JP4030211B2 - Weld spatter adhesion prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing welding spatter adhesion, and more specifically, a plurality of exhaust pipes made of metal are grouped together by welding on the side surface of one end thereof, and the opening at the one end is grouped. The present invention relates to a welding spatter adhesion preventing device that is detachably attached.
[0002]
[Prior art]
As is well known, when a plurality of metal exhaust pipes used as, for example, automobile parts are combined into one by welding, as shown in FIG. Be joined. Thereafter, the one end face of the exhaust pipe 81 gathered together is joined by welding. Here, when, for example, arc-welded metal inert gas welding (hereinafter simply referred to as “MIG welding”) is used as the welding method, as shown in FIG. 9, the electrode metal rod 83 and the base metal exhaust pipe 81 are connected. An arc is generated in between, and a part of the metal rod 83 continuously delivered from the nozzle 84 is melted by the heat of the arc, and at the same time, the molten metal rod 83 adheres to one end surface of the exhaust pipe 81 and is welded. The And while moving the nozzle 84, the one end surface of the some exhaust pipe 81 is joined by welding.
[0003]
That is, in order to prevent the exhaust gas from leaking outside through the gap between the exhaust pipes 81 adjacent to each other, as shown in FIG. The weld bead 85 is formed. In this case, as shown in FIG. 9, weld spatter 86 may be scattered at portions other than the weld bead 85 during welding and adhere to the inner surface of the exhaust pipe 81 from the opening 87 of the exhaust pipe 81. is there.
[0004]
Therefore, conventionally, in order to prevent welding spatter from adhering to the inner surface of the exhaust pipe, for example, the following method is employed.
[0005]
(1) An adhesion preventing agent for preventing adhesion of welding spatter is applied to the inner surface of the exhaust pipe. Here, in the portion where the adhesion preventing agent exists on the inner surface of the exhaust pipe, even when welding spatter is scattered during welding, the adhesion of welding spatter is weakened by the adhesion preventing agent, so that welding spatter adheres to that portion. There is nothing. In this way, adhesion of weld spatter to the inner surface of the exhaust pipe is prevented.
[0006]
(2) A sheet-like flameproof material (ceramic wool) is wound and packed along the inner surface of the exhaust pipe, and the inner surface of the exhaust pipe is protected from welding spatter by this flameproof material.
[0007]
(3) By fitting a fitting corresponding to the internal shape of each exhaust pipe into the inside of the exhaust pipe, even if weld spatter is scattered during welding, the weld spatter adheres to the fitting. In this way, adhesion of welding spatter to the inner surface of the exhaust pipe is prevented.
[0008]
(4) The exhaust pipe is immersed in a water bath, and only one end surface of the welded portion of the exhaust pipe is exposed on the water surface. Here, even when welding spatter is scattered during welding, if the welding spatter is sufficiently cooled with water, the adhesion of the welding spatter is weakened. Therefore, welding spatter does not adhere to the inner surface of the exhaust pipe.
[0009]
[Problems to be solved by the invention]
As described above, although the above-described methods (1) to (4) can prevent the welding spatter from adhering to each other, these methods do not always provide an accurate adhesion preventing effect. Also, workability during welding is poor.
[0010]
That is, in the method (1), a portion where the adhesion preventing agent evaporates due to heat during welding, so that weld spatter scattered during welding adheres to the inner surface of the exhaust pipe. In addition, since an anti-adhesive agent must be applied to the inner surface of each exhaust pipe, workability during welding deteriorates.
[0011]
In the above method (2), since the flameproof material is only wound and packed along the inner surface of the exhaust pipe, the adhesion tends to vary, and the gap between the inner surface of the exhaust pipe and the flameproof material is likely to occur. There will be a gap. Further, when the flameproof material is used for a long time, the flameproof material is frayed and the inner surface of the exhaust pipe is exposed at the frayed portion.
[0012]
Therefore, there is a possibility that weld spatter scattered during welding adheres from a gap between the inner surface of the exhaust pipe and the flameproof material or a portion where the flameproof material is frayed. Moreover, since the operation | work which packs a flameproof material in each exhaust pipe is required, the operation | work takes time.
[0013]
In the above method (3), since the exhaust pipe is deformed due to heat during welding, a gap is partially generated between the exhaust pipe and the metal fitting. There is a risk of adhesion. In addition, the exhaust pipe may be deformed by heat during welding, or the weld bead bulges on the inner surface side of the exhaust pipe, so there is a risk that the fitting corresponding to the internal shape cannot be taken out from the exhaust pipe. Have difficulty in work.
[0014]
In the method (4), the weld spatter that has not been sufficiently water-cooled may be scattered with the adhesive force left, and may adhere to the inner surface of the exhaust pipe. Further, since the welding operation is performed with the exhaust pipe immersed in a water bath, there is a risk of electric shock due to leakage of the welding current, which makes the operation difficult.
[0015]
The present invention has been made in view of such circumstances, and an object of the present invention is to reliably prevent welding spatter from adhering to the inner surface of the exhaust pipe and to improve workability during welding. An object of the present invention is to provide an apparatus for preventing welding spatter adhesion.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a plurality of exhaust pipes made of a metal material are grouped together by welding on the side surface of one end thereof, and the opening at the one end is grouped. An apparatus for preventing welding spatter adhesion that is detachably attached and exposes a portion of the exhaust pipe to which arc welding is applied after the attachment and is disposed so as to close the opening. A member, a slide member supported so as to be movable back and forth with respect to the closing member, and disposed so as to be capable of moving toward and away from the inner surface of the exhaust pipe, and adjusting means for adjusting the forward and backward movement of the slide member The gist is that
[0017]
According to the first aspect of the present invention, the slide member of the welding spatter adhesion preventing device is adjusted by the adjusting means so that the slide member can suitably move forward and backward with respect to the closing member. For this reason, since the slide member can be brought into contact with and separated from the inner surface of the exhaust pipe by the forward and backward movement of the slide member supported with respect to the closing member, the opening at one end of the exhaust pipe integrated into one The welding spatter adhesion preventing device is detachably attached to the part in a stable state. Then, after the welding spatter adhesion preventing device is attached to the opening of the exhaust pipe, arc welding is performed on a portion that is not closed by the closing member, that is, a portion where one end surface of the exhaust pipe is exposed.
[0018]
In addition, when the welding spatter adhesion preventing device is attached to the opening of the exhaust pipe, the closing member comes to close the opening at a portion other than one end face of the exposed exhaust pipe to which arc welding is performed. The slide member supported by the closing member is in contact with the inner surface of the exhaust pipe. For this reason, even when arc welding is performed on an exposed portion of one end face of the exhaust pipe and welding spatter is scattered, the weld spatter adheres to at least one of the closing member and the slide member, and the weld spatter is opened in the exhaust pipe. It does not adhere to the inner surface of the exhaust pipe from the part. At this time, one end surfaces of the plurality of exhaust pipes are joined by arc welding, and a weld bead is formed on each one end surface.
[0019]
Further, when the welding spatter adhesion preventing device is removed from the opening, the slide member is exhausted by the forward / backward movement of the slide member even when the weld bead formed on one end surface of the exhaust pipe bulges to the inner surface side of the exhaust pipe. Since it is in a state where it can contact and separate from the inner surface of the pipe, the weld spatter adhesion preventing device is smoothly removed from the opening of the exhaust pipe.
[0020]
As described above, by merely moving the slide member of the welding spatter adhesion preventing device adjusted by the adjusting means forward and backward relative to the closing member, the slide member can be brought into contact with and separated from the inner surface of the exhaust pipe. Since the welding spatter adherence prevention device can be easily attached to and detached from the opening at one end of the exhaust pipe combined into one, the workability during welding can be improved.
[0021]
The gist of the invention according to claim 2 is that, in the weld spatter adhesion preventing device according to claim 1, the adjusting means adjusts the urging force of the spring with a screw.
[0022]
According to the second aspect of the invention, in addition to the action of the first aspect of the invention, the spring biasing force can be easily adjusted by simply screwing or unscrewing the screw, and the exhaust pipe. The advancing / retreating movement of the slide member relative to the closing member is also adjusted so that the inner surface of the slide member can be brought into contact with and separated from the inner surface.
[0023]
A third aspect of the present invention is the welding spatter adhesion preventing device according to the first or second aspect, wherein the closing member and the slide member are metal materials having higher thermal conductivity than the metal material of the exhaust pipe. The gist of this is that it was formed.
[0024]
According to the third aspect of the invention, in addition to the action of the first or second aspect of the invention, even when arc welding is performed and weld spatter is scattered on at least one of the closing member and the slide member, Since the closing member and the slide member having higher thermal conductivity than the exhaust pipe easily release the heat of the welding spatter, the welding spatter is immediately cooled on the closing member and the slide member, and hardly adheres to the closing member and the slide member. Therefore, the welding spatter is placed on the closing member and the slide member, and is easily removed from the closing member and the slide member.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which a welding spatter adhesion preventing apparatus of the present invention is applied to an exhaust manifold constituting a part of an automobile exhaust system will be described with reference to FIGS. The description will be made with reference to FIGS.
[0026]
As shown in FIG. 1 to FIG. 3, the welding spatter adhesion preventing device 11 includes a closing member 15 disposed so as to close the opening 14 of the exhaust pipe 13 of the exhaust manifold 12, and a forward and backward movement with respect to the closing member 15. The slide member 16 is movably supported, and includes a spring 17 and the like for adjusting the forward / backward movement of the slide member 16. In the present embodiment, the exhaust manifold 12 is formed of four stainless steel exhaust pipes 13, and the four exhaust pipes 13 are joined by welding at four locations on the side surfaces of one end thereof. (See FIG. 8).
[0027]
The closing member 15 is formed in a substantially disc shape from brass of a metal material, and a substantially cross-shaped hole 18 is bored in the central portion thereof. The brass forming the closing member 15 is a metal material having a higher thermal conductivity than the stainless steel forming the exhaust pipe 13. Further, as shown in FIG. 7, when the welding spatter adhesion preventing device 11 is attached to the opening 14 at one end of the exhaust pipe 13 that is combined into one, one exhaust pipe 13 is connected through the hole 18. The part where the end face is subjected to MIG welding is exposed.
[0028]
As shown in FIGS. 1 to 3, the closure member 15 is provided with four accommodation holes 19 for accommodating the slide member 16 so as to be capable of moving forward and backward, and surrounds the accommodation hole 19 on the upper surface of the closure member 15. The stopper 20 is formed so as to protrude. The stopper 20 restricts the forward / backward movement of the slide member 16 in the accommodation hole 19. Further, female screws 21 communicating with the respective receiving holes 19 are threaded at the end of the closing member 15, and male screws 22 are screwed into the female screws 21. Then, the urging force of the spring 17 is adjusted by screwing the male screw 22 in or out of the female screw 21. A nut 23 is screwed to the male screw 22 in order to maintain the screwed state, that is, the adjusted state of the spring 17.
[0029]
Like the closing member 15, the slide member 16 is formed from a metal material brass in a substantially L-shaped cross section or a substantially inverted L-shaped cross section, and is arranged so as to be able to contact and separate from the inner surface of the exhaust pipe 13. Yes. The slide member 16 is brought into contact with and separated from the inner surface of the exhaust pipe 13 by the forward and backward movement of the slide member 16 relative to the closing member 15. An insertion portion 24 slightly smaller than the shape corresponding to the internal shape of each exhaust pipe 13 is formed at the lower portion of the slide member 16, and the end of the insertion portion 24, that is, the inner surface of the exhaust pipe 13 is formed. The portion on the contact side is chamfered to form a curved portion 25. Note that, when the curved portion 25 is in contact with the inner surface of the exhaust pipe 13, the welding spatter described later is less likely to enter the boundary portion between the exhaust pipe 13 and the curved portion 25. A substantially T-shaped support portion 26 supported by the stopper 20 is formed on the upper portion of the slide member 16.
[0030]
The slide member 16 is provided with a receiving portion 27 communicating with the receiving hole 19 so that the spring 17 is retractable relative to the receiving portion 27. The spring 17 expands and contracts so as to follow the forward / backward movement due to the movement of the slide member 16 in the forward / backward direction. In the welding spatter adhesion preventing device 11 before installation, the slide member 16 is held in a state of being moved in the forward direction by the urging force of the spring 17.
[0031]
In the present embodiment, as an adjusting means for adjusting the forward / backward movement of the slide member 16, an adjustment means is used in which the urging force of the spring 17 is adjusted by the female screw 21, the male screw 22 and the nut 23 of the closing member 15. Yes. By this adjusting means, the forward / backward movement of the slide member 16 is suitably adjusted.
[0032]
Now, the welding spatter adhesion preventing apparatus of the present embodiment configured as described above is used in the following procedure.
[0033]
As shown in FIG. 3, first, the welding spatter adhesion preventing device 11 is arranged so as to be attached from above to the opening 14 at one end of the exhaust pipe 13 combined. In this case, the insertion part 24 of each slide member 16 is made to correspond to the opening part 14 of each exhaust pipe 13.
[0034]
And as shown in FIG. 4, the welding spatter adhesion prevention apparatus 11 is attached to the opening part 14 of the one end part of the exhaust pipe 13 from upper direction. At this time, the slide member 16 moved in the forward direction is moved in the backward direction against the urging force of the spring 17 at the same time as contacting the inner surface of the exhaust pipe 13 by the curved portion 25 of the insertion portion 24. Thereafter, the insertion portion 24 is pushed into the inner surface of the exhaust pipe 13 while being brought into contact with the curved portion 25, and is inserted into the exhaust pipe 13.
[0035]
Then, as shown in FIGS. 5 and 7, the welding spatter adhesion preventing device 11 is detachably attached to the opening 14 at one end of the exhaust pipe 13 in a stable state. In this case, the slide member 16 presses the inner surface of the exhaust pipe 13 by the curved portion 25 by the adjusted urging force of the spring 17, and the insertion portion 24 comes into close contact with the inner surface of the exhaust pipe 13 by the pressing force. Held in a state. In FIG. 7, it is drawn so that there is a gap between the inner surface of the exhaust pipe 13 and the insertion part 24, but the opening part 14 of the exhaust pipe 13 is actually formed by the closing member 15 and the insertion part 24. It is blocked. In this case, the insertion portion 24 has a gap (escape) with respect to the inner surface of the exhaust pipe 13 and the closing member 15 closes the opening 14 of the exhaust pipe 13.
[0036]
Then, the exposed part of the one end surface of the exhaust pipe 13 is welded by MIG welding. That is, in order to prevent the exhaust gas from leaking outside through the gap between the exhaust pipes 13 adjacent to each other, the end faces of the exhaust pipe 13 are welded so as to be in a sealed state. More specifically, a part of the metal rod 30 continuously fed from the nozzle 29 of the MIG welder 28 is melted by the heat of the arc, and at the same time, the molten metal rod 30 adheres to one end surface of the exhaust pipe 13. And welded.
[0037]
And if the predetermined position of the one end surface of the exhaust pipe 13 is welded, moving the nozzle 29, the cross-shaped welding bead 31 will bulge and form in the welding part (refer FIG. 10). At this time, the welding spatter 32 may be scattered on the portion other than the weld bead 31, that is, at least one of the closing member 15 and the curved portion 25. Adherence is reliably prevented. In this case, since the closing member 15 and the curved portion 25 made of a metal material having a higher thermal conductivity than the exhaust pipe 13 can easily release the heat of the welding spatter 32, the welding spatter 32 is immediately cooled on the closing member 15 and the curved portion 25. Thus, it is difficult to adhere to the closing member 15 and the bending portion 25. Here, the welding spatter 32 is placed on the closing member 15 and the bending portion 25 and is easily removed from the closing member 15 and the bending portion 25.
[0038]
Even if the welding spatter 32 is scattered toward the boundary portion between the exhaust pipe 13 and the curved portion 25, the curved portion 25 is formed of a metal material having a higher thermal conductivity than the exhaust pipe 13. In addition, since the weld spatter 32 does not easily enter the boundary portion between the exhaust pipe 13 and the curved portion 25, the exhaust pipe 13 and the curved portion 25 are not joined by the weld sputter 32.
[0039]
Finally, when the welding spatter adhesion preventing device 11 in the state shown in FIG. 5 is removed from the opening 14 of the exhaust pipe 13, when the welding spatter adhesion preventing device 11 is pulled upward as shown in FIG. Moves while contacting the inner surface of the exhaust pipe 13, and then the curved portion 25 comes into contact with the weld bead 31 bulging and formed on the inner surface side of the exhaust pipe 13. At this time, the slide member 16 that has been moved in the backward direction is further moved in the backward direction against the urging force of the spring 17 at the same time as contacting the weld bead 31 by the curved portion 25 of the insertion portion 24.
[0040]
Thereafter, when the welding spatter adhesion preventing device 11 is further lifted upward, the bending portion 25 moves along the outer shape of the weld bead 31, and eventually the bending portion 25 is separated from the weld bead 31. At this time, the slide member 16 that has been moved in the backward direction is moved in the forward direction by the urging force of the spring 17 and is held in a state before attachment. In this manner, the weld spatter adhesion preventing device 11 is removed from the opening 14 at one end of the exhaust pipe 13 as indicated by a two-dot chain line in FIG. As described above, the welding spatter adhesion preventing apparatus 11 of the present embodiment is used.
[0041]
According to the embodiment described above in detail, the following effects can be obtained.
[0042]
In the present embodiment, when the exposed portion of the one end face of the exhaust pipe 13 is welded by MIG welding, the opening 14 of the exhaust pipe 13 is closed with the closing member 15 and the insertion part 24. For this reason, even when the welding spatter 32 is scattered, it is possible to reliably prevent the welding spatter 32 from adhering to the inner surface of the exhaust pipe 13 from the opening 14 of the exhaust pipe 13.
[0043]
-According to the present embodiment, since the welding spatter adhesion preventing device 11 can be easily attached to and detached from the opening 14 at one end of the exhaust pipe 13, the workability during MIG welding can be improved. it can.
[0044]
According to the present embodiment, the urging force of the spring 17 can be easily adjusted by simply screwing or unscrewing the male screw 22 with respect to the female screw 21, and the inner surface of the exhaust pipe 13 can be adjusted. Thus, the forward / backward movement of the slide member 16 with respect to the closing member 15 can also be suitably adjusted so that the contact / separation is possible.
[0045]
In the present embodiment, the closing member 15 and the curved portion 25 are made of brass having a higher thermal conductivity than the stainless steel exhaust pipe 13. For this reason, even when the welding spatter 32 scatters on the closing member 15 and the bending portion 25 during MIG welding, the welding spatter 32 is prevented from adhering to the closing member 15 and the bending portion 25, and the closing member 15 and the bending portion 25. The weld spatter 32 can be easily removed from above.
[0046]
According to the present embodiment, even when the welding spatter 32 is scattered toward the boundary portion between the exhaust pipe 13 and the curved portion 25, the exhaust pipe 13 and the curved portion 25 are joined by the weld spatter 32. It can be prevented in advance.
[0047]
-According to the present embodiment, it is only necessary to use the welding spatter adhesion preventing device 11 in order to prevent the welding spatter 32 from adhering to the inner surface of the exhaust pipe 13, so that the exhaust manifold at the time of MIG welding is used. 12 manufacturing costs can be reduced.
[0048]
It should be noted that the embodiment described above can be modified as follows.
[0049]
In the above embodiment, as the adjusting means, the urging force of the spring 17 is adjusted with the female screw 21, the male screw 22 and the nut 23. However, for example, hydraulic pressure, air pressure, etc. may be used. As long as the forward / backward movement of the slide member 16 can be accurately adjusted, the slide member 16 is not particularly limited to the above embodiment.
[0050]
In the above embodiment, the closing member 15 and the slide member 16 are made of brass. However, for example, the closing member 15 and the slide member 16 may be made of a metal material such as copper, ceramics having excellent heat resistance, etc. It is not something. In this case, it is desirable that the material has a higher thermal conductivity than the metal material of the exhaust pipe 13.
[0051]
In the above embodiment, MIG welding which is arc welding is adopted as a welding method, but for example, metal active gas welding (mag welding) may be adopted, and the welding method is particularly limited to MIG welding. is not. In short, it may be applied to a welding method in which welding spatter is scattered during welding.
[0052]
In the embodiment, the exhaust pipe 13 is made of stainless steel, but may be made of a metal material such as cast iron.
[0053]
In the above embodiment, four exhaust pipes 13 are used, but the number of exhaust pipes is arbitrary as long as the number is two or more.
[0054]
【The invention's effect】
According to the first aspect of the present invention, it is possible to reliably prevent welding spatter from adhering to the inner surface of the exhaust pipe and improve workability during welding.
[0055]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the urging force of the spring can be easily adjusted with a screw and can be brought into and out of contact with the inner surface of the exhaust pipe. Thus, the forward / backward movement of the slide member relative to the closing member can be adjusted so as to be in a stable state.
[0056]
According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is possible to suppress welding spatter from adhering to the closing member and the slide member, and from above the closing member and the slide member. Weld spatter can be easily removed.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a welding spatter adhesion preventing apparatus according to the present invention.
FIG. 2 is a bottom view showing the welding spatter adhesion preventing apparatus of the embodiment.
FIG. 3 is a cross-sectional view schematically showing a cross-sectional structure before attachment of the welding spatter adhesion preventing device in the same embodiment.
FIG. 4 is a cross-sectional view schematically showing a state immediately before the welding spatter adhesion preventing device is attached in the same embodiment.
FIG. 5 is a cross-sectional view schematically showing a cross-sectional structure after the welding spatter adhesion preventing device is attached in the same embodiment.
FIG. 6 is a cross-sectional view schematically showing a cross-sectional structure immediately before removing the welding spatter adhesion preventing device of the embodiment.
FIG. 7 is a plan view schematically showing a state after the welding spatter adhesion preventing device is attached in the same embodiment.
FIG. 8 is a plan view schematically showing a state in which four exhaust pipes are combined into one;
FIG. 9 is a cross-sectional view schematically showing a state after MIG welding of the exhaust pipe.
FIG. 10 is a plan view schematically showing a state after the MIG welding of the exhaust pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Weld spatter adhesion prevention apparatus 13 Exhaust pipe 14 Opening part 15 Closure member 16 Slide member 17 Spring 21 Female screw 22 Male screw 23 Nut

Claims (3)

A plurality of exhaust pipes made of a metal material are gathered together by welding at one end side thereof, and a welding spatter adhesion preventing device that is detachably attached to an opening at the gathered one end,
Exposing the portion where the arc welding of the one end surface of the exhaust pipe is performed after the mounting, and a closing member disposed so as to close the opening,
A slide member which is supported so as to be movable back and forth with respect to the closing member, and which is disposed so as to be able to contact and separate from the inner surface of the exhaust pipe;
An apparatus for preventing welding spatter adhesion, comprising an adjusting means for adjusting the forward / backward movement of the slide member. 2. The welding spatter adhesion preventing apparatus according to claim 1, wherein the adjusting means adjusts the biasing force of the spring with a screw. The welding spatter adhesion according to claim 1 or 2, wherein the closing member and the slide member are made of a metal material having a higher thermal conductivity than the metal material of the exhaust pipe. Prevention device.

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