CN109676227A - 900MPa high intensity loop chain pulsed flashing butt welding technique - Google Patents
900MPa high intensity loop chain pulsed flashing butt welding technique Download PDFInfo
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- CN109676227A CN109676227A CN201910007829.7A CN201910007829A CN109676227A CN 109676227 A CN109676227 A CN 109676227A CN 201910007829 A CN201910007829 A CN 201910007829A CN 109676227 A CN109676227 A CN 109676227A
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- loop chain
- welding
- butt welding
- technique
- 900mpa
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
- B23K11/046—Apparatus therefor
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Abstract
The present invention relates to a kind of 900MPa high intensity loop chain pulsed flashing butt welding techniques, comprising: 900MPa grades of loop chain bars are successively carried out volume ring, surface treatment, the pre-heat treatment after annealing；Loop chain bar after above-mentioned the pre-heat treatment is subjected to pulsed flashing butt welding, upset, pressure maintaining；Loop chain bar after welding be pre-stretched, quenched-tempering heat treatment to get；Pulse in the pulsed flashing butt welding is the superimposed pulse electric current on average welding current, while applying fluctuation pressure.Using above-mentioned 900MPa grade high-strength loop chain Flash Butt Welding technique, surfacing, welding crackle and field trash, the flush weld tool joint for meeting requirement can be obtained in low spatter, efficient situation.
Description
Technical field
The invention belongs to welding technology fields, and in particular to a kind of method of 900MPa high intensity loop chain flash butt welding.
Background technique
High-strength steel ring chain has excellent transmission performance because of its large carrying capacity, reliable operation, convenient for disassembly and assembly, extensively
For mining machinery, marine ship and Military Warship etc..But no matter the working environment of underground coal mine or ocean, military service item
Part is poor, needs higher wearability, corrosion resistance, high intensity and fatigue life.High-strength steel ring chain is often with welding method
Flash butt welding, flash butt welding are the digital processes of effect of multiple parameters, and the welding current and pressure and other parameters in each stage all can
Welding quality has an impact.The selection of high-performance welding parameters and the control of welding procedure of 900MPa high intensity loop chain have
Higher requirement.
The tendency of hardenability of 900MPa high intensity loop chain is big, and there may be the softenings of cold crack and heat affected area in welding.Cause
The key of this high-intensitive loop chain welding is to control the generation of cold crack and guarantees connector while meeting high intensity and requiring
High impact toughness.Multi-pass crosses control welding parameter and weld preheating and post weld heat treatment to realize performance in production process
Adjustment.
Chinese invention patent (ZL200910181286.7) proposes a kind of high-strength steel ring chain flash butt welding technique, it can be achieved that one
The manufacture of the 800MPa grade high-strength loop chain of set pattern lattice, meets mining loop chain production requirement.But for the loop chain of higher intensity
There are still certain difficulty for welding.
Chinese patent discloses a kind of manufacturing method of high-intensitive ladder chain of CN201510131125.2, and technique is as follows: cutting
Cut blanking → heating in medium frequency → chaining → flash butt welding → deburring → heat treatment → stretching → inspection → japanning storage.
Importantly, currently, the 900MPa grade high-strength ring that China uses in large ship, naval vessels and ocean engineering
90% or more chain relies on foreign import, and there is also certain gaps for welding technique of the China in field level similar with the world.Cause
This, if be able to achieve using efficient pulsed flashing butt welding technology realize higher intensity loop chain manufacture, to improve welding condition,
It is significant to improve high-strength loop chain performance.
Summary of the invention
For the high performance demand of 900MPa high intensity loop chain and the deficiencies in the prior art, the present invention is directed to propose a kind of high
The 900MPa high intensity loop chain pulsed flashing butt welding technique of effect.The present invention can give full play to the advantage of pulsed flashing butt welding, high
The good high-intensitive loop chain of the acquisition joint performance of efficiency.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A kind of 900MPa high intensity loop chain pulsed flashing butt welding technique, comprising:
900MPa grades of loop chain bars are successively annealed, compile ring, surface treatment, the pre-heat treatment；
Loop chain bar after above-mentioned the pre-heat treatment is subjected to pulsed flashing butt welding, upset, pressure maintaining；
Loop chain bar after welding be pre-stretched, quenched-tempering heat treatment to get；
Pulse in the pulsed flashing butt welding is the superimposed pulse electric current on average welding current, while applying pulsating pressure
Power.
The application research shows that: conventional pulsed flashing butt welding technology (pulse current is only provided) for high-intensitive loop chain,
It easily induces loop chain joint and generates field trash, hardened structure, or even cause crackle.For this purpose, the application is in further investigation 900MPa
On the basis of high-intensitive loop chain causes of crack, grope to find by a large number of experiments: during pulsed flashing butt welding, superposition
One impulse oscillation (pulsation), not only can be effectively reduced the generation of hardened structure and crackle, additionally it is possible to guarantee higher heat
Amount input, effectively controls weld seam austenite grain size, removes field trash, significantly increases loop chain welding point obdurability.
On the other hand, in order to guarantee that pulsation and pulse current are capable of forming effective cooperation, reach expected welding effect.Cause
This, in some embodiments, the welding parameter of preferred pulsed flashing butt welding are as follows: 19.5~29.5mm of initial length, flash of light length
Spend 16.0~23.5mm, 12.0~14.5mm of final lengths, 0.5~0.6mm/s of sliding speed, 0.3~0.6mm of amplitude, frequency
15~20HZ, 760~1200A of carrying current, 180~210V of weldingvoltage.Flash of light can be effectively improved using above-mentioned parameter
The tensile strength of butt joint.
In some embodiments, the volume ring uses cold volume.
The application research discovery: it is different from general Medium And Low Strength Steels, since the intensity of 900MPa high intensity loop chain is high, toughness
It is poor with plasticity.Therefore, it is welded if directlying adopt pulsed flashing butt welding, will lead to loop chain joint and harden and crack.For this purpose,
The application first carries out 550~650 DEG C × 2.5~4h annealing to 900MPa high intensity loop chain before welding, to improve ring
Chain structural state.The result shows that: mid-frequency induction heating is carried out to loop chain bar at 150~250 DEG C before welding, ring can be effectively improved
Chain weld seam associativity and tensile strength reduce surface defect.Therefore, in some embodiments, the pre-heat treatment be 150~
250 DEG C carry out mid-frequency induction heating to loop chain bar.
In some embodiments, the stretching total amount of the pre-stretching is set as 5~10mm.
In some embodiments, the temperature of the quenching is 910~930 DEG C, and hardening media is water.
In some embodiments, the temperature of the tempering is 310~350 DEG C.
In some embodiments, 2~4s of pressure maintaining after the completion of the flash of light upset stage.
Present invention also provides the 900MPa high strength steel loop chains of any above-mentioned technique welding.
Present invention also provides above-mentioned 900MPa high strength steel loop chains to adopt in manufacture drag conveyor, wound coal machine, roller
Coal machine, the application in grain, the Super-Bucket Elevator of cement industry and mining machinery, marine ship and Military Warship.
The beneficial effects of the present invention are:
(1) present invention uses above-mentioned 900MPa grade high-strength loop chain Flash Butt Welding technique, can be in low spatter, high efficiency
In the case where obtain surfacing, without field trash and weld crack, the flush weld tool joint for meeting requirement.
(2) technical key point of the present invention is embodied in: the superimposed pulse electric current on welding current, improves heating speed, heating
It can guarantee there is higher heat input while the steepening of temperature field, incline to effectively inhibit high-strength loop chain and harden with cold cracking
To；Apply fluctuation pressure simultaneously, is superimposed a pumping processes during welding collet dynamic and feeding, is voluntarily drawn during flash of light
Disconnected liquid lintel, improves the thermal efficiency.It is aided with matched weld preheating measure and post weld heat treatment measure simultaneously, is further promoted
While connector area toughness Crack prevention, the softening of welding point is controlled, guarantees that the integral strength of loop chain meets use and wants
It asks.
(3) compared with conventional High Intensity loop chain flash butt welding, addition pulse reduces the liquid mistake during flash butt welding
Beam explosion, reduces spatter, improves working environment, and improve welding production efficiency, has saved the energy.The present invention
The high-intensitive loop chain that performance is high-quality, the tensile strength of fusion well, after heat treatment reaches 900MPa or more, Ke Yiman can be obtained
The demand of sufficient mining machinery, marine ship and Military Warship.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 loop chain opening size schematic diagram；
Pictorial diagram after the welding of Fig. 2 loop chain；
Fig. 3 loop chain flash butt welding section-does not have microdefect；
Fig. 4 loop chain complete diagram.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used in this application have logical with the application person of an ordinary skill in the technical field
The identical meanings understood.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form.Additionally, it should be understood that when using term "comprising" and/or " packet in the present specification
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, it is difficult to meet 900MPa grade high-strength ring for current loop chain flash butt welding technique
Manufacture, the production requirement of chain.Present applicant proposes a kind of 900MPa high intensity loop chain pulsed flashing butt welding techniques, and steps are as follows:
(1) blanking, annealing are carried out to 900MPa grades of loop chain bars and compiles ring, remove greasy dirt and the oxidation on loop chain surface
Object makes any surface finish free from admixture, promotes electric conductivity and surface quality；
(2) loop chain after surface treatment is subjected to the pre-heat treatment, the loop chain handled well is transported to by auxiliary conveying appliance
Flash pulse welding machine station to be welded, grips automatically；
(3) pulsed flashing butt welding is carried out, the welding stage is divided into pulse flash-pulsation upset-pressure maintaining several stages, main to weld
Connect parameter are as follows: 19.5~29.5mm of initial length, glisten 16.0~23.5mm of length, and 12.0~14.5mm of final lengths is slided
0.5~0.6mm/s of speed, 0.3~0.6mm of amplitude, 15~20HZ of frequency, 760~1200A of carrying current, weldingvoltage 180~
210V, upsetting force 15MPa~28MPa of pulsing.2~4s of pressure maintaining after the completion of the flash of light pulsation upset stage, pulsed flashing butt welding are complete
At rear progress mechanical epilation thorn；
(4) it after whole chain completes flash butt welding process, is pre-stretched, then loop chain is carried out by intermediate frequency furnace
Quenching-tempering heat treatment.
In the step (1), blanking is realized on punching machine, guarantees every bar by pre-set limiting tool
Blank size, dimensional discrepancy be no more than 1mm.
In the step (1), annealing parameter is 550~650 DEG C × 2.5~4h.
In the step (1), compiling ring technique is mainly cold volume.It is realized on ring machine compiling automatically, controls the sudden strain of a muscle of different size
The gap size of light butt joint.
In the step (2), preheating is realized by mid-frequency induction heating, and preheating temperature is controlled at 150~250 DEG C.
In the step (3), pulsed flashing butt welding is divided into pulse flash stage and upset stage.It is rationed the power supply by control electrode
The heat input that stream, weldingvoltage control are welded is docked to meet the round-link chain flash of light of different size diameters.For larger diameter ruler
Very little loop chain, needs bigger welding conditions, and initial length and flash of light length needs accordingly increase.
In the step (3), pulse refers to superimposed pulse electric current (carrying current) on average welding current, while applying arteries and veins
Dynamic pressure is realized and is superimposed a pumping processes during welding machine moves the feeding of collet.
It in the step (4), is pre-stretched at and is carried out on Automatic-drawing testing machine, stretch total amount and be set as 5~10mm.
In the step (4), hardening heat is higher compared to general heat treatment temperature, passes through mid-frequency induction heating, quenching
910~930 DEG C of temperature, tempering temperature is controlled at 310~350 DEG C, and wherein hardening media is water, and passes through circulation water management water
Temperature.
With reference to the accompanying drawing and specific embodiment the present invention is described further
Embodiment 1:
It is SAE8620H high-strength steel for loop chain steel, specification isHigh-intensitive loop chain, carry out pulse sudden strain of a muscle
Light butt welding is welded using pulsed flashing butt welding machine.
Steps are as follows for specific welding procedure:
SAE8620H bar is processed into length on Jh23-100 model punching machineBar, by 600
DEG C × 4h annealing after be put into BFBL-40-2A and compile ring machine, be then pressed into annulus, control the opening size of annulus interface,
Inner ring is 0.5~1mm, and outer ring is 2~4mm, and dimensional structure figure is as shown in Figure 1.
The loop chain item that ring completion will be compiled is put into Medium Frequency Induction Heating Furnace and is heated to 180~190 DEG C, and the loop chain after preheating passes through
Auxiliary conveying appliance is transported to pulsed flashing butt welding machine.Be sent to flash butt welding station to be welded by mechanical device, positioning clamp into
Enter the pulsed flashing butt welding stage.Welding parameter are as follows: initial length 20.0mm, glisten length 17.0mm, final lengths 13.3mm, sliding
Scanning frequency degree 0.5mm/s, amplitude 0.5mm, frequency 15HZ, carrying current 750A, weldingvoltage 180V.It glistens the upset stage and (pulses
Upsetting force is pressure maintaining 2.5s after the completion of 18~20MPa), goes thorn device removal compressing process to generate by swing after pressure maintaining
Burr.
It is pre-stretched after whole chain completes flash butt welding process, stretching total amount is 6~7mm, then passes through intermediate frequency
Induction furnace is heated to 910~920 DEG C of progress water quenchings, is heated to 320~330 DEG C of progress temperings later.
It is well combined by weld-ring chain weld seam, forming is beautiful, no face crack, without microdefect (as shown in Figure 2,3), loop chain
Tensile strength reaches 934MPa.
Embodiment 2:
It is to specification900MPa grade high-strength loop chain pulsed flashing butt welding.Loop chain steel are
23MnNiMoCr54 is welded using pulse flash welding machine.
Specific flash butt welding processing step is as follows:
23MnNiMoCr54 bar is processed into the bar of 490 ± 1.0mm on Jh23-100 model punching machine, by 620
DEG C × 4h annealing after be put into BFBL-40-2A and compile ring machine automatically, then compile ring automatically.The opening size after ring is compiled in control, interior
Circle is 0.8~1.2mm, and outer ring is 2.5~4.5mm.
Loop chain item after ball blast is put into Medium Frequency Induction Heating Furnace and is heated to 190~200 DEG C, the loop chain after preheating passes through auxiliary
Conveying device is helped to be transported to pulse flash welding machine.It is sent to flash butt welding station to be welded by mechanical device, positioning, which clamps, enters arteries and veins
Rush the flash butt welding stage.The technological parameter of flash butt welding are as follows: initial length 29.5mm, glisten length 23.5mm, final lengths
12.0mm, sliding speed 0.5mm/s, amplitude 0.6mm, frequency 20HZ, carrying current 1150A, weldingvoltage 210V, upset of pulsing
Pressure is 20~24MPa.Pressure maintaining 3s after the completion of the flash of light upset stage goes thorn device to remove upset mistake after pressure maintaining by swing
The burr that journey generates.
It is pre-stretched after whole loop chain item completes flash butt welding process, stretchings total amount is 8~10mm, is then passed through
Frequency induction furnace is heated to 910~920 DEG C of progress water quenchings, is heated to 310~320 DEG C of progress temperings later.It is welded by weld-ring chain
Seam is well combined, and weld appearance forming is beautiful, and free of surface defects, loop chain tensile strength reaches 968MPa, meets requirement.
Finally it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify to technical solution documented by previous embodiment, or part is equivalently replaced.It is all in the present invention
Spirit and principle within, any modification, equivalent replacement, improvement and so on, should be included in protection scope of the present invention it
It is interior.Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to the scope of the present invention
Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art do not need
Make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of 900MPa high intensity loop chain pulsed flashing butt welding technique characterized by comprising
Volume ring, surface treatment, the pre-heat treatment are successively carried out after 900MPa grades of loop chain bars are made annealing treatment；
Loop chain bar after above-mentioned the pre-heat treatment is subjected to pulsed flashing butt welding, upset, pressure maintaining；
Loop chain bar after welding be pre-stretched, quenched-tempering heat treatment to get；
Pulse in the pulsed flashing butt welding is the superimposed pulse electric current on average welding current, while applying fluctuation pressure.
2. technique as described in claim 1, which is characterized in that the welding parameter of the pulsed flashing butt welding are as follows: initial length
19.5~29.5mm, glisten 16.0~23.5mm of length, 12.0~14.5mm of final lengths, 0.5~0.6mm/s of sliding speed,
0.3~0.6mm of amplitude, 15~20HZ of frequency, 760~1200A of carrying current, 180~210V of weldingvoltage.
3. technique as described in claim 1, which is characterized in that 900MPa grades of bars annealing parameters are 550~650 DEG C ×
2.5~4h.
4. technique as described in claim 1, which is characterized in that the volume ring uses cold volume；
Or the pre-heat treatment is to carry out mid-frequency induction heating to loop chain bar at 150~250 DEG C.
5. technique as described in claim 1, which is characterized in that the stretching total amount of the pre-stretching is set as 5~10mm.
6. technique as described in claim 1, which is characterized in that the temperature of the quenching is 910~930 DEG C, and hardening media is
Water.
7. technique as described in claim 1, which is characterized in that the temperature of the tempering is 310~350 DEG C.
8. technique as described in claim 1, which is characterized in that 2~4s of pressure maintaining after the completion of the flash of light upset stage.
9. the 900MPa high strength steel loop chain of the described in any item technique welding of claim 1-8.
10. 900MPa high strength steel loop chain as claimed in claim 9 is in manufacture drag conveyor, wound coal machine, flitting, grain
Application in food, the Super-Bucket Elevator of cement industry and mining machinery, marine ship and Military Warship.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910007829.7A CN109676227B (en) | 2019-01-04 | 2019-01-04 | 900MPa high-strength loop chain pulse flash butt welding process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910007829.7A CN109676227B (en) | 2019-01-04 | 2019-01-04 | 900MPa high-strength loop chain pulse flash butt welding process |
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| CN109676227B CN109676227B (en) | 2020-12-29 |
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Cited By (4)
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| CN111992862A (en) * | 2020-07-23 | 2020-11-27 | 江苏省沙钢钢铁研究院有限公司 | Flash welding method for HRB600 high-strength hot-rolled steel bar |
| CN113031533A (en) * | 2021-03-05 | 2021-06-25 | 西南交通大学 | Control method and device for alternating-current flash welding of steel rail and welding equipment |
| CN113165101A (en) * | 2019-09-06 | 2021-07-23 | Posco公司 | Flash butt welding member having excellent formability of rim weld portion and flash butt welding method |
| CN113414547A (en) * | 2021-06-10 | 2021-09-21 | 阳泉煤业华茂制链有限公司 | High-strength welding compensation process for mine endless chain |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113165101A (en) * | 2019-09-06 | 2021-07-23 | Posco公司 | Flash butt welding member having excellent formability of rim weld portion and flash butt welding method |
| CN113165101B (en) * | 2019-09-06 | 2022-10-04 | Posco公司 | Flash butt welding member having excellent formability of rim weld portion and flash butt welding method |
| CN111992862A (en) * | 2020-07-23 | 2020-11-27 | 江苏省沙钢钢铁研究院有限公司 | Flash welding method for HRB600 high-strength hot-rolled steel bar |
| CN111992862B (en) * | 2020-07-23 | 2022-02-18 | 江苏省沙钢钢铁研究院有限公司 | Flash welding method for HRB600 high-strength hot-rolled steel bar |
| CN113031533A (en) * | 2021-03-05 | 2021-06-25 | 西南交通大学 | Control method and device for alternating-current flash welding of steel rail and welding equipment |
| CN113414547A (en) * | 2021-06-10 | 2021-09-21 | 阳泉煤业华茂制链有限公司 | High-strength welding compensation process for mine endless chain |
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| CN109676227B (en) | 2020-12-29 |
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