CN108161263A - A kind of argon-arc welding-braze welding composite welding method - Google Patents
A kind of argon-arc welding-braze welding composite welding method Download PDFInfo
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- CN108161263A CN108161263A CN201810157189.3A CN201810157189A CN108161263A CN 108161263 A CN108161263 A CN 108161263A CN 201810157189 A CN201810157189 A CN 201810157189A CN 108161263 A CN108161263 A CN 108161263A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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Abstract
The present invention provides a kind of argon arc weldings to be brazed complex welding method, this method realizes that magnesium alloy treats the welding of welding plate and copper plate using Mg Nb middle layers, having obstructed two kinds of base materials, directly the caused connector internal stress of welding is larger, causes deformation, and the two is in direct contact and easily forms intermediate compound, influence the intensity of welding point, unfavorable, the excellent combination property of the weldment of acquisition of toughness；And the present invention the defects of overcoming individually using argon arc welding or soldering, has very good effect, industrial application value is wide using argon arc welding and soldering composite welding mode.
Description
Technical field
The invention belongs to welding technology fields, and in particular to a kind of argon-arc welding-braze welding composite welding method.
Background technology
Material is that the mankind depend on for existence and development, conquer nature and the material base of nature remodeling and human society hair
The development of the guide of exhibition, particularly Modern High-Tech, even more dependent on the progress of new material technology.The research and development of new material structures are
The mainstay of industrial technology level is improved, if without the development of modern hyperstructure material, does not just have world today's aviation
The progress of aerospace industry.And nonferrous materials is most important a kind of material, such as magnesium and aluminium.The wherein rich reserves of magnesium,
Compared with other common metals, magnesium has many advantages, such as low-density, high specific strength and can be recycled, and becomes coke of concern
Point is known as " 21 century novel environmentally protective engineering material ".
Although magnesium is found have two century-old history, until in the 1990s, in auto industry it is energy saving and
Development trend that is quick, growing steadily is presented in the needs of environmental protection, the demand to magnesium and magnesium alloy.And as prepared by magnesium alloy plus
The breakthrough of work forming technique etc., be suitble to different requirements novel magnesium alloy developed, such as high-strength Mg-Al alloys and
Antiflaming magnesium alloy etc.." magnesium alloy is applied and exploitation " is classified as the emphasis of Material Field in national science and technology development plan by China, closely
Over 10 years, the new developmental research level of Mg alloys is significantly improved.At present Mg alloys mainly include Mg-Al-Zn systems,
Mg-Al-Mn systems, Mg-Al-Si systems and Mg-Al-Re systems etc.；But in order to meet each mechanical industry department to Mg alloy structure performances
Requirement, some novel Mg alloys are developed, such as the wrought magnesium alloy applied to electronic communication product, ultralight, high
By force, anti-corrosion Mg-Li alloys and Mg-Re alloys, applied to following aerospace field high temperature Mg alloys Mg-Re-Ca-Zr with
And Mg alloys etc. are coagulated soon.And further improving with Mg alloy preparation techniques, occur Mg alloys flame-retarded technology in succession, Mg is closed
Mg alloys are greatly facilitated in automobile, boat in golden melt environment-friendly type protection technique and Mg alloy Microarc Oxidation Surface Treatment technologies etc.
The application in the fields such as empty space flight.As what magnesium and magnesium alloy were applied in every profession and trade increases rapidly, the connection of magnesium and magnesium alloy is asked
Topic causes the very big concern of people, but since the welding performance of magnesium and magnesium alloy is bad, is difficult to realize reliable connection, therefore magnesium
The connection of alloy and magnesium alloy and other materials structural member becomes the technical bottleneck that restricts magnesium alloy application and anxious to be resolved
Key technology.CN103286402 discloses a kind of gas brazing welding method of magnesium alloy, and solder mixed powder is first made in this method
End, then powder is wrapped up, and solder is made through cold drawing method using magnesium ribbon, the straight of final brazing solder can be adjusted as needed
Diameter and length, whole process does not carry out melt process to raw material, therefore avoids loss of the raw material during ingot casting is melted, and
And without smelting equipment, preparation process is simple.Secondly, which, by many experiments, finally obtains in the selection of material
State optimizing components configuration, wherein Na3AlF6As activator, play a part of to melt magnesia in brazing process.Finally, it is of the invention
To Mg powder, Zn powder and Al powder using ball-milling treatment, further reducing powder size makes its activation, can improve the strong of sintered body
Degree, improves its elongation percentage.
Red copper has high electric conductivity, thermal conductivity and excellent plasticity, and thermal conductivity height makes the worsening condition of local heating,
Heat cannot be concentrated, and scatter and disappear fast, this requirement ensures the preheating of base material before welding.Copper also belongs to the higher gold of coefficient of thermal expansion
Belong to, 1.5 times higher than mild steel, when welding can generate big deformation or increase welding stress causes crackle.In addition, copper liquid mobility
Good, force difference of adhering, when welding, is difficult to control.When temperature is at 550 DEG C or so, the mechanical performance of red copper is remarkably decreased, this is also
A reason of defect is generated during welding.In addition, in the welding of red copper, weld seam and fusion area are also easy to produce stomata, main former
Because the reaction with hydrogen and oxygen in the decline of the solubility of hydrogen and metallurgical process is related.
In the welding process of magnesium alloy and red copper, on the one hand since the two linear expansion coefficient, thermal conductivity difference are larger, welding
It connects and difference is deformed in heating and cooling procedure, connector is caused to form larger internal stress；On the other hand, the two is in direct contact easy formation
Intermediate compound influences intensity, the toughness of welding point, so as to influence the quality of entire weldment.
Invention content
The technical problems to be solved by the invention are to provide a kind of argon-arc welding-braze welding composite welding method, and this method can
The defects of welding point integrated quality is poor in the welding process of magnesium alloy and red copper is solved well.
To solve the above problems, the technical solution adopted by the present invention is：
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 15-25V, welding process carry out under the argon gas protection that purity is 99.9%；Later to connecing
Head is quenched, and quenched welding point is put into cryogenic treatment apparatus, will with the rate of temperature fall of 5 DEG C~10 DEG C/min
Temperature in cryogenic treatment apparatus drops to -160 DEG C~-220 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, in sky
Reach 25 DEG C in gas；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.1-0.4mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, be covered above brazed seam and solder
Brazing flux；Base material is preheating to 450-550 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, molten
Melt under brazing flux protection, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder exists
Gravity and the lower filling base material gap of capillary force effect are stopped electric arc heated, were prevented in cooling procedure with flame gun baking base material
Fast cooling, brazed seam is formed after cooling.
Wherein, the Mg-Nb middle layers are by Mg, Nb and Zn, Zr 1-2 in mass ratio：1-2：0.05-0.1:0.05-0.1
Alloy sheets obtained from carrying out high melt.
Preferably, the Mg-Nb middle layers are by Mg, Nb and Zn, Zr in mass ratio 2： 2： 0.1:0.1 carries out high temperature
Alloy sheets obtained from melting.
The ingredient of the magnesium alloy solder wire is identical with the ingredient that magnesium alloy treats welding plate, a diameter of 2-4mm.
The step（2）The linear velocity 100-200cm/min of middle welding, argon flow amount 50-150L/min, torch nozzle from
The distance 5-l5mm of welding point.
The step（3）Middle solder is copper manganese silver solder.
Preferably, the ingredient of the copper manganese silver solder is：Copper content 30-45wt%, manganese content 15-35wt%, surplus are
Silver.
Compared with prior art, the beneficial effects of the present invention are：
（1）The invention realizes that magnesium alloy treats the welding of welding plate and copper plate using Mg-Nb middle layers, has obstructed two
The caused connector internal stress of the direct welding of kind base material is larger, deformation and the two is caused to be in direct contact the intermediate chemical combination of easy formation
Object influences the intensity of welding point, unfavorable, the excellent combination property of the weldment of acquisition of toughness；
（2）Mg middle layers and magnesium alloy are in joint shape when the Mg-Nb middle layers of the present invention avoid exclusive use Mg middle layers
Into brittle metallic compound, so as to reduce performance；Or Nb forms intermetallic compound with red copper when Nb middle layers are used alone
And joint performance is influenced, Nb alloy of the Mg-Nb middle layers due to foring Mg overcomes the above problem well；
（3）The present invention is using argon arc welding and soldering composite welding mode, the defects of overcoming individually using argon arc welding or soldering, tool
There is very good effect, industrial application value is wide.
Specific embodiment
Technical scheme of the present invention is further elaborated with reference to embodiment：
Embodiment 1
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 20V, welding process carry out under the argon gas protection that purity is 99.9%；Later Welded Joints into
Row quenching, quenched welding point is put into cryogenic treatment apparatus, is filled subzero treatment with the rate of temperature fall of 8 DEG C/min
Temperature in putting drops to -180 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, reach 25 DEG C in air；Wherein,
The linear velocity 150cm/min of welding, argon flow amount 100L/min, torch nozzle is from welding point distance 10mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.3mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；
Base material is preheating to 500 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, is protected in melting brazing flux
Under shield, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and hair
The carefully lower filling base material gap of power effect, stops electric arc heated, and toasting base material in cooling procedure with flame gun prevents too fast cooling, cold
But brazed seam is formed afterwards；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 35wt%, manganese
Content 35wt%, surplus are silver.
Embodiment 2
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 25V, welding process carry out under the argon gas protection that purity is 99.9%；Later Welded Joints into
Row quenching, quenched welding point is put into cryogenic treatment apparatus, with the rate of temperature fall of 10 DEG C/min by subzero treatment
Temperature in device drops to -200 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, reach 25 DEG C in air；Its
In, the linear velocity 160cm/min of welding, argon flow amount 120L/min, torch nozzle is from welding point distance 10mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.3mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；
Base material is preheating to 500 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, is protected in melting brazing flux
Under shield, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and hair
The carefully lower filling base material gap of power effect, stops electric arc heated, and toasting base material in cooling procedure with flame gun prevents too fast cooling, cold
But brazed seam is formed afterwards；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 45wt%, manganese
Content 30wt%, surplus are silver.
Embodiment 3
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 20V, welding process carry out under the argon gas protection that purity is 99.9%；Later Welded Joints into
Row quenching, quenched welding point is put into cryogenic treatment apparatus, is filled subzero treatment with the rate of temperature fall of 6 DEG C/min
Temperature in putting drops to -170 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, reach 25 DEG C in air；Wherein,
The linear velocity 120cm/min of welding, argon flow amount 80L/min, torch nozzle is from welding point distance 9mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.2mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；
Base material is preheating to 480 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, is protected in melting brazing flux
Under shield, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and hair
The carefully lower filling base material gap of power effect, stops electric arc heated, and toasting base material in cooling procedure with flame gun prevents too fast cooling, cold
But brazed seam is formed afterwards；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 40wt%, manganese
Content 25wt%, surplus are silver.
Embodiment 4
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 15V, welding process carry out under the argon gas protection that purity is 99.9%；Later Welded Joints into
Row quenching, quenched welding point is put into cryogenic treatment apparatus, is filled subzero treatment with the rate of temperature fall of 5 DEG C/min
Temperature in putting drops to -160 DEG C DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, reach 25 DEG C in air；Its
In, the linear velocity 100cm/min of welding, argon flow amount 50L/min, torch nozzle is from welding point distance 5mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.1mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；
Base material is preheating to 450 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, is protected in melting brazing flux
Under shield, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and hair
The carefully lower filling base material gap of power effect, stops electric arc heated, and toasting base material in cooling procedure with flame gun prevents too fast cooling, cold
But brazed seam is formed afterwards；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 45wt%, manganese
Content 25wt%, surplus are silver.
Embodiment 5
A kind of argon-arc welding-braze welding composite welding method, the composite welding be by magnesium alloy treat welding plate by Mg-Nb middle layers with
Copper plate is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 25V, welding process carry out under the argon gas protection that purity is 99.9%；Later Welded Joints into
Row quenching, quenched welding point is put into cryogenic treatment apparatus, with the rate of temperature fall of 10 DEG C/min by subzero treatment
Temperature in device drops to -220 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, reach 25 DEG C in air；Its
In, the linear velocity 200cm/min of welding, argon flow amount 150L/min, torch nozzle is from welding point distance l5mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.4mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；
Base material is preheating to 550 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, is protected in melting brazing flux
Under shield, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and hair
The carefully lower filling base material gap of power effect, stops electric arc heated, and toasting base material in cooling procedure with flame gun prevents too fast cooling, cold
But brazed seam is formed afterwards；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 40wt%, manganese
Content 25wt%, surplus are silver.
Comparative example 1
A kind of argon-arc welding-braze welding composite welding method, the composite welding are that magnesium alloy being treated, welding plate passes through Mg middle layers and purple
Copper coin is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Mg middle layers carry out argon to magnesium alloy with magnesium alloy solder wire
Arc welding, weldingvoltage 20V, welding process carry out under the argon gas protection that purity is 99.9%；Welded Joints carry out later
Quenching, quenched welding point is put into cryogenic treatment apparatus, with the rate of temperature fall of 8 DEG C/min by cryogenic treatment apparatus
In temperature drop to -180 DEG C from room temperature, keep the temperature 6 hours, finally weldment taken out, reaches 25 DEG C in air；Wherein, it welds
The linear velocity 150cm/min connect, argon flow amount 100L/min, torch nozzle is from welding point distance 10mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Mg middle layers are docked with copper plate, joint gap width
0.3mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；It uses
Base material is preheating to 500 DEG C by flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, under melting brazing flux protection,
Its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and capillary masterpiece
With lower filling base material gap, stop electric arc heated, toasting base material in cooling procedure with flame gun prevents too fast cooling, shape after cooling
Into brazed seam；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 35wt%, manganese content
35wt%, surplus are silver.
Comparative example 2
A kind of argon-arc welding-braze welding composite welding method, the composite welding are that magnesium alloy being treated, welding plate passes through Nb middle layers and purple
Copper coin is welded, and is as follows：
（1）The magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
（2）Spot welding positioning is first carried out on platform position, then treats that welding plate and Nb middle layers carry out argon to magnesium alloy with magnesium alloy solder wire
Arc welding, weldingvoltage 20V, welding process carry out under the argon gas protection that purity is 99.9%；Welded Joints carry out later
Quenching, quenched welding point is put into cryogenic treatment apparatus, with the rate of temperature fall of 8 DEG C/min by cryogenic treatment apparatus
In temperature drop to -180 DEG C from room temperature, keep the temperature 6 hours, finally weldment taken out, reaches 25 DEG C in air；Wherein, it welds
The linear velocity 150cm/min connect, argon flow amount 100L/min, torch nozzle is from welding point distance 10mm；
（3）By step（2）The magnesium alloy of argon arc welding treats that welding plate and Nb middle layers are docked with copper plate, joint gap width
0.3mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, and brazing flux is covered above brazed seam and solder；It uses
Base material is preheating to 500 DEG C by flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, under melting brazing flux protection,
Its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder is in gravity and capillary masterpiece
With lower filling base material gap, stop electric arc heated, toasting base material in cooling procedure with flame gun prevents too fast cooling, shape after cooling
Into brazed seam；Solder is copper manganese silver solder in the step, and the ingredient of the copper manganese silver solder is：Copper content 35wt%, manganese content
35wt%, surplus are silver.
Finally shear strength test and tensile strength is carried out to soldered fitting to test, shearing strength of joint test method according to
GB11363.89 (soldering joint strength test method) is carried out, and the test specimen of postwelding measures on MTS810 testing machine for mechanical properties to be connect
The shearing strength of head.During test, the fixture movement speed 0.5mm/s of clamping, 5.0 points of data transfer rate, the second, 18 DEG C of temperature, record connects
The load applied during head rupture.
Joint tensile strength test method is that prepared soldered fitting is cut into GB11363-89 (solderings using wire cutting
Strength of joint test method) as defined in tensile sample size, make weld seam placed in the middle, and polished cut surface with sand paper.Tension test
It is carried out on MTS810 testing machine for mechanical properties, the fixture movement speed 0.5mm/s of clamping, the 5.0 points/second of data transfer rate, temperature 18
DEG C, record the load applied during joint breaking.
Experimental result such as following table：
| Shear strength（Mpa） | Tensile strength（Mpa） | |
| Embodiment 1 | 145.9 | 151.7 |
| Embodiment 2 | 147.6 | 157.2 |
| Embodiment 3 | 142.2 | 155.4 |
| Embodiment 4 | 139.3 | 149.8 |
| Embodiment 5 | 145.2 | 156.3 |
| Embodiment 6 | 137.8 | 145.7 |
| Comparative example 1 | 82.3 | 88.5 |
| Comparative example 2 | 93.1 | 97.1 |
Above-mentioned experimental data is compared, connector has excellent performance when finding embodiment 1-6 using Mg-Nb as middle layer.
A kind of argon-arc welding-braze welding composite welding method provided above the invention implementation has carried out detailed Jie
It continues, for those of ordinary skill in the art, the thought of embodiment is created according to the present invention, in specific embodiment and using model
There will be changes are placed, in conclusion the content of the present specification should not be construed as the limitation to the invention.
Claims (7)
1. a kind of argon-arc welding-braze welding composite welding method, which is characterized in that the composite welding is that magnesium alloy being treated, welding plate passes through
Mg-Nb middle layers are welded with copper plate, are as follows：
(1) magnesium alloy of reticular structure is taken to treat welding plate, the greasy dirt of plate surface to be welded is first removed with acetone, is then beaten with sand paper machinery
Mill treats welding plate, its both sides is made to expose metallic luster；
(2) spot welding positioning is first carried out on platform position, then treats that welding plate and Mg-Nb middle layers are carried out to magnesium alloy with magnesium alloy solder wire
Argon arc welding, weldingvoltage 15-25V, welding process carry out under the argon gas protection that purity is 99.9%；Later to connecing
Head is quenched, and quenched welding point is put into cryogenic treatment apparatus, will with the rate of temperature fall of 5 DEG C~10 DEG C/min
Temperature in cryogenic treatment apparatus drops to -160 DEG C~-220 DEG C from room temperature, keeps the temperature 6 hours, finally takes out weldment, in sky
Reach 25 DEG C in gas；
(3) magnesium alloy of step (2) argon arc welding is treated that welding plate and Mg-Nb middle layers are docked with copper plate, joint gap
Width 0.1-0.4mm, the preseting solder above brazed seam, solder used in amounts ensure to fill up gap, be covered above brazed seam and solder
Brazing flux；Base material is preheating to 450-550 DEG C using flame gun, melts brazing flux by heat transfer, after brazing flux is completely melt, molten
Melt under brazing flux protection, its fusing is made by the quick heating solder of electric arc electric discharge using tungsten argon arc welding gun so that liquid solder exists
Gravity and the lower filling base material gap of capillary force effect are stopped electric arc heated, were prevented in cooling procedure with flame gun baking base material
Fast cooling, brazed seam is formed after cooling.
2. welding method according to claim 1, which is characterized in that the Mg-Nb middle layers are by Mg, Nb and Zn, Zr
1-2 in mass ratio：1-2：0.05-0.1:0.05-0.1 carries out alloy sheets obtained from high melt.
3. welding method according to claim 2, which is characterized in that the Mg-Nb middle layers are by Mg, Nb and Zn, Zr
In mass ratio 2：2：0.1:0.1 carries out alloy sheets obtained from high melt.
4. welding method according to claim 1, which is characterized in that the ingredient of the magnesium alloy solder wire and magnesium alloy are to be welded
The ingredient of plate is identical, a diameter of 2-4mm.
5. according to claim 1-4 any one of them welding methods, which is characterized in that the linear speed welded in the step (2)
100-200cm/min is spent, argon flow amount 50-150L/min, torch nozzle is from welding point distance 5-l5mm.
6. according to claim 1-5 any one of them welding methods, which is characterized in that solder is copper manganese in the step (3)
Silver solder.
7. welding method according to claim 6, which is characterized in that the ingredient of the copper manganese silver solder is：Copper content 30-
45wt%, manganese content 15-35wt%, surplus are silver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810157189.3A CN108161263B (en) | 2018-02-24 | 2018-02-24 | Argon arc welding-brazing composite welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810157189.3A CN108161263B (en) | 2018-02-24 | 2018-02-24 | Argon arc welding-brazing composite welding method |
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