CN106425328A - QCr0.8 and high-strength stainless steel CMT welding process - Google Patents
QCr0.8 and high-strength stainless steel CMT welding process Download PDFInfo
- Publication number
- CN106425328A CN106425328A CN201611097079.XA CN201611097079A CN106425328A CN 106425328 A CN106425328 A CN 106425328A CN 201611097079 A CN201611097079 A CN 201611097079A CN 106425328 A CN106425328 A CN 106425328A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- strength stainless
- high strength
- welding
- wall thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- 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
- B23K2103/22—Ferrous alloys and copper or alloys thereof
Abstract
The invention discloses a QCr0.8 and high-strength stainless steel CMT welding process. The CMT welding process is applied to welding of QCr0.8 and high-strength stainless steel by five steps of polishing of the high-strength stainless steel, polishing of a QCr0.8 part, matching of the two after polishing, welding and treatment after welding; welding heads of the QCr0.8 part and the high-strength stainless steel are set as two different structures, so that the welding firmness of the two is enhanced through different welding heads along with the wall thickness difference of the QCr0.8 part 1; and meanwhile, the CMT welding process can guarantee the welding quality and stability.
Description
Technical field
The present invention relates to the CMT welding procedure of welding technique field, specially a kind of QCr0.8 and high strength stainless steel.
Background technology
Carry out the welding of QCr0.8 chromium-bronze and high strength stainless steel at this stage using manual argon arc welding.The method is right first
Steel side welding surface is polished, then using copperwelding rod, using method welding QCr0.8 chromium-bronze and the height of manual argon arc welding
Strong rustless steel lap joint, the radiating of QCr0.8 chromium-bronze is very fast, is formed effectively for ensureing that the fusion of copper side is good, at welding point
Molten bath, typically carries out QCr0.8 chromium-bronze and the welding of high strength stainless steel manual argon arc welding by the way of low weldering speed, high current.But
It is that it is excessive that this kind of method easily causes thermal weld stress.When heat input increases, easily produce fire check in face of weld, meanwhile,
The contamination cracking of liquid copper will be formed in the steel side of weld seam internal copper-steel junction, thereby result in the intensity of copper-steel attachment weld
It is greatly reduced.Meanwhile, during manual welding, welding line joint is more, joint because the starting the arc, receive arc and be repeatedly heated so that crystal grain is seriously long
Greatly, thus herein plasticity of weld seam etc. be remarkably decreased；Cold metal transfer technology in prior art（It is commonly called as CMT）It is a kind of brand-new
Welding procedure, is used in QCr0.8 chromium-bronze and the welding procedure of high strength stainless steel and not only can be realized in welding process
Cold and heat succeed each other moreover it is possible to avoid molten drop to penetrate realize no splash droplet transfer and good metallurgical connection, the method is applied to wall
The QCr0.8 chromium-bronze of thick 8mm 12mm and high strength stainless steel（Wall thickness is more than or equal to 10mm）Welding procedure in.
Content of the invention
It is an object of the invention to provide the CMT welding procedure of a kind of QCr0.8 and high strength stainless steel, to solve the above-mentioned back of the body
The problem proposing in scape technology.
For achieving the above object, the present invention provides following technical scheme：A kind of QCr0.8 is welded with the CMT of high strength stainless steel
Technique, including QCr0.8 part and high strength stainless steel, this welding procedure comprises the following steps：
S1：On dedicated numerical control shearing machine, high strength stainless steel is carried out with polishing shearing pretreatment process it is ensured that the table of high strength stainless steel
Face fineness≤2.8um；The lap joint with certain tilted shape is polished at the plumb joint of high strength stainless steel；
S2：Polishing process is carried out to QCr0.8 part, polish the effigurate lap joint of tool；Wall thickness when QCr0.8 part
During more than 4mm, inclined wall is processed to QCr0.8 part；When the wall thickness of QCr0.8 part is less than 4mm, QCr0.8 part is added
Work goes out flange skew wall；
S3：By to-be-welded pieces QCr0.8 part and high strength stainless steel clamping it is ensured that the lap joint of QCr0.8 part is stainless with high-strength
The lap joint phase of steel is agreed with, and the lap joint after agreeing with is placed in below bonding machine, and with fixture by QCr0.8 part and high-strength
Rustless steel is fixed；
S4：Welded, controlled speed of welding, welding current, weldingvoltage, wire feed rate, the amplitude of oscillation and the slew rate of bonding machine；
S5：After welding, when the temperature of commissure is down to 30 DEG C -40 DEG C, face of weld oxide layer is cleared up.
Preferably, in step S1 the lap joint that high strength stainless steel is polished shape according to QCr0.8 part thickness and
Fixed；When the wall thickness of QCr0.8 part is more than 4mm, the lap joint of high strength stainless steel is flange plumb joint；When QCr0.8 part
When wall thickness is less than 4mm, the lap joint of high strength stainless steel is spill soldering opening.
Preferably, when the wall thickness of QCr0.8 part is more than 4mm, between leaving between described flange plumb joint and inclined wall
Gap, clearance distance is L2（1.5mm≤L2≤2.5mm）, it is in certain inclination between described inclined wall and high strength stainless steel upper surface
Angle a（15°≤a≤30°）.
Preferably, when the wall thickness of QCr0.8 part is less than 4mm, between leaving between described spill soldering opening and flange skew wall
Gap, clearance distance is L2（2.5mm≤L2≤3.5mm）, it is in a constant inclination between described flange skew wall and high strength stainless steel upper surface
Rake angle a（30°≤a≤35°）.
Preferably, when the wall thickness of QCr0.8 part is more than 4mm, speed of welding is 40-55cm/min, welding current is
180-220A, weldingvoltage are 18-29V, wire feed rate is 7-9m/min, the amplitude of oscillation is 0.5mm, slew rate controls in 900cm/min.
Preferably, when the wall thickness of QCr0.8 part is less than 4mm, speed of welding is 28-34cm/min, welding current is
160-188A, weldingvoltage are 12-22V, wire feed rate is 4-7m/min, the amplitude of oscillation is 0.2mm, slew rate controls in 900cm/min.
Compared with prior art, the invention has the beneficial effects as follows：The plumb joint of QCr0.8 part and high strength stainless steel is set
It is set to two kinds of different structures, can be very good to ensure the difference with QCr0.8 part 1 wall thickness, connect by different welding
Head strengthens firm welding between the two, and CMT welding procedure can ensure that the quality of welding and stablizes simultaneously.
Brief description
Fig. 1 is the first lap joint structural representation of the present invention；
Fig. 2 is the welding posture schematic diagram of the first lap joint version of the present invention；
Fig. 3 is second lap joint structural representation of the present invention；
Fig. 4 is the welding posture schematic diagram of second lap joint version of the present invention.
In figure：1 QCr0.8 part, 11 inclined walls, 12 flange skew walls, 2 high strength stainless steels, 21 flange plumb joints, 22 spills
Soldering opening.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Embodiment 1
Refering to Fig. 1 and 2, the present invention provides a kind of technical scheme：A kind of QCr0.8 and the CMT welding procedure of high strength stainless steel, wrap
Include QCr0.8 part 1 and high strength stainless steel 2, this welding procedure comprises the following steps：
S1：On dedicated numerical control shearing machine, high strength stainless steel is carried out with polishing shearing pretreatment process it is ensured that the table of high strength stainless steel
Face fineness is 2um；The wall thickness of QCr0.8 part is more than 4mm, and the plumb joint of high strength stainless steel is polished as flange plumb joint 21；
S2：The wall thickness of QCr0.8 part is more than 4mm, processes inclined wall 11 to QCr0.8 part；
S3：By to-be-welded pieces QCr0.8 part with high strength stainless steel clamping it is ensured that inclined wall 11 mutually agrees with flange plumb joint 21,
Lap joint after agreeing with is placed in below bonding machine, and with fixture, QCr0.8 part and high strength stainless steel is fixed；
S4：Welded, the speed of welding controlling bonding machine is 45cm/min, welding current is 200A, weldingvoltage is 18V,
Wire feed rate is 8m/min, the amplitude of oscillation is 0.5mm, slew rate controls in 900cm/min；
S5：After welding, when the temperature of commissure is down to 30 DEG C, face of weld oxide layer is cleared up.
Embodiment 2
Refering to Fig. 3 and 4, the present invention provides a kind of technical scheme：A kind of QCr0.8 and the CMT welding procedure of high strength stainless steel, wrap
Include QCr0.8 part 1 and high strength stainless steel 2, this welding procedure comprises the following steps：
S1：On dedicated numerical control shearing machine, high strength stainless steel is carried out with polishing shearing pretreatment process it is ensured that the table of high strength stainless steel
Face fineness is 1.8um；The wall thickness of QCr0.8 part is less than 4mm, and the plumb joint of high strength stainless steel is polished as spill soldering opening
22；
S2：The wall thickness of QCr0.8 part is less than 4mm, processes flange skew wall 12 to QCr0.8 part；
S3：By to-be-welded pieces QCr0.8 part and high strength stainless steel clamping it is ensured that flange skew wall 12 and spill soldering opening 22 phase contract
Close, the lap joint after agreeing with is placed in below bonding machine, and with fixture, QCr0.8 part and high strength stainless steel is fixed；
S4：Welded, the speed of welding controlling bonding machine is 31cm/min, welding current is 170A, weldingvoltage is 16V,
Wire feed rate is 5m/min, the amplitude of oscillation is 0.2mm, slew rate controls in 900cm/min；
S5：After welding, when the temperature of commissure is down to 40 DEG C, face of weld oxide layer is cleared up.
QCr0.8 part 1 and the plumb joint of high strength stainless steel 2 are arranged to two kinds of different structures by the present invention, can be very
The good difference ensureing with QCr0.8 part 1 wall thickness, by different welding point enhancings firm welding between the two
Property, CMT welding procedure can ensure that the quality of welding and stablizes simultaneously.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible
Understand and can carry out multiple changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (6)
1. the CMT welding procedure of a kind of QCr0.8 and high strength stainless steel, including QCr0.8 part（1）And high strength stainless steel（2）, its
It is characterised by, this welding procedure comprises the following steps：
S1：On dedicated numerical control shearing machine, high strength stainless steel is carried out with polishing shearing pretreatment process it is ensured that the table of high strength stainless steel
Face fineness≤2.8um；The lap joint with certain tilted shape is polished at the plumb joint of high strength stainless steel；
S2：Polishing process is carried out to QCr0.8 part, polish the effigurate lap joint of tool；Wall thickness when QCr0.8 part
During more than 4mm, inclined wall is processed to QCr0.8 part（11）；When the wall thickness of QCr0.8 part is less than 4mm, to QCr0.8 zero
Part processes flange skew wall（12）；
S3：By to-be-welded pieces QCr0.8 part and high strength stainless steel clamping it is ensured that the lap joint of QCr0.8 part is stainless with high-strength
The lap joint phase of steel is agreed with, and the lap joint after agreeing with is placed in below bonding machine, and with fixture by QCr0.8 part and high-strength
Rustless steel is fixed；
S4：Welded, controlled speed of welding, welding current, weldingvoltage, wire feed rate, the amplitude of oscillation and the slew rate of bonding machine；
S5：After welding, when the temperature of commissure is down to 30 DEG C -40 DEG C, face of weld oxide layer is cleared up.
2. a kind of QCr0.8 according to claim 1 and high strength stainless steel CMT welding procedure it is characterised in that：Step
In S1, the shape of the lap joint that high strength stainless steel is polished is depending on the thickness of QCr0.8 part；Wall thickness when QCr0.8 part
During more than 4mm, the lap joint of high strength stainless steel is flange plumb joint（21）；When the wall thickness of QCr0.8 part is less than 4mm, high-strength
Stainless lap joint is spill soldering opening（22）.
3. a kind of QCr0.8 according to claim 2 and high strength stainless steel CMT welding procedure it is characterised in that：When
When the wall thickness of QCr0.8 part is more than 4mm, described flange plumb joint（21）With inclined wall（11）Between leave gap, clearance distance
For L2（1.5mm≤L2≤2.5mm）, described inclined wall（11）It is in certain angle of inclination a and high strength stainless steel upper surface between
（15°≤a≤30°）.
4. a kind of QCr0.8 according to claim 2 and high strength stainless steel CMT welding procedure it is characterised in that：When
When the wall thickness of QCr0.8 part is less than 4mm, described spill soldering opening（22）With flange skew wall（12）Between leave gap, clearance gap
From for L2（2.5mm≤L2≤3.5mm）, described flange skew wall（12）It is in certain angle of inclination and high strength stainless steel upper surface between
a（30°≤a≤35°）.
5. a kind of QCr0.8 according to claim 1 and high strength stainless steel CMT welding procedure it is characterised in that：When
When the wall thickness of QCr0.8 part is more than 4mm, speed of welding is 40-55cm/min, welding current is 180-220A, weldingvoltage is
18-29V, wire feed rate are 7-9m/min, the amplitude of oscillation is 0.5mm, slew rate controls in 900cm/min.
6. a kind of QCr0.8 according to claim 1 and high strength stainless steel CMT welding procedure it is characterised in that：When
When the wall thickness of QCr0.8 part is less than 4mm, speed of welding is 28-34cm/min, welding current is 160-188A, weldingvoltage is
12-22V, wire feed rate are 4-7m/min, the amplitude of oscillation is 0.2mm, slew rate controls in 900cm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097079.XA CN106425328B (en) | 2016-12-02 | 2016-12-02 | A kind of CMT welding procedures of QCr0.8 and high strength stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611097079.XA CN106425328B (en) | 2016-12-02 | 2016-12-02 | A kind of CMT welding procedures of QCr0.8 and high strength stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106425328A true CN106425328A (en) | 2017-02-22 |
| CN106425328B CN106425328B (en) | 2018-05-22 |
Family
ID=58223604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611097079.XA Active CN106425328B (en) | 2016-12-02 | 2016-12-02 | A kind of CMT welding procedures of QCr0.8 and high strength stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106425328B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107313A1 (en) * | 2016-12-12 | 2018-06-21 | 机械科学研究总院青岛分院有限公司 | Qcr0.8 and high-strength stainless steel cmt welding process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108448A (en) * | 1984-10-13 | 1986-08-13 | 肯纳科特公司 | Welding point |
| US4722125A (en) * | 1984-05-25 | 1988-02-02 | Peng Da H | Method for producing a tungsten carbide tip punch |
| DE102004029230A1 (en) * | 2004-06-17 | 2006-01-12 | Thyssenkrupp Stahl Ag | Metallic join partners` connecting method for manufacturing vehicle body, involves grouting two join partners, so that material of latter partner penetrates into recess of former partner to produce fixed connection between partners |
| CN1988979A (en) * | 2004-06-02 | 2007-06-27 | 美铝公司 | Gas metal buried arc welding of lap-penetration joints |
| CN101758326A (en) * | 2009-11-04 | 2010-06-30 | 中国船舶重工集团公司第七二五研究所 | Plasma-arc welding method of cupronickel with thickness of 2-20 mm |
| JP2011067830A (en) * | 2009-09-24 | 2011-04-07 | Nippon Steel Techno Research Corp | Method of joining copper sheet and steel sheet by laser |
| CN102179678A (en) * | 2011-06-02 | 2011-09-14 | 四川省南充东力连杆有限公司 | Method for producing axle by welding medium plates |
-
2016
- 2016-12-02 CN CN201611097079.XA patent/CN106425328B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4722125A (en) * | 1984-05-25 | 1988-02-02 | Peng Da H | Method for producing a tungsten carbide tip punch |
| CN85108448A (en) * | 1984-10-13 | 1986-08-13 | 肯纳科特公司 | Welding point |
| CN1988979A (en) * | 2004-06-02 | 2007-06-27 | 美铝公司 | Gas metal buried arc welding of lap-penetration joints |
| DE102004029230A1 (en) * | 2004-06-17 | 2006-01-12 | Thyssenkrupp Stahl Ag | Metallic join partners` connecting method for manufacturing vehicle body, involves grouting two join partners, so that material of latter partner penetrates into recess of former partner to produce fixed connection between partners |
| JP2011067830A (en) * | 2009-09-24 | 2011-04-07 | Nippon Steel Techno Research Corp | Method of joining copper sheet and steel sheet by laser |
| CN101758326A (en) * | 2009-11-04 | 2010-06-30 | 中国船舶重工集团公司第七二五研究所 | Plasma-arc welding method of cupronickel with thickness of 2-20 mm |
| CN102179678A (en) * | 2011-06-02 | 2011-09-14 | 四川省南充东力连杆有限公司 | Method for producing axle by welding medium plates |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107313A1 (en) * | 2016-12-12 | 2018-06-21 | 机械科学研究总院青岛分院有限公司 | Qcr0.8 and high-strength stainless steel cmt welding process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106425328B (en) | 2018-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100556602C (en) | The method of soldering of ultrasonic wave auxiliary laser or laser braze-welding | |
| CN105127566B (en) | The complete penetraction and fusion in welding welding method of big thickness carbon steel stainless steel clad plate | |
| KR20080081796A (en) | One side welding method of butt-welded joints | |
| CN103962715B (en) | A kind of stirring friction-welding technique method of VCP | |
| CN105312741A (en) | TIP TIG welding method of LNG storage tanks | |
| CN101862913A (en) | Electromagnetic current coupling field assisted hybrid melting-brazing method for laser-TIG arc and equipment | |
| CN103567654A (en) | Welding material and welding method for titanium-steel composite board | |
| CN106001967A (en) | Butt welding method for double-layer metal composite boards | |
| CN108296603B (en) | Double-sided double-arc vertical welding penetration control device and welding method thereof | |
| CN106903401A (en) | Obliquity buried arc welding method | |
| CN113714622A (en) | Friction-stirring double-sided Z-shaped butt/lap composite welding method for medium-thickness plate heterogeneous material and application | |
| CN109848522A (en) | A kind of two-phase stainless steel sheet ultrasonic wave added GTAW pulsating arc welding method | |
| CN102248281B (en) | Thick plate joint welding method | |
| CN101559549A (en) | Process method for rewelding of high strength steel | |
| CN113941777A (en) | Thick plate ultrahigh-power laser scanning-high-frequency pulse deep melting TIG (tungsten inert gas) hybrid welding method | |
| CN106425328B (en) | A kind of CMT welding procedures of QCr0.8 and high strength stainless steel | |
| CN108067704B (en) | CMT welding process of 1Cr18Ni9Ti stainless steel and 5A06 aluminum alloy | |
| CN104057187B (en) | The semi-automatic TIG welding of a kind of more than 6mm aluminium alloy plate jigsaw connects method | |
| CN101642839B (en) | Drill welding technology | |
| CN105345230A (en) | Argon arc brazing method for patch welding brazing seams of rotor connecting ring of shielding motor | |
| CN102848086A (en) | Method for improving strength and flexibility of super strength steel laser-arc hybrid welded joint | |
| CN105312790A (en) | Cold metal transfer (CMT) welding process of QCr 0.8 and high-strength stainless steel | |
| CN103464855B (en) | The large area carbide alloy method for welding of standing wave constraint | |
| KR100895348B1 (en) | Method of gas tungsten arc welding using by active flux | |
| CN114888410B (en) | Welding process for reverse welding of duplex stainless steel composite plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant after: Qingdao Branch Co., Ltd. of Mechanical Science Research Institute Address before: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant before: Qingdao Branch of General Research Institute of Mechanical Science |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266300 South Head of Huiying Street, Jiaozhou Economic and Technological Development Zone, Qingdao City, Shandong Province Patentee after: China National Academy of Machinery Group Qingdao Branch Co.,Ltd. Address before: 266300 South Head of Huiying Street, Jiaozhou Economic and Technological Development Zone, Qingdao City, Shandong Province Patentee before: Qingdao Branch Co., Ltd. of Mechanical Science Research Institute |