CN102689111A - High-performance magnesium alloy welding active agent - Google Patents
High-performance magnesium alloy welding active agent Download PDFInfo
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- CN102689111A CN102689111A CN2012102005570A CN201210200557A CN102689111A CN 102689111 A CN102689111 A CN 102689111A CN 2012102005570 A CN2012102005570 A CN 2012102005570A CN 201210200557 A CN201210200557 A CN 201210200557A CN 102689111 A CN102689111 A CN 102689111A
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Abstract
The invention discloses a novel active agent for improving the welding performance of magnesium alloy argon tungsten-arc welding, belonging to the welding technology of active agents. The novel active agent is characterized by consisting of MnCl2 and ZnO, wherein the active agent has the weight ratio of MnCl2 to ZnO of (65%-75%); (25%-35%). A preparation method of the novel active agent comprises the following steps of: grinding MnCl2 and ZnO active agent powder, mixing in proportion, and adding acetone into a mixture, so that the active agent is pasty; evenly coating the pasty active agent on the surface of a sample by a flat hair bush, wherein the coating width is about 40mm, and the average coating quantity of the active agent is 6mg/cm<-2>; and carrying out argon tungsten-arc welding after the acetone is volatilized. Compared with the welding joint which is uncoated with the active agent, the tensile property of the welding joint obtained by the welding technology is improved by 22.8%. Compared with the welding joint which is coated with the single active agent, the tensile property of the welding joint is improved by 60.7%. The difficulties of the high possibility of the narrow melting depth in the magnesium alloy TIG (tungsten-arc welding) welding and the high possibility of the coarse crystalline grains in the A-TIG (argon tungsten-arc welding) welding can be solved.
Description
Technical field
A kind of novel active agent that is used to improve magnesium alloy argon tungsten-arc welding welding performance.Comprise following process, it is characterized in that: before welding, earlier with MnCl
2Mix in proportion after milling with ZnO activating agent powder, 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 the average coating amount of activating agent is 6 mg cm
-2Treat that carrying out argon tungsten-arc welding after acetone volatilizees connects.
Background technology
Magnesium alloy is with its low-gravity, good processing characteristics, abundant natural reserves and receive people's concern day by day.Compare with other metal material and engineering plastics, magnesium alloy has high specific strength and specific stiffness, good damping shock absorption property, electromagnetic wave shielding, machining property and casting character.Magnesium alloy will become most important commercial lightweight structural material of 21 century.The extensive use of magnesium alloy must relate to connectivity problem, and welding also receives much concern as a kind of important method of attachment naturally.The TIG weldering is the common method that is used for being welded with non-ferrous metal, stainless steel, nickel-base alloy, titanium alloy etc materials.Its advantage is that welding quality is high, almost can be used for the connection of all metals.But also there is the shortcoming that welding penetration is shallow, production efficiency is low in the TIG weldering.In the 60's of last century; The expert of Ukraine's crust institute of welding influences this phenomenon of weld penetration according to trace element in the weld seam; Before welding, will contain some micro-activated rosin flux is coated on the surface of the work to be welded and welds; In order to influencing the shape of weld seam, thereby reach the purpose of controlling weld shape selectively, achievement in research subsequently progressively forms initial A-TIG welding procedure.Wherein people such as Marya has studied the influence of chloride to straight polarity direct current A-TIG weldering.People such as Zhang Zhaodong have studied oxide and halide to exchanging the influence of A-TIG weldering, and people such as Xu Jie have studied oxide and chloride can obtain to weld than general T IG 3 times fusion penetration to the influence application of active agents in the welding of steel that exchanges the A-TIG that fills silk and weld fusion penetration and seam organization.
More than research mainly solves be the fusion penetration of TIG weldering more shallow with problems such as welding efficiency is low, but in the active weldering process of magnesium alloy because the covering of activating agent often causes harmful effect to welding joint microstructure and performance.For example: because the activating agent poor thermal conductivity covers weld pool surface, make the thermograde in molten bath reduce, the molten bath cooling velocity reduces, and has caused the serious alligatoring of magnesium alloy fusion area crystal grain.This phenomenon all greatly reduces the mechanical property of welding point.Therefore, when adopting the welding of A-TIG weldering carrying out magnesium alloy, must research and solve the measure of magnesium alloy fusion area grain coarsening, to obtain having the welding point of good combination property.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 strengthen the novel active agent that is used for the magnesium alloy TIG welding of property of welded joint.
Summary of the invention
The object of the invention provides a kind of novel active agent that is applicable to magnesium alloy TIG welding, this activating agent not only can significantly improve welding point fusion penetration but also can refinement mother metal crystal grain, thereby reach the purpose that improves the welding point tensile property.
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 MnCl
2Fully mill after mixing in proportion with ZnO activating agent powder, 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 the average coating amount of activating agent is 6 mg cm
-2。Treat that carrying out argon tungsten-arc welding after acetone volatilizees connects.
Through the experimental study of a large amount of systems, we can draw to draw a conclusion: MnCl
2The effect that increases weld penetration with the mixed active agent of ZnO activating agent is more obvious than single-activity agent, and this is the result of " electric arc contraction " and " Marangoni convection current " comprehensive function; Thereby and along with Marangoni to flow into the molten bath Mn and the Zn element mechanical property that can influence magnesium alloy weld joint with molten pool metal generation metallurgical reaction refinement weld grain.Advantage of the present invention is through MnCl
2With the comprehensive function of ZnO activating agent, can significantly improve the mechanical property that weld penetration can improve magnesium alloy weld joint again.Extension test is the result show, 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 of uncoated activating agent.
Fig. 2 is the appearance of weld photo after the agent of coating single-activity.
Fig. 3 is the appearance of weld photo after the agent of coating composite reactive.
Fig. 4 is the seam cross-section fusion penetration photo of uncoated activating agent.
Fig. 5 is the seam cross-section fusion penetration photo after the agent of coating single-activity.
Fig. 6 is the seam cross-section fusion penetration photo after the agent of coating composite reactive.
Fig. 7 does not apply activating agent weld seam fusion area microstructure picture.
Fig. 8 applies single-activity agent weld seam fusion area microstructure picture.
Fig. 9 applies composite reactive agent weld seam fusion area microstructure picture.
Figure 10 is the stress-strain diagram that applies activating agent front and back welding point.
The specific embodiment
Example 1
The activating agent weight proportion is MnCl
2: 70% and ZnO:30%.Earlier with MnCl
2Mix in proportion after fully milling with ZnO activating agent powder, 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 the average coating amount of activating agent is 6 mg cm
-2Treat to weld after the acetone volatilization.
To thickness of slab is that the AZ31 magnesium alloy plate of 6 mm carries out the welding conditions that the TIG welding takes and is:
Under this welding conditions condition, apply the composite reactive agent after molten reductions little, face of weld ripple moist (Fig. 1-3).The weld penetration that applies the composite reactive agent has increased by 62.5% than the weld penetration that does not apply activating agent, has increased by 30% (Fig. 4-6) than the weld penetration that applies the single-activity agent.Weld seam fusion area crystal grain obviously reduces (Fig. 7-9) than the weld seam fusion area crystal grain that applies the single-activity agent after applying the composite reactive agent.Welding point tensile property after the agent of coating composite reactive has improved 22.8% than common welding point, has improved 60.7% (Figure 10) than the welding point after the agent of coating single-activity.Solved the fusion penetration that occurs easily in the magnesium alloy TIG welding shallow with the A-TIG weldering in the crystal grain thick difficult problem that occurs easily.
Example 2
The activating agent weight proportion is MnCl
2: 65% and CaF
2: ZnO.Earlier with MnCl
2Mix in proportion after fully milling with ZnO activating agent powder, 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 the average coating amount of activating agent is 6 mg cm
-2Treat to weld after the acetone volatilization; Welding parameter is with example 1.
Example 3
The activating agent weight proportion is MnCl
2: 75% and ZnO:25%.Earlier with MnCl
2Mix in proportion after fully milling with ZnO activating agent powder, 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 the average coating amount of activating agent is 6 mg cm
-2Treat to weld after the acetone volatilization; Welding parameter is with example 1.
Example 4
Earlier with MnCl
2Adding acetone after the activating agent powder is fully milled 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 the average coating amount of activating agent is 6 mg cm
-2Treat 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 tungsten argon arc, characteristic of the present invention is that activating agent is by MnCl
2Form with ZnO, its weight proportion is TiO
2: 65%～75% and CaF
2: 25%～35%.
2. characteristic of the present invention is earlier the activating agent powder to be mixed according to right 1 described ratio and fully mill; In the activating agent powder, add proper amount of acetone then; 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 the average coating amount of activating agent is 6 mg cm
-2, treat that carrying out argon tungsten-arc welding after acetone volatilizees connects.
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| CN2012102005570A CN102689111A (en) | 2012-06-18 | 2012-06-18 | High-performance magnesium alloy welding active agent |
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|---|---|---|---|
| CN2012102005570A CN102689111A (en) | 2012-06-18 | 2012-06-18 | High-performance magnesium alloy welding active agent |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008845A (en) * | 2012-12-13 | 2013-04-03 | 重庆大学 | Novel nano-particle reinforced active tungsten argon arc welding method |
| CN103317258A (en) * | 2013-07-12 | 2013-09-25 | 兰州理工大学 | Active agent for aluminum alloy active TIG welding and using method |
| 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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|---|---|---|---|---|
| CN1974112A (en) * | 2006-12-12 | 2007-06-06 | 南京航空航天大学 | Surfactant for magnesium alloy TIG welding and its prepn process and usage |
| CN101244489A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Active welding method for filler wire welding |
| CN101244497A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Activator for magnesium alloy welding |
| CN102343489A (en) * | 2011-07-11 | 2012-02-08 | 重庆大学 | Novel active agent used for TIG (Tungsten Inert Gas) welding of magnesium alloy |
-
2012
- 2012-06-18 CN CN2012102005570A patent/CN102689111A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974112A (en) * | 2006-12-12 | 2007-06-06 | 南京航空航天大学 | Surfactant for magnesium alloy TIG welding and its prepn process and usage |
| CN101244489A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Active welding method for filler wire welding |
| CN101244497A (en) * | 2007-02-12 | 2008-08-20 | 大连理工大学 | Activator for magnesium alloy welding |
| CN102343489A (en) * | 2011-07-11 | 2012-02-08 | 重庆大学 | Novel active agent used for TIG (Tungsten Inert Gas) welding of magnesium alloy |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008845A (en) * | 2012-12-13 | 2013-04-03 | 重庆大学 | Novel nano-particle reinforced active tungsten argon arc welding method |
| CN103317258A (en) * | 2013-07-12 | 2013-09-25 | 兰州理工大学 | Active agent for aluminum alloy active TIG welding and using method |
| CN103317258B (en) * | 2013-07-12 | 2015-07-08 | 兰州理工大学 | Active agent for aluminum alloy active TIG welding |
| 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 |