CN105364244A - Welding method of hard alloy and stainless steel composite rod pin - Google Patents
Welding method of hard alloy and stainless steel composite rod pin Download PDFInfo
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- CN105364244A CN105364244A CN201510959361.3A CN201510959361A CN105364244A CN 105364244 A CN105364244 A CN 105364244A CN 201510959361 A CN201510959361 A CN 201510959361A CN 105364244 A CN105364244 A CN 105364244A
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- stainless steel
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- carbide alloy
- scaling powder
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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
-
- 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
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
Abstract
The invention discloses a welding method of a hard alloy and stainless steel composite rod pin. The rod pin comprises two welding components, namely an installation part and a working part. The installation part is manufactured from stainless steel. The working part is made of hard alloy materials. The installation part and the working part are welded to form the whole rod pin through brazing filler metal. The installation part and the working part are heated through an induction coil of alternating current. The brazing filler metal is copper brazing filler metal. Scaling powder is formed by mixing copper gas welding flux and stainless steel gas welding flux based on the ratio of 2:1-1.5. The heating temperature in the welding process is 700-780 DEG C. Stress of welding portions can be reduced by preheating the various welding materials; the whole welding process is in the dust filtrated environment, so that no bubble is produced on the welding portions; in addition, the alternating current non-contact type heating way is adopted in the welding process, and therefore the welding materials can be effectively prevented from being deformed and damaged.
Description
Technical field
The present invention relates to a kind of carbide alloy of preparation method, particularly sand mill of sand mill parts product and the welding method of stainless steel compound bar pin.Be mainly used in making sand mill rod pin, belong to powder metallurgy manufacturing technology field.
background technology:
Along with the high speed development of sand milling technology, sand mill performance is also improved constantly thereupon.Therefore to the processing and fabricating of sand mill also become meticulousr, its requirement also becomes more strict.Along with the raising of sand mill performance, also more and more higher to the requirement of its core component rod pin.
The material sold for making sand mill rod is at present generally Hardmetal materials, and carbide alloy is the mixture of metal carbide powders and cobalt, and conventional metal carbides are tungsten carbides, titanium carbide etc.The rod pin of Hardmetal materials, can realize grinding raw-material efficient nano.Its wearability and intensity are far away higher than the rod pin of other material.Also have minority to adopt rare metal carbide to replace Hardmetal materials as making rod pin material, but because of its metal be rare metal, and expensive, its application is limited.
The common production method of hard alloy bar pin is two kinds: whole hard alloy and carbide alloy and other material weld online composite construction.Whole hard alloy is mounting portion and working portion is global formation.Because Hardmetal materials price is higher, processing cost is high, causes rod pin cost of manufacture expensive.Rod pin also can by the making being adopted in the mounting portion of rod pin and working portion different materials to weld rod pin respectively.Wherein mounting portion adopts stainless steel, because it can not get rusty, in abrasive product process, can not introduce impurity; Working portion adopts carbide alloy; Save Hardmetal materials with the rod pin that the method for welding makes, also reduce the cost of manufacture of rod pin accordingly.But the Hardmetal materials welding of the rod pin that the method for welding at present makes adopts gas brazing method, the uniformity of this welding method temperature, programming rate is difficult to control, and can produce larger thermograde during heating.And gas brazing heats up too fast too high, brazed seam is very easily caused to be oxidized and the serious scaling loss of solder component, and the inequality of being heated of local, product very easily bursts and chipping; Operated simultaneously slow or temperature is on the low side time solder mobility bad, form rosin joint and in weld seam, leave a large amount of pore and slag inclusion, so that seriously reducing weld strength.Necessary this to be improved.
Do not find that there is the patent literature constructed with the present invention by patent retrieval, related to the present invention mainly containing is following:
1, the patent No. is CN201510203922.7, name is called the patent of invention of " high-temp soldering method between multi-disc carbide alloy and rectangular stainless steel cutter hub ", which disclose the high-temp soldering method between a kind of multi-disc carbide alloy and rectangular stainless steel cutter hub, by 304 stainless steels, the sheet solder of carbide alloy and therebetween transition metal is ready to, stainless steel knife rest is got rid of with sand paper, the oxide layer on carbide alloy and solder surface, braze surface is cleaned with acetone, solder and transition zone alloy, then knife rest and hard metal tip face to be connected are all coated brazing flux, solder is placed between steel knife frame and carbide alloy, respectively every sheet carbide alloy is fixed on knife rest with fixture, then put into the airtight batch-type furnace passing into technical argon to heat, insulation, then with stove cool to room temperature, take out workpiece, lay down fixture.Because alloy sheet is many, because thermal expansion factor difference there occurs flexural deformation after the welding of strip cutter hub, rectification distortion of colding pressing can damage hard metal tip by pressure; Therefore the cutter welded is heated to 450 DEG C, is incubated 5 minutes, directly take out hot pressing and eliminate welding deformation, obtain the product that shape is regular, bonding strength is good.
2, the patent No. is CN201410612089.7, name is called the patent of invention of the technique of soldering stainless steel cylindrical part " on the hard alloy strip thin-wall part ", which disclose a kind of technique of soldering stainless steel cylindrical part on hard alloy strip thin-wall part, comprise: glowing furnace will be put into through pretreated hard alloy strip thin-wall part, and be warming up to 400 ~ 450 DEG C with stove; It is taken out rapidly from stove, stainless steel cylindrical part quick position in position to be welded, heat with flame, the flame envelope of flame is moved in a circle around stainless steel cylindrical part, and flame will be partial to hard alloy strip thin-wall part side in right amount, when stainless steel tubular heat parts temperature is to 650 DEG C ~ 800 DEG C, dissolve into weld seam with the agent of solder weldbonding rapidly, ensure in the welding of this temperature range complete, solder is ceased fire immediately covered with after weld seam; Welding work pieces is put into immediately 350 ~ 450 DEG C of stove tempering 5 ~ 8 hours after truce.
3, the patent No. is CN201410139226.X, name is called the patent of invention of the method for built-up welding Co-Cr-W carbide alloy " on the super-duplex stainless steel matrix ", which disclose the method for built-up welding Co-Cr-W carbide alloy on a kind of super-duplex stainless steel matrix, the method take super-duplex stainless steel as matrix material, is welded in substrate material surface built-up welding Co-Cr-W carbide alloy by tungsten argon arc; Super-duplex stainless steel composition is: Cr24-26%; Ni6-8%; Mo3-4%; N0.2-0.3%; Cu0.05-1%; W0.5-1%; C≤0.03%; Si≤1.0%; Mn≤1.0%; P≤0.03%; S≤0.01%.The present invention is by research material characteristic, Optimizing Process Parameters, welding process quality control, achieve built-up welding Co-Cr-W carbide alloy on super-duplex stainless steel matrix, obtain the test data meeting nuclear power regulation RCC-M standard-required, solve core level pump shaft cover matrix material etching problem in use.
Though these patents above-mentioned have all related to carbide alloy and stainless steel, but though the first two patent has also related to carbide alloy welds with stainless, but still be take gas brazing method, so said problem still exists above, 3rd patent refers to the method taking built-up welding on stainless steel material, by carbide reactor on stainless steel material, this and your stainless steel and carbide alloy two parts being welded proposed by the invention are not same contents, therefore prior art does not propose how to solve and adopts gas brazing method by carbide alloy and stainless steel welded existing problem, therefore be still necessary to be improved.
Summary of the invention
Object of the present invention is exactly the problem adopting carbide alloy existing when welding with stainless steel two body structure according to current hard alloy bar pin, proposes a kind ofly effectively to solve carbide alloy and stainless steel two body structure adopt problem existing for gas brazing method welding method when welding.
According to foregoing invention object, technical scheme proposed by the invention is: the welding method of a kind of carbide alloy and stainless steel compound bar pin, and rod pin comprises mounting portion and working portion two welding assembly; Wherein, mounting portion adopts stainless steel to make, and working portion adopts Hardmetal materials to make, and mounting portion and working portion are by being welded into overall rod pin; It is characterized in that, described is welded as solder weldering, and adopt the induction coil of alternating current to heat mounting portion and working portion respectively, solder adopts copper solder, the scaling powder that scaling powder adopts copper Gas welding flux and the mixing of stainless steel Gas welding flux to form, copper Gas welding flux and stainless steel Gas welding flux composition are than pressing 2:1-1.5 preparation; Heating-up temperature involved by welding procedure is 700-780 DEG C.
Further, described welding carries out in the environment of cleaning, and welding procedure is all in carries out in the air in the process of filter dirt, and air cleaner adopts the medium effeciency filter of sub-efficient box type air filter device and bag filter.
Further, described working portion needs to carry out blasting treatment to carbide alloy before welding, removing carbide filler face of weld oxide layer.
Further, described mounting portion needs also will carry out blasting treatment to stainless steel before welding, removes surface and oil contaminant, can adopt saturated borax solution, boil 20-30min when flushing dose is large, takes out post-drying and welds.
Further, before described solder uses, application alcohol is cleaned, and shaping according to faying face cutting.
Further, described mounting portion and working portion need to carry out the pre-heat treatment before welding, by adopting the induction coil of alternating current to preheat stainless steel, carbide alloy, solder and mixing scaling powder 80 DEG C respectively, are incubated 2-10 second, then naturally cool, cool time is also 2-10 second.
Further, described welding procedure concrete steps are as follows:
Step 1: welds prepares, first checks the bad defects such as whether carbide alloy has crackle, bending.Faying face needs smooth, ensures alloy and stainlessly has good contact, the quality of guarantee soldering; Stainless steel need carry out cleaning degreasing, when flushing dose is large, saturated borax solution can be adopted to boil 20-30min, takes out after drying and welds; The preparation of solder and scaling powder, solder adopts copper solder, uses front alcohol or gasoline to clean; Scaling powder adopts copper Gas welding flux and stainless steel Gas welding flux mixing scaling powder, and composition is joined than by 2:1;
Step 2: between pure air, adopts the induction coil of alternating current to preheat stainless steel, carbide alloy, solder and mixing scaling powder 80-100 DEG C respectively, and be incubated 2-10 second, then naturally cool, cool time is also 2-10 second;
Step 3: the induction coil of alternating current heats stainless steel, carbide alloy, solder and mixing scaling powder respectively until brazing filler metal melts again, add pressure bar by red copper again and beat stainless steel head gently, to make solder fully contact with stainless steel, get rid of slag and the gas of weld seam;
Step 4: the stove tempering 6-8H after soldering, workpiece being put into 220-250 DEG C, to eliminate part soldering stress, reduces crackle and extends excellent service life of selling;
Step 5: postwelding is cleared up, and clears up the rod pin welded, to be removed by solder remaining around weld seam clean, otherwise the solder unnecessary when tool sharpening by wheel topography, can make grinding difficulty;
Step 6: postwelding quality testing and following process; Main inspection carbide alloy and stainless joint quality and carbide alloy have flawless to exist, after confirmation postwelding quality is no problem, carrying out follow-up processing.
The invention has the advantages that: the present invention adopts and preheats the stress that can reduce welding position to various welding material, the whole process of welding procedure is in the environment of dirt process after filtration, welding position can be made not produce bubble, and this welding procedure adopts alternating current non-contact thermal mode, welding material can be effectively prevented to be out of shape and breakage.Preheat the stress that effectively can reduce welding position, reduce the generation probability of bubble during follow-up welding.
Accompanying drawing explanation
Fig. 1 is welding assembly side view in this welding procedure.
Fig. 2 is the flow chart of this welding procedure.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment one
A welding method for carbide alloy and stainless steel compound bar pin, rod pin comprises mounting portion 1 and working portion 2 liang of welding assemblies; Wherein, mounting portion 1 adopts stainless steel to make, and working portion 2 adopts Hardmetal materials to make, and mounting portion 1 and working portion 2 are welded into overall rod pin by solder 3 and scaling powder 4; It is characterized in that, described is welded as solder weldering, and adopt the induction coil of alternating current to heat mounting portion and working portion respectively, solder 3 adopts copper solder, the scaling powder that scaling powder 4 adopts copper Gas welding flux and the mixing of stainless steel Gas welding flux to form, copper Gas welding flux and stainless steel Gas welding flux composition are than pressing 2:1-1 preparation; Heating-up temperature involved by welding procedure is 700-750 DEG C.
Described welding procedure concrete steps are as follows:
Step 1: welds prepares, first checks the bad defects such as whether carbide alloy has crackle, bending.Faying face needs smooth, ensures alloy and stainlessly has good contact, the quality of guarantee soldering; Stainless steel need carry out cleaning degreasing, when flushing dose is large, saturated borax solution can be adopted to boil 25min, takes out after drying and welds; The preparation of solder and scaling powder, solder adopts copper solder, uses front alcohol or gasoline to clean, and shaping according to faying face cutting; Scaling powder adopts copper Gas welding flux and stainless steel Gas welding flux mixing scaling powder, and composition is joined than by 2:1, and removal oxide that like this can be effective, reduces the surface tension of soldered material;
Step 2: between pure air, adopt the induction coil of alternating current to preheat stainless steel, carbide alloy, solder and mixing scaling powder 80 DEG C respectively, be incubated for 2 seconds, then naturally cool, cool time was also 2 seconds; Preheat the stress that effectively can reduce welding position, reduce the generation probability of bubble during follow-up welding.The time of pre-warmed time and cooling is all unsuitable long, if overlong time just can not play preheat due effect.
Step 3: the induction coil of alternating current heats stainless steel, carbide alloy, solder and mixing scaling powder respectively until brazing filler metal melts again, add pressure bar by red copper again and beat stainless steel head gently, to make solder fully contact with stainless steel, get rid of slag and the gas of weld seam; Rethermalization time, temperature and speed also will be suitable for, because firing rate has obvious impact to brazing quality, the too high meeting of Fast Heating temperature causes weld seam to be oxidized and carbide alloy produces non-uniform temperature generation crackle; But heated slow temperature is too low also can make surface oxidation, make strength of joint reduce and weld seam can be partially thick because solder fluidity is bad, have a large amount of pore and slag inclusion very easily to cause sealing-off in weld seam; In the present embodiment, preferably rethermalization time is 8 seconds, and firing rate is 80-100 DEG C/S.Again should be correct in heating process lay solder, mixing scaling powder, stainless lay order because its order welding quality laid has direct impact.Correct order of laying is: spread mixing scaling powder at hard alloy inner hole, again solder is put into hard alloy inner hole, spread mixing scaling powder again, one deck scaling powder is sprinkled again to carbide alloy end face, put stainless steel again, be convenient to when soldering like this grasp brazing temperature, reduce outside weld seam and stick unnecessary solder.After brazing filler metal melts, then add pressure bar by red copper and beat stainless steel head gently, to make solder fully contact with stainless steel, get rid of slag and the gas of weld seam.
Step 4: tempering in stove.After soldering, workpiece is put into the stove tempering 6H of 220-230 DEG C, to eliminate part soldering stress, reduce crackle and extend excellent service life of selling;
Step 5: postwelding is cleared up.Clear up the rod pin welded, to be removed by solder remaining around weld seam clean, otherwise the solder unnecessary when tool sharpening by wheel topography, can make grinding difficulty.The residual solder of postwelding also can corrode weld seam or matrix, adopts the workpiece cooled is put into boiling water to boil 1-2 hours, then blasting treatment.
Step 6: postwelding quality testing and following process.Postwelding quality testing and following process; Main inspection carbide alloy and stainless joint quality and carbide alloy have flawless to exist.Rod pin is after blasting treatment, first with kerosene cleaning, then with the naked eye or amplify Microscopic observation, when rod pin there being crackle, surface have obvious black line or with 65% the kerosene transformer oil that adds 30% add 5% turpentine oil furnishing solution, put into a small amount of tonyred again, rod pin is put into this solution and soaks about 10min, take out clear water and clean, coat kaolin again, detect surface after oven dry, the color if any crackle solution just can show on carclazyte, with the naked eye can significantly see.Stainless thread turning processing is being carried out after confirmation postwelding quality is no problem.
Embodiment two
The principle of embodiment two is the same with embodiment one, just some difference of some concrete parameters.Described welding procedure concrete steps are as follows:
Step 1: welds prepares, first checks the bad defects such as whether carbide alloy has crackle, bending.Faying face needs smooth, ensures alloy and stainlessly has good contact, the quality of guarantee soldering; Stainless steel need carry out cleaning degreasing, when flushing dose is large, saturated borax solution can be adopted to boil 30min, takes out after drying and welds; The preparation of solder and scaling powder, solder adopts copper solder, uses front alcohol or gasoline to clean; Scaling powder adopts copper Gas welding flux and stainless steel Gas welding flux mixing scaling powder, and composition is joined than by 2:1.5;
Step 2: between pure air, adopt the induction coil of alternating current to preheat stainless steel, carbide alloy, solder and mixing scaling powder 80 DEG C respectively, be incubated for 10 seconds, then naturally cool, cool time was also 10 seconds;
Step 3: the induction coil of alternating current heats stainless steel, carbide alloy, solder and mixing scaling powder respectively until brazing filler metal melts again, add pressure bar by red copper again and beat stainless steel head gently, to make solder fully contact with stainless steel, get rid of slag and the gas of weld seam;
Step 4: the stove tempering 8H after soldering, workpiece being put into 220-230 DEG C, to eliminate part soldering stress, reduces crackle and extends excellent service life of selling;
Step 5: postwelding is cleared up, and clears up the rod pin welded, to be removed by solder remaining around weld seam clean, otherwise the solder unnecessary when tool sharpening by wheel topography, can make grinding difficulty;
Step 6: postwelding quality testing and following process; Main inspection carbide alloy and stainless joint quality and carbide alloy have flawless to exist, after confirmation postwelding quality is no problem, carrying out follow-up processing.
The advantage of invention is: the present invention adopts and preheats the stress that can reduce welding position to various welding material, the whole process of welding procedure is in the environment of dirt process after filtration, welding position can be made not produce bubble, and this welding procedure adopts alternating current non-contact thermal mode, welding material can be effectively prevented to be out of shape and breakage.
Above embodiment is just in order to illustrate the present invention, and cited some more preferably detailed description of the invention, the usual change that those skilled in the art carry out within the scope of the technical program and replacing should be included in protection scope of the present invention.Preheat the stress that effectively can reduce welding position, reduce the generation probability of bubble during follow-up welding.
Claims (7)
1. a welding method for carbide alloy and stainless steel compound bar pin, rod pin comprises mounting portion and working portion two welding assembly; Wherein, mounting portion adopts stainless steel to make, and working portion adopts Hardmetal materials to make, and mounting portion and working portion are by being welded into overall rod pin; It is characterized in that, described is welded as solder weldering, and adopt the induction coil of alternating current to heat mounting portion and working portion respectively, solder adopts copper solder, the scaling powder that scaling powder adopts copper Gas welding flux and the mixing of stainless steel Gas welding flux to form, copper Gas welding flux and stainless steel Gas welding flux composition are than pressing 2:1-1.5 preparation; Heating-up temperature involved by welding procedure is 700-780 DEG C.
2. the welding method of carbide alloy as claimed in claim 1 and stainless steel compound bar pin, it is characterized in that: described welding carries out in the environment of cleaning, welding procedure is all in carries out in the air in the process of filter dirt, and air cleaner adopts the medium effeciency filter of sub-efficient box type air filter device and bag filter.
3. the welding method of carbide alloy as claimed in claim 2 and stainless steel compound bar pin, is characterized in that: described working portion needs to carry out blasting treatment to carbide alloy before welding, removing carbide filler face of weld oxide layer.
4. the welding method of carbide alloy as claimed in claim 2 and stainless steel compound bar pin, it is characterized in that: described mounting portion needs also will carry out blasting treatment to stainless steel before welding, remove surface and oil contaminant, saturated borax solution can be adopted when flushing dose is large, boil 20-30min, take out post-drying and weld again.
5. the welding method of carbide alloy as claimed in claim 2 and stainless steel compound bar pin, is characterized in that: before described solder uses, application alcohol is cleaned, and shaping according to faying face cutting.
6. the welding method of carbide alloy as claimed in claim 2 and stainless steel compound bar pin, it is characterized in that: described mounting portion and working portion need to carry out the pre-heat treatment before welding, stainless steel, carbide alloy, solder and mixing scaling powder 80 DEG C is preheated respectively by adopting the induction coil of alternating current, be incubated 2-10 second, then naturally cool, cool time is also 2-10 second.
7. the welding method of carbide alloy as claimed in claim 1 and stainless steel compound bar pin, is characterized in that: described welding procedure concrete steps are as follows:
Step 1: welds prepares, first checks the bad defects such as whether carbide alloy has crackle, bending, and faying face needs smooth, ensures alloy and stainlessly has good contact, the quality of guarantee soldering; Stainless steel need carry out cleaning degreasing, when flushing dose is large, saturated borax solution can be adopted to boil 20-30min, takes out after drying and welds; The preparation of solder and scaling powder, solder adopts copper solder, uses front alcohol or gasoline to clean; Scaling powder adopts copper Gas welding flux and stainless steel Gas welding flux mixing scaling powder, and composition is joined than by 2:1;
Step 2: between pure air, adopts the induction coil of alternating current to preheat stainless steel, carbide alloy, solder and mixing scaling powder 80-100 DEG C respectively, and be incubated 2-10 second, then naturally cool, cool time is also 2-10 second;
Step 3: the induction coil of alternating current heats stainless steel, carbide alloy, solder and mixing scaling powder respectively until brazing filler metal melts again, add pressure bar by red copper again and beat stainless steel head gently, to make solder fully contact with stainless steel, get rid of slag and the gas of weld seam;
Step 4: the stove tempering 6-8H after soldering, workpiece being put into 220-250 DEG C, to eliminate part soldering stress, reduces crackle and extends excellent service life of selling;
Step 5: postwelding is cleared up, and clears up the rod pin welded, to be removed by solder remaining around weld seam clean, otherwise the solder unnecessary when tool sharpening by wheel topography, can make grinding difficulty;
Step 6: postwelding quality testing and following process; Main inspection carbide alloy and stainless joint quality and carbide alloy have flawless to exist, after confirmation postwelding quality is no problem, carrying out follow-up processing.
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| CN106180938A (en) * | 2016-08-31 | 2016-12-07 | 南昌工程学院 | Sensing adds the method for tungsten carbide wear-resistant coating needed for hot preparation pendulum mill yaw |
| CN109624332A (en) * | 2019-01-16 | 2019-04-16 | 山东太极龙塑胶科技有限公司 | Nonmetallic materials are vortexed welding method |
| CN109732167A (en) * | 2018-12-10 | 2019-05-10 | 江苏科技大学 | For copper/aluminum pipe part brazing device and its method for welding |
| CN109773295A (en) * | 2019-02-28 | 2019-05-21 | 北京卫星制造厂有限公司 | A kind of lunar soil is drilled through with drill bit soldering and lossless detection method |
| CN110091023A (en) * | 2019-06-11 | 2019-08-06 | 莱芜职业技术学院 | A kind of vacuum welding method of titanium carbide steel bonded carbide and steel alloy |
| CN110303226A (en) * | 2019-07-17 | 2019-10-08 | 河南省煤科院耐磨技术有限公司 | A kind of method for embedding of hard alloy blocks |
| CN110625144A (en) * | 2019-10-21 | 2019-12-31 | 宁波红日工具有限公司 | Cutter and welding process thereof |
| CN111054928A (en) * | 2019-12-25 | 2020-04-24 | 西华大学 | Preparation method of hard alloy/steel welding part |
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