CN102672332A - Method for prolonging service life of resistance spot welding electrode of galvanized thin steel plate - Google Patents
Method for prolonging service life of resistance spot welding electrode of galvanized thin steel plate Download PDFInfo
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- CN102672332A CN102672332A CN2012101495233A CN201210149523A CN102672332A CN 102672332 A CN102672332 A CN 102672332A CN 2012101495233 A CN2012101495233 A CN 2012101495233A CN 201210149523 A CN201210149523 A CN 201210149523A CN 102672332 A CN102672332 A CN 102672332A
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Abstract
The invention relates to a method for prolonging the service life of a resistance spot welding electrode of a galvanized thin steel plate; when the galvanized thin steel plate is connected by resistance spot welding, an upper layer Cu-Ni alloy process gasket is inserted between a top electrode and an upper layer galvanized steel plate to be welded, and a lower layer Cu-Ni alloy process gasket is inserted between a lower electrode and a lower layer galvanized steel plate to be welded; each Cu-Ni alloy process gasket comprises the following components by mass percent: 40-45% of Ni, 1-1.5% of Mn and the balance of Cu, and respectively has the resistivity within the range of 0.45-0.51 and the thickness within the range of 0.05-0.2mm. The method can effectively reduce the temperature of the end surface of the electrode, and reduces the abrasion of the electrode, thus prolonging the service life of the electrode; the Cu-Ni alloy process gaskets hardly have alloying reaction with electrode material, so that the abrasion is further reduced; the formation and growth of spot welding nugget can be promoted by the self resistance heat of the Cu-Ni alloy process gaskets, so that the quality of a spot-welded joint can be improved, and the current needed by welding is reduced, and the energy consumption is lowered.
Description
Technical field
The present invention relates to welding technology field, specifically is a kind of galvanized sheet metal lifetime of resistance spot welding electrode end face temperature that is used to reduce, and improves the method for electrode life.
Background technology
In order to satisfy the needs of automobile lightweight, security and fuel economy, a large amount of zinc-plated high-strength steel sheets are applied in the vehicle body manufacturing.Resistance spot welding is a kind of important thin plate interconnection technique, is the main welding assembly method that vehicle body is made.Compared to the non-coating steel plate, spot welding zinc coated steel needs stronger welding conditions and zinc coat to be prone to and electrode generation alloying, makes wear to electrodes serious.Along with the attenuate of steel plate thickness (< 0.6 millimeter), the heat of welding region more is prone to conduct to electrode cap, causes the too high and aggravation electrode end surface alloying reaction of electrode end surface temperature, accelerates wear to electrodes.In the galvanized sheet metal pinpoint welding procedure, need frequent finishing or change electrode, cause the serious decline of productivity ratio and the lifting of production cost.
Through changing the method for electrode material characteristic; As use the material that can bear higher temperature to replace existing electrode material or, be usually used in prolonging electrode life through the effect that heat treatment, surperficial infiltration layer are handled, the molten application layer of electrode end surface etc. reaches the sclerosis electrode.But said method only in spot welding than 0.75 millimeter of steel plate (>) in confirm that effectively in galvanized sheet metal spot welding, the effectiveness of this method is also indeterminate.In addition, the said method cost is too high can't be widely used in production practices.Can effectively reduce the electrode end surface temperature through optimizing the electrode cooling system, but result of study shows that to use this method cooling effect limited, still is difficult to active electrode end face temperature, prolong galvanized sheet metal spot-wedling electrode service life.
Through the method for insertion craftwork pad sheet between electrode and materials to be welded, or can effectively reduce electrode end surface temperature in the galvanized sheet metal resistance spot welding process, thereby improve electrode life.The effect of technology pad is mainly reflected in two aspects.On the one hand, in the energising heating process, the resistance of technology pad itself is given birth to formation and the growth that heat energy enough promotes nugget, and required welding current also can suitably reduce; On the other hand, the existence of technology pad has increased the distance between electrode end surface and welding region, maybe can reduce the electrode end surface temperature, improves electrode life.For galvanized steel plain sheet, the technology pad has intercepted contacting of electrode end surface and zinc layer, prevents that it from the metal alloy reaction taking place, and can further prolong electrode life.The selection and the materials to be welded characteristic of attributes such as craftwork pad sheet material, thickness are closely related, and the quality that technology pad attribute is selected will directly influence the implementation result of this method.Yet, do not find the relevant report that is applicable to the craftwork pad sheet material of galvanized sheet metal at present.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of galvanized sheet metal lifetime of resistance spot welding electrode end face temperature that is used to reduce is provided, improve the method for electrode life.Through inserting the corronil thin slice at electrode and between by the weldering galvanized sheet metal, not only promoted nugget to form and growth, reduce required welding current, more can effectively reduce the electrode end surface temperature, reduce wear to electrodes and prolong electrode life.
Technical solution of the present invention is following:
A kind ofly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life; Its characteristics are; When the galvanized sheet metal resistance spot welding connects; Between top electrode and upper strata galvanized steel plain sheet to be welded, insert upper copper nickel alloy technology pad, between bottom electrode and lower floor galvanized steel plain sheet to be welded, insert lower floor's corronil technology pad.
The concrete steps of the inventive method are following:
Upper copper nickel alloy technology pad, upper strata galvanized steel plain sheet to be welded, lower floor's galvanized steel plain sheet to be welded, lower floor's corronil technology pad are from top to bottom stacked successively, and be fixedly clamped;
Make top electrode and bottom electrode closed, defeat tight and keep certain hour with conventional electrodes;
After precompressed is accomplished, make the welding of a top electrode and a solder joint of bottom electrode energising completion with the welding parameter of routine;
Accomplish the welding back and cut off electric current, top electrode and bottom electrode continue to remain closed with conventional electrodes defeats tightly and keeps certain hour;
Open top electrode, bottom electrode at last, weld parts is cooled off naturally, takes out upper copper nickel alloy technology pad and lower floor's corronil technology pad and gets final product.
Described upper and lower electrode is processed by copper and copper alloy, like the Cu-Cr-Zr electrode, and Cu-W electrode or Cu-Al
2O
3Electrodes etc., electrode need not specially treated.The electrode tip shape is not limit, radius tip electrode, and dome electrode, tapered electrode or plane electrode all can.
Attributes such as the material of described upper and lower layer galvanized steel plain sheet to be welded, thickness are identical, and its parent metal is mild steel, high-strength steel, advanced high-strength steel or super-high strength steel etc.The thickness of steel plate is the 0.2-0.6 millimeter, and thickness of coating is the 0-30 micron, and promptly the inventive method also can be used for not having the naked steel plate of coating.
Described corronil technology pad is the thin slice of being processed by the corronil material, and component and mass percent thereof are: nickel content 40%-45%, and manganese content 1%-1.5%, surplus is a copper.
The resistivity of described corronil technology pad is about 0.45-0.51
.
The thickness of described corronil technology pad is the 0.05-0.20 millimeter.
Compared with prior art the present invention has the following advantages: the present invention can effectively reduce the electrode end surface temperature through between spot-wedling electrode and galvanized sheet metal to be welded, adding the corronil thin slice, reduces wear to electrodes, prolongs electrode life.The postwelding galvanized steel plain sheet does not have the destruction of zinc coat, does not have general copper, helps improving the corrosion resistance and the electrode life of weldment.Employed corronil pad is difficult for alloying reaction takes place with electrode material, then can further reduce wearing and tearing, improves electrode life.In addition, the resistance of technology pad itself is given birth to formation and the growth that heat energy enough promotes nugget, improves the tack-weld quality, also can reduce the required electric current of welding simultaneously and cut down the consumption of energy.
Description of drawings
Fig. 1 embodiment of the invention process sketch map
Fig. 2 embodiment of the invention electrode end surface diameter is with the Changing Pattern figure of wear to electrodes
Fig. 3 embodiment of the invention nugget size is with the Changing Pattern figure of wear to electrodes.
The specific embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1; A kind ofly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life; Be when the galvanized sheet metal resistance spot welding connects; Between top electrode 1 and upper strata galvanized steel plain sheet 3 to be welded, insert upper copper nickel alloy technology pad 2, between bottom electrode 6 and lower floor to be welded zinc-plated 4, insert lower floor's corronil technology pad 5.
The inventive method specifically comprises the steps:
Between top electrode 1 and bottom electrode 6, upper copper nickel alloy technology pad 2, upper strata galvanized steel plain sheet to be welded 3, lower floor galvanized steel plain sheet to be welded 4, lower floor's corronil technology pad 5 are from top to bottom stacked successively, and be fixedly clamped;
Make top electrode 1 and bottom electrode 6 closures, defeat tight and keep certain hour with predetermined electrode;
After precompressed is accomplished, make top electrode and bottom electrode energising accomplish the welding of a solder joint with predetermined welding parameter;
After reaching pre-set weld interval, cut off electric current, upper and lower electrode continues to remain closed with set electrode force workpiece pressing and prevents to produce spatter;
Open top electrode, bottom electrode at last, weld parts is cooled off naturally, takes out upper and lower layer corronil technology pad and gets final product.
Top electrode 1 is Class 1 chromium zirconium copper electrode with bottom electrode 6, and the electrode end surface diameter is 5 mm.
Upper strata galvanized steel plain sheet 3 to be welded all is double side zinc coating low carbon steel plate (mass percent C:0.04C, Si:0.01, Mn:0.23 with lower floor's galvanized steel plain sheet 4 to be welded; P:0.01P, S:0.01, surplus is Fe); Thick 0.4 mm of steel plate, two-sided thickness of coating is 46g/m
2
Described upper copper nickel alloy technology pad 2 is 44% nickel by component and mass percent all with lower floor's corronil technology pad 5; 1% manganese; The corronil material of 55% bronze medal is processed; Its resistivity be 0.49
, thickness is 0.12 millimeter.
Technological parameter: predetermined electrode is defeated power 1.8 kN, and squeeze time 200 ms, welding current are 5.7 kA, weld intervals 160 ms, postwelding dwell times 40 ms.With 30 solder joints/minute the speed of welding continuous welding, test electrode end face diameter, nugget size be with the Changing Pattern of wear to electrodes, result such as Fig. 2 are shown in Figure 3.
From Fig. 2, the result of Fig. 3 can obviously find out, is 44% nickel through using thick component of 0.12 mm and mass percent in the instance of the present invention, 1% manganese, and the corronil material technology pad of 55% bronze medal, electrode end surface diameter accretion speed obviously reduces.After accomplishing 600 continuous solder joints, traditional resistor spot-wedling electrode end face diameter increases to 6 mm, and after using the technology pad, the electrode end surface diameter is merely 5.18 mm.As shown in Figure 3, the traditional resistor spot-welding technology is after accomplishing 300 continuous solder joints, and nugget size drops to and is lower than minimum criterion of acceptability 3.0 mm.After using the technology pad in the present embodiment, after 2000 of the continuous weldings, the nugget quality is still qualified.
Claims (9)
1. one kind is used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, it is characterized in that
When the galvanized sheet metal resistance spot welding connects, between top electrode and upper strata galvanized steel plain sheet to be welded, insert upper copper nickel alloy technology pad, between bottom electrode and lower floor galvanized steel plain sheet to be welded, insert lower floor's corronil technology pad.
2. according to claim 1ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, it is characterized in that the concrete steps of this method are following:
Upper copper nickel alloy technology pad, upper strata galvanized steel plain sheet to be welded, lower floor's galvanized steel plain sheet to be welded, lower floor's corronil technology pad are from top to bottom stacked successively, and be fixedly clamped;
Make top electrode and bottom electrode closed, defeat tight and keep certain hour with conventional electrodes;
After precompressed is accomplished, make the welding of a top electrode and a solder joint of bottom electrode energising completion with the welding parameter of routine;
Accomplish the welding back and cut off electric current, top electrode and bottom electrode continue to remain closed with conventional electrodes defeats tightly and keeps certain hour;
Open top electrode, bottom electrode at last, weld parts is cooled off naturally, takes out upper copper nickel alloy technology pad and lower floor's corronil technology pad and gets final product.
3. according to claim 1 and 2ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life; The component and the mass percent thereof that it is characterized in that described upper copper nickel alloy technology pad and lower floor's corronil technology pad are: nickel content 40%-45%; Manganese content 1%-1.5%, surplus is a copper.
4. according to claim 3ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life; It is characterized in that the resistivity of said upper copper nickel alloy technology pad and lower floor's corronil technology pad is respectively 0.45-0.51
.
5. according to claim 3ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, it is characterized in that the thickness of described upper copper nickel alloy technology pad and lower floor's corronil technology pad is respectively the 0.05-0.2 millimeter.
6. according to claim 1 and 2ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life; It is characterized in that: the thickness of said upper strata galvanized steel plain sheet to be welded and lower floor's galvanized steel plain sheet to be welded is respectively 0.2-0.6 millimeter, and thickness of coating is the 0-30 micron.
7. according to claim 6ly be used to prolong the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, the parent metal that it is characterized in that said upper strata galvanized steel plain sheet to be welded and lower floor's galvanized steel plain sheet to be welded is mild steel, high-strength steel, advanced high-strength steel or super-high strength steel.
8. according to claim 1 and 2 in prolonging the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, it is characterized in that: described top electrode and bottom electrode are processed by copper and Cu alloy material respectively.
9. according to claim 8 in prolonging the galvanized sheet metal lifetime of resistance spot welding electrode method in service life, it is characterized in that: the end shape of described top electrode and bottom electrode is spherical, cheese, taper or plane.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111741A (en) * | 2012-12-21 | 2013-05-22 | 上海交通大学 | Controllable electrode force method for lowering welding spatter of resistance spot welding of sandwich plate |
| CN109352155A (en) * | 2018-11-16 | 2019-02-19 | 上海交通大学 | For improving the welding procedure of zinc-plated super-high strength steel resistance spot welding welding quality |
| CN110142492A (en) * | 2019-06-06 | 2019-08-20 | 武汉钢铁有限公司 | Without splashing Progress in Automobile Galvanized Steel Sheets resistance spot welding method |
| CN107914056B (en) * | 2017-11-20 | 2020-08-11 | 苏州安洁科技股份有限公司 | Welding process for improving flatness of welding head |
| CN113275724A (en) * | 2021-05-28 | 2021-08-20 | 天津津荣天宇精密机械股份有限公司 | Galvanized sheet resistance spot welding method and welding device |
| CN113399907A (en) * | 2021-05-24 | 2021-09-17 | 中国电子科技集团公司第十一研究所 | Welding method for weldment on Dewar shell |
| CN113564475A (en) * | 2021-07-28 | 2021-10-29 | 攀钢集团研究院有限公司 | Preparation method and welding method of zinc-aluminum-magnesium plating plate |
| CN114786861A (en) * | 2019-12-06 | 2022-07-22 | Posco公司 | Method for manufacturing welded structure and welded structure manufactured thereby |
| CN115138956A (en) * | 2022-07-20 | 2022-10-04 | 湖北超卓航空科技股份有限公司 | Steel core composite electrode for high-elasticity alloy and spot welding process thereof |
| CN115178845A (en) * | 2021-04-06 | 2022-10-14 | 上海汽车集团股份有限公司 | Calculation method of welding parameters of resistance spot welding and welding parameter control system |
| CN115283803A (en) * | 2021-05-04 | 2022-11-04 | 通用汽车环球科技运作有限责任公司 | System and method for resistance spot welding for manufacturing workpieces |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103111741A (en) * | 2012-12-21 | 2013-05-22 | 上海交通大学 | Controllable electrode force method for lowering welding spatter of resistance spot welding of sandwich plate |
| CN107914056B (en) * | 2017-11-20 | 2020-08-11 | 苏州安洁科技股份有限公司 | Welding process for improving flatness of welding head |
| CN109352155A (en) * | 2018-11-16 | 2019-02-19 | 上海交通大学 | For improving the welding procedure of zinc-plated super-high strength steel resistance spot welding welding quality |
| CN110142492A (en) * | 2019-06-06 | 2019-08-20 | 武汉钢铁有限公司 | Without splashing Progress in Automobile Galvanized Steel Sheets resistance spot welding method |
| CN114786861A (en) * | 2019-12-06 | 2022-07-22 | Posco公司 | Method for manufacturing welded structure and welded structure manufactured thereby |
| CN114786861B (en) * | 2019-12-06 | 2023-11-03 | Posco公司 | Method for producing welded structure and welded structure produced thereby |
| CN115178845A (en) * | 2021-04-06 | 2022-10-14 | 上海汽车集团股份有限公司 | Calculation method of welding parameters of resistance spot welding and welding parameter control system |
| CN115283803A (en) * | 2021-05-04 | 2022-11-04 | 通用汽车环球科技运作有限责任公司 | System and method for resistance spot welding for manufacturing workpieces |
| CN115283803B (en) * | 2021-05-04 | 2023-06-27 | 通用汽车环球科技运作有限责任公司 | System and method for resistance spot welding of a workpiece |
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| CN113399907A (en) * | 2021-05-24 | 2021-09-17 | 中国电子科技集团公司第十一研究所 | Welding method for weldment on Dewar shell |
| CN113275724A (en) * | 2021-05-28 | 2021-08-20 | 天津津荣天宇精密机械股份有限公司 | Galvanized sheet resistance spot welding method and welding device |
| CN113564475A (en) * | 2021-07-28 | 2021-10-29 | 攀钢集团研究院有限公司 | Preparation method and welding method of zinc-aluminum-magnesium plating plate |
| CN115138956A (en) * | 2022-07-20 | 2022-10-04 | 湖北超卓航空科技股份有限公司 | Steel core composite electrode for high-elasticity alloy and spot welding process thereof |
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Application publication date: 20120919 |