CN109454315B - Multi-tungsten electrode argon arc heat source, control method and welding device - Google Patents
Multi-tungsten electrode argon arc heat source, control method and welding device Download PDFInfo
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- 239000010937 tungsten Substances 0.000 title claims abstract description 142
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 142
- 238000003466 welding Methods 0.000 title claims abstract description 82
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000010953 base metal Substances 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims abstract 3
- NGONBPOYDYSZDR-UHFFFAOYSA-N [Ar].[W] Chemical compound [Ar].[W] NGONBPOYDYSZDR-UHFFFAOYSA-N 0.000 claims description 11
- 238000010891 electric arc Methods 0.000 claims 1
- 239000012895 dilution Substances 0.000 abstract description 8
- 238000010790 dilution Methods 0.000 abstract description 8
- 230000008021 deposition Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 238000000151 deposition Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
- B23K9/1675—Arc welding or cutting making use of shielding gas and of a non-consumable electrode making use of several electrodes
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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
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1087—Arc welding using remote control
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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
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Abstract
Description
技术领域technical field
本发明涉及一种钨极氩弧堆焊的热源,特别涉及一种多钨极氩弧热源、控制方法及焊接装置,属于堆焊技术领域。The invention relates to a heat source for tungsten argon arc surfacing, in particular to a multi-tungsten argon arc heat source, a control method and a welding device, and belongs to the technical field of surfacing.
背景技术Background technique
堆焊是将具有一定性能的材料堆敷在焊件表面上,在焊件表面获得耐磨、耐热等特殊性能的熔敷金属层的工艺。堆焊可显著提高焊件的使用寿命,节省制造及维修费用,缩短修理时间,从而提高生产率,因此广泛地应用于各行各业的制造和维修工作中。Surfacing welding is a process of depositing materials with certain properties on the surface of the weldment to obtain a deposited metal layer with special properties such as wear resistance and heat resistance on the surface of the weldment. Surfacing welding can significantly improve the service life of weldments, save manufacturing and maintenance costs, shorten repair time, and thus improve productivity, so it is widely used in manufacturing and maintenance work in all walks of life.
钨极氩弧堆焊具有电弧稳定、飞溅少、可见度好,堆焊层形状容易控制等诸多优点,但为了保证低稀释率,电弧能量较小,因此熔敷速度不高,目前只适用于堆焊质量要求高而形状复杂的小工件。Tungsten argon arc surfacing has many advantages such as stable arc, less spatter, good visibility, and easy control of the shape of the surfacing layer. However, in order to ensure a low dilution rate, the arc energy is small, so the deposition speed is not high. Small workpieces with high welding quality requirements and complex shapes.
发明内容SUMMARY OF THE INVENTION
针对现有钨极氩弧堆焊过程中为保证低的稀释率使得熔敷速度较低的问题,本发明提供一种多钨极氩弧热源、控制方法及焊接装置。Aiming at the problem of ensuring a low dilution rate and a low deposition rate in the existing argon tungsten arc surfacing process, the present invention provides a multi-tungsten argon arc heat source, a control method and a welding device.
一种多钨极氩弧热源,所述热源包括N个焊接电源、N个切换开关、M个钨极和氩保护气;N、M均取大于等于3的正整数;A multi-tungsten argon arc heat source, the heat source comprises N welding power sources, N switching switches, M tungsten electrodes and argon shielding gas; N and M are both positive integers greater than or equal to 3;
每个焊接电源的负极连接一个或多个钨极,M个钨极的端面排列成线形或面形,相邻两个钨极的间距能够保证电弧传递,相邻三个钨极分别连接不同的焊接电源;M个钨极位于母材的上方;The negative electrode of each welding power source is connected to one or more tungsten electrodes. The end faces of the M tungsten electrodes are arranged in a line or plane shape. The distance between two adjacent tungsten electrodes can ensure arc transmission. Three adjacent tungsten electrodes are respectively connected to different Welding power source; M tungsten electrodes are located above the base metal;
每个焊接电源的正极通过一个切换开关连接母材;氩保护气分布在钨极与母材之间。The positive pole of each welding power source is connected to the base metal through a switch; the argon shielding gas is distributed between the tungsten electrode and the base metal.
优选的是,所述切换开关具有设定频率的通断、且能通过百安培数量级的电流。Preferably, the switch has on-off at a set frequency and can pass a current of the order of hundreds of amperes.
优选的是,焊接电源具有陡特性。Preferably, the welding power source has steep characteristics.
本发明还提供一种热源控制方法,包括:The present invention also provides a heat source control method, comprising:
通过切换开关的控制,使电弧在M个钨极中切换,任意时刻只有一个电弧在燃烧,获得线形热源或面形热源。Through the control of the switch, the arc is switched among M tungsten electrodes, and only one arc is burning at any time, obtaining a linear heat source or a surface heat source.
本发明还提供一种焊接装置,所述装置包括所述的热源和焊炬;The present invention also provides a welding device, which includes the heat source and the welding torch;
所述热源的M个钨极同时设置在焊炬内。The M tungsten electrodes of the heat source are simultaneously arranged in the welding torch.
本发明的有益效果,本发明为一种以钨极氩弧为基础的热源,采用多个钨电极来实施,可以形成线热源或面热源。本发明的优点是采用多个钨极,最少用三个电源即可实现,电弧在多个钨极之间切换,任意时刻只有一个电弧在燃烧,因此对每个钨极而言,只有很少一部分时间燃弧,其余时间钨极冷却,钨极的电流承载能力将大大提高,可大幅度提高电弧能量。因为热源是线热源或面热源,所以对母材而言电弧的能量密度并不增加,因此可在保证稀释率的同时提高熔敷率,解决钨极氩弧堆焊的低熔敷率问题。The beneficial effects of the present invention are that the present invention is a heat source based on a tungsten argon arc, and is implemented by using a plurality of tungsten electrodes, which can form a line heat source or a surface heat source. The advantage of the invention is that multiple tungsten electrodes are used, which can be realized with at least three power sources, the arc is switched between multiple tungsten electrodes, and only one arc is burning at any time, so for each tungsten electrode, there are only a few Part of the time arcing, and the rest of the time the tungsten electrode is cooled, the current carrying capacity of the tungsten electrode will be greatly improved, and the arc energy can be greatly increased. Because the heat source is a line heat source or a surface heat source, the energy density of the arc does not increase for the base metal, so it can increase the deposition rate while ensuring the dilution rate, and solve the problem of low deposition rate in argon tungsten arc surfacing.
附图说明Description of drawings
图1为本发明的多钨极氩弧热源的原理示意图;Fig. 1 is the principle schematic diagram of the multi-tungsten argon arc heat source of the present invention;
图2为六个钨极呈直线排列形成线热源的示意图;Figure 2 is a schematic diagram of six tungsten electrodes arranged in a straight line to form a line heat source;
图3为九个钨电极形成的面热源的示意图;3 is a schematic diagram of a surface heat source formed by nine tungsten electrodes;
图4为六个钨电极形成的环形面热源的示意图。FIG. 4 is a schematic diagram of an annular surface heat source formed by six tungsten electrodes.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
需要说明的是,在不冲突的情况下,本发明中的实施例及实施例中的特征可以相互组合。It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.
下面结合附图和具体实施例对本发明作进一步说明,但不作为本发明的限定。The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.
本实施方式的多钨极氩弧热源,包括N个焊接电源、N个切换开关、M个钨极和氩保护气;N、M均取大于等于3的正整数;The multi-tungsten argon arc heat source of this embodiment includes N welding power sources, N switches, M tungsten electrodes and argon shielding gas; N and M are both positive integers greater than or equal to 3;
每个焊接电源的负极连接一个或多个钨极,M个钨极排列成形,除了排列的第一个和最后一个钨极,其余钨极至少有两个相邻的钨极,相邻两个钨极的间距能够保证电弧传递,相邻三个钨极分别连接不同的焊接电源;M个钨极位于母材的上方;The negative electrode of each welding power source is connected to one or more tungsten electrodes, and M tungsten electrodes are arranged and formed. Except for the first and last tungsten electrodes in the arrangement, the remaining tungsten electrodes have at least two adjacent tungsten electrodes. The spacing of tungsten electrodes can ensure arc transmission, and three adjacent tungsten electrodes are respectively connected to different welding power sources; M tungsten electrodes are located above the base metal;
每个焊接电源的正极通过一个切换开关连接母材;氩保护气分布在钨极与母材之间。The positive pole of each welding power source is connected to the base metal through a switch; the argon shielding gas is distributed between the tungsten electrode and the base metal.
本实施方式采用多个钨极排列出热源的形状,最少用三个焊接电源控制钨极的供电,一个切换开关控制一个焊接电源的焊接回路的通断,相邻三个钨极分别连接不同的焊接电源,例如:利用第一个焊接电源对第一个钨极通电,在第一个钨极与母材之间加一个电弧,第一个钨极进行电弧燃烧,利用第二个焊接电源对与第一个钨极相邻的第二个钨极通电,第一个钨极的电弧传递给第二个钨极,只有一个电弧在燃烧,电弧切换的瞬间有一个或两个电弧在燃烧,再利用第三个焊接电源对与与第二个钨极相邻的第三个钨极通电,第二个钨极的电弧传递给第三个钨极,……,按照这样的顺序,电弧传递到最后一个钨极,最后一个钨极再继续传递,电弧在多个钨电极之间切换,任意时刻只有一个电弧在燃烧,因此对每个钨电极而言,只有很少一部分时间燃弧,其余时间钨电极冷却,钨电极的电流承载能力将大大提高,可大幅度提高电弧能量。本实施方式可以根据工艺的要求,选择钨极排列组成需要的形状,所以对母材而言电弧的能量密度并不增加,因此可在保证稀释率的同时提高熔敷率,解决钨极氩弧堆焊的低熔敷率问题。In this embodiment, a plurality of tungsten electrodes are arranged to form a shape of a heat source, at least three welding power sources are used to control the power supply of the tungsten electrodes, one switch controls the on-off of the welding circuit of one welding power source, and three adjacent tungsten electrodes are respectively connected to different tungsten electrodes. Welding power source, for example: use the first welding power source to energize the first tungsten electrode, add an arc between the first tungsten electrode and the base metal, the first tungsten electrode is arc burned, and use the second welding power source to The second tungsten electrode adjacent to the first tungsten electrode is energized, the arc of the first tungsten electrode is transmitted to the second tungsten electrode, only one arc is burning, and one or two arcs are burning at the moment of arc switching, Then use the third welding power source to energize the third tungsten electrode adjacent to the second tungsten electrode, and the arc of the second tungsten electrode is transmitted to the third tungsten electrode, ..., in this order, the arc is transmitted To the last tungsten electrode, the last tungsten electrode continues to transmit, the arc switches between multiple tungsten electrodes, and only one arc is burning at any time. When the tungsten electrode cools down over time, the current carrying capacity of the tungsten electrode will be greatly improved, which can greatly increase the arc energy. In this embodiment, according to the requirements of the process, the tungsten electrode can be arranged to form the required shape, so the energy density of the arc does not increase for the base metal, so the deposition rate can be increased while the dilution rate is guaranteed, and the solution to the argon tungsten arc is solved. The problem of low deposition rate of surfacing welding.
优选实施例中,本实施方式的M个钨极排列成线形,形成线热源:包括直线和曲线。In a preferred embodiment, the M tungsten electrodes of this embodiment are arranged in a line shape to form a line heat source: including straight lines and curved lines.
优选实施例中,本实施方式的M个钨极排列成面形,形成面热源。In a preferred embodiment, the M tungsten electrodes of this embodiment are arranged in a surface shape to form a surface heat source.
优选实施例中,本实施方式的M个钨极排列成圆形,形成环形面热源。In a preferred embodiment, the M tungsten electrodes of this embodiment are arranged in a circle to form an annular surface heat source.
优选实施例中,由于钨极之间的电弧切换是否成功很大程度上依赖于钨电极间距,本实施方式使相邻两个钨极间的间距均相同。In the preferred embodiment, since the success of the arc switching between the tungsten electrodes depends largely on the spacing between the tungsten electrodes, in this embodiment, the spacing between two adjacent tungsten electrodes is the same.
优选实施例中,本实施方式的切换开关具有设定频率的通断、且能通过百安培数量级的电流。In a preferred embodiment, the switch of this embodiment has on-off at a set frequency and can pass a current of the order of hundreds of amperes.
每个焊接电源与多个钨电极形成焊接回路,在每个焊接回路中串联切换开关,可以设定频率控制回路的通断,来控制电弧的切换,为了保证热源分布均匀及能量,要保证切换开关的切换频率。Each welding power source and multiple tungsten electrodes form a welding circuit. A switch is connected in series in each welding circuit, and the on-off of the frequency control circuit can be set to control the switching of the arc. In order to ensure the uniform distribution of the heat source and energy, it is necessary to ensure the switching The switching frequency of the switch.
优选实施例中,焊接电源具有陡特性。In a preferred embodiment, the welding power source has a steep characteristic.
因为在引弧时需要高一点的电压,引弧以后电弧的电压大幅度下降。如果焊接电源和普通电源特性一样,容易造成电源短路,不能调整热源电流,还会使焊接电源过热,严重时烧掉。所以焊接电源采用改变调整初次级间耦合程度的办法来调整其输出特性,使次级拉弧以后焊接电源输出电压大幅度下跌而初级电流并不需要按变比增加,实现电压陡降。Because a higher voltage is required when striking the arc, the voltage of the arc drops significantly after striking the arc. If the welding power supply has the same characteristics as the ordinary power supply, it is easy to cause a short circuit of the power supply, the heat source current cannot be adjusted, and the welding power supply will overheat and burn out in severe cases. Therefore, the welding power source adopts the method of adjusting the coupling degree between the primary and secondary stages to adjust its output characteristics, so that the output voltage of the welding power source drops greatly after the secondary arc is drawn, and the primary current does not need to increase according to the transformation ratio, so that the voltage drops sharply.
本实施方式还提供一种热源控制方法,包括:This embodiment also provides a heat source control method, including:
通过切换开关的控制,使电弧在M个钨极中切换,任意时刻只有一个电弧在燃烧,获得线形热源或面形热源。Through the control of the switch, the arc is switched among M tungsten electrodes, and only one arc is burning at any time, obtaining a linear heat source or a surface heat source.
本实施方式还提供一种焊接装置,包括本实施方式所述的热源和焊炬;This embodiment also provides a welding device, including the heat source and the welding torch described in this embodiment;
所述热源的M个钨极同时设置在一个焊炬内。焊炬要保证:连接同一焊接电源的钨极间电气相通,连接不同焊接电源的钨极间电气绝缘。The M tungsten electrodes of the heat source are simultaneously arranged in one welding torch. The welding torch must ensure that the tungsten electrodes connected to the same welding power source are electrically connected, and the tungsten electrodes connected to different welding power sources are electrically insulated.
由于钨极之间的电弧切换是否成功很大程度上依赖于钨电极间距,因此设计焊炬时要保证钨电极间的间距相同。Since the success of arc switching between tungsten electrodes depends largely on the tungsten electrode spacing, the torch should be designed to ensure the same spacing between the tungsten electrodes.
实施例1:如图1和图2所示,本实施例的热源包括三个焊接电源、三个切换开关、六个钨极和氩保护气;六个钨电极呈直线排布,分别用数字1~6表示;使用三个电源,分别用A、B、C表示;1号和4号钨极连接焊接电源A,2号和5号钨极连接焊接电源B,3号和6号钨极连接焊接电源C;本实施例中钨极间距1-6mm,焊接电流30-500A,切换开关的切换频率1~1000Hz,钨极与母材间距为2~6mm;Embodiment 1: As shown in Figures 1 and 2, the heat source of this embodiment includes three welding power sources, three switching switches, six tungsten electrodes and argon shielding gas; 1 to 6 indicate; three power sources are used, indicated by A, B and C respectively; No. 1 and No. 4 tungsten electrodes are connected to welding power source A, No. 2 and No. 5 tungsten electrodes are connected to welding power source B, and No. 3 and No. 6 tungsten electrodes are connected to welding power source B. Connect the welding power source C; in this embodiment, the distance between the tungsten electrodes is 1-6mm, the welding current is 30-500A, the switching frequency of the switch is 1-1000Hz, and the distance between the tungsten electrode and the base metal is 2-6mm;
热源工作时,切换开关使电源A的焊接回路通电,电弧先在1号钨极燃弧,然后切换开关使电源B的焊接回路通电,电弧从1号切换到2号钨极,切换开关使电源A的焊接回路断电,接着电源C的焊接回路通电,电弧从2号切换到3号钨极,以设定的频率依次切换到6号钨极,再从6号钨极依次切换到1号钨极。通过电弧在多个钨极间切换,将钨极氩弧的点热源扩展成线热源。因为电弧在六个钨极之间切换,对每个钨极而言,只有六分之一的时间在燃弧,其余时间钨电极冷却,因此钨电极的电流承载能力大大提高,电弧能量大大提高,而作用在母材上的能量密度不增加,稀释率不增大。When the heat source is working, switch the switch to energize the welding circuit of power source A, the arc first burns on the No. 1 tungsten electrode, and then switch the switch to energize the welding circuit of power source B, the arc is switched from No. 1 to No. 2 tungsten electrode, and the switch makes the power The welding circuit of A is powered off, then the welding circuit of power source C is energized, the arc switches from No. 2 to No. 3 tungsten electrode, switches to No. 6 tungsten electrode at the set frequency, and then switches from No. 6 tungsten electrode to No. 1 in turn Tungsten electrode. By switching the arc between multiple tungsten electrodes, the point heat source of the tungsten argon arc is expanded into a line heat source. Because the arc switches between six tungsten electrodes, for each tungsten electrode, only one-sixth of the time is in the arc, and the tungsten electrode is cooled for the rest of the time, so the current carrying capacity of the tungsten electrode is greatly improved, and the arc energy is greatly improved , while the energy density acting on the base metal does not increase, and the dilution rate does not increase.
实施例2:如图3所示,本实施例的热源包括三个焊接电源、三个切换开关、九个钨极和氩保护气;九个钨电极呈3*3阵列排布,分别用数字1~9表示;使用三个电源,分别用A、B、C表示;1号、4号和7号钨极连接焊接电源A,2号、5号和8号钨极连接焊接电源B,3号、6号和9号钨极连接焊接电源C;本实施例中钨极间距1-6mm,焊接电流30-500A,切换开关的切换频率1~1000Hz,钨极与母材间距为2~6mm;Embodiment 2: As shown in Figure 3, the heat source of this embodiment includes three welding power sources, three switching switches, nine tungsten electrodes and argon shielding gas; the nine tungsten electrodes are arranged in a 3*3 array, and numbers are used 1 to 9 indicate; three power sources are used, indicated by A, B and C respectively; No. 1, No. 4 and No. 7 tungsten electrodes are connected to welding power source A, and No. 2, 5 and 8 tungsten electrodes are connected to welding power source B, 3 No. 6 and No. 9 tungsten electrodes are connected to welding power source C; in this embodiment, the tungsten electrode spacing is 1-6mm, the welding current is 30-500A, the switching frequency of the switch is 1-1000Hz, and the tungsten electrode and base metal spacing is 2-6mm ;
热源工作时,切换开关使电源A的焊接回路通电,电弧先在1号钨极燃弧,然后切换开关使电源B的焊接回路通电,电弧从1号切换到2号钨极,切换开关使电源A的焊接回路断电,接着使电源C的焊接回路通电,电弧从2号切换到3号钨极,以设定的频率依次切换到9号钨电极,再从9号钨极依次切换到1号钨极,通过电弧在多个钨极间切换,将钨极氩弧的点热源扩展成面热源。因为电弧在九个钨极之间切换,对每个钨极而言,只有九分之一的时间在燃弧,其余时间钨电极冷却,因此钨电极的电流承载能力大大提高,电弧能量大大提高,而作用在母材上的能量密度不增加,稀释率不增大。When the heat source is working, switch the switch to energize the welding circuit of power source A, the arc first burns on the No. 1 tungsten electrode, and then switch the switch to energize the welding circuit of power source B, the arc is switched from No. 1 to No. 2 tungsten electrode, and the switch makes the power The welding circuit of A is powered off, and then the welding circuit of power source C is energized, and the arc switches from No. 2 to No. 3 tungsten electrode, switches to No. 9 tungsten electrode at the set frequency, and then switches from No. 9 tungsten electrode to No. 1. No. tungsten electrode, the arc is switched between multiple tungsten electrodes, and the point heat source of the argon tungsten arc is expanded into a surface heat source. Because the arc switches between nine tungsten electrodes, for each tungsten electrode, only one-ninth of the time is in the arc, and the tungsten electrode is cooled for the rest of the time, so the current carrying capacity of the tungsten electrode is greatly improved, and the arc energy is greatly improved , while the energy density acting on the base metal does not increase, and the dilution rate does not increase.
实施例2:如图4所示,本实施例的热源包括三个焊接电源、三个切换开关、六个钨极和氩保护气;六个钨电极呈圆形排布,分别用数字1~6表示;使用三个电源,分别用A、B、C表示;1号和4号钨极连接焊接电源A,2号和5号钨极连接焊接电源B,3号和6号钨极连接焊接电源C;本实施例中钨极间距1-6mm,焊接电流30-500A,切换开关的切换频率1~1000Hz,钨极与母材间距为2~6mm;Embodiment 2: As shown in Figure 4, the heat source in this embodiment includes three welding power sources, three switching switches, six tungsten electrodes and argon shielding gas; the six tungsten electrodes are arranged in a circle, and the
热源工作时,切换开关使电源A的焊接回路通电,电弧先在1号钨极燃弧,然后切换开关使电源B的焊接回路通电,电弧从1号切换到2号钨极,切换开关使电源A的焊接回路断电,接着使电源C的焊接回路通电,电弧从2号切换到3号钨极,以设定的频率依次切换到6号钨极,再从6号钨极依次切换到1号钨极。通过电弧在多个钨极间切换,将钨极氩弧的点热源扩展成环形面热源。因为电弧在六个钨极之间切换,对每个钨极而言,只有六分之一的时间在燃弧,其余时间钨电极冷却,因此钨电极的电流承载能力大大提高,电弧能量大大提高,而作用在母材上的能量密度不增加,稀释率不增大。When the heat source is working, switch the switch to energize the welding circuit of power source A, the arc first burns on the No. 1 tungsten electrode, and then switch the switch to energize the welding circuit of power source B, the arc is switched from No. 1 to No. 2 tungsten electrode, and the switch makes the power The welding circuit of A is powered off, and then the welding circuit of power source C is energized, the arc switches from No. 2 to No. 3 tungsten electrode, switches to No. 6 tungsten electrode at the set frequency, and then switches from No. 6 tungsten electrode to No. 1. No. tungsten electrode. By switching the arc between multiple tungsten electrodes, the point heat source of the argon tungsten arc is expanded into an annular surface heat source. Because the arc switches between six tungsten electrodes, for each tungsten electrode, only one-sixth of the time is in the arc, and the tungsten electrode is cooled for the rest of the time, so the current carrying capacity of the tungsten electrode is greatly improved, and the arc energy is greatly improved , while the energy density acting on the base metal does not increase, and the dilution rate does not increase.
虽然在本文中参照了特定的实施方式来描述本发明,但是应该理解的是,这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是,可以对示例性的实施例进行许多修改,并且可以设计出其他的布置,只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是,可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是,结合单独实施例所描述的特征可以使用在其他所述实施例中。Although the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and other arrangements can be devised without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in different ways than are described in the original claims. It will also be appreciated that features described in connection with a single embodiment may be used in other described embodiments.
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