CN103921013A - Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method - Google Patents
Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method Download PDFInfo
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- CN103921013A CN103921013A CN201410191947.5A CN201410191947A CN103921013A CN 103921013 A CN103921013 A CN 103921013A CN 201410191947 A CN201410191947 A CN 201410191947A CN 103921013 A CN103921013 A CN 103921013A
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- Prior art keywords
- welding wire
- hook
- cobalt
- connecting rod
- overlaying
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Classifications
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3046—Co as the principal constituent
-
- 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
- B23K5/00—Gas flame welding
- B23K5/006—Gas flame welding specially adapted for particular articles or work
-
- 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
- B23K5/00—Gas flame welding
- B23K5/18—Gas flame welding for purposes other than joining parts, e.g. built-up welding
-
- 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
- B23K5/00—Gas flame welding
- B23K5/213—Preliminary treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
Abstract
The invention discloses a cobalt-base alloy welding wire, a hook claw using the welding wire, a connection rod and a surfacing method. The cobalt-base alloy welding wire comprises chemical components including, by mass, 0.9-1.05% of C, 26.0-32.0% of Cr, 3.0-6.0% of W, less than or equal to 3.0% of Ni, less than or equal to 1.0% of Mo, less than or equal to 1.0% of Mn, less than or equal to 2.0% of Si, less than or equal to 3.0% of Fe, and the balance Co. By controlling the content of C, deposited metal meets the requirements of hardness and nondestructive testing.
Description
Technical field
The invention belongs to field of welding material, particularly, relate to a kind of cobalt-base alloy welding wire, apply hook, connecting rod and the overlaying method of this welding wire.
Background technology
Hook and connecting rod are that CRDM moves main execution part and wearing part, thereby effect is after engaging with drive rod annular groove by the hook flank of tooth, to drive drive rod rising and descending motion to drive reactor control rod to move up and down to reach the object that regulates reactor capability and in emergency circumstances shutdown.Due to the constantly wearing and tearing in running of the hook flank of tooth, with the contact-making surface of drive rod annular groove can be fewer and feweri, in the time that wearing and tearing reach capacity situation, hook can not effectively engage and will produce step-out or skidding with drive rod, and the life-span of driving mechanism has reached the limit.Under working condition, there is larger frictional force and impulsive force with bearing pin in the aperture that adds two φ 9.5 of hook and connecting rod, aperture can deform in the course of the work, thereby the inaccurate wearing and tearing that aggravate the hook flank of tooth in the location that causes hook, shorten life-span of hook and connecting rod greatly.Therefore just the quality of hook and connecting rod is had higher requirement.
Based on above requirement, conventionally at aperture and flank of tooth position built-up welding cobalt-base alloys to increase hardness and the wearability of its mating surface.
For the built-up welding of CRDM hook and connecting rod, more domestic relevant units have carried out repeatedly research of technique project verification during the last ten years, also can produce certified products, but all do not have practical engineering application to be worth because technology stability is poor, yield rate is too low, mainly have following problem: hardness and Non-Destructive Testing are defective.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of hardness and qualified cobalt-base alloy welding wire of Non-Destructive Testing that makes hook and connecting rod overlaying surface.
In addition, the present invention is also necessary to provide a kind of hook and connecting rod of applying above-mentioned cobalt-base alloy welding wire built-up welding.
Separately, the present invention is also necessary to provide a kind of overlaying method of applying above-mentioned cobalt-base alloy welding wire.
The present invention addresses the above problem adopted technical scheme: a kind of cobalt-base alloy welding wire is provided, and its chemical composition and quality percentage composition are:
C:0.94-1.05%, Cr:26.0-32.0%, W:3.0-6.0%, Ni :≤3.0%, Mo :≤1.0%, Mn :≤1.0%, Si :≤2.0%, Fe :≤3.0%, surplus is Co.
Wherein, the preferred 0.95-1.0% of quality percentage composition of described C.
Wherein, the preferred 28.0-30.0% of quality percentage composition of described Cr.
Wherein, the preferred 4.0-6.0% of quality percentage composition of described W.
The content of controlling C in the present invention is mainly to ensure the intensity of weld seam, and makes the hardness of overlaying surface and the Non-Destructive Testing all can be qualified.In the cobalt-base alloy welding wire of available technology adopting, the mass percent of C is 0.9-1.4%, use hardness and the Non-Destructive Testing of goods (as hook, connecting rod etc.) of this welding wire built-up welding uncontrollable, mainly: 1. in this welding wire, the content distribution of C is wider, easily cause the unstable of C constituent content in deposited metal, different regions is because the difference of C content has caused the inhomogeneous of hardness, and regional area causes hardness higher because C content is high; 2.C content is high except can improving the hardness of deposited metal, in welding wire C and Co at high temperature the compound of Formed and cobalt (as Co
3c, Co
2c etc.) probability also improved, and different with carbon content of the compound of this carbon and cobalt, firmness change is obvious, causes hardness inhomogeneous, and the compound of described carbon and cobalt is also unfavorable for the floating of slag, thereby it is defective easily to cause occurring that slag inclusion affects the Non-Destructive Testing of built-up welding goods.Adopt the welding wire of C content of the present invention can address the above problem significantly.
Cobalt-base alloy welding wire of the present invention can effectively be controlled at HRC39-HRC47 by the hardness of deposited metal.
A kind of goods of applying above-mentioned cobalt-base alloy welding wire built-up welding.More specifically, as apply hook, the connecting rod etc. of above-mentioned cobalt-base alloy welding wire built-up welding.
An overlaying method of applying above-mentioned cobalt-base alloy welding wire, comprises the following steps:
Pre-treatment step: the goods before built-up welding are carried out to pretreatment;
Preheating step: pretreated goods are carried out to preheating;
Built-up welding step: adopt oxy-acetylene flame weldering, and to regulate gas welding flame be carburizing flame, the overlaying surface for the treatment of of goods is heated; When described goods in the time there is wetting phenomena in overlaying surface, described cobalt-base alloy welding wire is inserted in described gas welding flame, after fusing, splash into and be the treating in overlaying surface of wetting state;
Post-processing step: the goods through above-mentioned built-up welding step are carried out to post processing.
Wherein, described goods are hook or connecting rod.
Wherein, described connecting rod is 00Cr18Ni10N Austenitic stainless steel, and the overlaying surface for the treatment of of described connecting rod is processed at the pin-and-hole position of described connecting rod.
Wherein, described hook is that 00Cr18Ni10N austenitic stainless steel is forged rod, and the overlaying surface for the treatment of of described hook is processed at the flank of tooth position of described hook and pin-and-hole position.
Wherein, in described preheating step, the preheat temperature of described hook or described connecting rod is higher than 260 DEG C.
Wherein, the diameter of described cobalt-base alloy welding wire is 2.7mm.
Wherein, the internal flame length in described carburizing flame be inner cone length 2-2.5 doubly.
Wherein, described pre-treatment step and described post-processing step are all not particularly limited, and according to welding procedure specification (WPS) of the prior art operation, particularly, described pre-treatment step comprises: remove burr, treat overlaying surface described in cleaning.Described post-processing step comprises: hook or the connecting rod of heap postwelding are put into heat-treatment furnace, and remain on Slow cooling after the lower scheduled time of temperature identical with preheat temperature.
In sum, the invention has the beneficial effects as follows: apply the cobalt-base alloy welding wire of composition of the present invention and content thereof, built-up welding goods can meet the requirement of hardness and Non-Destructive Testing.
Brief description of the drawings
Fig. 1 is the structural representation of hook built-up welding;
Fig. 2 is the B-B cross-sectional schematic in Fig. 1;
Fig. 3 is the structural representation of connecting rod built-up welding;
Fig. 4 is the B-B cross-sectional schematic in Figure 31;
Fig. 5 is the structural representation of carburizing flame;
Wherein, 20 is hook, and 21 is the overlay cladding of the hook flank of tooth, and 22 is hook pin-and-hole, and 23 is the overlay cladding of hook pin-and-hole, and 10 is connecting rod, and 11 is connecting rod pin-and-hole, and 12 is the overlay cladding of connecting rod pin-and-hole, and A is torch-tip, and B is inner cone, and C is internal flame, and D is flame envelope.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is done to detailed description further, but embodiments of the present invention are not limited to this.
Embodiment 1-3
Adopt cobalt-base alloy welding wire as shown in table 1, in this welding wire, the quality percentage composition sum of each composition is 100%, diameter phi 2.7mm.
Table 1 cobalt-base alloy welding wire chemical composition (Wt%)
The mother metal of hook and connecting rod all adopts 00Cr18Ni10N Austenitic stainless steel.
Pretreatment: before built-up welding, eliminating the burr for the treatment of overlaying surface of hook and connecting rod and other may affect the defect of surfacing quality, the clean overlaying surface for the treatment of.
Preheating: hook and the connecting rod for the treatment of built-up welding are carried out to preheating, and preheat temperature is higher than 260 DEG C.
The built-up welding of the hook flank of tooth: adopt oxy-acetylene flame weldering, as shown in Figure 5, and igniting, adjusting flame is carburizing flame, the length adjustment of internal flame L2 is 2-2.5 times of inner cone L1.The flank of tooth to described hook heats, and in the time that wetting phenomena appears in the flank of tooth of described hook, described cobalt-base alloy welding wire is inserted in described gas welding flame, splashes into and be the treating in overlaying surface of wetting state after fusing.
Post processing: after the built-up welding of the hook flank of tooth completes, described hook is put into heat-treatment furnace Slow cooling, and remain on the temperature lower scheduled time identical with preheat temperature, as 10-20 minute.
After the built-up welding of the hook flank of tooth completes, repeat the pin-and-hole position of aforesaid operations step built-up welding hook and the pin-and-hole position of connecting rod, and the pin-and-hole of maintenance heap postwelding is still through hole.
Fig. 1-4 are shown in by the schematic diagram of hook and connecting rod heap postwelding.After completing, hook and connecting rod built-up welding carry out hardness test, described hardness test adopts RCC-M MC1282 standard to test, on the burnishing surface of overlay cladding, measure at least 10 HRC hardness numbers, measurement point should be distributed on overlay cladding surface, and test result is recorded in to following table 2.
After hardness test, carry out machined by technique, after product machines, carry out surface infiltration by RCC-M MC4000 standard and detect, do not find that there are slag inclusion, defects i.e.cracks in deposited metal surface.
Table 2 welding wire deposited metal hardness
Comparative example 1-3
Adopt mode built-up welding hook and the connecting rod identical with embodiment 1, difference is: comparative example 1-3 adopts the cobalt-base alloy welding wire of composition as shown in table 3, and in welding wire, the quality percentage composition sum of each composition is 100%.
Table 3 cobalt-base alloy welding wire chemical composition (Wt%)
After completing, hook and connecting rod built-up welding carry out hardness test, described hardness test adopts RCC-M MC1282 standard to test, on the burnishing surface of overlay cladding, measure at least 10 HRC hardness numbers, measurement point should be distributed on overlay cladding surface, and test result is recorded in to following table 4.
After hardness test, carry out machined by technique, after product machines, carry out surface infiltration by RCC-M MC4000 standard and detect, find that there is dreg defect on deposited metal surface.
Table 4 welding wire deposited metal hardness
Be HRC39-HRC47 for the hardness requirement of cobalt-base alloy welding wire deposited metal at present, and the difference of maximum and minimum of a value must not exceed HRC5.
Can find out by table 2 and the welding wire deposited metal hardness test value of table 4, the deposited metal hardness of the cobalt-base alloy welding wire of composition of the present invention is between HRC39-HRC47, be more preferably 41.5-44.2, the difference of the maximum hardness of each overlaying surface and hardness minimum of a value is no more than HRC5, even do not exceed HRC3.6, meet its hardness requirement.
Through test repeatedly, inventor finds that the deposited metal carbon element content of built-up welding has increased about 0.2%-0.3% than bare wire, this just flame when explanation welding to the carbon that has oozed about 0.2%-0.3% in deposited metal.The carbon content that inventor finds deposited metal through test of many times is simultaneously in the time of 1.1%-1.3%, and its hardness range is obviously stabilized in the scope of HRC39-HRC47.Thus, inventor proposes the carbon element content in stricter control welding wire, controls the hardness number of deposited metal with this.Through welding wire chemical composition and the quality percentage composition of repeatedly proving after improvement be: C:0.94-1.05%, Cr:26.0-32.0%, W:3.0-6.0%, Ni :≤3.0%, Mo :≤1.0%, Mn :≤1.0%, Si :≤2.0%, Fe :≤3.0%, surplus is Co.When built-up welding, regulating inner cone and internal flame ratio is 1:(2-2.5) time, the qualification rate of hook and connecting rod significantly improves, and reaches more than 90%.
The mass percent of the C adopting in comparative example is higher than 1.05%, in weld deposit process, cobalt-base alloy welding wire melts and splashes into molten bath under the effect of oxy-acetylene flame, and liquid weld pool surface forms one deck oxidizing slag, and on the other hand, in welding wire C and Co at high temperature the compound of Formed and cobalt (as Co
3c, Co
2c etc.) probability also improved, the compound of this carbon and cobalt is unfavorable for the floating of oxidizing slag, therefore, in welding process in layer, oxidizing slag has not been crushed on and has formed between layers slag inclusion with molten bath floating, has caused Non-Destructive Testing defective.Effective head it off of the cobalt-base alloy welding wire that adopts scope of the present invention.
In sum, cobalt-base alloy welding wire tool of the present invention has the following advantages: 1. the hardness of effectively having controlled deposited metal is that the difference of HRC39-HRC47 and maximum hardness and minimum of a value is within the scope of HRC5, ensure the stable and uniformity of weldquality, improved the qualification rate of product; 2. reduce the slag in weld seam, effectively ensure efficiency and the quality of welding job.
As mentioned above, can realize preferably the present invention.
Claims (10)
1. a cobalt-base alloy welding wire, its chemical composition and quality percentage composition are:
C:0.94-1.05%, Cr:26.0-32.0%, W:3.0-6.0%, Ni :≤3.0%, Mo :≤1.0%, Mn :≤1.0%, Si :≤2.0%, Fe :≤3.0%, surplus is Co.
2. cobalt-base alloy welding wire according to claim 1, is characterized in that, the quality percentage composition of described C is 0.95-1.0%.
3. hook or the connecting rod of an application cobalt-base alloy welding wire built-up welding as claimed in claim 1 or 2.
4. an overlaying method for application cobalt-base alloy welding wire as claimed in claim 1 or 2, comprises the following steps:
Pre-treatment step: the goods before built-up welding are carried out to pretreatment;
Preheating step: pretreated goods are carried out to preheating;
Built-up welding step: adopt oxy-acetylene flame weldering, and to regulate gas welding flame be carburizing flame, the overlaying surface for the treatment of of goods is heated; When described goods in the time there is wetting phenomena in overlaying surface, described cobalt-base alloy welding wire is inserted in described gas welding flame, after fusing, splash into and be the treating in overlaying surface of wetting state;
Post-processing step: the goods through above-mentioned built-up welding step are carried out to post processing.
5. overlaying method according to claim 4, is characterized in that, described goods are hook or connecting rod.
6. overlaying method according to claim 5, is characterized in that, described connecting rod is 00Cr18Ni10N Austenitic stainless steel, and the overlaying surface for the treatment of of described connecting rod is processed at the pin-and-hole position of described connecting rod.
7. overlaying method according to claim 5, is characterized in that, described hook is that 00Cr18Ni10N austenitic stainless steel is forged rod, and the overlaying surface for the treatment of of described hook is processed at the flank of tooth position of described hook and pin-and-hole position.
8. overlaying method according to claim 4, is characterized in that, the internal flame length in described carburizing flame be inner cone length 2-2.5 doubly.
9. overlaying method according to claim 5, is characterized in that, in described preheating step, the preheat temperature of described hook or described connecting rod is higher than 260 DEG C.
10. overlaying method according to claim 5, is characterized in that, described pre-treatment step comprises: remove and treat the burr of overlaying surface, the clean overlaying surface for the treatment of; Described post-processing step comprises: hook or the connecting rod of heap postwelding are put into heat-treatment furnace, and remain on after the temperature lower scheduled time identical with preheat temperature cooling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410191947.5A CN103921013A (en) | 2014-05-07 | 2014-05-07 | Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method |
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| CN201410191947.5A CN103921013A (en) | 2014-05-07 | 2014-05-07 | Cobalt-base alloy welding wire, hook claw using welding wire, connection rod and surfacing method |
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| CN104637552A (en) * | 2015-01-09 | 2015-05-20 | 李泽文 | Reactor claw-link mechanism and manufacturing method thereof |
| CN104751921A (en) * | 2015-03-24 | 2015-07-01 | 四川华都核设备制造有限公司 | Claw assembly with long service life and production process thereof |
| CN105171186A (en) * | 2015-07-31 | 2015-12-23 | 武汉船用机械有限责任公司 | Welding method for conducting build up welding through stellite alloy |
| CN105221190A (en) * | 2015-09-11 | 2016-01-06 | 杭州汽轮机股份有限公司 | Steam turbine high temperature sleeves and manufacture method thereof |
| CN107217215A (en) * | 2017-05-26 | 2017-09-29 | 黄曦雨 | Austenitic stainless steel and its application and bead-welding technology |
| CN107322183A (en) * | 2017-08-19 | 2017-11-07 | 安徽鼎恒再制造产业技术研究院有限公司 | A kind of turbine blade built-up welding continuous casting casting rod and its welding procedure |
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| CN108062983A (en) * | 2018-01-17 | 2018-05-22 | 上海核工程研究设计院有限公司 | A kind of nuclear power station control rod drive mechanism hook of increasing material manufacturing |
| CN113275788A (en) * | 2021-05-19 | 2021-08-20 | 中国科学院金属研究所 | Alloy welding wire for welding high-wear-resistance cobalt-based composite material and preparation method and application thereof |
| CN113930652A (en) * | 2021-09-26 | 2022-01-14 | 西安理工大学 | Cobalt-based welding wire for laser cladding and preparation method thereof |
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