CN109759703A - A kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate - Google Patents
A kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate Download PDFInfo
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- CN109759703A CN109759703A CN201910192672.XA CN201910192672A CN109759703A CN 109759703 A CN109759703 A CN 109759703A CN 201910192672 A CN201910192672 A CN 201910192672A CN 109759703 A CN109759703 A CN 109759703A
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Abstract
The method that the present invention discloses a kind of welding of AZ91 magnesium alloy ultra-fine crystalline substance plate, the CO2 Laser Output Beam mode used is TEM01, optical maser wavelength is 10.6 μm, and lasing beam diameter 30~40mm, the CO2 laser depth of focus L used are 0.8~1.0mm for 0.2~0.5mm and focus diameter d before focusing；Welding current is 5~7A, and speed of welding is 1~8m/min.The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate of the invention is not necessarily to special device or equipment, it is at low cost, by the size relationship between research speed of welding, welding current and fusion penetration, avoids AZ91 magnesium alloy ultra-fine crystalline substance plate and phenomena such as weld crack, undercut, stomata, pit and not weld penetration often occur.Good welding performance is easy to promote and apply.
Description
Technical field
The present invention relates to materials processing engineering fields, more particularly, to a kind of weldering of AZ91 magnesium alloy ultra-fine crystalline substance plate
The method connect.
Background technique
Laser welding is a kind of high-efficiency and precision welding method using the laser beam of high-energy density as heat source.Laser Welding
Connect be Materialbearbeitung mit Laserlicht technical application one of importance.It is mainly used for the 1970s welding thin-walled material and low speed
Welding, welding process category heat-conduction-type, i.e. laser emission heat workpiece surface, and surface heat is internally spread by heat transfer,
The parameters such as width, energy, peak power and repetition rate by control laser pulse, melt workpiece, are formed specific molten
Pond.Due to its unique advantage, it has been successfully applied in micro-, small parts precision welding.
AZ91 magnesium alloy ultra-fine crystalline substance plate with laser welding condition not only directly affects the Solidification Structures in molten bath area
With metallurgical reaction condition, and the microstructure evolution and thermal cycle situation of heat affected area and incomplete fusion zone are also determined.If Welder
Skill parameter selection is improper, it may appear that phenomena such as weld crack, undercut, stomata, pit and not weld penetration.Therefore, reasonable Welder
Skill condition can be very good to guarantee the welding quality and mechanical property of welding point.Therefore, for such welding, to welding
Condition requirement is more stringent, needs to formulate more accurate technological specification.
Currently, the research on laser-welding for AZ system magnesium alloy is more, but swashing for the AZ91 system magnesium alloy of Ultra-fine Grained
Photocoagulation research is seldom.So needing to provide a kind of welding procedure for being suitble to this kind of alloy, to extend the application model of such material
It encloses, there is greatly value.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the blank of the prior art, and it is brilliant to provide a kind of knot AZ91 magnesium alloy ultra-fine
The method of the welding of plate.
The purpose of the present invention is achieved by the following technical programs:
A kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate is provided, comprising the following steps:
S1: the position to be welded both side surface of welded workpiece is polished or is cleaned；
S2: the workpiece to be welded after polishing or cleaning is fixed on welding tool setup；
S3: setting technological parameter: for the CO2 Laser Output Beam mode used for TEM01, optical maser wavelength is 10.6 μm,
Before focusing lasing beam diameter 30~40mm, the CO2 laser depth of focus L used for 0.2~0.5mm and focus diameter d be 0.8~
1.0mm；Welding current is 5~7A, and speed of welding is 1~8m/min.
Further, the welded workpiece is cleaned by chemical method, first by welding workpiece concentration be 2.5~
In 3.0wt% dilute nitric acid solution stand 30~45S, place into concentration be 3~4.5wt% sodium hydroxide solution in stand 20~
25S；It is washed with deionized water surface again, and dries.
Further, the gas shield of the welding is mixed using CO2, N2 and He, and the volume ratio of three is 1:5~8:15
~18.
Further, the flow of the gas shield is 8~12L/min.
It is further preferred that 5.5~6.5A of the welding current, the speed of welding is 5~8m/min.
Compared with prior art, the invention has the following advantages:
The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate of the invention is by research welding procedure to welding pool
Effect, influence of the welding procedure to welded blank mechanical property, welding procedure are basic herein to the affecting laws of weld crack
On, the relation curve between these parameters is established, has obtained the best welding of the laser welding of AZ91 magnesium alloy ultra-fine crystalline substance plate
Technique.
The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate of the invention is not necessarily to special device or equipment, at low cost, leads to
The size relationship between research speed of welding, welding current and fusion penetration is crossed, AZ91 magnesium alloy ultra-fine crystalline substance plate is avoided and often goes out
Phenomena such as existing weld crack, undercut, stomata, pit and not weld penetration.
Specific embodiment
Below with reference to present invention be described in more detail with specific embodiment.Unless stated otherwise, the embodiment of the present invention makes
Various raw materials can be obtained by regular market purchase, or be prepared according to the conventional method of this field, and device therefor is
Test commonly used equipment.Unless otherwise defined or described herein, all professional and scientific terms and art technology used herein
Meaning known to skilled person is identical.
Embodiment 1
The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate disclosed in the present embodiment, comprising the following steps:
S1: the position to be welded both side surface of welded workpiece is polished or is cleaned, welded workpiece passes through chemistry
Method is cleaned, and is first to stand 30~45S in 2.5~3.0wt% dilute nitric acid solution in concentration by welding workpiece, is placed into concentration
To stand 20~25S in the sodium hydroxide solution of 3~4.5wt%；It is washed with deionized water surface again, and dries.
S2: the workpiece to be welded after polishing or cleaning is fixed on welding tool setup；
S3: setting technological parameter: for the CO2 Laser Output Beam mode used for TEM01, optical maser wavelength is 10.6 μm,
Before focusing lasing beam diameter 30~40mm, the CO2 laser depth of focus L used for 0.2~0.5mm and focus diameter d be 0.8~
1.0mm；Welding current is 5~7A, and speed of welding is 1~8m/min.
Wherein, the gas shield of welding is mixed using CO2, N2 and He, and the volume ratio of three is 1:5~8:15~18；Gas
The flow of body protection is 8~12L/min.
In the welding carried out by the above method, the relation curve between speed of welding, laser current and molten wide has been obtained
Table 1.Seen by table 1, with the increase of speed of welding, under the width in molten bath gradually subtracts, the amplitude of reduction is also fewer and fewer, works as welding
When speed V=4m/min, the variation of weld width is very gentle, tends towards stability, and the width of weld seam is also controlled in 2mm
Within.Therefore, consider from the width of welding pool, the selection of speed of welding is because this is V >=4m/min proper, the speed model
The pool width size enclosed is suitable, and also becomes and stablize.
Table 1
In conjunction with the actual conditions of laser current, from the point of view of welding molten wide, following welding parameters be can satisfy
Requirement: when welding current I=5A, V=1-8m/min；When I=5.5A, V=3-8m/min；When I=6A, V=3-8m/
min；When I=6.5A, V=3-8m/min；When I=7A, V=5-8m/min can meet the requirement of pool width.
Size relationship of the table 2 between speed of welding, welding current and fusion penetration can clearly learn the depth of welding pool
Degree, to primarily determine that welding condition lays the foundation.The magnesium alloy plate of this research is with a thickness of 2mm, so pool depth
Parameter lower than 2mm thickness excludes first.As laser current I=5A, only V=1m/min's can satisfy fusion penetration, and this is joined
Weld seam under several occurs burning phenomenon, so the laser current I > 5A of this experiment.However as I >=6.5A, the depth in molten bath
Generally all it is higher than 3mm, range required for us is had exceeded, so the laser current of this experiment must also I < 6.5A.Therefore,
It is selected from the depth in molten bath, as laser current I=5.5A, V=4-5m/min；As laser current I=6A, V=7-8m/
min；As laser current I=6.5A, V=8m/min can satisfy requirement.
Table 2
Size relationship between 3 speed of welding of table, welding current and depth-to-width ratio, as laser current I=5 and I=5.5,
Depth-to-width ratio is in downward trend, has reacted laser welding by deep penetration welding and has switched to heat transfer welding；As laser current I >=5.5, surveying
Within the scope of fixed speed of welding, depth-to-width ratio presents raw trend.Therefore, consider from the depth-to-width ratio of welding, welding parameter below
It can satisfy requirement: laser current I=5A, v=1-2m/min；Laser current I=5.5A, v=1-7m/min；Laser current I
=6A, v=1-8m/min；Laser current I=6.5A, v=1-8m/min；Laser current I=7A, v=1-8m/min.
Table 3
In conclusion from pool width, pool depth and fusion penetration than considering, when the AZ91 system magnesium alloy of welding 2mm thickness, choosing
It is proper with following parameters: I=5.5A, V=5-6m/min；I=6A, V=6-7m/min；I=6.5A, V=7m/min；
I=7A, V=8m/min.
The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate of the invention is by research welding procedure to welding pool
Effect, influence of the welding procedure to welded blank mechanical property, welding procedure are basic herein to the affecting laws of weld crack
On, the relation curve between these parameters is established, has obtained the best welding of the laser welding of AZ91 magnesium alloy ultra-fine crystalline substance plate
Technique.
The method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate of the invention is not necessarily to special device or equipment, at low cost, leads to
The size relationship between research speed of welding, welding current and fusion penetration is crossed, AZ91 magnesium alloy ultra-fine crystalline substance plate is avoided and often goes out
Phenomena such as existing weld crack, undercut, stomata, pit and not weld penetration.
Inventor's statement, detailed process equipment and process flow of the invention that the present invention is explained by the above embodiments,
But the present invention is not limited to the above detailed process equipment and process flow, that is, it is above-mentioned detailed not mean that the present invention must rely on
Process equipment and process flow could be implemented.It should be clear to those skilled in the art, any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within of the invention
Within protection scope and the open scope.
Claims (5)
1. a kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate, which comprises the following steps:
S1: the position to be welded both side surface of welded workpiece is polished or is cleaned；
S2: the workpiece to be welded after polishing or cleaning is fixed on welding tool setup；
S3: setting technological parameter: for the CO2 Laser Output Beam mode used for TEM01, optical maser wavelength is 10.6 μm, is focused
Preceding 30~40mm of lasing beam diameter, the CO2 laser depth of focus L used are 0.8~1.0mm for 0.2~0.5mm and focus diameter d；Weldering
Connecing electric current is 5~7A, and speed of welding is 1~8m/min.
2. the method for the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate according to claim 1, which is characterized in that described to be welded
Workpiece is cleaned by chemical method, first by welding workpiece concentration be 2.5~3.0wt% dilute nitric acid solution in stand 30~
45S is placed into the sodium hydroxide solution that concentration is 3~4.5wt% and is stood 20~25S；It is washed with deionized water surface again, and
It dries.
3. the method for the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate according to claim 1, which is characterized in that the welding
Gas shield is mixed using CO2, N2 and He, and the volume ratio of three is 1:5~8:15~18.
4. the method for the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate according to claim 3, which is characterized in that the gas is protected
The flow of shield is 8~12L/min.
5. the method for the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate according to claim 1, which is characterized in that the welding electricity
5.5~6.5A of stream, the speed of welding are 5~8m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910192672.XA CN109759703A (en) | 2019-03-14 | 2019-03-14 | A kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910192672.XA CN109759703A (en) | 2019-03-14 | 2019-03-14 | A kind of method of the welding of AZ91 magnesium alloy ultra-fine crystalline substance plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500271A (en) * | 2021-05-27 | 2021-10-15 | 卡斯马汽车系统（重庆）有限公司 | Method for obtaining welding parameters of aluminum alloy MIG welding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101502918A (en) * | 2009-01-16 | 2009-08-12 | 北京工业大学 | Method for reducing laser welding pores of cast magnesium alloy |
| CN205237329U (en) * | 2015-12-31 | 2016-05-18 | 湖南汽车工程职业学院 | Welding set is filled to magnesium alloy CO2 laser |
| CN105880852A (en) * | 2016-05-28 | 2016-08-24 | 长春理工大学 | Ultrasonically assisted pulse laser-MIG composite heat source welding device and welding method thereof |
| JP2017131918A (en) * | 2016-01-27 | 2017-08-03 | 株式会社総合車両製作所 | Laser welding method |
-
2019
- 2019-03-14 CN CN201910192672.XA patent/CN109759703A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101502918A (en) * | 2009-01-16 | 2009-08-12 | 北京工业大学 | Method for reducing laser welding pores of cast magnesium alloy |
| CN205237329U (en) * | 2015-12-31 | 2016-05-18 | 湖南汽车工程职业学院 | Welding set is filled to magnesium alloy CO2 laser |
| JP2017131918A (en) * | 2016-01-27 | 2017-08-03 | 株式会社総合車両製作所 | Laser welding method |
| CN105880852A (en) * | 2016-05-28 | 2016-08-24 | 长春理工大学 | Ultrasonically assisted pulse laser-MIG composite heat source welding device and welding method thereof |
Non-Patent Citations (3)
| Title |
|---|
| SHEN YAN-JIN: "Welded Joint Model Construction and Welding Mechanism of AZ91 Magnesium Alloy", 《JOURNAL OF DONGHUA UNIVERSITY》 * |
| 杨自美: "高热裂倾向镁合金细晶薄板的激光焊接行为及液化机理的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
| 陈小玲: "细晶粒AZ系镁合金板材激光焊接接头微观组织及热裂行为研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113500271A (en) * | 2021-05-27 | 2021-10-15 | 卡斯马汽车系统（重庆）有限公司 | Method for obtaining welding parameters of aluminum alloy MIG welding |
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