CN108265290A - A kind of surface reinforcing method of natural gas reciprocating compressor piston rod - Google Patents
A kind of surface reinforcing method of natural gas reciprocating compressor piston rod Download PDFInfo
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- CN108265290A CN108265290A CN201810184028.3A CN201810184028A CN108265290A CN 108265290 A CN108265290 A CN 108265290A CN 201810184028 A CN201810184028 A CN 201810184028A CN 108265290 A CN108265290 A CN 108265290A
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- piston rod
- cladding
- laser
- reinforcing method
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
- C23C24/106—Coating with metal alloys or metal elements only
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
Abstract
The present invention proposes a kind of surface reinforcing method of natural gas reciprocating compressor piston rod, including：1）Design and the thickness for calculating piston rod surface strengthening layer；2）Testing new process verification is carried out to used laser cladding of material, cladding parameter and process conditions；3）According to qualification test conclusion, laser melting coating is carried out to piston rod surface, cladding dusty material chemical composition is C：≤ 0.2%, Si：≤ 0.5%, Mn：≤ 1.2%, Cr：17 ~ 19%, Ni：1.5~2.5%；4）It carries out non-destructive testing；5）Machining；6）Final inspection：Including size detection, precision and roughness, hardness determination and non-destructive testing.It is metallurgically combined with base material by the strengthening layer of surface reinforcing method of the present invention treated piston rod surface, intensity is high, hardness number is higher than 52HRC, heat affected area width is less than 0.8mm, and do not influence base material mechanical performance, therefore the method for the invention is suitable for the surface Hardening Treatment of piston rod, also remanufactures, has a extensive future available for waste and old piston rod.
Description
Technical field
The present invention relates to surface treatment laser melting and coating techniques, and in particular to a kind of table of natural gas reciprocating compressor piston rod
Surface strengthening method.
Background technology
Natural gas reciprocating compressor is one of key equipment to tap natural gas, mainly by host, fuel supply and
Governing system, engine intake and exhaust system, ignition system, lubricating system, cooling system, activation system, blind controller system, instrument
Table controls and safety system, gas separation and process piping systems composition.Unit is power and pressure using natural gas as fuel
Contracting shares a bent axle and a fuselage, forms complete machine unit.Piston component is natural gas compressor power end and compression end
The failure mode of powerdriven critical component, wherein piston rod is mainly the abrasion of filler, oil wiper to piston rod surface, and
Piston rod bears drawingand pressing fatigue and surface contact fatigue is also easy to cause its failure etc..The surface peening of piston rod in the prior art
Processing method includes the techniques such as plating hard chrome, thermal spraying hard material.But since plating chromium process causes environment
Pollution, gradually forbidden or banned by national legislation；And the bond strength between the coating and matrix that hot-spraying technique is formed is low,
So that coating easily come off to be formed hard substance cause piston rod scratch etc..Therefore a kind of new process for treating surface is needed to replace existing
There is technique to carry out intensive treatment to natural gas piston rod surface.
Invention content
The object of the present invention is to provide a kind of method for surface hardening of natural gas reciprocating compressor piston rod, according to state
The requirement of border or national standard for the wearability, corrosion resistance of the surface treatment of natural gas reciprocating compressor piston rod, selection
Matched increasing material material, the process that remanufactures of reasonable design solve the problems, such as that prior art surface Hardening Treatment exists, and
Establish more complete piston rod surface reinforcement process technical method and appraisement system.Key technology of the present invention is melted using laser
Coating technique strengthens piston rod surface, while the method for the invention can be used for remanufacturing for waste and old piston rod, after remanufacturing
Every technical performance of piston rod meet the performance requirement of former new product, and waste and old piston rod is become useless by the method for the invention
For treasured, restore its performance, meet the development strategy of National Industrial green manufacturing, there is wide popularizing application prospect.
It is as follows that the present invention solves the technical solution that above-mentioned technical problem is taken：
A kind of surface reinforcing method of natural gas reciprocating compressor piston rod, includes the following steps：
Step 1: determine that piston rod surface plans the thickness of surface peening layer to be formed；
Step 2: carried out non-destructive testing to piston rod surface, after testing without carrying out step 3 after any crack defect；
Step 3: Laser Cladding Treatment is carried out to piston rod surface, in the cladding of thickness described in piston rod surface forming step one
Metal layer is as surface peening layer；
Step 4: the piston rod surface after Laser Cladding Treatment is carried out non-destructive testing again, after testing without any crack defect
After carry out step 5；
Step 5: piston rod is required to be machined out according to target size；
Step 6: the piston rod after machining is carried out non-destructive testing, size detection and/or hardness determination.
Further surface reinforcing method according to the present invention, wherein in step 1, is born according to piston rod
Maximum load is determined to calculate the minimum diameter size of piston rod strut stability based on maximum load and minimum diameter size
It is formed in the thickness of the surface peening layer of piston rod surface.
Further surface reinforcing method according to the present invention, what is determined wherein in step 1 is formed in piston rod table
The thickness of the surface peening layer in face is 0.5 ~ 1.0mm.
Further surface reinforcing method according to the present invention, wherein in step 2 and step 4, using 100% table
Face colouring Liquid penetrant testing（PT）, 100% Magnetic testing（MT）And/or 100% ultrasonic examination detection（UT）To piston rod surface into
Row non-destructive testing.
Further surface reinforcing method according to the present invention, wherein in step 3, what Laser Cladding Treatment used
The chemical component weight percentage of laser cladding powder powder material forms：C：0.1% ~ 0.2%, Si：≤ 0.8%, Mn：≤ 1.0%,
Cr：17% ~ 19%, Ni：1.5 ~ 2.5%, remaining is Fe；Laser Cladding Treatment is added powder and combined using coaxial powder-feeding mode justifies
Shape hot spot carries out cladding, and cladding laser is semiconductor coupling optical-fiber type laser；The cladding parameter and work of Laser Cladding Treatment
Skill condition is：2000 ~ 3500W of laser power, 8 ~ 10mm/s of sweep speed, cladding overlapping rate 40 ~ 50%, 15 ~ 22g/ of powder sending quantity
Min, 1 layer of the number of clad layers or more, cladding protective gas are compressed air, nitrogen or argon gas.
Further surface reinforcing method according to the present invention, wherein in step 3, is existed by Laser Cladding Treatment
Piston rod surface is formed uniformly the deposited metals layer of 0.5 ~ 1.0mm thickness, and the hardness number of deposited metals layer is more than 52HRC, and molten
It is metallurgically combined between metal-clad and piston rod base material, the heat affected area width of deposited metals layer is less than 0.8mm.
Further surface reinforcing method according to the present invention, wherein in step 5, using Double Tops point installation way
After fixed piston rod, rough turn, smart car and fine grinding machining processes are carried out respectively.
Further surface reinforcing method according to the present invention wherein in step 6, is oozed using the coloring of 100% surface
Detection thoroughly（PT）, 100% Magnetic testing（MT）And/or 100% ultrasonic examination detection（UT）Piston rod after machining is carried out
Non-destructive testing must not have any linear discontinuities；Size detection is carried out to the piston rod after machining according to drawing and standard requirement,
So that the size of piston rod, tolerance and precision are met the requirements；Hardness determination meets the hardness number of the hardening region of piston rod requirement
For 52HRC ~ 58HRC.
Further surface reinforcing method according to the present invention, wherein laser melting coating qualification test step is further included,
The laser melting coating qualification test step is implemented before Laser Cladding Treatment described in step 3, is evaluated by the laser melting coating
Test procedure determines laser cladding of material, cladding parameter and the process conditions needed for Laser Cladding Treatment described in step 3.
Further surface reinforcing method according to the present invention, wherein the laser melting coating qualification test step is specific
For：Testing new process is carried out in advance to laser cladding of material, cladding parameter and the process conditions intending using, by cladding gold
The micro- metallographic structure of category, heat affected area and piston rod base material is analyzed and is evaluated, and measures each area's hardness number and its variation, and
The chemical composition of deposited metals layer is analyzed, is with the performance of deposited metals layer obtained under the corresponding Parameter Conditions of verification
It is no to disclosure satisfy that reinforcing requirement or reach optimum performance, and then determine laser cladding of material needed for Laser Cladding Treatment, melt
Cover parameter and process conditions.
Technical solution of the present invention has the following advantages that compared with the existing plating techniques such as hard chrome and thermal spraying：
1）The present invention proposes a kind of completely new based on laser melting coating innovative technology for natural gas reciprocating compressor piston rod
Laser melting and coating technique is applied at the surface peening of natural gas reciprocating compressor piston rod by method for surface hardening for the first time
Reason, and for surface Hardening Treatment innovative design laser cladding of material, the cladding parameter of natural gas reciprocating compressor piston rod
With cladding process, the surface peening of natural gas reciprocating compressor piston rod is efficiently solved the problems, such as, improve natural gas and back and forth press
Contracting machine piston rod performance and service life；
2）It is autolyzed that the present invention uses cladding alloy powder to have, and has good antioxygenic property and wetability, i.e.,
Make not select protective gas, still with excellent surface shaping characteristic；
3）Combination of the strengthening layer that the present invention is formed in piston rod surface between deposited metals layer, with piston rod matrix be
Metallurgical binding, bond strength is high, and deposited metals layer is not easily to fall off；
4）The hardness number of deposited metals of the present invention is up to 52HRC ~ 58HRC, higher than the hardness number of existing standard requirement
50HRC has excellent abrasive resistance and corrosion resistance；
5）Without carrying out preheating and rear heat treatment to piston rod matrix in the art production process of the present invention, and with automated production
Based on, the reliable in quality and stabilization of deposited metals；
6）The method of the invention can turn waste into wealth waste and old piston rod, restore its performance, meet National Industrial green
The development strategy of manufacture has wide popularizing application prospect.
Specific embodiment
Technical scheme of the present invention is described in detail below, so that those skilled in the art can more clearly
Understand the present invention, and the protection domain being not intended to limit the present invention.
Natural gas reciprocating compressor piston rod surface intensification technique method provided by the invention specifically includes following process step
Suddenly：
（1）Design and calculating：According to the maximum load that natural gas reciprocating compressor piston rod is born, the compression bar of piston rod is calculated
The minimum diameter size of stability, and design and plan to be formed in the thickness of the strengthening layer of piston rod surface, after which will be used as
Continuous cladding is formed in the thickness of the deposited metals layer of piston rod surface, preferably forms the deposited metals reinforcing in piston rod surface
The thickness of layer is 0.5 ~ 1.0mm；
（2）Laser melting coating qualification test：Procedure qualification is carried out to laser cladding of material, cladding parameter and the cladding process intending using
Experiment is specifically required according to relevant criterion and strengthening, select in the reasonable scope cladding material and corresponding cladding parameter with
Process conditions carry out laser melting coating experiment in advance, after the completion of experiment, by deposited metals, heat affected area（Heat affected area width
It is not had an impact less than 0.8mm and to substrate performance）Micro- metallographic structure with base material is analyzed and is evaluated, and measures each area
Hardness number and variation and the chemical composition of cladding layer is analyzed, with verification obtained under conditions of these parameters swash
Whether the performance of light deposited metals layer disclosure satisfy that design requirement or whether can reach optimal performance, more by being carried out to piston rod
Secondary laser melting coating qualification test is verified, is finally determined to meet piston rod surface reinforcing requirement or can reach best strengthen to want
Laser cladding of material, cladding parameter and the melting and coating process condition asked；
（3）Non-destructive testing before laser melting coating：100%PT or 100%MT non-destructive testings are carried out to the piston rod surface after turning, especially
It will be directed to the oil sealing of piston rod and the surface region of packing inter-working carries out 100%PT or 100%MT non-destructive testings, without any
Crackle is shown Ji Wei qualification；
（4）Laser melting coating operates：Laser Cladding Treatment is carried out to the surface to be fortified of the piston rod through non-destructive testing qualification.According to
Laser cladding of material, cladding parameter and the melting and coating process condition that laser melting coating qualification test determines are to the surface to be fortified of piston rod
Carry out Laser Cladding Treatment.Preferably the chemical composition of selected laser cladding powder powder material is（Weight percent forms）C：
0.1% ~ 0.2%, Si：≤ 0.8%, Mn：≤ 1.0%, Cr：17% ~ 19%, Ni：1.5 ~ 2.5%, remaining is Fe；Selected laser melts
Coating technique adds powder combination circular light spot using coaxial powder-feeding mode and carries out cladding, laser selection semiconductor coupling optical-fiber type
Laser, selected cladding parameter and process conditions are：2000 ~ 3500W of laser power, 8 ~ 10mm/s of sweep speed, cladding
Overlapping rate 40 ~ 50%, 15 ~ 22g/min of powder sending quantity, 1 layer of the number of clad layers or more, laser melting coating protective gas is using compressed air, nitrogen
Gas or argon gas.By Laser Cladding Treatment, uniform deposited metals layer is formed on the surface of piston rod as surface peening layer, it is excellent
The thickness of the deposited metals layer of choosing is 0.5 ~ 1.0mm, and the hardness number of deposited metals layer is more than 52HRC after tested；
（5）Non-destructive testing after laser melting coating：100% surface pigmentation and innltration test is carried out to the piston rod after laser melting coating
（PT）, Magnetic testing（MT）And/or 100% ultrasonic examination detection（UT）, must not have any crack defect, be weighed if defective
Multiple step（4）Or do rejecting processing；
（6）Machining：To the piston rod after laser melting coating lossless after testing, require to carry out according to the standard size of target requirement
Machining after piston rod is fixed using Double Tops point installation way during processing, carries out the processes such as rough turn, smart car and fine grinding respectively,
Complete machining；
（7）Final inspection, including detecting item as follows：
Non-destructive testing：Carry out 100% surface pigmentation and innltration test again to the piston rod surface after machining（PT）Or Magnetic testing
（MT）, must not there is any linear discontinuities；
Size detection：According to drawing and standard requirement, whether the size, tolerance and precision for detecting piston meet the requirements；
Hardness determination：The hardness of the surface peening deposited metals of the hardening region of piston rod requirement must not be less than 52HRC, preferably
The hardness number of the hardening region of piston rod requirement is 52HRC ~ 58HRC.
The method for surface hardening of natural gas reciprocating compressor piston rod provided by the invention, according to international or country's mark
Requirement of the standard for the wearability, corrosion resistance of the surface treatment of natural gas reciprocating compressor piston rod, selects matched increasing material
Material, the process that remanufactures of reasonable design solve the problems, such as that prior art surface Hardening Treatment exists, and has established
Whole piston rod surface reinforcement process technical method and appraisement system.Key technology of the present invention is strengthened using laser melting and coating technique
Piston rod surface, while the method for the invention can be used for remanufacturing for waste and old piston rod, the piston rod after remanufacturing
Every technical performance meets the performance requirement of former new product, and the method for the invention can be used for remanufacturing for waste and old piston rod,
Waste and old piston rod is turned waste into wealth, restores its performance, meets the development strategy of National Industrial green manufacturing, is had wide
Popularizing application prospect.
Obviously, the above embodiment is not of the invention just for the sake of illustrating examples of the invention with clearing
The restriction of implementation.For the technical staff in shown field, can also make on the basis of the above description it is other not
Change with form or change.There is no need and unable to be exhaustive to all embodiments.And these belong to the spirit of the present invention
The obvious changes or variations extended out are still in the protection scope of this invention.
Claims (10)
1. a kind of surface reinforcing method of natural gas reciprocating compressor piston rod, which is characterized in that include the following steps：
Step 1: determine that piston rod surface plans the thickness of surface peening layer to be formed；
Step 2: carried out non-destructive testing to piston rod surface, after testing without carrying out step 3 after any crack defect；
Step 3: Laser Cladding Treatment is carried out to piston rod surface, in the cladding of thickness described in piston rod surface forming step one
Metal layer is as surface peening layer；
Step 4: the piston rod surface after Laser Cladding Treatment is carried out non-destructive testing again, after testing without any crack defect
After carry out step 5；
Step 5: piston rod is required to be machined out according to target size；
Step 6: the piston rod after machining is carried out non-destructive testing, size detection and/or hardness determination.
2. surface reinforcing method according to claim 1, which is characterized in that wherein in step 1, held according to piston rod
The maximum load received calculates the minimum diameter size of piston rod strut stability, and based on maximum load and minimum diameter size
Determine to be formed in the thickness of the surface peening layer of piston rod surface.
3. surface reinforcing method according to claim 2, which is characterized in that is determined wherein in step 1 is formed in piston
The thickness of the surface peening layer on bar surface is 0.5 ~ 1.0mm.
4. surface reinforcing method according to claim 1, which is characterized in that wherein in step 2 and step 4, use
100% surface pigmentation and innltration test（PT）, 100% Magnetic testing（MT）And/or 100% ultrasonic examination detection（UT）To piston rod
Surface carries out non-destructive testing.
5. surface reinforcing method according to claim 1, which is characterized in that wherein in step 3, Laser Cladding Treatment is adopted
The chemical component weight percentage of laser cladding powder powder material forms：C：0.1% ~ 0.2%, Si：≤ 0.8%, Mn：≤
1.0%, Cr：17% ~ 19%, Ni：1.5 ~ 2.5%, remaining is Fe；Laser Cladding Treatment is added powder and is tied using coaxial powder-feeding mode
It closes circular light spot and carries out cladding, cladding laser is semiconductor coupling optical-fiber type laser；The cladding parameter of Laser Cladding Treatment
It is with process conditions：2000 ~ 3500W of laser power, 8 ~ 10mm/s of sweep speed, cladding overlapping rate 40 ~ 50%, powder sending quantity 15 ~
22g/min, 1 layer of the number of clad layers or more, cladding protective gas are compressed air, nitrogen or argon gas.
6. surface reinforcing method according to claim 1 or 5, which is characterized in that wherein in step 3, pass through laser melting coating
Processing is formed uniformly the deposited metals layer of 0.5 ~ 1.0mm thickness in piston rod surface, and the hardness number of deposited metals layer is more than
52HRC, and metallurgically combined between deposited metals layer and piston rod base material, the heat affected area width of deposited metals layer is less than
0.8mm。
7. surface reinforcing method according to claim 1, which is characterized in that wherein in step 5, using Double Tops point clamping
After mode fixed piston rod, rough turn, smart car and fine grinding machining processes are carried out respectively.
8. surface reinforcing method according to claim 1, which is characterized in that wherein in step 6, using 100% surface
Color Liquid penetrant testing（PT）, 100% Magnetic testing（MT）And/or 100% ultrasonic examination detection（UT）To the piston rod after machining
It carries out non-destructive testing, must not there is any linear discontinuities；Size is carried out to the piston rod after machining according to drawing and standard requirement
Detection, so that the size of piston rod, tolerance and precision are met the requirements；Hardness determination meets the hard of the hardening region of piston rod requirement
Angle value is 52HRC ~ 58HRC.
9. according to claim 1-8 any one of them surface reinforcing methods, which is characterized in that further include laser melting coating evaluation examination
Step is tested, the laser melting coating qualification test step is implemented before Laser Cladding Treatment described in step 3, passes through the laser
Cladding qualification test step determines laser cladding of material, cladding parameter and the technique item needed for Laser Cladding Treatment described in step 3
Part.
10. surface reinforcing method according to claim 9, which is characterized in that the laser melting coating qualification test step tool
Body is：Testing new process is carried out in advance to laser cladding of material, cladding parameter and the process conditions intending using, by cladding
The micro- metallographic structure of metal, heat affected area and piston rod base material is analyzed and is evaluated, and measures each area's hardness number and its variation,
And the chemical composition of deposited metals layer is analyzed, with the performance of deposited metals layer obtained under the corresponding Parameter Conditions of verification
Whether disclosure satisfy that reinforcing requirement or reach optimum performance, so determine laser cladding of material needed for Laser Cladding Treatment,
Cladding parameter and process conditions.
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| CN201810184028.3A CN108265290A (en) | 2018-03-06 | 2018-03-06 | A kind of surface reinforcing method of natural gas reciprocating compressor piston rod |
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| CN201810184028.3A CN108265290A (en) | 2018-03-06 | 2018-03-06 | A kind of surface reinforcing method of natural gas reciprocating compressor piston rod |
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| CN109930150A (en) * | 2019-03-14 | 2019-06-25 | 西安必盛激光科技有限公司 | A method of piston rod is processed using laser melting and coating technique |
| CN110257817A (en) * | 2019-01-19 | 2019-09-20 | 天津北基新激光科技有限公司 | The restorative procedure of roll bearing position |
| CN110257818A (en) * | 2019-01-19 | 2019-09-20 | 天津北基新激光科技有限公司 | The surface treatment method of Continuous Casting Rolls |
| CN110284136A (en) * | 2019-07-31 | 2019-09-27 | 天津玛斯特车身装备技术有限公司 | A kind of Press Tools for Automobiles laser remanufacturing processing method |
| CN110344048A (en) * | 2019-07-17 | 2019-10-18 | 株洲辉锐增材制造技术有限公司 | Laser cladding layer of high manganese steel frog and preparation method thereof and high manganese steel frog |
| CN110453213A (en) * | 2019-08-06 | 2019-11-15 | 国营芜湖机械厂 | A kind of aircraft 300M steel undercarriage piston rod lip crackle laser melting coating restorative procedure |
| CN113737172A (en) * | 2021-08-02 | 2021-12-03 | 广东工业大学 | Laser cladding method, laser cladding coating prepared by laser cladding method and application of laser cladding coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110257817A (en) * | 2019-01-19 | 2019-09-20 | 天津北基新激光科技有限公司 | The restorative procedure of roll bearing position |
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| CN110344048A (en) * | 2019-07-17 | 2019-10-18 | 株洲辉锐增材制造技术有限公司 | Laser cladding layer of high manganese steel frog and preparation method thereof and high manganese steel frog |
| CN110344048B (en) * | 2019-07-17 | 2021-06-22 | 株洲辉锐增材制造技术有限公司 | Laser cladding layer of high manganese steel frog, preparation method of laser cladding layer and high manganese steel frog |
| CN110284136A (en) * | 2019-07-31 | 2019-09-27 | 天津玛斯特车身装备技术有限公司 | A kind of Press Tools for Automobiles laser remanufacturing processing method |
| CN110453213A (en) * | 2019-08-06 | 2019-11-15 | 国营芜湖机械厂 | A kind of aircraft 300M steel undercarriage piston rod lip crackle laser melting coating restorative procedure |
| CN113737172A (en) * | 2021-08-02 | 2021-12-03 | 广东工业大学 | Laser cladding method, laser cladding coating prepared by laser cladding method and application of laser cladding coating |
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Application publication date: 20180710 |