CN115922042B - Preheating flash butt welding method - Google Patents
Preheating flash butt welding method Download PDFInfo
- Publication number
- CN115922042B CN115922042B CN202310079790.6A CN202310079790A CN115922042B CN 115922042 B CN115922042 B CN 115922042B CN 202310079790 A CN202310079790 A CN 202310079790A CN 115922042 B CN115922042 B CN 115922042B
- Authority
- CN
- China
- Prior art keywords
- stage
- flash
- clamp
- moving
- flashing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a preheating flash butt welding method, which comprises a clamping stage, a flash stage, a preheating stage, a continuous flash stage, an upsetting stage and a resetting stage, wherein the flash stage, the preheating stage and the continuous flash stage control a brake clamp to advance and retreat according to the relation of welding current and threshold current; in the flash stage, a flash starting point is determined according to the distance between a dynamic clamp and a static clamp when the welding current is larger than a threshold current for the first time in the stage, and a continuous flash starting point in a continuous flash stage is determined in the same way. The invention can automatically judge the flashing starting point, realize flashing more accurately and avoid the waste of materials; the preheating stage is realized by controlling the advance and retreat of the brake clamp and the additional preheating compression amount according to the relation between the welding current and the threshold current, so that the preheating is stable and the material consumption is low; the advancing speed of the continuous flashing stage is in direct proportion to the flashing distance, the effect of accelerating flashing is generated, and the device has the advantages of fast energy accumulation, difficult interruption of flashing and small material consumption, and ensures that the optimal flashing speed is reached to the end stage of flashing.
Description
Technical Field
The invention relates to a machining technology, in particular to a preheating flash butt welding method.
Background
The marine anchor chain and the mooring anchor chain are chains for connecting the anchors and the ship body or ocean engineering equipment, and along with the increase of the ocean resource demand of countries around the world and the damage of severe sea conditions such as earthquakes frequently occurring in tsunamis, hurricanes and sea areas and natural weather to ocean resource exploration and oil extraction facilities and mooring units in recent years, the demand of the high-level mooring chain for ocean engineering is continuously increased. With the development of the ocean, the new ocean platform and relevant ocean engineering structures and other mooring units are put into operation, and the demand of the new ocean platform and relevant ocean engineering structures is increased as a high-level mooring chain of a safety guarantee component which is indispensable to a fixing device of an ocean oil extraction and mining device.
Chinese patent 201080048430.0 discloses a flash butt welding method of rail steel, which controls the heat influence width of the welding joint head below 27mm by prescribing the current flowing time in the preheating procedure so as not to greatly influence the structural performance of the rail in the follow-up. Chinese patent 201910407841.7 discloses a flash butt welding connection method for cemented carbide blades by contacting and separating the workpiece ports a plurality of times and limiting the energizing time each time until the ports are heated to a nominal temperature when pre-welding; during intermittent flash butt welding, the initial speed and the acceleration of the movable clamp are set to make the movable clamp perform acceleration feeding movement, and the upsetting speed is adopted after the preset flash amount is reached. However, the preheating stage is not regulated and controlled according to actual working conditions, such as floating of threshold current, and the preheating process is uncontrollable, so that the flashing stage is interrupted due to insufficient temperature when the flashing process is performed, the subsequent flashing stage and preheating are alternately performed, and the burning length is uncontrollable. The acceleration phase of the flash is not controlled in combination with the actual burn-in conditions, which can easily affect the quality of the welded joint.
Disclosure of Invention
The invention aims to: the invention aims to provide a preheating flash butt welding method which is regulated and controlled according to actual working conditions.
The technical scheme is as follows: the invention relates to a preheating flash butt welding method, which comprises a clamping stage, a flash stage, a preheating stage, a continuous flash stage, an upsetting stage and a resetting stage, wherein the flash stage, the preheating stage and the continuous flash stage control a brake clamp to advance and retreat according to the relation between welding current I and threshold current I; in the flash stage, a flash starting point is determined according to the distance between a dynamic clamp and a static clamp when the welding current is larger than a threshold current for the first time in the stage, and a continuous flash starting point in a continuous flash stage is determined in the same way.
Further, the flash stage comprises the following steps:
(2.1) energizing the electrode;
(2.2) judging a flash starting point: moving the clamp v 0 Until the first welding current I > I, stopping the moving clamp, determining the flash starting point, and making the moving-static clamp distance l 'at the flash starting point' 0 ＝l；
(2.3) when I > I, moving the clamp by-v 0 Is retreated until I is less than or equal to I; when I is less than or equal to I, the moving clamp is v 0 Is flattened until I > I;
(2.4) judging the flash distance, if the current dynamic-static clamp distance l is larger than l' 0 -L a Returning to step (2.3), otherwise ending the flash stage, wherein L a Is a flash length.
Further, the preheating stage includes the following steps:
(3.1)n＝0；
(3.2) moving the jig in v 1 Is advanced until I > I, continue with v 1 Is advanced by the pre-heat compression amount deltap,
the end surfaces of the two workpieces to be welded are in closer contact;
(3.3) moving the jig to stop t 1 Time;
(3.4) moving the jig at-v 1 Is retreated until I is less than or equal to I;
(3.5) moving the jig to stop t 2 Time;
(3.6) n: if N < N, return (3.2), otherwise the warm-up phase ends, where N is the nominal warm-up number.
Further, the continuous flashing stage comprises the following steps:
(4.1) judging the starting point of continuous flashing: moving the clamp v 3 Until I > I, stopping the moving clamp, determining the starting point of continuous flash, and making the moving-static clamp distance l 'at the starting point of continuous flash' 1 ＝l；
(4.2) when I > I, moving the jigIs retreated until I is less than or equal to I; when I is less than or equal to I, the movable clampWith->Continuously flashing until I > I;
(4.3) determining the continuous flash distance if l > l' 1 -L b +L′ b Return (4.2); if l is less than or equal to l' 1 -L b +L′ b Moving the clamp v 3 The speed of (2) is advanced at a constant speed until l is less than or equal to l' 1 -L b Stopping the movable clamp, and ending the continuous flashing stage; wherein L is b To burn length, L' b Is the shortest continuous flash length.
Further, the upsetting stage includes the steps of:
(5.1) let t=0, initial distance l 'of dynamic-static jig at the beginning of upsetting' 2 ＝l；
(5.2) moving the jig in v 4 Is subjected to live upsetting, at which time the current time t is recorded continuously until t is more than or equal to t u Wherein t is u Is the live upsetting time;
(5.3) cutting off the welding current;
(5.4) moving the jig in v 4 The speed of (2) proceeds to l' 2 -L c Where L is c Is the upsetting length;
(5.5) dynamic jig is maintained at l' 2 -L c Is stationary and hold t m Time, t m For upset hold time.
Further, the reset phase includes the following steps:
(6.1) loosening the movable clamp and the static clamp;
(6.2) the movable clamp retreats to the initial position, and the welding process is finished.
The beneficial effects are that: compared with the prior art, the invention has the remarkable advantages that: 1. according to the electrode position of the first welding current larger than the gate line current in the flash stage, the flash starting point can be automatically judged, the flash can be realized more accurately, and the waste of materials is avoided; 2. the preheating stage is realized by controlling the advance and retreat of the brake clamp and the additional preheating compression amount according to the relation between the welding current I and the threshold current I, and has the advantages of stable preheating and low material consumption; 3. the advancing speed of the continuous flashing stage is in direct proportion to the flashing distance, so that the effect of accelerating flashing is generated, the device has the advantages of fast energy accumulation, difficult interruption of flashing and small material consumption, and can ensure that the optimal flashing speed is reached to the final stage of flashing; 4. the invention can automatically identify the welding starting position and ensure the consistency of the length after welding; 5. the invention avoids the problems of uneven heating and discontinuous flashing caused by uneven or unaligned end face of the workpiece to be welded through the flashing stage; 6. the consistency of input energy is improved through the preheating stage with controllable times, the loss of materials is reduced, and the continuous follow-up continuous flashing is ensured.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a graph of typical electrode position signals during a pre-heat flash butt welding process;
FIG. 3 is a graph of typical current signals during a preheat flash butt welding process;
in the figure: s 1-advancing, s 2-heating, s 3-retreating, s 4-balancing, s 5-electric upsetting and s 6-electroless upsetting.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a preheating flash butt welding method, which comprises the following welding parameters: welding current i, current distance l of dynamic-static clamp, initial distance l 'of dynamic-static clamp at beginning of flash' 0 The current preheating times n, the initial distance l 'of the dynamic-static clamp at the beginning of flashing' 1 Initial distance l 'of dynamic-static clamp at the beginning of upsetting' 2 The current time t. The welding process parameters are set as follows: threshold current i=450a, initial distance of dynamic-static clamp l 0 Flash speed v =80 mm 0 =1 mm/s, flash length L a =3mm, preheat speed v 1 10mm/s, rated number of preheating times n=9 times, preheating compression amount Δp=0.5 mm, heating time t 1 Time of cooling t =2s 2 =1s, flash initial velocity v 2 Flash end speed v =0.4 mm/s 3 ＝2mm/sBurn length L b =12 mm, shortest continuous flash length L' b Electrified upsetting time t =2 mm u Upsetting hold time t=0.2 s m Tip speed v =30s 4 Length of upsetting L=35 mm/s c ＝15mm。
The method comprises the following specific steps:
(1) Clamping: the pairs of weldments are respectively clamped at a distance l 0 And (80 mm) in the movable clamp and the static clamp, and monitoring the current distance l of the movable clamp and the static clamp and the welding current i in the welding process in real time.
(2) Flash stage:
(2.1) energizing the electrode;
(2.2) judging a flash starting point: moving the clamp v 0 (1 mm/s) until the first welding current I > I (450A), the movable clamp is stopped, the flash starting point is determined, and the movable-static clamp distance l 'at the start of flash is set at the moment' 0 ＝l；
(2.3) when I > I (450A), moving the clamp at-v 0 (-1 mm/s) back until i.ltoreq.I (450A); when I is less than or equal to I (450A), the moving clamp moves by v 0 (1 mm/s) the speed progression begins to flash flat until I > I (450A);
(2.4) judging the flash distance, if the current dynamic-static clamp distance l is larger than l' 0 -3mm, then return to step (2.3), otherwise the flash phase ends.
(3) Preheating:
(3.1)n＝0；
(3.2) moving the jig in v 1 The feed motion is carried out at a speed of (10 mm/s) until I > I (450A) continues at v 1 A speed advance Δp (0.5 mm) of (10 mm/s) to bring the two work-piece end surfaces to be welded into closer contact, as shown by s1 in fig. 2;
(3.3) moving the jig to stop t 1 (2 s) time, as shown by s2 in FIG. 2;
(3.4) moving the jig at-v 1 (-10 mm/s) back until i.ltoreq.I (450A), as shown by s3 in FIG. 2;
(3.5) moving the jig to stop t 2 (1 s) time, as shown by s4 in FIG. 2;
(3.6) n: if N < N (9), return (3.2) is made, whereas the warm-up phase ends.
(4) Continuous flashing phase:
(4.1) judging the starting point of continuous flashing: moving the clamp v 3 The feeding motion is carried out at the speed of (2 mm/s) until I is more than I (450A), the movable clamp is stopped, the starting point of continuous flashing is determined, and the initial distance l 'of the movable clamp and the static clamp is set at the starting point of continuous flashing' 1 ＝l；
(4.2) when I > I (450A), the jig is moved by- [0.16× (l-l ]' 1 )+0.4]The speed of mm/s is retreated until I is less than or equal to I (450A); when I is less than or equal to I (450A), the movable clamp is used for carrying out the operation of [0.16× (l-l ]' 1 )+0.4]The speed of mm/s advances to continuously flash until I > I (450A);
(4.3) determining the continuous flash distance if l > l' 1 -10mm, return (4.2); if l is less than or equal to l' 1 -10mm, moving clamp v 3 The uniform feeding motion is carried out at the speed of (2 mm/s) until l is less than or equal to l' 1 -12mm, the moving clamp is stopped and the continuous flashing phase is ended.
(5) Upsetting:
(5.1) let t=0, initial distance l 'of dynamic-static jig at the beginning of upsetting' 2 ＝l；
(5.2) moving the jig in v 4 (35 mm/s) in advance, and performing live upsetting, at which time the current time t is recorded continuously until t is not less than t u (0.2 s), as shown in s5 of FIG. 2;
(5.3) cutting off the welding current;
(5.4) moving the jig in v 4 The upsetting speed (35 mm/s) proceeds to l' 2 -15 mm;
(5.5) dynamic jig is maintained at l' 2 Immobilized at 15mm and kept at t m (30 s) as shown in s6 of FIG. 2.
(6) And (3) a reset stage:
(6.1) loosening the movable clamp and the static clamp;
(6.2) moving the clamp back to the initial distance l 0 (80 mm) the welding process ends.
Claims (2)
1. The preheating flash butt welding method is characterized by comprising a clamping stage, a flash stage, a preheating stage, a continuous flash stage, an upsetting stage and a resetting stage, wherein the flash stage, the preheating stage and the continuous flash stage control the braking clamp to advance and retreat according to the relation between welding current I and threshold current I; in the flash stage, determining a flash starting point according to the distance between a dynamic clamp and a static clamp when the welding current is larger than a threshold current for the first time in the stage, and determining a continuous flash starting point in a continuous flash stage in a similar manner;
the flash stage comprises the following steps:
(2.1) energizing the electrode;
(2.2) judging a flash starting point: moving the clamp v 0 Until the first welding current I > I, stopping the moving clamp, determining the flash starting point, and making the moving-static clamp distance l 'at the flash starting point' 0 ＝l；
(2.3) when i>In the case of I, the dynamic clamp is at-v 0 Is retreated until I is less than or equal to I; when I is less than or equal to I, the moving clamp is v 0 Flash flat at speed of (c) until i>I；
(2.4) judging the flash distance, if the current dynamic-static clamp distance l is larger than l' 0 -L a Returning to step (2.3), otherwise ending the flash stage, wherein L a Is a flash length;
the preheating stage comprises the following steps:
(3.1)n＝0；
(3.2) moving the jig in v 1 Is advanced at a speed of i>I, continue with v 1 Is advanced by the pre-heat compression amount deltap,
the end surfaces of the two workpieces to be welded are in closer contact;
(3.3) moving the jig to stop t 1 Time;
(3.4) moving the jig at-v 1 Is retreated until I is less than or equal to I;
(3.5) moving the jig to stop t 2 Time;
(3.6) N =n+1, if N < N, returning to (3.2), otherwise ending the preheating stage, wherein N is the rated preheating frequency;
the continuous flashing phase comprises the following steps:
(4.1) judging the starting point of continuous flash: moving the clamp v 3 Is advanced at a speed of i>In the step I, the movable clamp is stopped, the starting point of continuous flashing is determined, and the distance l 'between the movable clamp and the static clamp is set at the moment of starting continuous flashing' 1 ＝l；
(4.2) when i>I, moving the clampIs retreated until I is less than or equal to I; when I is less than or equal to I, the movable clamp is in the form of +.>Is continuously flashing until i>I；
(4.3) determining the continuous flash distance if l > l' 1 -L b +L′ b Return (4.2); if l is less than or equal to l' 1 -L b +L′ b Moving the clamp v 3 The speed of (2) is advanced at a constant speed until l is less than or equal to l' 1 -L b Stopping the movable clamp, and ending the continuous flashing stage; wherein L is b To burn length, L' b Is the shortest continuous flash length;
the upsetting stage comprises the following steps:
(5.1) let t=0, initial distance l 'of dynamic-static jig at the beginning of upsetting' 2 ＝l；
(5.2) moving the jig in v 4 Is subjected to live upsetting, at which time the current time t is recorded continuously until t is more than or equal to t u Wherein t is u Is the live upsetting time;
(5.3) cutting off the welding current;
(5.4) moving the jig in v 4 The speed of (2) proceeds to l' 2 -L c Where L is c Is the upsetting length;
(5.5) dynamic jig is maintained at l' 2 -L c Is stationary and hold t m Time, t m For upset hold time.
2. The method of pre-heating flash butt welding according to claim 1, wherein the reset phase includes the steps of:
(6.1) loosening the movable clamp and the static clamp;
(6.2) the movable clamp retreats to the initial position, and the welding process is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310079790.6A CN115922042B (en) | 2023-01-31 | 2023-01-31 | Preheating flash butt welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310079790.6A CN115922042B (en) | 2023-01-31 | 2023-01-31 | Preheating flash butt welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115922042A CN115922042A (en) | 2023-04-07 |
| CN115922042B true CN115922042B (en) | 2023-07-21 |
Family
ID=86551009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310079790.6A Active CN115922042B (en) | 2023-01-31 | 2023-01-31 | Preheating flash butt welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115922042B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3435182A (en) * | 1965-08-19 | 1969-03-25 | Wuppermann Gmbh Theodor | Welding method |
| JPS4938855A (en) * | 1972-08-17 | 1974-04-11 | ||
| FR2795356A1 (en) * | 1999-06-23 | 2000-12-29 | Kvaerner Metals Clecim | SPARKING WELDING INSTALLATION |
| CN103894717A (en) * | 2012-12-31 | 2014-07-02 | 东风汽车车轮有限公司 | Preheating burnoff flash butt welding method for welding large-section steel vehicle wheels |
| CN107520529A (en) * | 2017-08-31 | 2017-12-29 | 攀钢集团研究院有限公司 | The method that 136RE+SS heat-treated rails move Flash Butt Welding |
| CN113305407A (en) * | 2021-06-15 | 2021-08-27 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Flash welding process of 75kg/m 1380MPa bainite steel rail |
| CN114054915A (en) * | 2021-11-29 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Short-circuit preheating flash welding method |
| CN115401299A (en) * | 2022-09-22 | 2022-11-29 | 东北大学 | Flash butt welding method for corrosion-resistant steel with yield strength of 600MPa under acid service environment |
-
2023
- 2023-01-31 CN CN202310079790.6A patent/CN115922042B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3435182A (en) * | 1965-08-19 | 1969-03-25 | Wuppermann Gmbh Theodor | Welding method |
| JPS4938855A (en) * | 1972-08-17 | 1974-04-11 | ||
| FR2795356A1 (en) * | 1999-06-23 | 2000-12-29 | Kvaerner Metals Clecim | SPARKING WELDING INSTALLATION |
| CN103894717A (en) * | 2012-12-31 | 2014-07-02 | 东风汽车车轮有限公司 | Preheating burnoff flash butt welding method for welding large-section steel vehicle wheels |
| CN107520529A (en) * | 2017-08-31 | 2017-12-29 | 攀钢集团研究院有限公司 | The method that 136RE+SS heat-treated rails move Flash Butt Welding |
| CN113305407A (en) * | 2021-06-15 | 2021-08-27 | 中国铁道科学研究院集团有限公司金属及化学研究所 | Flash welding process of 75kg/m 1380MPa bainite steel rail |
| CN114054915A (en) * | 2021-11-29 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Short-circuit preheating flash welding method |
| CN115401299A (en) * | 2022-09-22 | 2022-11-29 | 东北大学 | Flash butt welding method for corrosion-resistant steel with yield strength of 600MPa under acid service environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115922042A (en) | 2023-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105458623B (en) | A kind of R4 levels anchor chain welding production technology | |
| WO2017206463A1 (en) | Flash welding process for common link of grade r6 mooring chain | |
| CN105345413A (en) | Production process for welded chain cable | |
| CN115922042B (en) | Preheating flash butt welding method | |
| CN102935552B (en) | Flash welding forming method of constructional steel thin-wall ring member | |
| CN102974930B (en) | Flash welding forming method of cobalt-based high-temperature alloy thin-walled ring member | |
| CN1233548A (en) | Flash butt welding technology for aluminium alloy wheel rim of automobile and motor cycle | |
| CN102962570B (en) | Flash welding forming method of bearing steel thin-wall ring member | |
| CN103817416A (en) | One-step molding submerged arc welding method for steel sheet docking | |
| CN102909479A (en) | Welding method for square long girders | |
| CN102935551B (en) | Flash welding forming method of aluminum alloy thin-wall ring member | |
| CN102962567A (en) | Flash welding shaping method for nickel-based high-temperature alloy thin-wall ring | |
| CN102962569B (en) | Flash welding shaping method for Alpha-phase titanium alloy thin-walled ring | |
| CN104985306A (en) | Single power and double-thin wire submerged arc automatic welding process suitable for structural steel welding | |
| CN108356397A (en) | A kind of large-scale hydrogenation reactor inner wall anti-corrosion layer broadband pole overlaying method based on residual stress regulation and control | |
| CN205362979U (en) | Preparation radiator is with safe high -efficient oil pressure formula flash butt welding machine | |
| CA1161909A (en) | Method of resistance flash butt welding | |
| CN108296625B (en) | Friction stir welding-based method for connecting nodular cast irons with different thicknesses | |
| CN116140771A (en) | Intelligent preheating flash butt welding method considering change of welded junction temperature field | |
| JPH0331554B2 (en) | ||
| US4376882A (en) | Method of resistance flash butt welding | |
| CN102935553B (en) | Flash welding forming method of stainless steel thin-wall ring member | |
| KR20060074022A (en) | Hybrid welding method for fillet joint | |
| RU2613247C2 (en) | Method of mechanized arc welding with short circuit and in inert shielding gas | |
| CN100414159C (en) | Method for producing clip press type pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |