JP3752465B2 - Fluid jet type sputter removal method and function provided with no wind space forming function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid ejection type sputter removal method and apparatus for automatically removing spatter during a welding operation in a fluid ejection nozzle for forming a windless space under a strong wind environment.
[0002]
[Prior art]
In general, in the arc welding field, as a method of obtaining a space that prevents the flow of wind in an environment with wind, a method of shielding with a screen or awning, a method of shielding with a dedicated windproof jig, a windproof on the head of an automatic welding device There is a method of attaching and shielding a member.
Neither method is incomplete as a simple wind shielding function, and it is not considered that the welding atmosphere is stabilized by laminating.
Therefore, the inventors have filed Japanese Patent Application Nos. 2001-13054 and 2002-47585 as a method for solving this problem, and have invented the invention to prevent the invasion of wind.
In addition, as a conventional technique for preventing spatter adhesion, there are a method of applying a spatter adhesion preventing liquid to the nozzle, a method of periodically removing spatter adhering to the nozzle, and a method of using a carbon nozzle that is relatively difficult to adhere spatter. Yes, each method is used alone or in combination, but there is still no one that can completely achieve the purpose.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention adds a new function to the above-mentioned prior invention, and in a fluid jet nozzle for forming a windless space under a strong wind environment, a fluid jet type sputter removal that automatically removes spatter during welding work. It is an object to provide a method and apparatus.
[0004]
[Means for Solving the Problems]
The fluid jet spatter removal method of the present invention jets a high-speed ultra-thin layer barrier fluid from the narrow slit port of the fluid jet nozzle toward the inner wall of the Coanda nozzle, and performs a high-speed ultra-thin layer barrier along the curved surface of the Coanda nozzle. The fluid flows down, and the high-speed ultra-thin layer barrier fluid flows along the curved surface of the Coanda nozzle, thereby forming a high-speed ultra-thin layer barrier fluid coating layer on the inner wall of the Coanda nozzle, and the inner fluid surrounded by the Coanda nozzle. Spatter generated during welding that swirls around and splashes upward in the static pressure / non-wind space flows down on the high-speed ultra-thin layer barrier fluid, and the outside air enters the Coanda nozzle from the outside air introduction hole of the Coanda nozzle. Naturally flows into the enclosed area and is attracted to the weld base material along the Coanda nozzle, and this natural flow of outside air causes a pressure gradient in the peripheral area of the weld base material. It is the sum, but a large turbulence region of reduced pressure in the peripheral region are discharged to the outside along the welding base material surface with a sputter as accompanying flow of the laminar flow of high-speed ultra-thin barrier fluid.
Furthermore, the fluid ejection type sputter removal apparatus of the present invention includes a welding torch installed at a position spaced upward from the weld base material, an annular fluid ejection nozzle disposed so as to surround the welding torch, and the fluid In the sputter removal apparatus, which is arranged adjacent to the injection nozzle, and formed of an annular Coanda nozzle formed at the bottom end in a bell-bottom shape.
The welding torch includes a torch body in the center, composed of a Cie Rudonozuru to form a shielding gas passage so as to surround the periphery of the torch body, the torch body the contact tip is fixed to the distal end, said contact tip It has a welding wire protruding from the tip,
The fluid ejection nozzle is formed of an annular fluid reservoir chamber having a compressed fluid inlet at the upper side, a fluid dispersion material filled in the fluid reservoir chamber, and a lower portion of the fluid reservoir chamber, and is formed with respect to the central axis of the nozzle. It consists of a narrow slit opening that has a flow path that is inclined obliquely downward in the direction of the Coanda nozzle radially and inclined in the circumferential direction with respect to the radial shape of the central axis of the nozzle.
The Coanda nozzle is formed in a cylindrical shape adjacent to the fluid ejecting nozzle, and sputter adheres to the inner wall surface of the Coanda nozzle from the location where the compressed fluid ejected from the slit port of the fluid ejecting nozzle collides by the Coanda effect. In order to guide the high-speed thin-layer barrier fluid for swirling around with the inner fluid, it is extended downward with a bell-bottom-shaped curved surface to the vicinity of the contact tip, and a plurality of outside air introduction holes are formed around the lower end. It is what you are doing.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the fluid jet type sputter removing apparatus of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the fluid jet spatter removing apparatus of the present invention includes a welding torch 2 installed at a position spaced upward from a welding base material 1, and an annular shape disposed so as to surround the welding torch 2. The fluid jet nozzle 3 and an annular Coanda nozzle 4 which is disposed adjacent to the fluid jet nozzle 3 and has a lower end formed in a bell-bottom shape.
The welding torch 2 includes a torch body 5 at the center and a shield nozzle 7 that forms a shield gas passage 6 so as to surround the torch body 5, and the torch body 5 has a contact tip 8 at the tip. A welding wire 9 that is fixed and protrudes from the tip of the contact tip 8 is provided.
The fluid ejection nozzle 3 includes an annular fluid reservoir chamber 10 having a compressed fluid inlet (not shown) above, a steel wool fluid dispersion material 11 filled in the fluid reservoir chamber 10, It formed from reservoir 10 the lower fluid, and is inclined obliquely downward in the Coanda nozzle four directions radially with respect to the nozzle center axis, an opening having a flow passage for injecting inclined in the circumferential direction with respect to the radial nozzle central axis And a narrow slit opening 12.
The Coanda nozzle 4 is formed in a cylindrical shape adjacent to the fluid ejecting nozzle 3, and the contact tip 8 from a location where the compressed fluid ejected from the slit port 12 of the fluid ejecting nozzle 3 collides to produce the Coanda effect. A bell-bottom-shaped curved surface is extended down to the vicinity, and a plurality of outside air introduction holes 13 are formed around the lower end.
[0006]
Next, the operation of the fluid ejection type sputter removing apparatus of the present invention will be described with reference to FIG.
The compressed fluid 14 is introduced into the fluid reservoir chamber 10 through a compressed fluid inlet (not shown), and the compressed fluid 14 is dispersed by a dense steel wool-like fluid dispersion material 11 from which a random flow path can be obtained.
The compressed fluid 14 uniformly dispersed by the fluid dispersion material 11 is sprayed from the narrow slit port 12 of 100 μm or less toward the inner wall of the Coanda nozzle 4 to spray a high-speed ultrathin layer barrier fluid 15 on the curved surface of the Coanda nozzle 4. A high-speed ultra-thin layer barrier fluid 15 flows down along the tip, and a conical high-speed ultra-thin layer barrier fluid 15 is formed between the tip of the Coanda nozzle 4 and the weld base material 1 to prevent the atmosphere 16 from entering the welded portion 17. .
[0007]
When the conical high-speed ultrathin layer barrier fluid 15 that is a high-speed fluid collides with the welding base material 1 and is discharged to the outside, a large turbulent flow 19 is generated in the decompression region 18 in the peripheral region of the welding base material 1.
Since this large turbulent flow 19 is laminarized as an accompanying flow of the high-speed ultrathin layer barrier fluid 15 and is not discharged to the outside, the barrier inner fluid 20 also becomes turbulent.
Therefore, the outside air 21 is naturally introduced into the decompression region 18 along the barrier fluid inner surface 22 of the high-speed ultrathin layer barrier fluid 15 via the outside air introduction hole 13 formed around the lower end of the Coanda nozzle 4.
Ri圧 force gradient by the natural influx of external air 21 is reduced, high turbulence 19 is discharged to the outside along the welding base material 1 side as accompanying flow of the rectified high-speed ultra-thin barrier fluid 15.
[0008]
As a means for rectifying the large turbulent flow 19 generated in the high-speed ultrathin layer barrier fluid 15, the reduced pressure region in which the high-speed ultrathin layer barrier fluid 15 collides with the weld base material 1 to form the turbulent flow 19. The outside air 21 naturally flows into 18 and is laminarized.
Further, as a supplementary means, the high-speed ultra-thin layer barrier fluid 15 that is a main cause of the turbulent flow 19 is utilized as an actuator for preventing the turbulent flow 19 from being generated.
That is, by the viscous transmission of the high-speed ultrathin layer barrier fluid 15, the barrier inner fluid 20 surrounded by the high-speed ultrathin layer barrier fluid 15 is swirled and rectified to form a static pressure / no wind space in the center.
The welding torch 2 is disposed in the static pressure / non-wind space, and the rectified shield gas 24 is supplied to the welding portion 17 to perform high quality welding.
[0009]
Next, a fluid jet type sputter removal method for the high-speed ultrathin layer barrier fluid 15 will be described.
As shown in FIG. 1, the compressed fluid 14 uniformly dispersed by the fluid dispersion material 11 of the fluid jet nozzle 3 is directed from the narrow slit port 12 of 100 μm or less toward the inner wall of the Coanda nozzle 4 so as to be a high-speed ultrathin layer barrier fluid. 15 is sprayed to flow down the high-speed ultrathin layer barrier fluid 15 along the curved surface of the Coanda nozzle 4.
The high-speed ultrathin layer barrier fluid 15 flows along the curved surface of the Coanda nozzle 4 to form 15 high-speed ultrathin layer barrier fluid 15 on the inner wall of the Coanda nozzle 4, and the sputters 23 generated during welding generate static pressure / no wind space. Is scattered upward, but rides on the high-speed ultrathin barrier fluid 15 and flows downward.
The outside air 21 naturally flows from the outside air introduction hole 13 of the Coanda nozzle 4 due to the Coanda effect, and is attracted to the welding base material 1 along the Coanda nozzle 4.
Ri圧 force gradient by the natural influx of outside air 21 is relaxed, the outer high turbulence 19 along one side welding base material with a sputter 23 as accompanying flow of the rectified high-speed ultra-thin barrier fluid 15 Discharged.
[0010]
As a method for increasing the reliability of the rectification effect, the barrier inner fluid 20 surrounded by the high-speed ultrathin barrier fluid 15 can be swirled.
Usually, a method of turning the barrier inner fluid 20 surrounded by the high-speed ultrathin layer barrier fluid 15 itself as a swirling flow is conceivable.
However, in this method, when the slit port 12 of the fluid ejection nozzle 3 becomes narrower than 1 mm, it is difficult to pass the slit port 12 as a swirl flow at a high speed.
Therefore, a guide channel wall having an appropriate inclination angle is provided in the narrow slit port 12 of the fluid ejection nozzle 3 so that the flow direction of the high-speed ultrathin layer barrier fluid 15 is circumferential with respect to the radial direction of the nozzle central axis. injecting tilt.
Due to the viscosity transmission of the high-speed ultrathin layer barrier fluid 15, the barrier inner fluid 20 surrounded by the high-speed ultrathin layer barrier fluid 15 is rotated.
Since the gas is transmitted with a small viscosity, the swirl force in the outer peripheral region in contact with the high-speed ultrathin layer barrier fluid 15 is large, but the swirl is not performed in the central region.
Due to this phenomenon, a large turbulent flow 19 generated by the collision of the high-speed ultrathin layer barrier fluid 15 with the welding base material 1 is laminarized by a strong swirl force and discharged outside the high-speed ultrathin layer barrier fluid 15. A static pressure / no wind space is formed in the central region.
A shielding gas 24 such as CO2, CO2 + Ar, Ar, N2 gas, etc. is supplied from a welding torch 2 disposed in the center surrounded by the high-speed ultra-thin layer barrier fluid 15 into a static pressure / no wind space. The welding method performed inside can guarantee high-quality welding performance in which air does not enter the welded part even in a strong wind environment where the wind speed exceeds 10 m / s.
Incidentally, since the high-speed ultra-thin layer barrier fluid 15 itself does not rotate, centrifugal force does not work, and the expansion of the jet width of the high-speed ultra-thin layer barrier fluid 15 itself is suppressed.
Due to this effect, generation of a large turbulent flow 19 is suppressed, and a reduction in thrust can also be reduced.
[0011]
【The invention's effect】
The fluid jet spatter removal method of the present invention jets a high-speed ultra-thin layer barrier fluid from the narrow slit port of the fluid jet nozzle toward the inner wall of the Coanda nozzle, and performs a high-speed ultra-thin layer barrier along the curved surface of the Coanda nozzle. The fluid flows down, and the high-speed ultra-thin layer barrier fluid flows along the curved surface of the Coanda nozzle, so that a high-speed ultra-thin layer barrier fluid coating layer is formed on the inner wall of the Coanda nozzle and splashes upward in the static pressure / non-wind space. Spatter generated during welding flows down on the high-speed ultra-thin layer barrier fluid, so that spatter can be automatically removed during welding.
The fluid jet spatter removing apparatus of the present invention also provides a windless space where no outside air enters even under a strong wind environment where the wind speed exceeds 10 m / s, and it is necessary to fill the shield gas in an environment cut off from the atmosphere. It can be applied to various welding methods and other various fields, and by jetting the high-speed ultra-thin layer barrier fluid, the turbulent flow generated in the peripheral region of the high-speed ultra-thin layer barrier fluid and the peripheral region of the weld base metal is reduced. The effect and the effect which suppresses the velocity attenuation | damping of a barrier fluid are acquired.
[Brief description of the drawings]
FIG. 1 is a partially omitted longitudinal sectional view showing an outline of a fluid ejection type sputter removing apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Welding base material 2 Welding torch 3 Fluid injection nozzle 4 Coanda nozzle 5 Torch body 6 Shield gas passage 7 Shield nozzle 8 Contact tip 9 Welding wire 10 Fluid reservoir 11 Dispersing material 12 Slit port 13 Outside air introduction hole 14 Compressed fluid 15 Super high speed Thin layer barrier fluid 16 Atmosphere 17 Welded portion 18 Depressurized region 19 Turbulent flow 20 Barrier inner fluid 21 Outside air 22 Barrier fluid inner surface 23 Spatter 24 Shielding gas

Claims (2)

  The high-speed ultra-thin layer barrier fluid is sprayed along the curved surface of the Coanda nozzle from the narrow slit port of the fluid jet nozzle toward the inner wall of the Coanda nozzle, and this high-speed ultra-thin layer barrier flows down. As the fluid flows along the curved surface of the Coanda nozzle, a high-speed ultra-thin barrier fluid coating layer is formed on the inner wall of the Coanda nozzle, and the inner fluid surrounded by the Coanda nozzle is swirled to create a static pressure and no wind space. Spatter generated during welding that scatters upward flows down on the high-speed ultra-thin layer barrier fluid, and naturally flows outside air from the outside air introduction hole of the Coanda nozzle into the area surrounded by the Coanda nozzle. Along the surface of the welded base metal. Fluid jet sputtering removing method but characterized in that it is discharged to the outside along the welding base material surface with a sputtered are laminar as accompanying flow of the high-speed ultra-thin barrier fluid. A welding torch installed at a position spaced upward from the welding base material, an annular fluid injection nozzle disposed so as to surround the welding torch, and arranged adjacent to the fluid injection nozzle, with a bell bottom shape at the lower end In the spatter removal apparatus consisting of an annular Coanda nozzle formed in a wide area at the end,
The welding torch includes a torch body in the center, composed of a Cie Rudonozuru to form a shielding gas passage so as to surround the periphery of the torch body, the torch body the contact tip is fixed to the distal end, said contact tip It has a welding wire protruding from the tip,
The fluid ejection nozzle is formed from an annular fluid reservoir chamber having a compressed fluid inlet at the top, a fluid dispersion material filled in the fluid reservoir chamber, and a lower portion of the fluid reservoir chamber, and is formed with respect to the central axis of the nozzle. It consists of a narrow slit opening that has a flow path that is inclined obliquely downward in the direction of the Coanda nozzle radially and inclined in the circumferential direction with respect to the radial shape of the central axis of the nozzle.
The Coanda nozzle is formed in a cylindrical shape adjacent to the fluid ejecting nozzle, and sputter adheres to the inner wall surface of the Coanda nozzle from a location where the compressed fluid ejected from the slit port of the fluid ejecting nozzle collides by the Coanda effect. In order to guide the high-speed thin-layer barrier fluid for swirling with the inner fluid, the bellows-shaped curved surface is extended downward to the vicinity of the contact tip, and a plurality of outside air introduction holes are formed around the lower end. A fluid ejection type sputter removal apparatus characterized by comprising:

Images