CN102899660B - Method and nozzle improving laser cladding effect - Google Patents

Method and nozzle improving laser cladding effect Download PDF

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CN102899660B
CN102899660B CN 201210308815 CN201210308815A CN102899660B CN 102899660 B CN102899660 B CN 102899660B CN 201210308815 CN201210308815 CN 201210308815 CN 201210308815 A CN201210308815 A CN 201210308815A CN 102899660 B CN102899660 B CN 102899660B
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gas
passage
laser
end
head
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CN102899660A (en
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张翀昊
柳岸敏
黄佳欣
黄和芳
张祖洪
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张家港市和昊激光科技有限公司
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Abstract

本发明公开了一种提高激光熔覆效果的方法及喷头。 The present invention discloses a method for improving the effect of laser cladding and nozzle. 一种提高激光熔覆效果的方法,在激光熔覆时,在喷头的一条通道通入氦气和氮气的混合气体作为保护气体,在喷头的另一条通道同时通入高压氮气作为保护气体,混合气体的气压低于高压氮气的气压。 A method of increasing the effect of the laser cladding process, when laser cladding, in a channel head of the helium and nitrogen mixed gas as a shielding gas, in another passage of the nozzle while introducing high-pressure nitrogen gas as a shielding gas, mixed pressure gas is lower than the pressure of high-pressure nitrogen. 由于采用了上述技术方案,本发明一种提高激光熔覆效果的方法及喷头,通过使用不用化学成分、不同气压的保护气体,同时保护粉末流场与工作环境,可以极大提高熔覆质量;在喷头内部设计了多重保护气体通道,可在熔覆中使用多种不同成分、不同气压的保护气体,提高熔覆层质量,减少裂纹、缩松、缩孔,提高熔覆层致密性。 By adopting the technical solution of the present invention for improving the effect of a method of laser cladding and head, not by using the chemical composition of the protective gas of different pressure, powder flow field and while protecting the environment, can greatly improve the quality of the cladding; multiple internal nozzle design protection gas passage, a plurality of different components can be used in the cladding, protective gas different pressures, to improve the quality of the cladding layer, reduce cracking, shrinkage, shrinkage, improve the compactness of the cladding layer.

Description

一种提高激光熔覆效果的方法及喷头 A method for improving the effect of laser cladding and nozzle

技术领域 FIELD

[0001] 本发明涉及一种提高激光熔覆效果的方法及喷头,属于激光熔覆领域。 [0001] The present invention relates to an improved method and effect of the laser cladding head, belonging to the field of laser cladding.

背景技术 Background technique

[0002] 激光熔覆即高能激光表面熔覆,其物理过程为,在高能激光光束的照射下,基材表面被迅速融化,液态的金属形成一个小规模的熔池,在这个熔池中,原本的金属材料与被添加的粉末相互混合,形成一层新的液态金属层,待激光光束经过以后,熔池的温度降低,液态金属迅速冷却,在金属表面形成一层新的固态熔覆层。 [0002] The laser cladding i.e. high-energy laser surface cladding, which is a physical process, high-energy laser beam irradiation, the substrate surface is melted quickly, the liquid metal forms a small molten pool, in the bath, the original material is mixed with a metal powder is added to each other to form a new layer of the liquid metal layer, until after the laser beam passes through, the bath temperature decreases, the liquid metal rapidly cooled, forming a new layer on the metal surface of a solid cladding . 激光熔覆可极大的改变该关键部位的金属性能,如硬度、耐磨性、耐热性、抗腐蚀性等。 Laser cladding can greatly change the key parts of the metal properties, such as hardness, abrasion resistance, heat resistance, corrosion resistance and the like.

[0003] 为防止金属在高温下氧化,在熔覆喷头中设计保护气体通道,在进行激光熔覆的同时喷射保护气体,形成保护气体场以保护金属不被氧化。 [0003] In order to prevent oxidation of the metal at a high temperature in the cladding designed to protect the head gas passage, laser cladding is performed while ejecting shielding gas, shielding gas field is formed to protect the metal from oxidation. 现有技术中通常只使用氮气作为保护气体,虽具有一定的作用,但熔覆层表面不平滑,充满气孔,并由于表面张力不够,熔覆表面有塌陷现象。 The prior art typically only nitrogen as protective gas, although a certain effect, but the surface cladding layer is not smooth, full of pores, and not due to surface tension, the cladding surface collapse phenomenon. 发明内容 SUMMARY

[0004] 为了解决上述问题,本发明的目的在于提供一种用于一种提高激光熔覆效果的方法及喷头。 [0004] In order to solve the above problems, an object of the present invention to provide a method for laser cladding effect for improving the method and the head.

[0005] 为了达到以上目的,本发明采用的技术方案是:一种提高激光熔覆效果的方法,在激光熔覆时,在喷头的一条通道通入氦气和氮气的混合气体作为保护气体,在喷头的另一条通道同时通入高压氮气作为保护气体,混合气体的气压低于高压氮气的气压。 [0005] To achieve the above object, the technical solution adopted by the invention is: A method for improving the effect of laser cladding, laser cladding when, in a channel head of the helium and nitrogen mixed gas as a shielding gas, in another passage of the nozzle while introducing high-pressure nitrogen gas as a shielding gas, the mixed gas is lower than the pressure of high-pressure nitrogen gas pressure.

[0006] 优选地,混合气体中,氦气的体积占混合气体总体积的50%±5%。 [0006] Preferably, the mixed gas, the volume of helium gas accounting for 50% ± 5% of the total volume of the mixed gas.

[0007] 更优地,混合气体与高压氮气的体积比大于1:3。 [0007] More preferably, the volume of the high-pressure nitrogen gas mixture is greater than 1: 3.

[0008] 更优地,混合气体的气压为1.5~2个大气压,高压氮气的气压为3~5个大气压。 [0008] More preferably, the pressure of the mixed gas is 1.5 to 2 atmospheres, a high-pressure nitrogen gas pressure of 3-5 atm.

[0009] 本发明所提供的另一技术方案为:一种用于上述的提高激光熔覆效果的方法的喷头,它具有开设在该喷头中央的激光通道、开设在激光通道周围的一端与一种保护气体添加装置相连接另一端贯穿喷头底面的第一保护气体通道、开设在第一保护气体通道外围的一端与粉末添加装置相连接另一端贯穿喷头底面的粉末通道、开设在粉末通道外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头底面的第二保护气体通道。 [0009] Another aspect of the present invention provides for: sprayhead laser cladding process to improve the effect described above for the showerhead having a central opening in the laser channel, open at one end with a laser beam passage around Add shielding gas species other end is connected to the bottom surface of the head through a first protective gas passage opened to add another apparatus connected to the head end of the through passage at one end of the bottom surface of the powder with the powder of the first shielding gas passage periphery, the peripheral passage opening in the powder device another end of the protective gas addition device is connected to the other end of the bottom surface of the head through a second protective gas passage.

[0010] 优选地,第一保护气体通道的一端与混合气体添加装置相连接,第二保护气体通道与高压氮气添加装置相连接,混合气体为氦气和氮气的混合气体,其中氦气的体积占混合气体总体积的50%±5%。 [0010] Preferably, the end of the first shielding gas passage with the mixed gas addition device is connected, and a second shielding gas passage means is connected to the high-pressure nitrogen gas is added, the mixed gas is a mixture of helium and nitrogen, wherein the volume of helium accounting for 50% ± 5% of the total volume of the mixed gas.

[0011] 更优地,第一保护气体通道有多个,且绕激光通道的中心轴均匀分布;第二保护气体通道有多个,且绕激光通道的中心轴均匀分布。 [0011] More preferably, the channel has a first plurality of protective gas, and evenly distributed around the central axis of the laser channels; a second plurality of protective gas passage, and around the central axis of the laser channel evenly distributed.

[0012] 本发明还提供一技术方案:一种用于上述的提高激光熔覆效果的方法的喷头,它具有开设在该喷头中央的激光通道、开设在喷头上一端与一种保护气体添加装置相连接另一端激光通道相连通的第一保护气体入口、开设在激光通道周围的一端与粉末添加装置相连接另一端贯穿喷头底面的粉末通道、开设在粉末通道外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头底面的第二保护气体通道。 [0012] The present invention further provides a technical solution: A method for improving laser cladding nozzle effect described above for the showerhead having a central opening in the laser channel, defines one end of a protective gas is added in the nozzle means protective gas inlet is connected to a first end of the other laser channels communicating, open at one end to the powder addition means surrounding the laser channel is connected to the other end of the powder passage through the bottom surface of the nozzle, opening at one end of the periphery of the powder channel with another protective gas adding means connected to the other end of the bottom surface of the head through a second protective gas passage.

[0013] 优选地,第一保护气体入口的一端与混合气体添加装置相连接,第二保护气体通道与高压氮气添加装置相连接,混合气体为氦气和氮气的混合气体,其中氦气的体积占混合气体总体积的50%±5%。 [0013] Preferably, the first shielding gas inlet end with the mixed gas addition device is connected, and a second shielding gas passage means is connected to the high-pressure nitrogen gas is added, the mixed gas is a mixture of helium and nitrogen, wherein the volume of helium accounting for 50% ± 5% of the total volume of the mixed gas.

[0014] 更优地,第一保护气体入口与激光通道相连接处在竖直方向上距离喷头底面大于等于5cm。 [0014] More preferably, the first shielding gas inlet channel is connected to the laser in the vertical direction from the bottom surface of the head not less than 5cm.

[0015] 更优地,第一保护气体入口有多个,且绕激光通道的中心轴均匀分布;第二保护气体通道有多个,且绕激光通道的中心轴均匀分布。 [0015] More preferably, the first plurality of protective gas inlet, and evenly distributed around the central axis of the laser channels; a second plurality of protective gas passage, and around the central axis of the laser channel evenly distributed.

[0016] 由于采用了上述技术方案,本发明一种提高激光熔覆效果的方法及喷头,通过使用不用化学成分、不同气压的保护气体,同时保护粉末流场与工作环境,可以极大提高熔覆质量;在喷头内部设计了多重保护气体通道,可在熔覆中使用多种不同成分、不同气压的保护气体,提高熔覆层质量,减少裂纹、缩松、缩孔,提高熔覆层致密性。 [0016] By adopting the technical solution of the present invention for improving the effect of a method of laser cladding and head, not by using the chemical composition of the protective gas of different pressure, powder flow field and while protecting the environment, can greatly improve the melt coating quality; inside the head multiple protection gas passage is designed, using a variety of different components in the cladding, the protective gas of different pressure, improving the quality of the cladding layer, reduce cracking, shrinkage, shrinkage, improve densification cladding sex.

附图说明 BRIEF DESCRIPTION

[0017] 附图1为本发明实施例一中喷头的结构示意图; [0017] FIG 1 is a schematic structural diagram of a head in the embodiment of the invention;

[0018] 附图2为本发明实施例二中喷头的结构示意图。 [0018] FIG 2 is a schematic structure according to a second embodiment of the present invention in the head.

[0019]其中: [0019] wherein:

[0020] 1、喷头;2、激光通道;3、粉末通道;4、第一保护气体通道;5、第二保护气体通道; [0020] 1, the head; 2, laser channels; 3 powder channel; 4, a first protective gas passage; 5, the second shielding gas passage;

6、激光束;7、待熔覆加工件;8、熔覆层;9、第一保护气体入口。 6, the laser beam; 7, the workpiece to be clad; 8, the cladding layer; 9, a first shielding gas inlet.

具体实施方式 Detailed ways

[0021] 下面结合附图对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。 Detail drawings of the preferred embodiment of the present invention [0021] below with reference to enable features and advantages of the present invention can be more readily understood by those skilled in the art, in order to make more clear and unambiguous definition of the scope of the present invention .

[0022] 本实施例提供了一种提高激光熔覆效果的方法,在激光熔覆时,在激光熔覆时,在喷头的一条通道通入氦气和氮气的混合气体作为保护气体,在喷头的另一条通道同时通入高压氮气作为保护气体,混合气体和高压氮气同时从喷头中喷出。 [0022] The present embodiment provides a method of increasing the effect of laser cladding, laser cladding when, during the laser cladding, in a channel head of the helium and nitrogen mixed gas as a shielding gas in the showerhead another channels simultaneously into a high pressure nitrogen as protective gas, a mixed gas of nitrogen and high pressure discharged from the spray head at the same time. 混合气体的气压低于高压氮气的气压。 The pressure of the mixed gas is lower than the pressure of high-pressure nitrogen. 在本实施例中,混合气体的气压为1.5~2个大气压,高压氮气的气压为3~5个大气压。 In the present embodiment, a mixed gas pressure of 1.5 to 2 atmospheres, a high-pressure nitrogen gas pressure of 3-5 atm.

[0023] 氮气比较便宜,但只能防止氧化,而且抗氧化功能不如氦气。 [0023] The nitrogen is cheaper, but only to prevent oxidation, but not as antioxidant helium. 氦气不但能抗氧化,而且惰性更强,能防止金属粉末的其他反应,但是价格昂贵。 Helium is not only resistant to oxidation and more inert, can prevent other reactive metal powder, but expensive.

[0024] 氦气的保护性能比氮气强,但是经过对比发现,在氮气与氦气的混合气体中,若氦气的体积比在20%以上,这种混合气体的保护性能与纯氦气非常接近,经济性很强。 [0024] The protective properties of helium stronger than nitrogen, but after comparison, a mixed gas of nitrogen and helium, helium gas, if the volume ratio of 20% or more, the protective properties of such mixed gas is pure helium close to the economy strong.

[0025] 在本实施例中,混合气体中,氦气的体积占混合气体总体积的50%± 5%,混合气体与高压氮气的体积比大于1:3。 [0025] In the present embodiment, the mixed gas, the volume of helium gas accounting for 50% ± 5% of the total volume of the mixed gas, a mixed gas volume of the high pressure nitrogen is greater than 1: 3.

[0026] 本实施例所提供的另一技术方案为:一种用于上述提高激光熔覆效果的方法的喷头,如附图1所示,它具有开设在该喷头I中央的激光通道2、开设在激光通道2周围的一端与一种保护气体添加装置相连接另一端贯穿喷头I底面的第一保护气体通道4、开设在第一保护气体通道4外围的一端与粉末添加装置相连接另一端贯穿喷头I底面的粉末通道3、开设在粉末通道3外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头I底面的第二保护气体通道5。 [0026] Another aspect of embodiments of the present embodiment is provided: A spray head of the above method for improving the effect of laser cladding, as shown in FIG. 1, which has opened in the center of the laser head I channel 2, adding means open at one end to a protective gas around the channel 2 is connected to the other end of the laser head I through the bottom surface of a first protective gas passage 4, to open at the other end with the powder of the first shielding gas passage 4 is connected to the peripheral end of the addition means I through the bottom surface of the head 3 of the powder path, the open end of the protective gas is added with another protective gas is connected to a second end of the other passage 5 through the bottom surface of the showerhead apparatus 3 I periphery of the powder path.

[0027] 第一保护气体通道4有多个,且绕激光通道2的中心轴均匀分布;第二保护气体通道5有多个,且绕激光通道2的中心轴均匀分布。 [0027] The first shielding gas passage 4 has a plurality of uniformly distributed around the central axis 2 and the laser path; a second plurality of protective gas passage 5, and uniformly distributed around the central axis 2 of the laser channel.

[0028] 第一保护气体通道4的一端与混合气体添加装置相连接,混合气体在激光与粉末之间喷出,有助于增强粉末流场的均匀性,第二保护气体通道5与高压氮气添加装置相连接,高压氮气在粉末外围喷出,有助于增强粉末流场的集中性和集束性。 [0028] The end of the first shielding gas passage 4 with the mixed gas addition device is connected between the laser and a mixed gas ejection powder, the powder contributes to enhance the uniformity of flow field, the second shielding gas passage 5 and the high pressure nitrogen adding means connected to the periphery of the ejection powder in the high-pressure nitrogen, it helps to enhance concentration and bundling powder flow field. 混合气体为氦气和氮气的混合气体,其中氦气的体积占混合气体总体积的50%±5%。 The mixed gas is a mixed gas of helium and nitrogen, wherein the volume of helium gas accounting for 50% ± 5% of the total volume of the mixed gas. 需要说明的是,氦气和氮气可先进行混合,混合为混合气体后再通入第一保护气体通道4,也可将氦气和氮气分别通入第一保护气体通道4,两种气体从喷头喷出后进行混合。 Incidentally, helium and nitrogen can be mixed first, and then the mixed gas is mixed into the first protective gas passage 4 can also be helium and nitrogen were introduced into the first protective gas passage 4, two gases from mixing nozzle after discharge.

[0029] 每个第一保护气体通道4和第二保护气体通道5的气体入口处的尺寸大于气体出口处的尺寸,以增加气体从喷头喷射出时的压力。 [0029] The size of each of the first shielding gas passage 4 and the second protective gas at the gas inlet passage 5 is larger than the size of the gas at the outlet, to increase the pressure of the gas ejected from the nozzle.

[0030] 在多种保护气体覆盖下的熔覆层表面平滑,无孔洞与裂纹,表面张力足够,熔覆层中央收缩,符合熔覆高度要求。 [0030] surface of the cladding layer covering the plurality of protective gas a smooth, crack-free holes, sufficient surface tension, the central shrink cladding, cladding meet the height requirements.

[0031] 实施例二 [0031] Second Embodiment

[0032] 本实施例与实施例一的区别在于:一种用于上述的提高激光熔覆效果的方法的喷头,如附图2,它具有开设在该喷头I中央的激光通道2、开设在喷头I上一端与一种保护气体添加装置相连接另一端激光通道2相连通的第一保护气体入口9、开设在激光通道2周围的一端与粉末添加装置相连接另一端贯穿喷头I底面的粉末通道3、开设在粉末通道3外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头I底面的第二保护气体通道5。 [0032] The present embodiment differs from the embodiment in that a: sprayhead improving effect of the laser cladding process described above is used, as indicated by reference 2, having a central opening in the head of I-laser 2, in open One end of a protective gas addition device is connected to the laser head I channel 2 and the other end communicates to the first shielding gas inlet 9, open at one end to the powder around the powder passage added laser device 2 is connected to the other end penetrating the bottom head I channel 3, opened at one end to another connected to a second protective gas added protective gas passage 5 through the other end of the bottom surface of the showerhead apparatus 3 I powder peripheral channel.

[0033] 第一保护气体入口9的一端与混合气体添加装置相连接,第二保护气体通道5与高压氮气添加装置相连接。 [0033] a first protective-gas inlet end 9 is connected with the mixed gas adding means and a second shielding gas passage 5 is connected to the high-pressure nitrogen gas metering device.

[0034] 第一保护气体入口9与激光通道2相连接处在竖直方向上距离喷头I底面大于等于5cm,以保证保护气体从中央通道喷出前在其内形成风向稳定的流动风,进而确保粉末不被冲进中央通道,同时也可保证保护气体从中央通道喷射出后与粉末充分混合。 [0034] a first protective-gas inlet 9 is connected to the laser channel 2 in the vertical direction is larger than a distance equal to the bottom surface of the head I 5cm, to ensure stable shielding gas flow direction before the discharge air from a central channel therein, and then to ensure that the powder will not be rushed into the central channel, but also to ensure the powder was thoroughly mixed with the protective gas is injected from a central channel.

[0035] 第一保护气体入口9有多个,且绕激光通道2的中心轴均匀分布;第二保护气体通道5有多个,且绕激光通道2的中心轴均匀分布。 [0035] a first protective-gas inlet 9 with a plurality of, and uniformly distributed around the central axis of the laser channel 2; a second plurality of protective gas passage 5, and uniformly distributed around the central axis of the laser channel 2.

[0036] 上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。 [0036] The embodiment for explaining the technical concept and features of the invention, its object is to only allow those skilled in the art to understand the present invention and according to embodiments, and not limit the scope of this invention. 凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。 Where an equivalent changes or modifications made from the spirit of the present invention, shall fall within the scope of the present invention.

Claims (3)

1.一种提高激光熔覆效果的方法,其特征在于:在激光熔覆时,在喷头的一条通道通入氦气和氮气的混合气体作为保护气体,在喷头的另一条通道同时通入高压氮气作为保护气体,所述混合气体的气压低于高压氮气的气压,所述的混合气体中,氦气的体积占混合气体总体积的20%,所述的混合气体与高压氮气的体积比大于1:3,所述混合气体的气压为1.5~2个大气压,所述高压氮气的气压为3~5个大气压。 1. A method of increasing the effect of the laser cladding process, wherein: during the laser cladding, in a channel head of a gas mixture of helium and nitrogen as the protective gas, while passing a high-pressure nozzle in another passage nitrogen as protective gas, the pressure of the mixed gas is lower than the pressure of the high pressure nitrogen gas, the mixed gas, the volume of helium 20% of the total volume of the mixed gas, a mixed gas volume of the high-pressure nitrogen gas is greater than 1: 3, the pressure of the mixed gas is 1.5 to 2 atmospheres, the pressure of the high pressure nitrogen is 3-5 atmospheres.
2.一种用于权利要求1所述的提高激光熔覆效果的方法的喷头,其特征在于:它具有开设在该喷头(I)中央的激光通道(2)、开设在所述激光通道(2)周围的一端与一种保护气体添加装置相连接另一端贯穿喷头(I)底面的第一保护气体通道(4)、开设在所述第一保护气体通道(4 )外围的一端与粉末添加装置相连接另一端贯穿所述喷头(I)底面的粉末通道(3)、开设在所述粉末通道(3)外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头(I)底面的第二保护气体通道(5),所述的第一保护气体通道(4)的一端与混合气体添加装置相连接,所述的第二保护气体通道(5)与高压氮气添加装置相连接,所述的混合气体为氦气和氮气的混合气体,其中氦气的体积占混合气体总体积的20%,所述的第一保护气体通道(4)有多个,且绕激光通道(2)的中心轴均匀分布;所述的第二保护气体通 2. A head as claimed in claim 1, the method of improving the effect of laser cladding, characterized in that: it has opened in the head (I) of the central passage of the laser (2), the laser light passage opening ( 2) is connected with a protective gas around the adding means is connected to the other end through the head (I) of the bottom surface of the first shielding gas passage (4), open at one end to add the powder (4) of the periphery of the first shielding gas passage means connected to the other end extending through the head (I) of the bottom surface of the powder channel (3), open at one end and another protective gas is added through the other end connected to a bottom surface of the head (I) of the powder passage means (3) periphery a second protective gas passage (5), a first end of the protective gas passage (4) with the mixed gas addition device is connected to said second shielding gas passage (5) adding means is connected to high-pressure nitrogen, the mixed gas is a mixed gas of helium and nitrogen, wherein the volume of helium gas accounting for 20% of the total volume of the mixed gas, the first shielding gas passage (4) has a plurality, and the passage around the laser (2) uniformly distributed central axis; protective gas through said second (5)有多个,且绕激光通道(2)的中心轴均匀分布。 (5) a plurality of, and uniformly distributed around the passage of the laser (2) center axis.
3.一种用于权利要求1所述的提高激光熔覆效果的方法的喷头,其特征在于:它具有开设在该喷头(I)中央的激光通道(2)、开设在所述喷头(I)上一端与一种保护气体添加装置相连接另一端所述激光通道(2)相连通的第一保护气体入口(9)、开设在所述激光通道(2 )周围的一端与粉末添加装置相连接另一端贯穿所述喷头(I)底面的粉末通道(3 )、开设在所述粉末通道(3)外围的一端与另一种保护气体添加装置相连接另一端贯穿喷头(I)底面的第二保护气体通道(5),所述的第一保护气体入口(9)的一端与混合气体添加装置相连接,所述的第二保护气体通道(5)与高压氮气添加装置相连接,所述的混合气体为氦气和氮气的混合气体,其中氦气的体积占混合气体总体积的20%,所述的第一保护气体入口(9)与激光通道(2 )相连接处在竖直方向上距离喷头(I)底面大于等于5cm。 3. A spray head as claimed in claim 1, the method of improving the effect of laser cladding, characterized in that: it has opened in the head (I) of the central passage of the laser (2), that opens in the head (I one end) with a protective gas metering device connected to the other end of the laser channel (2) connected through a first protective gas inlet (9), defines one end of the device relative to the surrounding powder is added in the laser channel (2) the other end extending through the head (I) the powder channel (3) of the bottom surface, with another opening at one end is connected to the protective gas is added through the other end of the head (I) of the bottom surface of the powder passage means (3) periphery two protective gas passage (5), a first end of the protective gas inlet (9) and mixing the gas addition device is connected to said second shielding gas passage (5) was added and the apparatus is connected to a high-pressure nitrogen gas, the the mixed gas is a mixed gas of helium and nitrogen, wherein the volume of helium 20% of the total volume of the mixed gas, a first protective-gas inlet (9) of the laser channel (2) is connected in said vertical direction nozzle distance (I) is equal to the bottom surface is greater than 5cm.
CN 201210308815 2012-08-28 2012-08-28 Method and nozzle improving laser cladding effect CN102899660B (en)

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