WO2018036122A1 - 同轴空心钨极热丝tig焊枪、焊接装置及焊接方法 - Google Patents
同轴空心钨极热丝tig焊枪、焊接装置及焊接方法 Download PDFInfo
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- WO2018036122A1 WO2018036122A1 PCT/CN2017/074516 CN2017074516W WO2018036122A1 WO 2018036122 A1 WO2018036122 A1 WO 2018036122A1 CN 2017074516 W CN2017074516 W CN 2017074516W WO 2018036122 A1 WO2018036122 A1 WO 2018036122A1
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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
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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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
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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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
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- the invention relates to the technical field of hot wire TIG welding, in particular to a coaxial hollow tungsten hot wire TIG welding torch, a welding device and a welding method.
- the existing hot wire TIG welding is a high quality, high efficiency and energy saving TIG welding method. It is based on ordinary TIG welding, preheating the welding wire before the welding wire is fed into the molten pool to increase the heat input, increase the melting speed of the welding wire and the base metal, increase the welding speed and welding speed, and realize high-speed and high-efficiency welding. And retain all the advantages of TIG welding such as arc stabilization and excellent weld bead performance; suitable for welding medium thickness welded structures.
- the resistance heating method is used to preheat the welding wire, that is, before the welding wire is sent into the molten pool, a certain current is passed on the welding wire, and the welding wire is used to heat the wire to realize the preheating of the welding wire, but the preheating thereof
- the magnetic partial blow generated during the thermal process adversely affects the shape of the weld and the precise positioning of the arc.
- this process is suitable for welding materials with high electrical resistivity such as carbon steel and stainless steel, but it is difficult to apply to the welding of high conductivity materials such as copper and aluminum.
- copper alloys and aluminum alloys are widely used in the fields of national defense and nuclear power.
- the hot wire TIG welding technology suitable for copper alloys and aluminum alloys must be further improved in terms of welding efficiency, preheating effect and weld quality.
- the present invention aims to solve the above problems, and provides a coaxial hollow tungsten hot wire TIG welding torch, a welding device and a welding method, which are specifically realized by the following technical solutions:
- the coaxial hollow tungsten hot wire TIG welding gun comprises a gun body and a tungsten pole, wherein the gun body is hollow, and one end of the gun body is provided with a nozzle, and the tungsten pole is fixedly disposed in the middle of the gun body and the end portion thereof is worn.
- the nozzle is formed; the tungsten electrode is hollow, and its end portion has a wire hole through which the wire passes.
- the coaxial hollow tungsten hot wire TIG welding torch is further designed to form a first protective cavity in the inner space of the tungsten pole, and a second protective cavity is formed between the outer wall of the tungsten pole and the inner wall of the gun;
- the first protection chamber and the second protection chamber communicate with the inert shielding gas source through the channel.
- the coaxial hollow tungsten hot wire TIG welding torch is further designed to: the gun body sidewall is provided with an air inlet hole communicating with the inert shielding gas source; the tungsten electrode sidewall is provided with communication a communication hole of the first protection cavity and the second protection cavity.
- a coaxial hollow tungsten hot wire TIG welding device comprising a welding gun, a wire feeding mechanism and an inert protective gas source, the welding gun comprising a gun body and a tungsten pole, the gun body being hollow, and one end of the gun body is provided with a nozzle, a tungsten pole is axially fixedly disposed in a middle portion of the gun body and has an end portion penetrating the nozzle; the tungsten electrode is hollow and has an end portion having a wire hole through which the welding wire passes; the wire feeding mechanism includes a driving wheel And a wire spool having a wire wound, the wire on the wire spool being conveyed into the tungsten electrode via the driving wheel set, and an end of the wire passing through an end of the tungsten electrode; the inert shielding gas The gas source communicates with the inside of the gun body and the inside of the tungsten electrode through a pipe.
- the coaxial hollow tungsten hot wire TIG welding device is further designed to: the driving wheel set comprises two driving wheels rotatably disposed between the welding torch and the wire spool, and two driving wheels Symmetrically disposed, the rotation of the two is reversed, and the gap between the edges between the drive wheels is equal to the diameter of the wire so that the wire is clamped between the drive wheels and is rotated with the drive wheel It is delivered into the tungsten electrode.
- the welding method adopts a coaxial hollow tungsten hot wire TIG welding gun
- the welding gun includes a gun body and a tungsten pole, the gun body is hollow, and one end of the gun body is provided with a nozzle,
- the tungsten electrode is axially fixedly disposed in a middle portion of the gun body and has an end portion penetrating the nozzle; the tungsten electrode has a hollow shape, and an end portion thereof has a wire hole through which the welding wire passes.
- the coaxial hollow tungsten hot wire TIG welding method is further designed to include the steps of: placing the welding torch on one side of a workpiece to be welded, and the nozzle and the tungsten electrode are opposite to the joint to be welded;
- the wire mechanism enters the inner cavity of the tungsten pole, and the end of the welding wire passes through the wire hole; the inert protective gas is simultaneously supplied into the inside of the gun body and the inside of the tungsten electrode, and then the welding power source is connected to the welding seam of the tungsten electrode and the workpiece During the arcing, a weld pool is formed at the weld seam, and the inert protective gas sprayed from the nozzle covers the molten pool to form gas protection for the molten pool, and the temperature of the tungsten electrode begins to rise; the wire feeding mechanism continues to feed into the tungsten electrode.
- the welding wire enters the tungsten wire and receives the tungsten heat radiation.
- the arc heat is preheated before entering the mol
- the invention has the beneficial effects that the conventional solid tungsten electrode is improved into a hollow tungsten pole, and the welding wire conveyed by the conventional external automatic wire feeding device is passed through the hollow tungsten electrode for wire feeding, and the conventional gas supply device is used.
- the inert shielding gas is input from the air inlet hole of the welding gun body, and enters the hollow tungsten electrode through the corresponding communication hole on the hollow tungsten electrode; thereby realizing automatic wire feeding and preheating and gas protection before the welding wire enters the molten pool , greatly improving the preheating effect and avoiding the oxidation of the heated wire, reducing the energy of the arc melting wire, improving the deposition efficiency, welding speed, reducing the generation of pores such as H, improving the quality of the weld; and according to different arc output Power, the available hot wire temperature range is much wider than the traditional hot wire; the invention is suitable for welding in various joint forms, can realize fully automatic operation, and can freely move and easily change the site, saving cost and space, achieving more Functional,
- Figure 1 is a schematic view showing the structure of an embodiment of a welding torch of the present invention.
- FIG. 2 is a schematic view showing the structure of an embodiment of a welding apparatus of the present invention.
- the coaxial hollow tungsten hot wire TIG welding torch comprises a gun body 1 and a tungsten pole 2, the gun body 1 is hollow, and one end of the gun body is provided with a nozzle 11 and the tungsten pole 2 is axially It is fixedly disposed in the middle of the gun body and has its end penetrating out of the nozzle 11; the tungsten electrode 2 is hollow, and its end portion has a wire hole 21 through which the welding wire 5 passes.
- the inner space of the tungsten pole 2 forms a first protection cavity 22, and a second protection cavity 12 is formed between the outer wall of the tungsten electrode and the inner wall of the gun body 1.
- the first protection cavity 22 and the second protection cavity 12 communicate with the inert shielding gas source through the channel.
- the side wall of the gun body 1 is provided with an air inlet hole 13 communicating with a source of inert protective gas; the side wall of the tungsten electrode 2 is provided with a communication hole 23 communicating with the first protection chamber and the second protection chamber.
- a coaxial hollow tungsten hot wire TIG welding device includes a welding torch 3, a wire feeding mechanism 4 and an inert shielding gas source, and the welding torch 3 includes a gun body 1 and a tungsten electrode 2,
- the gun body 1 is hollow, and one end of the gun body is provided with a nozzle 11 which is fixedly disposed in the middle of the gun body 1 in the axial direction and whose end portion passes through the nozzle 11;
- the tungsten electrode 2 has a hollow shape, and the end portion thereof has a a wire hole 21 through which the wire passes;
- the wire feeding mechanism 4 includes a driving wheel set 41 and a wire reel 42 wound with a wire, the wire on the wire reel is conveyed into the tungsten electrode via the driving wheel set, and the end of the welding wire passes through the tungsten The end of the pole;
- the inert protective gas source communicates with the interior of the gun body and the interior of the tungsten pole through the pipeline.
- the driving wheel set 41 comprises two driving wheels 411 rotatably disposed between the welding gun and the welding wire disc, and the two driving wheels are symmetrically arranged, the rotation of the two is reversed oppositely, and the gap between the driving wheels and the welding wire The diameters are equal such that the wire is clamped between the drive wheels and fed into the tungsten pole as the drive wheel rotates.
- the coaxial hollow tungsten hot wire TIG welding method adopts the aforementioned coaxial hollow tungsten hot wire TIG welding gun, the welding gun includes a gun body and a tungsten pole, and the gun body is hollow and the gun body One end is provided with a nozzle, the tungsten pole is fixedly disposed in the middle of the gun body in the axial direction and the end portion thereof passes through the nozzle; the tungsten electrode is hollow, and the end portion has a wire hole through which the welding wire passes.
- the welding method specifically comprises the steps of: placing the welding torch on one side of the workpiece to be welded, and the nozzle and the tungsten electrode are opposite to the joint to be welded; the welding wire enters the inner cavity of the tungsten electrode through the wire feeding mechanism, and the end of the welding wire is self-owned The wire hole is pierced; an inert shielding gas is simultaneously supplied into the inside of the gun body and inside the tungsten electrode, and then the welding power source is turned on to arc between the tungsten electrode and the welding seam of the workpiece, and a weld pool is formed at the weld seam, and is ejected from the nozzle.
- the inert protective gas covers the molten pool to form gas protection for the molten pool, and the temperature of the tungsten electrode begins to rise; the wire feeding mechanism continuously feeds the welding wire into the tungsten electrode, and the wire entering the tungsten electrode receives the tungsten heat radiation and electricity.
- the arc heat is preheated before entering the molten pool, and the wire preheated by the tungsten electrode enters the molten pool for subsequent welding.
- the invention has the beneficial effects that the conventional solid tungsten electrode is improved into a hollow tungsten pole, and the welding wire conveyed by the conventional external automatic wire feeding device is passed through the hollow tungsten electrode for wire feeding, and the conventional gas supply device is used.
- the inert shielding gas is input from the air inlet hole of the welding gun body, and enters the hollow tungsten electrode through the corresponding communication hole on the hollow tungsten electrode; thereby realizing automatic wire feeding and preheating and gas protection before the welding wire enters the molten pool , greatly improving the preheating effect and avoiding the oxidation of the heated wire, reducing the energy of the arc melting wire, improving the deposition efficiency, welding speed, reducing the generation of pores such as H, improving the quality of the weld; and according to different arc output Power, the available hot wire temperature range is much wider than the traditional hot wire; the invention is suitable for welding in various joint forms, can realize fully automatic operation, and can freely move and easily change the site, saving cost and space, achieving more Functional,
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Abstract
一种同轴空心钨极热丝TIG焊枪,其中,焊枪包括枪体(1)和钨极(2),所述枪体(1)中空,枪体(1)的一端设置有喷嘴(11),所述钨极(2)沿轴向固定设置于枪体(1)的中部并且其端部穿出所述喷嘴(11);所述钨极(2)呈空心状,并且其端部具有供焊丝(5)通过的焊丝孔(21)。还涉及一种焊接装置及焊接方法。在焊丝进入熔池前进行预热和气体保护,大大提升了预热效果且避免了被加热焊丝的氧化,减少了电弧熔化焊丝的能量,提高了熔敷效率、焊接速度,提高焊缝质量。
Description
本发明涉及热丝TIG焊接技术领域,尤其为一种同轴空心钨极热丝TIG焊枪、焊接装置及焊接方法。
现有热丝TIG焊是一种优质、高效、节能的TIG焊方法。它是在普通TIG焊的基础上,在焊丝送进熔池之前对焊丝进行预热,以提高热输入量,增加焊丝和母材的熔化速度,提高熔敷速度、焊接速度,实现高速高效焊接;并保留了电弧稳定、焊缝性能优良等TIG焊的所有优点;适合于焊接中等厚度的焊接结构。
现有热丝TIG焊中,多采用电阻加热的方法预热焊丝,即:在焊丝送入熔池前,在焊丝上通过一定的电流,利用焊丝自身电阻产热实现焊丝预热,但其预热过程中产生的磁偏吹会对焊缝形状和电弧的准确定位产生不利的影响。且这种工艺较适用于碳钢、不锈钢等电阻率较高的材料的焊接,但它很难应用于铜、铝等高导电率材料的焊接上。目前,铜合金、铝合金大量应用在国防、核电等领域,适用于铜合金、铝合金的热丝TIG焊焊接技术无疑要在熔敷效率、预热效果、焊缝质量等方面需进一步提升。
发明内容
本发明目的在于解决上述问题,提供了一种同轴空心钨极热丝TIG焊枪、焊接装置及焊接方法,具体由以下技术方案实现:
同轴空心钨极热丝TIG焊枪,包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔。
所述的同轴空心钨极热丝TIG焊枪,其进一步设计在于,所述钨极内部空间形成第一保护腔,所述钨极外壁与所述枪体内壁之间形成第二保护腔;所述第一保护腔、第二保护腔通过孔道与惰性保护气体气源连通。
所述的同轴空心钨极热丝TIG焊枪,其进一步设计在于,所述枪体侧壁设置有与所述惰性保护气体气源连通的进气孔;所述钨极的侧壁设置有连通所述第一保护腔、第二保护腔的连通孔。
同轴空心钨极热丝TIG焊接装置,包括焊枪、送丝机构和惰性保护气体气源,所述焊枪包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔;所述送丝机构包括驱动轮组和收卷有焊丝的焊丝盘,焊丝盘上的焊丝经由所述驱动轮组被输送至所述钨极内,并且焊丝的端部穿出所述钨极的端部;所述惰性保护气体气源通过管路与所述枪体的内部以及钨极的内部连通。
所述的同轴空心钨极热丝TIG焊接装置,其进一步设计在于,所述驱动轮组包含两个可转动设置于所述焊枪与所述焊丝盘之间的驱动轮,并且两个驱动轮对称设置,两者的转动反向相反,驱动轮之间的边沿之间的间隙与所述焊丝的直径相等,从而所述焊丝被夹持于所述驱动轮之间并且随驱动轮的转动被输送入所述钨极内。
同轴空心钨极热丝TIG焊接方法,该焊接方法采用一种同轴空心钨极热丝TIG焊枪,该焊枪包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔。
所述的同轴空心钨极热丝TIG焊接方法,其进一步设计在于,包括如下步骤:将所述焊枪置于待焊接工件的一侧,并且喷嘴以及钨极与待焊接缝相对;焊丝经送丝机构进入钨极内部空腔,并且焊丝的端部自所述焊丝孔穿出;向枪体内部以及钨极内部同时送入惰性保护气体,继而接通焊接电源在钨极与工件的焊接缝之间起弧,焊接缝处形成熔池,自喷嘴喷出的惰性保护气体覆盖熔池从而对熔池形成气体保护,并且钨极的温度开始升高;送丝机构持续向钨极内送入焊丝,进入钨极的焊丝收到钨极热辐射、电弧热在进入熔池前预热升温,经过钨极预热的焊丝进入熔池进行后续焊接。
本发明的有益效果在于:本发明将传统的实心钨极改进为空心钨极、将传统的外置自动送丝装置所输送的焊丝穿过空心钨极进行送丝、将传统的供气装置所供惰性保护气体由焊枪枪体上的进气孔输入,经空心钨极上相对应的连通孔进入空心钨极内部;从而实现自动送丝,并在焊丝进入熔池前进行预热和气体保护,大大提升了预热效果且避免了被加热焊丝的氧化,减少了电弧熔化焊丝的能量,提高了熔敷效率、焊接速度,减少H等气孔的产生提高焊缝质量;而且根据不同的电弧输出功率,可得到的热丝温度范围比传统热丝大大拓宽;本发明适合各种接头形式的焊接,可实现全自动化操作,并可自由移动和轻松更换场地,节约了成本和空间,实现了多功能、人性化设计。
图1是本发明的焊枪实施例的结构示意图。
图2是本发明的焊接装置实施例的结构示意图。
以下结合说明书附图以及实施例对本发明进行进一步说明:
实施例1,如图1所示,该同轴空心钨极热丝TIG焊枪,包括枪体1和钨极2,枪体1中空,枪体的一端设置有喷嘴11,钨极2沿轴向固定设置于枪体的中部并且其端部穿出喷嘴11;钨极2呈空心状,并且其端部具有供焊丝5通过的焊丝孔21。
钨极2内部空间形成第一保护腔22,钨极外壁与枪体1内壁之间形成第二保护腔12;第一保护腔22、第二保护腔12通过孔道与惰性保护气体气源连通。
枪体1侧壁设置有与惰性保护气体气源连通的进气孔13;钨极2的侧壁设置有连通第一保护腔、第二保护腔的连通孔23。
实施例2,结合图1、图2所示,同轴空心钨极热丝TIG焊接装置,包括焊枪3、送丝机构4和惰性保护气体气源,焊枪3包括枪体1和钨极2,枪体1中空,枪体的一端设置有喷嘴11,钨极2沿轴向固定设置于枪体1的中部并且其端部穿出喷嘴11;钨极2呈空心状,并且其端部具有供焊丝通过的焊丝孔21;送丝机构4包括驱动轮组41和收卷有焊丝的焊丝盘42,焊丝盘上的焊丝经由驱动轮组被输送至钨极内,并且焊丝的端部穿出钨极的端部;惰性保护气体气源通过管路与枪体的内部以及钨极的内部连通。
驱动轮组41包含两个可转动设置于焊枪与焊丝盘之间的驱动轮411,并且两个驱动轮对称设置,两者的转动反向相反,驱动轮之间的边沿之间的间隙与焊丝的直径相等,从而焊丝被夹持于驱动轮之间并且随驱动轮的转动被输送入钨极内。
实施例3,对照图2可知,同轴空心钨极热丝TIG焊接方法采用了前述的一种同轴空心钨极热丝TIG焊枪,该焊枪包括枪体和钨极,枪体中空,枪体的一端设置有喷嘴,钨极沿轴向固定设置于枪体的中部并且其端部穿出喷嘴;钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔。
焊接方法具体包括如下步骤:将所述焊枪置于待焊接工件的一侧,并且喷嘴以及钨极与待焊接缝相对;焊丝经送丝机构进入钨极内部空腔,并且焊丝的端部自所述焊丝孔穿出;向枪体内部以及钨极内部同时送入惰性保护气体,继而接通焊接电源在钨极与工件的焊接缝之间起弧,焊接缝处形成熔池,自喷嘴喷出的惰性保护气体覆盖熔池从而对熔池形成气体保护,并且钨极的温度开始升高;送丝机构持续向钨极内送入焊丝,进入钨极的焊丝收到钨极热辐射、电
弧热在进入熔池前预热升温,经过钨极预热的焊丝进入熔池进行后续焊接。
本发明的有益效果在于:本发明将传统的实心钨极改进为空心钨极、将传统的外置自动送丝装置所输送的焊丝穿过空心钨极进行送丝、将传统的供气装置所供惰性保护气体由焊枪枪体上的进气孔输入,经空心钨极上相对应的连通孔进入空心钨极内部;从而实现自动送丝,并在焊丝进入熔池前进行预热和气体保护,大大提升了预热效果且避免了被加热焊丝的氧化,减少了电弧熔化焊丝的能量,提高了熔敷效率、焊接速度,减少H等气孔的产生提高焊缝质量;而且根据不同的电弧输出功率,可得到的热丝温度范围比传统热丝大大拓宽;本发明适合各种接头形式的焊接,可实现全自动化操作,并可自由移动和轻松更换场地,节约了成本和空间,实现了多功能、人性化设计。
Claims (7)
- 同轴空心钨极热丝TIG焊枪,其特征在于包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔。
- 根据权利要求1所述的同轴空心钨极热丝TIG焊枪,其特征在于,所述钨极内部空间形成第一保护腔,所述钨极外壁与所述枪体内壁之间形成第二保护腔;所述第一保护腔、第二保护腔通过孔道与惰性保护气体气源连通。
- 根据权利要求2所述的同轴空心钨极热丝TIG焊枪,其特征在于,所述枪体侧壁设置有与所述惰性保护气体气源连通的进气孔;所述钨极的侧壁设置有连通所述第一保护腔、第二保护腔的连通孔。
- 同轴空心钨极热丝TIG焊接装置,其特征在于包括焊枪、送丝机构和惰性保护气体气源,所述焊枪包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔;所述送丝机构包括驱动轮组和收卷有焊丝的焊丝盘,焊丝盘上的焊丝经由所述驱动轮组被输送至所述钨极内,并且焊丝的端部穿出所述钨极的端部;所述惰性保护气体气源通过管路与所述枪体的内部以及钨极的内部连通。
- 根据权利要求4所述的同轴空心钨极热丝TIG焊接装置,其特征在于,所述驱动轮组包含两个可转动设置于所述焊枪与所述焊丝盘之间的驱动轮,并且两个驱动轮对称设置,两者的转动反向相反,驱动轮之间的边沿之间的间隙与所述焊丝的直径相等,从而所述焊丝被夹持于所述驱动轮之间并且随驱动轮的转动被输送入所述钨极内。
- 同轴空心钨极热丝TIG焊接方法,其特征在于,该焊接方法采用一种同轴空心钨极热丝TIG焊枪,该焊枪包括枪体和钨极,所述枪体中空,枪体的一端设置有喷嘴,所述钨极沿轴向固定设置于枪体的中部并且其端部穿出所述喷嘴;所述钨极呈空心状,并且其端部具有供焊丝通过的焊丝孔。
- 根据权利要求6所述的同轴空心钨极热丝TIG焊接方法,其特征在于,包括如下步骤:将所述焊枪置于待焊接工件的一侧,并且喷嘴以及钨极与待焊接缝相对;焊丝经送丝机构进入钨极内部空腔,并且焊丝的端部自所述焊丝孔穿出;向枪体内部以及钨极内部同时送入惰性保护气体,继而接通焊接电源在钨极与工件的焊接缝之间起弧,焊接缝处形成熔池,自喷嘴喷出的惰性保护气体覆盖熔池从而对熔池形成气体保护,并且钨极的温度开始升高;送丝机构持续 向钨极内送入焊丝,进入钨极的焊丝收到钨极热辐射、电弧热在进入熔池前预热升温,经过钨极预热的焊丝进入熔池进行后续焊接。
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