CN102689112A - Novel composite active agent for magnesium alloy active tungsten-insert-gas (A-TIG) arc welding - Google Patents
Novel composite active agent for magnesium alloy active tungsten-insert-gas (A-TIG) arc welding Download PDFInfo
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- CN102689112A CN102689112A CN2012102006499A CN201210200649A CN102689112A CN 102689112 A CN102689112 A CN 102689112A CN 2012102006499 A CN2012102006499 A CN 2012102006499A CN 201210200649 A CN201210200649 A CN 201210200649A CN 102689112 A CN102689112 A CN 102689112A
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Abstract
The invention discloses a novel composite active agent for magnesium alloy active tungsten-insert-gas (A-TIG) arc welding, and belongs to an active agent welding technique. The novel composite active agent for magnesium alloy active tungsten-insert-gas arc welding provided by the invention is characterized in that the active agent is Cr2O3, and the weight proportion of the active agent is 65-70%; and a ceramic additive particle is SiC, and the weight proportion of the ceramic additive particle is 30%-35%. The novel composite active agent for magnesium alloy active tungsten-insert-gas arc welding is prepared through the following steps of: firstly grinding Cr2O3 active agent powder and the SiC ceramic particle, and mixing in proportion; then adding acetone into the mixture, so that the mixture becomes pasty; then coating the pasty active agent on the upper surface of a test sample uniformly by a flat brush, wherein the coating width is about 40mm, and the average density per square centimeter is 4-5mg; and carrying out tungsten-insert-gas (A-TIG) arc welding after the acetone is volatilized. Compared with a welding joint which is not coated with the active agent, the welding joint obtained through the welding technology has the advantages that the fusion depth is improved by 60%, an the tensile property is improved by 30%; and in addition, after the active agent is coated, crystal particles in the welding line are thinned obviously, and the difficulties that the fusion depth is shallow in the TIG arc welding, and the crystal particles of the welding line in the traditional active TIG arc welding are toughened seriously are solved.
Description
Technical field
The present invention is a kind of NEW TYPE OF COMPOSITE activating agent that is applied in the argon arc welding of magnesium alloy activating gas tungsten.It is characterized in that: before welding, earlier with Cr
2O
3Mix in proportion after activating agent powder and SiC ceramic particle are milled, in mixture, add acetone then and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg.Treat that carrying out argon tungsten-arc welding after acetone volatilizees connects.
Background technology
Magnesium alloy has series of advantages such as density is low, specific strength is high, the good and easy recovery of electromagnetic wave shielding, is called as the green engineering material of 21st century, is widely used in automobile, Aero-Space and the electronics industry.China is as magnesium resource big country, and oneself becomes one of national science and technology strategic development target the commercial application of magnesium alloy.Yet magnesium has the close-packed hexagonal crystal structure at normal temperatures, and slip system is few, and plastic deformation ability is low.These character cause the production of magnesium alloy complex structural member higher with preparation difficulty and cost.Therefore oneself becomes the focus of domestic and international research to develop the advanced interconnection technique of magnesium alloy high-quality, efficient, energy-conservation, consumption reduction.Recently, the welding method of magnesium alloy mainly concentrates on argon tungsten-arc welding (TIG), Laser Welding, friction stir welding and electron beam welding etc.Convenience and higher economical efficiency are used widely in the magnesium alloy welding procedure preferably with it for TIG weldering.But there are shortcomings such as fusion penetration shallow (≤3 mm) and welding efficiency are low in TIG weldering, needs bevel to carry out multi-pass welding for thickness greater than the sheet material of 3 mm.It is very little to the effect that increases fusion penetration to increase welding current, also can increase the loss of tungsten electrode simultaneously, causes the pollution of weld metal.Ukraine's crust institute of welding has proposed a kind of new type of welding method-activating agent welding (A-TIG) first, and has developed the activating agent that is used for titanium alloy in order to solve the problems referred to above that exist in the titanium alloy T IG welding.People such as the Fan Ding of Gansu Polytechnical Univ have developed the activating agent that is used for mild steel and stainless TIG weldering.People such as the Liu Liming of Dalian University of Technology have researched and developed the activating agent that is used for the magnesium alloy welding.
More than research mainly solves be the fusion penetration of TIG weldering more shallow with problems such as welding efficiency is low, but the magnesium alloy oxide-film is not fine and close, water imbibition is strong, has bigger pore tendency.When A-TIG welded, the adding of oxide activating agent and chloride activating agent had reduced the molten bath fluid ability, and the complicated of these metallurgical reactions might increase the possibility that produces pore.Owing to the existence of pore, greatly reduce the mechanical property of welding point.Therefore, when adopting the welding of A-TIG weldering carrying out magnesium alloy, must study removing measure, to obtain having the welding point of good combination property to various defectives.From the angle of production application, also can alleviate the workload of preparing before the TIG weldering, reduce welding cost.Therefore, press for and a kind ofly not only can increase weld penetration and improve appearance of weld but also can reduce the novel active agent that is used for the magnesium alloy TIG welding of pore.
Summary of the invention
The object of the invention provides a kind of NEW TYPE OF COMPOSITE activating agent that is applicable to the magnesium alloy TIG welding; This activating agent not only can significantly improve the fusion penetration of welding point but also effect that can its dispersion-strengtherning of crystal grain thinning, thereby reached the purpose that improves welding point tensile property and fusion area hardness.
Before carrying out traditional TIG welding, earlier with the careful polishing in welded piece surface and with alcohol wash to remove oxide and greasy dirt.With Cr
2O
3After mixing in proportion, activating agent powder and SiC ceramic particle fully mill; In the mixture of milling, adding proper amount of acetone makes it become pasty state; With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again; Coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg.Treat to carry out the TIG welding after the acetone volatilization.
Through the experimental study of a large amount of systems, we can draw to draw a conclusion: Cr
2O
3The effect that activating agent increases weld penetration is obvious, and its effect mainly is the surface tension temperature coefficient that has changed the molten bath, thereby changes the flow direction of liquid state of molten pool metal; And SiC ceramic particle and magnesium alloy mother metal have good wetting property, can play dispersion-strengtherning, the effect of crystal grain thinning.Advantage of the present invention is through Cr
2O
3The comprehensive function of activating agent powder and SiC ceramic particle had not only improved weld penetration but also refinement fusion area crystal grain.Extension test and microhardness analysis result show that when adopting this kind activating agent to carry out magnesium alloy TIG welding, the ultimate tensile strength of welding point obviously increases.
Description of drawings
Fig. 1 is the appearance of weld photo that applies the single component activating agent.
Fig. 2 is the appearance of weld photo that applies the NEW TYPE OF COMPOSITE activating agent.
Fig. 3 is the weld penetration photo that applies the single component activating agent.
Fig. 4 is the weld penetration photo that applies the NEW TYPE OF COMPOSITE activating agent.
Fig. 5 is the weld seam fusion area microscopic appearance photo that applies the single component activating agent.
Fig. 6 is the weld seam fusion area microscopic appearance photo that applies the NEW TYPE OF COMPOSITE activating agent.
Fig. 7 is the stress-strain curve diagram sheet that applies the welding point of single component activating agent and NEW TYPE OF COMPOSITE activating agent.
The specific embodiment
Example 1
Composite reactive agent weight proportion is Cr
2O
3: 65% and SiC:35%.Earlier with Cr
2O
3Mix in proportion after activating agent powder and SiC ceramic particle are fully milled, in mixture, add acetone then and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg.Treat to weld after the acetone volatilization.
To thickness of slab is that the AZ31 magnesium alloy plate of 5 mm carries out the welding conditions that the TIG welding takes and is:
Under this welding conditions condition; Compare with the welding point that applies the single component activating agent; Molten wide obviously do not change (shown in Fig. 2) of welding point after the coating activating agent, fusion penetration has improved 60% (shown in Fig. 4), and tensile property has improved 30% (as shown in Figure 7).In addition, the obvious refinement of crystal grain (as shown in Figure 6) in the weld seam after the coating NEW TYPE OF COMPOSITE activating agent has solved the difficult problem of the serious alligatoring of weld grain during the shallow and traditional active TIG of fusion penetration welds in the TIG weldering.
Example 2
Composite reactive agent weight proportion is Cr
2O
3: 68% and SiC:32%.Earlier with Cr
2O
3Mix in proportion after activating agent powder and SiC ceramic particle are fully milled, in mixture, add acetone then and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg.Treat to weld after the acetone volatilization.Welding parameter is with example 1.
Example 3
Composite reactive agent weight proportion is Cr
2O
3: 70% and SiC:30%.Earlier with Cr
2O
3Mix in proportion after activating agent powder and SiC ceramic particle are fully milled, in mixture, add acetone then and make it become pasty state.With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again, coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg.Treat to weld after the acetone volatilization.Welding parameter is with example 1.
Claims (2)
1. novel active agent that is used for the welding of magnesium alloy activating gas tungsten argon arc, characteristic of the present invention is that activating agent is by C
2O
3Activating agent and SiC ceramic particle are formed, and its weight proportion is C
2O
3: 65%～70% and SiC: 30%～35%.
2. characteristic of the present invention is earlier with Cr
2O
3After milling, activating agent powder and SiC ceramic particle mix in proportion; In mixture, adding acetone then makes it become pasty state; With flat hairbrush the pasty state activating agent evenly is coated in the sample upper surface again; Coating width is about 40 mm, and every square centimeter of averag density is 4-5 mg, treats to carry out the welding of activating gas tungsten argon arc after the acetone volatilization.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900495A (en) * | 2017-11-27 | 2018-04-13 | 重庆大学 | A kind of novel active tungsten argon arc welding method for magnesium alloy |
| CN108032002A (en) * | 2017-11-27 | 2018-05-15 | 重庆大学 | A kind of mixed active agent for magnesium alloy activating-tungsten inert gas welding |
| CN108098115A (en) * | 2017-11-27 | 2018-06-01 | 重庆大学 | It is a kind of to connect method for the nanometer enhancing activating-tungsten inert gas welding of magnesium alloy |
| CN108115310A (en) * | 2017-11-27 | 2018-06-05 | 重庆大学 | A kind of nanometer enhancing activating agent connect for magnesium alloy activating-tungsten inert gas welding |
Citations (3)
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| CN101244497A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Activator for magnesium alloy welding |
| CN101947703A (en) * | 2010-10-08 | 2011-01-19 | 中国航空工业集团公司北京航空制造工程研究所 | Active welding flux for high-temperature alloy fusion welding and preparation method thereof |
| CN102886625A (en) * | 2012-10-16 | 2013-01-23 | 重庆理工大学 | Efficient active agent used for aluminum alloy alternating current TIG (tungsten inert gas) welding |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101244497A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Activator for magnesium alloy welding |
| CN101947703A (en) * | 2010-10-08 | 2011-01-19 | 中国航空工业集团公司北京航空制造工程研究所 | Active welding flux for high-temperature alloy fusion welding and preparation method thereof |
| CN102886625A (en) * | 2012-10-16 | 2013-01-23 | 重庆理工大学 | Efficient active agent used for aluminum alloy alternating current TIG (tungsten inert gas) welding |
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| 刘黎明等: "活性剂对镁合金TIG焊接熔深的影响", 《金属学报》 * |
| 孙昊: "镁合金活性激光焊及颗粒增强活性电弧焊研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900495A (en) * | 2017-11-27 | 2018-04-13 | 重庆大学 | A kind of novel active tungsten argon arc welding method for magnesium alloy |
| CN108032002A (en) * | 2017-11-27 | 2018-05-15 | 重庆大学 | A kind of mixed active agent for magnesium alloy activating-tungsten inert gas welding |
| CN108098115A (en) * | 2017-11-27 | 2018-06-01 | 重庆大学 | It is a kind of to connect method for the nanometer enhancing activating-tungsten inert gas welding of magnesium alloy |
| CN108115310A (en) * | 2017-11-27 | 2018-06-05 | 重庆大学 | A kind of nanometer enhancing activating agent connect for magnesium alloy activating-tungsten inert gas welding |
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Application publication date: 20120926 |