CN102626815A - Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium - Google Patents
Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium Download PDFInfo
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- CN102626815A CN102626815A CN2012101140363A CN201210114036A CN102626815A CN 102626815 A CN102626815 A CN 102626815A CN 2012101140363 A CN2012101140363 A CN 2012101140363A CN 201210114036 A CN201210114036 A CN 201210114036A CN 102626815 A CN102626815 A CN 102626815A
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Abstract
The invention discloses a novel alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metals of iron and aluminium. The alternating-current MIG welding enables a base metal to be in a state with continuous change between a positive electrode and a negative electrode by power control, so that the heat input of the base metal in the welding process can be reduced, the thickness of fragile compounds between the metals of iron and aluminium can be reduced, and the mechanical property of welding joints is improved. Simultaneously, the alternating-current double-pulse MIG welding applies two types of pulses with different frequencies (one is high and the other is low) to current in the welding process; and due to the oscillation action of the double-pulse mode on a molten pool, the quantity of gas holes in an aluminium welding seam is reduced; and fish scales are formed on the surface of the welding seam, and the mechanical property of the dissimilar metal joints of iron and aluminium is effectively improved.
Description
Technical field
The present invention relates to the arc welding metal field, particularly a kind of interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding.
Background technology
Current communications and transportation industrial development is rapid, brings great convenience for people's life.But meanwhile a large amount of uses of the maximum dimensions of vehicle of aircraft and automobile cause the use of a large amount of fossil fuels, have aggravated the pollution of environment.So in order to reach the purpose of sustainable development, select for use light metal to replace heavy metal, the own wt that under the prerequisite that guarantees mechanical property, reduces delivery vehicle can effectively improve the service efficiency of fossil fuel, reduces greenhouse gas emission as far as possible.Aluminium alloy is because himself excellent mechanical property can partly replace iron and steel to use as frame structure, so welding aluminum alloy and iron and steel just can obtain the good comprehensive mechanical property of these two kinds of metals.
The method of iron aluminum dissimilar metal welding at present mainly comprises friction welding (FW), Laser Welding and arc welding.The joint mechanical property that friction welding (FW) obtains is better, but the size and dimension of joint can be restricted.Laser Welding and arc welding applied range, but the hot input quantity of these two kinds of welding is bigger, can make iron aluminium interface produce compound between the thicker brittle metal of one deck, influences joint mechanical property.
List of references:
1. T.Ogura,?Y.?Saito,?T.?Nishida,?Scripta?Mater.?66?(2012)?531
2. H.?T.?Zhang,?J.?C.?Feng,?P.?He,?Mater.?Sci.?Technol.?24?(2008)?1346
3. L.Agudo,?D.?Eyidi,?J.?Mater.?Sci.?42?(2007)?4205
4. S.B.?Lin,?J.L.?Song,?C.L.?Yang,?C.L.?Fan,?D.W.?Zhang,?Mater.?Des.?31?(2010)?2637?。
Summary of the invention
To the deficiency of above-mentioned prior art, the present invention provides a kind of interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal, has improved the mechanical property of welding point.
A kind of interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding, it is characterized in that this method comprises: monolithic metal is fixed on the workbench in welding process; Metal aluminum sheet places iron plate to go up the 10mm-20mm place with the mode of overlap joint, and uses clamps; Aim at the edge of this metal aluminum sheet with exchanging dipulse MIG welding gun, workbench moves with preset speed.
Welding current is an alternating current, and intensity is 55A, and weldingvoltage is 16.2V, alternately exports high-frequency pulse current signal and low frequency pulse current signal in the welding process.
The frequency of described high-frequency pulse current signal is higher than 100Hz, and the frequency of described low frequency pulse current signal is lower than 30Hz.
The welding gun height is 15mm to 20mm, and the welding gun head tilts between 1 ° to 45 ° to described metal aluminum sheet, and the working table movement direction tilts between 1 ° to 45 ° dorsad.
Said preset speed moves and is 500mm/min.
Compared with prior art, the invention has the beneficial effects as follows:
Exchange the MIG weldering and make base metals be in the anodal state that constantly changes with negative pole, and then can reduce the hot input quantity of mother metal in the welding process, reduce the thickness of frangible compounds between the iron aluminum metal, improved the mechanical property of welding point through power supply control.Exchange dipulse MIG simultaneously and be welded in the welding process pulse that electric current has been applied one high and one low two kinds of different frequencies; This double pulse modes has reduced the quantity of pore in the aluminium weld seam to the concussion effect in molten bath; Make face of weld form scalelike mark, improve the mechanical property of iron aluminum dissimilar metal joint effectively.
The characteristics of existing direct current MIG welding method welding iron aluminum dissimilar metal are that hot input quantity is bigger; In welding xenogenesis iron aluminium sheet process, make bath temperature too high; Iron plate and motlten metal reactive aluminum speed can be aggravated, compd A l between the brittle metal of iron aluminium interface generation
3Fe, Al
5Fe
2Thickness bigger, can lower the mechanical property of welding point.
Description of drawings
Fig. 1 is the interchange dipulse MIG welding sketch map that is used for iron, aluminum dissimilar metal welding.
Fig. 2 exchanges dipulse MIG weldering and the welding point intermetallic compound thickness contrast that exchanges pulse MIG weldering.
Fig. 3 exchanges dipulse MIG weldering and exchanges pulse MIG weldering welding point stress strain curve.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.
Please consult Fig. 1 earlier; Fig. 1 is the interchange dipulse MIG welding sketch map that is used for iron, aluminum dissimilar metal welding; As shown in the figure, a kind of interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding, comprising: monolithic metal 1 is fixed on the workbench in welding process; Metal aluminum sheet 2 places 10mm-20mm place on the iron plate 1 with the mode of overlap joint, and uses clamps; Aim at the edge of this metal aluminum sheet 2 with exchanging dipulse MIG welding gun 3, workbench moves with the speed of 500mm/min.
Before the welding beginning electric current output mode is adjusted to the interchange double pulse modes, and welding current, weldingvoltage, protection throughput, working table movement speed and low-frequency pulse frequency are set.Welding current is an alternating current, and intensity is 55A, and weldingvoltage is 16.2V, alternately exports high-frequency pulse current signal and low frequency pulse current signal in the welding process.Be fixed on the workbench monolithic metal and metal aluminum sheet as shown in Figure 1; And the height and the angle of regulating welding gun; The welding gun height is 15mm to 20mm, and the welding gun head tilts between 1 ° to 45 ° to described metal aluminum sheet, and the working table movement direction tilts between 1 ° to 45 ° dorsad.After accomplishing above-mentioned preparation, play arc welding.
Exchange between the welding point brittle metal that double pulse modes obtains compound thickness and compare and exchange single pulse mode and from about 10 μ m, be reduced to about 3 μ m, as shown in Figure 2.And tensile strength is also brought up to 200Mpa from 80Mpa, and is as shown in Figure 3.
Claims (5)
1. interchange dipulse MIG welding method that is used for the welding of iron, aluminum dissimilar metal, it is characterized in that this method comprises: monolithic metal in welding process (1) is fixed on the workbench; Metal aluminum sheet (2) places this iron plate (1) to go up the 10mm-20mm place with the mode of overlap joint, and uses clamps; To exchange dipulse MIG welding gun (3) and aim at the edge of this metal aluminum sheet (2), workbench moves with preset speed.
2. the interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding according to claim 1; It is characterized in that welding current is an alternating current, intensity is 55A; Weldingvoltage is 16.2V, alternately exports high-frequency pulse current signal and low frequency pulse current signal in the welding process.
3. the interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding according to claim 2 is characterized in that the frequency of described high-frequency pulse current signal is higher than 100Hz, and the frequency of described low frequency pulse current signal is lower than 30Hz.
4. the interchange dipulse MIG welding method that is used for iron, aluminum dissimilar metal welding according to claim 1; It is characterized in that; The welding gun height is 15mm to 20mm, and the welding gun head tilts between 1 ° to 45 ° to described metal aluminum sheet, and the working table movement direction tilts between 1 ° to 45 ° dorsad.
5. the interchange dipulse MIG welding method that is used for the welding of iron, aluminum dissimilar metal according to claim 1 is characterized in that said preset speed moves and is 500mm/min.
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| CN2012101140363A CN102626815A (en) | 2012-04-18 | 2012-04-18 | Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium |
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| CN2012101140363A CN102626815A (en) | 2012-04-18 | 2012-04-18 | Alternating-current double-pulse MIG (Metal-Inert Gas) welding method for dissimilar metal welding of iron and aluminium |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526661A (en) * | 2018-03-15 | 2018-09-14 | 沪东中华造船(集团)有限公司 | A kind of Ni-based solid welding wire gas-shield welding method |
| CN109807420A (en) * | 2019-03-26 | 2019-05-28 | 中南大学 | Aluminum/steel dissimilar metal low power laser couples DP-MIG melt-brazing method |
| CN110919137A (en) * | 2019-11-14 | 2020-03-27 | 西安和光明宸科技有限公司 | Welding method for reducing welding seams |
| CN111822825A (en) * | 2020-07-15 | 2020-10-27 | 北京博清科技有限公司 | Upward welding process for plates |
| WO2021135494A1 (en) * | 2019-12-31 | 2021-07-08 | 华南理工大学 | Method and system for modulating high-low frequency double-pulsed mig welding waveform having flexible transition |
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2012
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Patent Citations (4)
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| JPS63281777A (en) * | 1987-05-13 | 1988-11-18 | Sansha Electric Mfg Co Ltd | Power unit for ac arc welding machine |
| DE4023419A1 (en) * | 1990-07-23 | 1992-02-06 | Hitachi Seiko Kk | Tig welding control - adjusts frequency of welding current to electrode to set penetration depth |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526661A (en) * | 2018-03-15 | 2018-09-14 | 沪东中华造船(集团)有限公司 | A kind of Ni-based solid welding wire gas-shield welding method |
| CN108526661B (en) * | 2018-03-15 | 2020-08-07 | 沪东中华造船(集团)有限公司 | Gas shielded welding method for nickel-based solid welding wire |
| CN109807420A (en) * | 2019-03-26 | 2019-05-28 | 中南大学 | Aluminum/steel dissimilar metal low power laser couples DP-MIG melt-brazing method |
| CN110919137A (en) * | 2019-11-14 | 2020-03-27 | 西安和光明宸科技有限公司 | Welding method for reducing welding seams |
| WO2021135494A1 (en) * | 2019-12-31 | 2021-07-08 | 华南理工大学 | Method and system for modulating high-low frequency double-pulsed mig welding waveform having flexible transition |
| CN111822825A (en) * | 2020-07-15 | 2020-10-27 | 北京博清科技有限公司 | Upward welding process for plates |
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Application publication date: 20120808 |