CN105478978A - High-fusion-depth welding process of projection welding nut - Google Patents
High-fusion-depth welding process of projection welding nut Download PDFInfo
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- CN105478978A CN105478978A CN201410476506.XA CN201410476506A CN105478978A CN 105478978 A CN105478978 A CN 105478978A CN 201410476506 A CN201410476506 A CN 201410476506A CN 105478978 A CN105478978 A CN 105478978A
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Abstract
The invention discloses a high-fusion-depth welding process of a projection welding nut. The process comprises the steps of material preparation, check of welding parameters, loading, welding, post-heating and inspection of a welding product, wherein the section of a lower electrode is reduced to enable the epitaxy of the section to become a circumcircle of a quadrangle formed by four welding feet of a nut in the material preparation process, and meanwhile, the length of the lower electrode is increased. The process has the following main beneficial effects: (1) the performance requirements of high-strength welding nut are satisfied; (2) the equipment resource is effectively used; and under limited conditions of traditional projection welding equipment, the technical requirements of high-strength projection welding nut and customers on products are satisfied.
Description
Technical field
The present invention relates to a kind of project-welding nut height penetration welding technique, belong to parts assembly projection welding process.
Background technology
At present, common nut-welding technique is all adopt common projection welding device and frock to operate, and welding procedure is ripe.But, rely on such welding manner cannot meet the welding performance requirement of this high penetration welding nut part.Because nut leg is short, and inconsistent with sheet material.Opposing nut fusing point is lower than sheet material fusing point.Under same current conditions, sheet material is very easily caused not yet to melt and the situation that nut leg has melted.Find there is no fusion penetration between sheet material and nut after the section of gold picture, cause weld strength to be difficult to ensure.The welding equipment now used is common projection welder and welding tooling, and welding current peak value is low and output is unstable.Welding tooling upper/lower electrode contact surface is large, transient current causes welded condition instability, poor welding quality by less.
Summary of the invention
The object of the present invention is to provide a kind of project-welding nut height penetration welding technique, to solve the problems referred to above existing in prior art.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of project-welding nut height penetration welding technique, it comprises the steps:
Get the raw materials ready: prepare part to be welded, welded nut, welding tooling;
Check welding parameter: described welding parameter comprises weld interval, welding current, after heat time, post-heating current;
Material loading: part to be welded is placed on welding tooling, puts welded nut;
Welding: press welding switch, welding machine starts welding, takes off part after completing;
After heat: the part after welding is welded 20ms under the electric current of 20000A;
Inspection welding product; Weldment is cut and makes sample and use gold as microscopic examination welding penetration.
Wherein, in described melting process, the cross section of bottom electrode is reduced with make the extension in described cross section become nut four legs form the circumscribed circle of quadrangle, the length of bottom electrode is elongated simultaneously.
Preferably, the technological parameter of described welding is welding current is 31000A, and weld interval is 30ms.
Preferably, lead to the electric current of 200A before welding to nut, time 30ms, nut surface zinc layers is first gasified by nut before formal thawing, improves welding effect;
Preferably, inversion intermediate frequency direct current welding equipment is selected in described welding, although common secondary commutation welding machine also can arrange rear thermal parameter, but medium frequency welding function is accurate to 1ms the after heat time, welding current is accurate to 100A, because after heat is just in order to stable crystal structure, therefore 1500 DEG C about about 800 DEG C that postheat temperature is dissolved lower than steel.
Preferably, described feeding process is that top electrode, nut and bottom electrode are superposed placement from top to bottom successively.
In welding parameter, increase after heat element, make to be divided into twice by originally single welding current.When push switch, first welding runs welding parameter makes leg and sheet material dissolve, and after weld, welding machine carries out after heat at once and operates and carry out firmly the crystal of weldment.
Beneficial effect of the present invention is mainly reflected in:
1. meet the performance requirement of high-intensity welding nut;
2. effective utilization of device resource, under the limited conditions of existing projection welding device, meets high strength project-welding nut and client to the technical requirement of product.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Detailed description of the invention
A kind of project-welding nut height penetration welding technological process of the present invention as shown in Figure 1, comprises the steps:
One, get the raw materials ready: prepare part to be welded, welded nut, welding tooling, the cross section of bottom electrode is reduced with make the extension in described cross section become nut four legs form the circumscribed circle of quadrangle, the length of bottom electrode is elongated simultaneously, the welding region of sheet material is tried one's best accumulation of energy, and makes heat be not easy to dissipate;
Two, check welding parameter: welding parameter comprise 30ms preheating time, preheat curent 200A, weld interval 30ms, welding current 31000A, after heat time 20ms, post-heating current 20000A, as shown in table 1;
Three, material loading: part to be welded is placed on welding tooling, puts welded nut;
Four, also can lead to 200A electric current to nut before welding, the time is that 30ms carries out preheating, nut surface zinc layers is first gasified by nut before formal thawing, improves welding effect.
Five, weld: select inversion direct current intermediate-frequency welding machine, press welding switch, welding machine starts welding, take off part after completing, although common secondary commutation welding machine also can arrange rear thermal parameter, medium frequency welding function is accurate to 1ms the after heat time, welding current is accurate to 100A, in addition, because after heat is just in order to stable crystal structure, therefore 1500 DEG C about about 800 DEG C that postheat temperature is dissolved lower than steel.
Six, after heat: the part after welding is welded 20ms under the electric current of 20000A;
Seven, welding product is checked; Weldment is cut and makes sample and use gold as microscopic examination welding penetration, underproof product is done over again.
Table 1
Beneficial effect of the present invention is mainly reflected in:
1. meet the performance requirement of high-intensity welding nut;
2. effective utilization of device resource, under the limited conditions of existing projection welding device, meets high strength project-welding nut and client to the technical requirement of product.
The technology of the present invention has dropped in normal weld production at present, which replace traditional nut spot welding technique, and weld strength is better than traditional spot welding nut processing performance, have passed the inspection of gold picture test, meets the solder technology requirement of assembly part.
In sum, be only preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of doing according to shape, structure, feature and the spirit described in the claims in the present invention scope change and modify, and all should be included in right of the present invention.
Claims (5)
1. a project-welding nut height penetration welding technique, is characterized in that, comprise the steps:
Get the raw materials ready: prepare part to be welded, welded nut, welding tooling;
Check welding parameter: described welding parameter comprises weld interval, welding current, after heat time, post-heating current;
Material loading: part to be welded is placed on welding tooling, puts welded nut;
Welding: press welding switch, welding machine starts welding, takes off part after completing;
After heat: the part after welding is welded 20ms under the electric current of 20000A;
Inspection welding product; Weldment is cut and makes sample and use gold as microscopic examination welding penetration;
Wherein, in described melting process, the cross section of bottom electrode is reduced with make the extension in described cross section become nut four legs form the circumscribed circle of quadrangle, the length of bottom electrode is elongated simultaneously.
2. welding procedure as claimed in claim 1, it is characterized in that, the technological parameter of described welding is welding current is 31000A, and weld interval is 30ms.
3. welding procedure as claimed in claim 1, is characterized in that, before described welding operation starts, nut is led to the electric current 30ms of 200A.
4. welding procedure as claimed in claim 1, it is characterized in that, inversion intermediate frequency direct current welding equipment is selected in described welding.
5. welding procedure as claimed in claim 1, it is characterized in that, described feeding process is that top electrode, nut and bottom electrode are superposed placement from top to bottom successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410476506.XA CN105478978A (en) | 2014-09-18 | 2014-09-18 | High-fusion-depth welding process of projection welding nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410476506.XA CN105478978A (en) | 2014-09-18 | 2014-09-18 | High-fusion-depth welding process of projection welding nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105478978A true CN105478978A (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410476506.XA Pending CN105478978A (en) | 2014-09-18 | 2014-09-18 | High-fusion-depth welding process of projection welding nut |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107322241A (en) * | 2017-07-04 | 2017-11-07 | 合肥安力电力工程有限公司 | A kind of nut-welding technique |
| CN108747064A (en) * | 2017-04-18 | 2018-11-06 | 上海交通大学 | Resistance projection-welding composite connecting method and its system |
| CN111673253A (en) * | 2020-06-12 | 2020-09-18 | 昆山荣仕杰智能装备科技有限公司 | Nut projection welding process suitable for high-yield-strength plate |
| CN112355454A (en) * | 2020-09-25 | 2021-02-12 | 重庆至信实业集团有限公司 | Girth welding process and equipment based on large-diameter fastener |
-
2014
- 2014-09-18 CN CN201410476506.XA patent/CN105478978A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108747064A (en) * | 2017-04-18 | 2018-11-06 | 上海交通大学 | Resistance projection-welding composite connecting method and its system |
| CN107322241A (en) * | 2017-07-04 | 2017-11-07 | 合肥安力电力工程有限公司 | A kind of nut-welding technique |
| CN111673253A (en) * | 2020-06-12 | 2020-09-18 | 昆山荣仕杰智能装备科技有限公司 | Nut projection welding process suitable for high-yield-strength plate |
| CN112355454A (en) * | 2020-09-25 | 2021-02-12 | 重庆至信实业集团有限公司 | Girth welding process and equipment based on large-diameter fastener |
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Application publication date: 20160413 |