CN108237284A - A kind of welding method of silver molybdenum electrode - Google Patents
A kind of welding method of silver molybdenum electrode Download PDFInfo
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- CN108237284A CN108237284A CN201611206048.3A CN201611206048A CN108237284A CN 108237284 A CN108237284 A CN 108237284A CN 201611206048 A CN201611206048 A CN 201611206048A CN 108237284 A CN108237284 A CN 108237284A
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- solder
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- molybdenum
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/002—Soldering by means of induction heating
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The present invention is a kind of welding method of silver-colored molybdenum electrode, and the made silver-colored molybdenum head of silver-colored molybdenum material and the copper seat of fine copper or copper alloy are welded as silver-colored molybdenum electrode, and step is：Clear up surface to be welded；Surface to be welded docks after smearing brazing mixture, clamping, and surface to be welded is level；The peripheral welds of surface to be welded smear stop-off gent and weld seam are divided into the exhaust area for accounting for 25%~40% and the solder addition area for accounting for 15%~30%；It is opposite with the position while welding of exhaust area that solder adds in area；Part to be welded is packed into HF induction heating apparatus with fixture, and appropriate solder is placed in solder and adds in area, quickly heats up to brazing filler metal melts, adjusts sensing electric current heat preservation, until the solder melted occurs in exhaust area, shuts down heating equipment, cool down to obtain silver-colored molybdenum electrode.This method stop-off gent inhibits fusing solder to be flowed in peripheral welds, and fusing solder adds in area and flow into from exhaust area from solder to flow out, and the gas in gap is squeezed out, and solves the problems, such as that gas is discharged in big specification silver molybdenum electrode holding time gap；Ratio of brazing area significantly improves, up to more than 80%.
Description
Technical field
The invention belongs to welding technology fields, and in particular to a kind of welding method of silver molybdenum electrode.
Background technology
Silver-colored molybdenum material has good resistance to arc erosion and electrical and thermal conductivity performance, is widely used in electric switch and electricity
On extremely.Silver-colored molybdenum material is usually prepared with powder metallurgical technique, and complex process, cost is higher, but as long as there is certain thickness can
Meet the requirements such as high temperature resistant, wear-resistant and resistance to arc erosion during use.
Copper or copper alloy cost are lower than silver-colored molybdenum material, and with the good conductive, capacity of heat transmission, can guarantee the electric current of electrode
Conducting, heat transfer and heat dissipation.
Sheet is made in silver-colored molybdenum material when therefore preparing electrode or copper seat is made in block-like silver-colored molybdenum head, copper or copper alloy, silver
It is silver-colored molybdenum electrode that molybdenum head, which is welded on copper seat, and copper seat is the support construction of silver-colored molybdenum head, is additionally operable to the company of electrode and other component
It connects.
The welding of silver-colored molybdenum electrode is the welding of silver-colored molybdenum head and copper seat, and one of the most commonly used welding method is soldering.
Conventional soldering processes are that solder is previously positioned between silver-colored molybdenum head and the surface to be welded docked of copper seat or is placed
On the weld seam of surface to be welded perimeter, it is heated up to higher than solder fusing point, brazing filler metal melts are inhaled into and fill out under capillarity
Fill the gap of silver-colored molybdenum head and copper seat surface to be welded.Different welding conditions and welding procedure, the ability in solder filling gap is different, weldering
The ratio of brazing area connect is also different, and ratio of brazing area is bigger, and weld strength is higher, and welding quality is better.
When big specification silver molybdenum electrode is brazed, the plane to be welded of the two is opposite to be close to and in horizontality, that is, uses
Horizontal clearance.Flow resistance after brazing filler metal melts in gap is larger, and flows what is be subject on the weld seam of the periphery of surface to be welded
Resistance is smaller, therefore solder is flowed in surface to be welded peripheral welds than being flowed soon in the gap between surface to be welded.When the pricker of fusing
When material fills up surface to be welded circumferential weld, gap in the middle part of surface to be welded will be closed, gas therein is difficult to discharge, i.e., silver-colored molybdenum head
It cannot be filled with the internal clearance of copper seat surface to be welded by solder, cause ratio of brazing area relatively low, weld strength is unqualified.Silver-colored molybdenum electrode
Size is bigger, and silver-colored molybdenum head and the surface to be welded area that copper seat needs weld are bigger, the more difficult discharge of internal gas, ratio of brazing area
It is also more difficult to meet the requirements with weld strength.
The welding requirements weld strength of silver-colored molybdenum electrode is high, and welding ratio of brazing area is required up to more than 70%.But current diameter 35mm
The welding ratio of brazing area of the silver-colored molybdenum electrode of specification is less than 60%.
Invention content
The object of the present invention is to provide a kind of welding method of silver-colored molybdenum electrode, by the outer weld all around of silver-colored molybdenum head and copper seat surface to be welded
Seam is divided into solder and adds in area and exhaust area, makes solder that can only add in area from solder and is flowed to exhaust area, the flowing of solder will be silver-colored
Molybdenum head and the gas of copper seat surface to be welded inner space are squeezed out from exhaust area, are improved ratio of brazing area, are improved weld strength.
The welding method of a kind of silver-colored molybdenum electrode provided by the invention, with argentiferous 25%~60%, containing molybdenum 75%~40%
Silver-colored molybdenum material is made as silver-colored molybdenum head, and the copper alloy of fine copper or more than 80% cupric is made and the matched copper seat of silver-colored molybdenum head, welding master
Want step as follows：
Ith, welding preparation
Silver-colored molybdenum head to be welded and the surface to be welded of copper seat are plane, oxide, greasy dirt on cleaning removal surface to be welded and other
Impurity；
IIth, part to be welded assembles
Silver-colored molybdenum head after step I cleaning and one layer of copper of each uniform smearing or copper alloy brazing mixture on the surface to be welded of copper seat,
Two surfaces to be welded dock, and are clamped on electrode welding fixture special, surface to be welded is horizontality；
IIIth, stop-off gent is smeared
Stop-off gent is smeared on the perimeter weld seam of surface to be welded docked in silver-colored molybdenum head and copper seat, by entire weld seam perimeter point
It is divided into exhaust area and solder adds in area, exhaust section length is the 25%~40% of weld seam overall circumference, and solder adds in section length as weldering
The 15%~30% of overall circumference is stitched, the weld seam that exhaust area and solder are added between area smears stop-off gent.
Solder addition area is opposite with the position of weld seam residing for exhaust area, the line at the two center and the geometric center of surface to be welded
Distance be less than the 1/2 of the geometric center and periphery minimum range.Preferred plan is that solder adds in district center and exhaust district center
Line pass through surface to be welded geometric center.
The stop-off gent is mixed by metal oxide and bonding agent, the metal oxide for aluminium oxide, zirconium oxide,
The weight ratio of any one of titanium oxide and magnesia, oxide and bonding agent is 10:(1~3).The bonding agent is polyethylene
Any one of alcohol bonding agent, polyethylene glycol bonding agent and acrylate copolymer bonding agent.
For ease of the smearing of stop-off gent, carried out after the docking of the surface to be welded of step II silver molybdenum head and copper seat this step or
This step is carried out after silver-colored molybdenum head and copper seat clamping.
IVth, it is brazed
It will complete to be fitted into HF induction heating apparatus together with step III treated part to be welded and fixture, by suitable pricker
Material is placed in solder and adds in area, starts HF induction heating apparatus and quickly heats, and when observing that solder starts fusing, adjusts induced electricity
Stream is kept the temperature；Observation solder adds in the gap that fusing solder in area is inhaled into the part to be welded of docking, is added in when needing in solder
Area supplements solder, until observing that the solder melted occurs in exhaust area, i.e. the gap of part to be welded is full of by solder, shuts down high frequency
Induction heating equipment, part to be welded are cooled to solder fusing point hereinafter, obtaining silver-colored molybdenum head and the silver that is integrated of copper seat soldering on fixture
Molybdenum electrode.
The solder is selected according to the material of silver-colored molybdenum head and copper seat.
The HF induction heating apparatus is equipped with temperature sensor and temperature real-time displaying device.
Compared with prior art, it is the advantages of a kind of welding method of silver-colored molybdenum electrode of the present invention：1st, it is smeared using stop-off gent
Weld seam is divided into exhaust area and adds in area with solder by peripheral welds, and stop-off gent inhibits the flowing that fusing solder is sewed in outer weld all around,
Fusing solder is forced to add in after area flows into from solder to flow out from exhaust area again, melts in the flowing of solder and squeezes the gas in gap
Go out, its gap internal gas is difficult to when the procedure of processing without increasing equipment or complexity just solves big specification silver molybdenum electrode soldering
The problem of discharge；2nd, significantly improve welding ratio of brazing area, when being brazed using the present invention program ratio of brazing area up to more than 80%,
It ensure that the weld strength of silver-colored molybdenum electrode is qualified.
Specific embodiment
Embodiment 1
Ith, welding preparation
The silver-colored Mo wafer that a diameter of Ф 30mm thickness is 6mm is silver-colored molybdenum head, and a diameter of Ф 33mm length is the fine copper of 30mm
Stick is copper seat, and the surface to be welded of silver-colored molybdenum head is the disk of Ф 30mm, and the surface to be welded of copper seat is the disk of Ф 33mm；Cleaning removal
Oxide, greasy dirt and other impurity on surface to be welded；
IIth, part to be welded assembles
Silver-colored molybdenum head after step I cleaning and one layer of copper of each uniform smearing or copper alloy brazing mixture on the surface to be welded of copper seat,
This example selects paste silver brazing flux, and the docking of two surfaces to be welded is clamped on electrode welding fixture special, and surface to be welded is horizontal
State；
IIIth, stop-off gent is smeared
Stop-off gent is smeared on the outer circular joint of surface to be welded docked in silver-colored molybdenum head and copper seat, entire outer circular joint is divided into
Exhaust area and solder add in area, and this example solder adds in 22% that section length is outer circular joint perimeter, and exhaust section length is welded for outer circle
The 32% of perimeter is stitched, the line of two district centers passes through the center of circle of surface to be welded；It is respectively outer to smear fusion length at the two of stop-off gent
The 23% of circular joint perimeter
This example stop-off gent is mixed for zirconium oxide with polyvinyl alcohol bonding agent, and the weight ratio of oxide and bonding agent is
10:1。
IVth, it is brazed
It will complete to be packed into the induction coil of HF induction heating apparatus together with step III treated part to be welded and fixture.
This example selects (Ag56CuZnSn) brazing wire that melting range is 620 DEG C~655 DEG C, and a diameter of 1mm of solder wire places solder wire
In solder charging zone.Starting HF induction heating apparatus, sensing electric current is adjusted to 500A and is heated, after heating 2 minutes, solder wire
Start to melt；Sensing electric current is adjusted to 200A to keep the temperature, the solder melted after about 1 minute is full of exhaust area weld seam, shuts down height
Frequency induction heating equipment, part to be welded are cooled on fixture below solder fusing point.Gained silver molybdenum electrode welding surface is detected,
It welds ratio of brazing area up to 85%.
This example HF induction heating apparatus is further provided with temperature sensor and temperature real-time displaying device.It is grasped with observation high
The temperature of part to be welded in frequency induction heating equipment.
Embodiment 2
Step I welding preparation is assembled with step II part to be welded, same as Example 1；
IIIth, stop-off gent is smeared
It is similar to Example 1；This example solder adds in 30% that section length is outer circular joint perimeter, and exhaust section length is outer circle
The 40% of weld seam perimeter, the line of two district centers pass through the center of circle of surface to be welded；Smearing fusion length at the two of stop-off gent is respectively
The 15% of outer circular joint perimeter
This example stop-off gent is mixed for zirconium oxide with polyethylene glycol bonding agent, and the weight ratio of oxide and bonding agent is
10:3。
IVth, it is brazed
It will complete to be packed into the induction coil of HF induction heating apparatus together with step III treated part to be welded and fixture.
This example solder is same as Example 1.
Start HF induction heating apparatus, sensing electric current is adjusted to 500A and is heated, and after heating 2 minutes, solder wire starts
Fusing；Sensing electric current is adjusted to 200A to keep the temperature, the solder melted after about 1 minute is full of exhaust area weld seam, shuts down high frequency sense
Heating equipment is answered, part to be welded is cooled on fixture below solder fusing point.Gained silver molybdenum electrode welding surface is detected, is welded
Ratio of brazing area is connect up to 85%.
Embodiment 3：
Step I welding preparation is assembled with step II part to be welded, same as Example 1；
IIIth, stop-off gent is smeared
It is similar to Example 1；This example solder adds in 15% that section length is outer circular joint perimeter, and exhaust section length is outer circle
The 25% of weld seam perimeter, the line of two district centers pass through the center of circle of surface to be welded；Smearing fusion length at the two of stop-off gent is respectively
The 30% of outer circular joint perimeter
This example stop-off gent is mixed for titanium oxide with acrylate copolymer bonding agent, the weight ratio of oxide and bonding agent
It is 10:2.
IVth, it is brazed
It will complete to be packed into the induction coil of HF induction heating apparatus together with step III treated part to be welded and fixture.
This example solder is same as Example 1.
Start HF induction heating apparatus, sensing electric current is adjusted to 500A and is heated, and after heating 2 minutes, solder wire starts
Fusing；Sensing electric current is adjusted to 200A to keep the temperature, the solder melted after about 1 minute is full of exhaust area weld seam, shuts down high frequency sense
Heating equipment is answered, part to be welded is cooled on fixture below solder fusing point.Gained silver molybdenum electrode welding surface is detected, is welded
Ratio of brazing area is connect up to 82%.
Embodiment 4：
Ith, welding preparation
The silver-colored Mo wafer that a diameter of Ф 40mm thickness is 10mm is silver-colored molybdenum head, and a diameter of Ф 43mm length is 50mm's
QCr0.5 chromium-coppers stick is copper seat, and the surface to be welded of silver-colored molybdenum head is the disk of Ф 40mm, and the circle that the surface to be welded of copper seat is Ф 43mm is put down
Face；Oxide, greasy dirt and other impurity on cleaning removal surface to be welded；
IIth, part to be welded assembles
It is same as Example 1；
IIIth, stop-off gent is smeared
This example stop-off gent is mixed for magnesia with polyvinyl alcohol bonding agent, and the weight ratio of oxide and bonding agent is
10:1。
It is other same as Example 1；
IVth, it is brazed
It will complete to be packed into the induction coil of HF induction heating apparatus together with step III treated part to be welded and fixture.
This example selects (Ag49CuZnMnNi) brazing wire that melting range is 670 DEG C~710 DEG C, a diameter of 1mm of solder wire, by solder wire
One end is positioned over solder and adds in area.Start HF induction heating apparatus, sensing electric current is adjusted to 550A and is heated, heated 3 minutes
Afterwards, solder wire starts to melt；Sensing electric current is adjusted to 300A to keep the temperature, the solder melted after about 2 minutes is welded full of exhaust area
Seam, shuts down HF induction heating apparatus, part to be welded is cooled on fixture below solder fusing point.To gained silver molybdenum electrode welding surface
It is detected, welds ratio of brazing area up to 82%.
Above-described embodiment is only further described the purpose of the present invention, technical solution and advantageous effect specific
A example, present invention is not limited to this.All any modifications made within the scope of disclosure of the invention, change equivalent replacement
Into etc., it is all contained within protection scope of the present invention.
Claims (7)
1. a kind of welding method of silver molybdenum electrode, argentiferous 25%~60%, the silver-colored molybdenum material containing molybdenum 75%~40% are made as silver-colored molybdenum
The copper alloy of head, fine copper or more than 80% cupric is made and the matched copper seat of silver-colored molybdenum head, welding key step are as follows：
Ith, welding preparation
Silver-colored molybdenum head to be welded and the surface to be welded of copper seat are plane, and cleaning removes oxide, greasy dirt and the other impurity on surface to be welded；
IIth, part to be welded assembles
Silver-colored molybdenum head after step I cleaning and one layer of copper of each uniform smearing or copper alloy brazing mixture on the surface to be welded of copper seat, two treat
The face of weld docks, and is clamped on electrode welding fixture special, surface to be welded is horizontality；
IIIth, stop-off gent is smeared
Stop-off gent is smeared on the perimeter weld seam of surface to be welded docked in silver-colored molybdenum head and copper seat, entire weld seam perimeter is divided into
Exhaust area and solder add in area, and exhaust section length is the 25%~40% of weld seam overall circumference, and it is total for weld seam that solder adds in section length
The weld seam that the 15%~30% of perimeter, exhaust area and solder are added between area smears stop-off gent；
It is opposite with the position of weld seam residing for exhaust area that solder adds in area；
IVth, it is brazed
It will complete to be fitted into HF induction heating apparatus together with step III treated part to be welded and fixture, suitable solder will be put
Area is added in solder, starts HF induction heating apparatus and quickly heats, when observing that solder starts fusing, adjusts and adds sensing heating
Electric current is kept the temperature；Observation solder adds in the gap that fusing solder in area is inhaled into the part to be welded of docking, adds when needing in solder
Enter area's supplement solder, until observing that the solder melted occurs in exhaust area, i.e. the gap of part to be welded is full of by solder, stops adding
Heat, part to be welded are cooled to solder fusing point hereinafter, obtaining silver-colored molybdenum head and the silver-colored molybdenum electrode that is integrated of copper seat soldering on fixture.
2. the welding method of silver molybdenum electrode according to claim 1, it is characterised in that：
The solder adds in district center and is less than in the geometry with being vented the distance of the line of district center and the geometric center of surface to be welded
The heart and the 1/2 of periphery minimum range.
3. the welding method of silver molybdenum electrode according to claim 1, it is characterised in that：
The solder adds in the geometric center that district center passes through surface to be welded with being vented the line of district center.
4. the welding method of silver molybdenum electrode according to claim 1, it is characterised in that：
The stop-off gent is mixed by metal oxide and bonding agent, and the metal oxide is aluminium oxide, zirconium oxide, oxidation
The weight ratio of any one of titanium and magnesia, oxide and bonding agent is 10:(1~3).
5. the welding method of silver molybdenum electrode according to claim 4, it is characterised in that：
The bonding agent is any one of polyvinyl alcohol bonding agent, polyethylene glycol bonding agent and acrylate copolymer bonding agent.
6. the welding method of silver molybdenum electrode according to any one of claim 1 to 5, it is characterised in that：
Carried out after the docking of the surface to be welded of step II silver molybdenum head and copper seat the step III smear stop-off gent or in silver-colored molybdenum head and
Step III is carried out after copper seat clamping and smears stop-off gent.
7. the welding method of silver molybdenum electrode according to any one of claim 1 to 5, it is characterised in that：
The HF induction heating apparatus is equipped with temperature sensor and temperature real-time displaying device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611206048.3A CN108237284B (en) | 2016-12-23 | 2016-12-23 | Welding method of silver-molybdenum electrode |
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| CN201611206048.3A CN108237284B (en) | 2016-12-23 | 2016-12-23 | Welding method of silver-molybdenum electrode |
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| CN108237284A true CN108237284A (en) | 2018-07-03 |
| CN108237284B CN108237284B (en) | 2019-12-13 |
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| Publication number | Publication date |
|---|---|
| CN108237284B (en) | 2019-12-13 |
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