is also reduced, and the length tolerance and the coaxiality are controlled within 0.1 mm.
At S3, the heater stores at least 3 sets of the molding member 2 and the screw member 1. The processing of screw member 1 and formed part 2 can have time interval with friction welding, also can many equipment simultaneous processing multiunit screw member 1 and formed part 2 simultaneously, has guaranteed welding process's machining efficiency.
In S4, S5, S6 and S7, the screw 1, the molding member 2 and the processed pipe are moved by a robot. The manipulator replaces manual operation, so that a person is prevented from contacting a high-temperature workpiece, and the working efficiency is improved.
Housing in S4 includes left casing and right casing, and left casing is fixed at the rotation end, and right casing is fixed at the removal end, and the breach that supplies screw member 1 to put into is seted up to the upper surface of left casing, and the upper surface of right casing extends has the arch that is used for sealing left casing breach, and the breach that supplies formed part 2 to rise is seted up to the lower surface of right casing, and the lower surface of left casing extends has the arch that is used for sealing right casing breach, and the rotation end is provided with the vacuum pump of the left casing of intercommunication outward. With the help of the breach of left casing and right casing, do not influence screw member 1 and forming part 2 business turn over casing, guaranteed the leakproofness and the production normal clear of casing.
Claims (4)
1. A welding process for stainless steel pipe fittings, characterized by comprising the steps of:
s1, manufacturing a threaded part (1), and processing the threaded part (1) by using a precision casting process;
s2, extruding a formed part (2), and processing a thin-walled tube by using an extrusion forming machine to form the formed part (2) with one end closed up;
s3, preheating, namely heating the threaded part (1) and the formed part (2) to 500 ℃ by means of a heater;
s4, vacuum sealing, namely clamping the threaded part (1) at the rotating end of a welding machine, clamping the formed part (2) at the moving end of the welding machine, forming a closed space outside the rotating end and the moving end by virtue of a housing, and vacuumizing the closed space;
s5, friction welding, namely driving the threaded part (1) to rotate at a high speed by means of a motor, simultaneously enabling the formed part (2) to gradually approach to the threaded part (1) under the action of axial force of an oil cylinder piston, forming a friction interface on a contact surface of the threaded part (1) and the formed part (2) after the threaded part (1) is contacted and pressed with the formed part (2), maintaining the axial force at 1.0-2.0 MPa/mm2, rotating at 1000-2000 rpm, and maintaining the rotation speed at 6 s;
s6, upsetting, braking, rapidly increasing the axial force to the set upsetting pressure of 3.0-4.0 MPa/mm2 for upsetting, maintaining the upsetting pressure for pressure maintaining for 1-5 seconds;
s7, blanking, loosening the threaded part (1) at the rotating end, retreating and resetting the moving end, taking down the processed pipe fitting, re-clamping the preheated pipe fitting at the rotating end and the moving end, and starting to process next time.
2. A welding process for stainless steel tubing according to claim 1, wherein: in the step S3, at least 3 sets of the molding member (2) and the screw member (1) are stored in the heater.
3. A welding process for stainless steel pipes according to claim 2, characterized in that: in the S4, S5, S6 and S7, the screw (1), the molding member (2) and the processed pipe are moved by a robot.
4. A welding process for stainless steel tubing according to claim 3, wherein: housing in S4 includes left casing and right casing, left side casing is fixed at the rotation end, right side casing is fixed at the removal end, the breach that supplies screw member (1) to put into is seted up to the upper surface of left side casing, the upper surface of right side casing extends has the arch that is used for sealing left casing breach, the breach that supplies formed part (2) to rise is seted up to the lower surface of right side casing, the lower surface of left side casing extends has the arch that is used for sealing right casing breach, the rotation end is provided with the vacuum pump of the left casing of intercommunication outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011025014.0A CN112171199A (en) | 2020-09-25 | 2020-09-25 | Welding process for stainless steel pipe fitting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011025014.0A CN112171199A (en) | 2020-09-25 | 2020-09-25 | Welding process for stainless steel pipe fitting |
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| CN112171199A true CN112171199A (en) | 2021-01-05 |
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| CN202011025014.0A Pending CN112171199A (en) | 2020-09-25 | 2020-09-25 | Welding process for stainless steel pipe fitting |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004108341A2 (en) * | 2003-06-10 | 2004-12-16 | Noetic Engineering Inc. | Method of induction weld forming with shear displacement step |
| CN1945089A (en) * | 2006-10-20 | 2007-04-11 | 无锡金羊管件有限公司 | Method for producing clip press type pipe |
| CN2894918Y (en) * | 2006-03-06 | 2007-05-02 | 日扬科技股份有限公司 | Vacuum friction welding machine |
| CN106356159A (en) * | 2016-09-26 | 2017-01-25 | 麦克奥迪（厦门）电气股份有限公司 | Insulating sleeve for medium-high voltage connection and manufacturing method thereof |
| CN108907447A (en) * | 2018-07-09 | 2018-11-30 | 山东大学 | The axial rub welding technique of high-nitrogen austenitic stainless steel and non magnetic drill collar |
| CN108942114A (en) * | 2018-08-29 | 2018-12-07 | 江苏长龄液压股份有限公司 | A kind of production method of tensioning apparatus oil cylinder |
| CN210524214U (en) * | 2019-09-23 | 2020-05-15 | 上海威特力热管散热器有限公司 | Automatic packaging equipment for heat pipe |
-
2020
- 2020-09-25 CN CN202011025014.0A patent/CN112171199A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004108341A2 (en) * | 2003-06-10 | 2004-12-16 | Noetic Engineering Inc. | Method of induction weld forming with shear displacement step |
| CN2894918Y (en) * | 2006-03-06 | 2007-05-02 | 日扬科技股份有限公司 | Vacuum friction welding machine |
| CN1945089A (en) * | 2006-10-20 | 2007-04-11 | 无锡金羊管件有限公司 | Method for producing clip press type pipe |
| CN106356159A (en) * | 2016-09-26 | 2017-01-25 | 麦克奥迪（厦门）电气股份有限公司 | Insulating sleeve for medium-high voltage connection and manufacturing method thereof |
| CN108907447A (en) * | 2018-07-09 | 2018-11-30 | 山东大学 | The axial rub welding technique of high-nitrogen austenitic stainless steel and non magnetic drill collar |
| CN108942114A (en) * | 2018-08-29 | 2018-12-07 | 江苏长龄液压股份有限公司 | A kind of production method of tensioning apparatus oil cylinder |
| CN210524214U (en) * | 2019-09-23 | 2020-05-15 | 上海威特力热管散热器有限公司 | Automatic packaging equipment for heat pipe |
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Application publication date: 20210105 |
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