CN100484680C - Projection welding method of double pulse high capacity capacitance for energy storage - Google Patents
Projection welding method of double pulse high capacity capacitance for energy storage Download PDFInfo
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- CN100484680C CN100484680C CNB2005100294970A CN200510029497A CN100484680C CN 100484680 C CN100484680 C CN 100484680C CN B2005100294970 A CNB2005100294970 A CN B2005100294970A CN 200510029497 A CN200510029497 A CN 200510029497A CN 100484680 C CN100484680 C CN 100484680C
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Abstract
Disclosed is a method for double-pulse high capacity condenser energy storage projection welding in the field of welding technique, which contains: overlapping and locating the two low-alloy steel workpieces on the static lower-electrode, the upper-electrode down to compact the joint of workpieces, charging the condenser bank to Uc1, after first-time discharging to welding transformer by the closure of the commutator and the trigger of thyristors which are controlled by a program, breaking the commutator; cooling, and charging the condenser bank to Uc2, and generating the second-time discharging to welding transformer by the closure of the commutator and the trigger of thyristors; breaking the commutator after the energisation, releasing the upper-electrode after constant pressure-maintaining, and the welding process being completed. The invention realizes welding and tempering double-pulse welding in the energy storage resistance projection welding, especially applies to the point welding (projection welding) of thick low-alloy steel, and it has a key action to the joint strength, the joint tenacity and the surface quality. And, compared with other resistance welding power, it decreased the capacity requirement to the power of live wire entanglement.
Description
Technical field
What the present invention relates to is a kind of method of welding technology field, especially a kind of projection welding method of double pulse high capacity capacitance for energy storage.
Background technology
In automobile production,,, adopt high strength steel in the low-alloy now more and more to save the energy consumption in the automobilism in order to alleviate the total quality of automobile.Because often need to adopt resistance projection-welding or spot-welding technology in body of a motor car and the parts assembling, and compare with ordinary low-carbon steel, the electric resistance welding joint of low-alloy steel tends to occur the phenomenon that toughness descends, fragility increases.At present usually interchange pulse point of resistance (protruding) soldering method that adopts welds low-alloy steel, low, the poor toughness of joint surface quality not only, and require bigger for the bigger required grid power of workpiece of welding contact-making surface.
Through the prior art literature search is found, Yang Siqian etc. write articles " the dipulse spot-welding test research of TC3 titanium alloy " on " aero-manufacturing technology " 2002 (11), this article studies show that: under Thermal Cycle, the welding point of TC3 titanium alloy and heat affected area produce a large amount of titanium martensitic structures, joint plasticity is obviously descended, with the pulse second time its tack-weld is heat-treated, can improve the plasticity of joint, but what this article adopted is to adopt conventional industrial frequency AC mash welder, can only be used for the less spot welding situation of steel plate thickness and bonding area.Adopt the high capacity capacitance for energy storage projection welding method can produce concentrated heat, guarantee the intensity of slab, big bonding area joint, and require low to the electrical network input power, but because the difficult point in the capacitor charging/discharging switching yet there are no the research and the application of projection welding method of double pulse high capacity capacitance for energy storage at home.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of projection welding method of double pulse high capacity capacitance for energy storage that is used to connect big thickness low-alloy steel is provided.Make it at the limitation in the existing low-alloy steel electric resistance welding method of attachment technology, improve the intensity and the toughness of low-alloy steel jointing, and the profile pattern of low-alloy steel jointing, capacity requirement significantly reduced to grid power.
The present invention is achieved by the following technical solutions, two low-alloy steel workpiece that the present invention will be welded (wherein one is processed with flange in advance) overlap joint places on the static bottom electrode, top electrode descends, after the relative bottom electrode compacting of workpiece joints part, the capacitor group adopts voltage-tracing formula current-limiting charge mode to charge to U
C1, and, once disconnect commutator in (weld pulse) back to the welding transformer discharge by programme-control commutator closure, discharging thyristor triggering; After cooling, make the capacitor group charge to U simultaneously
C2, trigger to welding transformer by commutator closure and controllable silicon again and carry out the discharge second time (tempering pulse).Energising finishes to disconnect commutator, discharges top electrode after constant voltage is kept, and finishes welding process one time, forms projection welded joint.
U
C2Usually less than U
C1, its ratio is U
C2=0.5～0.7U
C1Weld pulse and tempering interpulse cool time is 0.5s～1s, and joint is big more, thickness of slab is thick more, and cool time is long more.
Described voltage-tracing formula current-limiting charge mode promptly by detecting the voltage of capacitor group in real time, by predefined rule feedback regulation charging silicon controlled angle of flow size, makes charging current keep constant substantially, to reduce the temporary impact to power supply grid.
The maximal input of capacitance energy storage welding equipment of the present invention is 72kVA, and the highest permission charging voltage is 440V, and the maximum discharge energy of each pulse is 28000 joules, and the electrode maximum pressure is 60kN, and maximum weld efficient is 4.5 seconds/time.
The present invention utilizes the advantage of high capacity capacitance for energy storage welding method concentration of energy, finish the projection welding process of low-alloy slab with transient high-current energy storage weld pulse, with discharge pulse for the second time established welding point is carried out tempering again, eliminate joint fragility, improve its toughness.With this kind method, can solve the projection welding problem of more and more promoting the use of in the auto parts and components production than high strength steel in the low-alloy of big thickness, and guarantee strength of joint and toughness, and improve the joint surface quality, also reduce the impact of welding current simultaneously to power supply grid.
The specific embodiment
Embodiment below is provided, technical solution of the present invention is done detailed statement.
Embodiment: the double pulse high capacity capacitance for energy storage projection welding of the revolution angle of chair in automobile device of making by the Q15 low-alloy steel product, its implementation process is as follows:
1, adopts the above-mentioned revolution angle of chair in automobile device of dipulse three phase capacitance energy-storage resistance welder welding.
2, gyrator is processed with one (thickness 4mm) of two flanges, flange upwards is placed on the plane bottom electrode of welding machine (each flange is internal diameter Φ 4.6, external diameter Φ 11, highly be the ball collar of 2mm), and another part (thickness 4mm) of gyrator located by anchor clamps puts thereon.
3, the plane top electrode descends, and with the relative bottom electrode compacting of gyrator blank area (electrode pressure is 47kN).
4, the capacitor group adopts voltage-tracing formula current-limiting charge mode to charge to U
C1=400V, and, once disconnect commutator in (the weld pulse peak value is 172kA, and pulse width is 25ms) back to the welding transformer discharge by programme-control commutator closure, discharging thyristor triggering.
5, behind cooling 0.5s, make the capacitor group charge to U simultaneously
C2=0.5U
C1Trigger to welding transformer by commutator closure and controllable silicon again and carry out the discharge second time (the tempering peak value of pulse is 100kA, and pulse width is 15ms).
6, energising finishes to disconnect commutator, discharges top electrode after constant voltage is kept, and finishes welding process one time, forms the gyrator projection welded joint.
The used electrical network actual power power of above example is 60kVA, be conventional about 1/5th when the welding that exchange, the quiet hot strength of welding point reaches 3600N, surpass the qualified requirement of product (3100N), fracture is tough break, eliminated the thick martensitic structure that pulse forms down, the no obvious impression in postwelding two surfaces.
Claims (6)
1, a kind of projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that: two low-alloy steel workpiece overlap joints that will be welded place on the static bottom electrode, top electrode descends, after the relative bottom electrode compacting of workpiece joints part, adopt voltage-tracing formula current-limiting charge mode that the capacitor group is charged to U
C1, and, once disconnect commutator in the back to the welding transformer discharge by programme-control commutator closure, discharging thyristor triggering; After cooling, make the capacitor group charge to U simultaneously
C2, trigger to welding transformer by commutator closure and controllable silicon again and carry out the discharge second time; Energising finishes to disconnect commutator, discharges top electrode after constant voltage is kept, and finishes welding process one time.
2, according to right 1 described projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that, be processed with flange in advance on one of them low-alloy steel workpiece welding contact-making surface.
3, according to right 1 described projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that U
C2=0.5～0.7U
C1
According to right 1 described projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that 4, weld pulse and tempering interpulse cool time is 0.5s～1s, joint is big more, thickness of slab is thick more, and cool time is long more.
5, according to right 1 described projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that, described employing voltage-tracing formula current-limiting charge mode is charged the capacitor group, promptly by detecting the voltage of capacitor group in real time, by predefined rule feedback regulation charging silicon controlled angle of flow size, make charging current keep constant substantially, to reduce temporary impact to power supply grid.
6, according to right 1 described projection welding method of double pulse high capacity capacitance for energy storage, it is characterized in that, the capacitance energy storage welding equipment maximal input that is adopted is 72kVA, the highest permission charging voltage is 440V, the maximum discharge energy of each pulse is 28000 joules, the electrode maximum pressure is 60kN, and maximum weld efficient is 4.5 seconds/time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100294970A CN100484680C (en) | 2005-09-08 | 2005-09-08 | Projection welding method of double pulse high capacity capacitance for energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100294970A CN100484680C (en) | 2005-09-08 | 2005-09-08 | Projection welding method of double pulse high capacity capacitance for energy storage |
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| CN1736649A CN1736649A (en) | 2006-02-22 |
| CN100484680C true CN100484680C (en) | 2009-05-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061374A (en) * | 2010-11-19 | 2011-05-18 | 贵阳万江航空机电有限公司 | Method for eliminating projection welding brittleness of high carbon steel |
| CN102091857B (en) * | 2011-01-11 | 2013-04-03 | 山东浩器生物装备技术有限公司 | Process for welding vacuum freeze dryer plate layer |
| CN102500901B (en) * | 2011-11-16 | 2014-04-16 | 上海交通大学 | Composite pulsation spot welding process and system |
| CN102581459B (en) * | 2012-03-07 | 2014-06-25 | 上海交通大学 | Electric resistance welding method for variable-thickness ultra-high strength hot formed steel plate and low-carbon steel plate |
| CN103008866A (en) * | 2012-12-27 | 2013-04-03 | 中航(苏州)雷达与电子技术有限公司 | Combined welding method for bimetallic strip |
| CN108161201B (en) * | 2017-12-12 | 2021-02-26 | 广州亨龙智能装备股份有限公司 | Application of capacitive energy storage welding process in welding of pin shaft and hot-formed martensitic steel |
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2005
- 2005-09-08 CN CNB2005100294970A patent/CN100484680C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 一种新型储能点焊机的研制. 姚河清，陆亚珍.电焊机，第32卷第7期. 2002 |
| 一种新型储能点焊机的研制. 姚河清，陆亚珍.电焊机，第32卷第7期. 2002 * |
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| CN1736649A (en) | 2006-02-22 |
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Granted publication date: 20090506 Termination date: 20110908 |