JPH10193101A - Fillet welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the defective welding and to serve to sure welding strength. SOLUTION: A fillet welding method is the one, by which a projection 13 is pre-formed to a welding part 10f of a first member (flange-like parts) 1 and a welding part 2f of a second member (pipe-like parts) 2 is brought into contact with the projection 13, and a torch 4 is approached and the projection 13 is melted while supplying a welding filler 5 to execute the welding of the first member 1 and the second member 2. This method is applied to an intake manifold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fillet welding method for welding a first member having a portion to be welded and a second member having a portion to be welded. The method of the present invention can be applied to, for example, the manufacture of an intake manifold for an intake system equipped in an internal combustion engine.

[0002]

2. Description of the Related Art The prior art will be described by taking an intake manifold of an intake system provided in an internal combustion engine as an example. The intake manifold has a plurality of pipe-shaped components and a flange-shaped component that collects the pipe-shaped components and connects the pipe-shaped components to an internal combustion engine. In assembling the flange-shaped part and the pipe-shaped part, as shown in FIG.
The pipe-like part 2 is inserted into the through hole 101 of the flange-like part 100.
00, and an arc is generated by the TIG torch 300 to form a fused portion 305. The formed fused portion 305
There is known a method of supplying a filler 400 for welding to perform welding.

[0003] Also, JP-A-60-15069 discloses that
As shown in FIG.
Step 1 is formed on the inner surface of
Ring-shaped boss 503 protruding in the axial direction at the periphery of
Is formed, and a shaft end portion 600 of an Al pipe-shaped component 600 is formed.
a is inserted into the through-hole 501, TIG arc welding is performed along the boss 503 without using a welding filler, and a circumferential fillet welding method for fusing the boss 503 to the pipe-shaped component 600 is disclosed. ing.

[0004]

According to the technique shown in FIG.
The welding filler 400, which is an additive, is supplied by driving a motor. However, there is a limit to making the supply speed of the welding filler 400 uniform at all times due to slippage of the welding filler 400 and the like. is there. for that reason,
The supply of the welding filler 400 may be slightly delayed.

[0005] In an extreme case, the supply of the welding filler 400 may be delayed, and the melted portion 305 may become insufficient. At this time, as shown in FIG. 7, the melted portion 305 is easily separated into the melted portions 305a and 305c, the build-up becomes insufficient, and the welding tends to be poor. In the technique shown in FIG.
The shaft end 600a of the pipe-shaped part 600 is positioned while the shaft end 600a of the aluminum pipe-shaped part 600 is applied to the step 502 of the flange-shaped part 500.
Is not fused and is not always enough to secure welding strength.

The present invention has been made in view of the above circumstances, and has as its object to provide a fillet welding method capable of reducing welding defects and contributing to securing welding strength by using projections.

[0007]

A fillet welding method according to the present invention uses a first member having a portion to be welded and a second member having a portion to be welded, and welds the first member. Is a fillet welding method in which fillet welding is performed in a state where a portion and a portion to be welded of a second member are overlapped with each other, wherein a projection is formed in advance on a portion to be welded of a first member, and a second member is formed. The welding portion is applied to the projection, the projection is melted while supplying a welding filler, and the welded portion of the first member and the welded portion of the second member are welded. .

[0008]

According to the method of the present invention, the projection is formed in advance on the portion to be welded of the first member, and the projection is melted while supplying the welding filler, so that the supply of the welding filler tends to be delayed. In this case, the amount of build-up is easily ensured.
The cross-sectional shape of the projection can be appropriately selected from a square shape, a stepped shape, a right triangle shape, and the like.

According to the method of the present invention, the first member, the projection,
The second member and the welding filler can be made of the same material or the same material. In consideration of weight reduction, it is preferable to use an Al-based material, but in some cases, another light metal-based or iron-based material may be used. The first member and the second member can be used for a fluid device through which a fluid such as air passes. According to the method of the present invention, a known welding mode such as a lap joint, a T-joint, or a square joint can be appropriately selected as the welding mode.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, TIG welding is performed. In this embodiment, a disc-shaped flange-shaped part 1 as a first member and a pipe-shaped part 2 as a second member are used. A through hole 10 is formed in the flange-shaped part 1. The through hole 10 is a circular hole. Inner peripheral portion 10 of through hole 10
f functions as a portion to be welded. The pipe-shaped part 2 has a round pipe shape and has a pipe hole 2w. The shaft end 2f of the pipe-shaped part 2 functions as a portion to be welded. Flange part 1
And the pipe-shaped part 2 are both Al-based. Both may be made of the same Al-based material, or may have a slightly different composition.
It may be an l-type material. Through hole 1 of flange-shaped part 1
The protrusion 13 is formed coaxially in a ring shape on the inner peripheral portion 10f of the zero. The protrusion 13 protrudes radially inward at the inner peripheral portion 10f. The projection 13 has a shaft end surface 13a, an inner peripheral surface 13c, and a shaft end surface 13e. Shaft end faces 13a, 13e
Is along the direction perpendicular to the axis. The inner peripheral surface 13c extends along the axial direction. Therefore, the cross section of the projection 13 has a square shape.

As can be understood from FIG. 2, when the pipe-like part 2 is fitted into the through hole 10 of the flange-like part 1, the height of the inner peripheral surface 13c of the projection 13 is equal to that of the pipe-like part 2.
Is lower than the height of the inner peripheral portion 2c. Fig. 1
As can be understood from FIG. 2, the shaft end 2f of the pipe-shaped part 2 is fitted into the through hole 10 of the flange-shaped part 1, and the shaft end 2f of the pipe-shaped part 2 is brought into contact with the shaft end face 13a of the projection 13 and butt. . In this state, the tip of the tungsten electrode 40 of the TIG torch, that is, the welding torch 4 is brought close to the protrusion 13 to generate an arc, and the welding filler 5 functioning as an Al-based round bar-shaped additive material is supplied at a predetermined supply rate. The projection 13 is melted while being supplied in the direction of the arrow R1. In this TIG welding, alternating current is usually used, but direct current may be used. In the case of direct current, in general, the + pole can be on the side of the material to be welded, and the − pole can be on the TIG torch side. The welding is performed while supplying an inert gas to the welded portion.

Thus, the inner peripheral portion 10 of the flange-shaped part 1
The fillet welding between the shaft f and the shaft end 2f of the pipe-shaped part 2 is performed. The tip of the welding filler 5 is melted and solidified to form a projection 13.
At the same time, the overlay 7 is formed. FIG. 3 schematically shows an example of a cross section near the built-up portion 7 after welding is completed. As can be seen from FIG. 3, the shaft end 2 of the pipe-shaped part 2
f, the projections 13, the welding filler 5, and the inner peripheral portion 10f of the flange-shaped part 1 are fused to form the overlay portion 7. The shaft end 2f, the protrusion 13, the welding filler 5, and the inner peripheral portion 10f are each Al-based, and each melting point region is close to each other.
The integrity of each welding element is improved.

According to the present embodiment, as shown in FIG. 3, the surface 7f of the build-up portion 7 preferably has an arc-shaped convex cross section. However, depending on the case, although not shown, the surface 7f of the built-up portion 7 can be formed in a fillet shape, that is, in a concave shape with a circular cross section, or in an intermediate state between a convex shape with a circular cross section and a concave shape with a circular cross section.

The build-up portion 7 is formed in a ring shape so as to make one round of the through hole 10 in the circumferential direction. The welding filler 5 may be made of the same material as the protrusion 13 or may be made of the same material. Taking into account the test results performed by the inventor, the values can be set in the following ranges. That is, the thickness of the pipe-shaped part 2 is t
Then, the height H of the protrusion 13 is (1/3) t to (3 /
4) It can be set to t, and the width L of the protrusion 13 is (）) t ~
(2/3) t can be set. However, it is not limited to this range depending on the use.

According to a test conducted by the present inventor, when the pipe-shaped part 2 was welded with the thickness t of 3 mm and the welding filler 5 supplied without the projection 13, the total welding length was 5 mm.
Out of 00 mm, the poor welding portion was 65 mm. But,
Projection 13 (height H = (（) t = 1 mm, width L =
When (1.5 / 3) t = 1.5 mm) was formed and welded, there was no poor welding.

As can be understood from the above description, according to the present embodiment, since the projections 13 are melted while the welding filler 5 is being supplied, even when the supply of the welding filler 5 tends to be delayed, the buildup is performed. The build-up amount of the portion 7 is easily secured. In other words, even if the supply amount of the welding filler 5 is reduced, the projection 13 substantially plays the role of the welding filler 5, which is advantageous for suppressing the occurrence of welding defects due to the shortage of the welding filler 5. .

Further, according to the present embodiment, as can be understood from FIG. 2, the height H of the projection 13 is set smaller than the thickness t of the pipe-shaped part 2. That is, as can be understood from FIG. 2, the height of the inner peripheral surface 13 c of the projection 13 is lower than the height of the inner peripheral portion 2 c of the pipe-shaped component 2. Therefore, when the build-up portion 7 in which the projections 13 and the like are melt-solidified together with the welding filler 5 is formed, the build-up portion 7 protrudes excessively in the radially inner direction than the inner peripheral portion 2 c of the pipe-shaped component 2. It is advantageous to control. Therefore, when a fluid such as air passes through the pipe hole 2 w of the pipe-shaped part 2, it is possible to suppress the excessively protruding overlay portion 7 from becoming a large obstacle to the flow of the fluid.

Further, according to the present embodiment, the projection 13 also has a function of positioning the pipe-shaped part 2, which is advantageous for securing welding accuracy. That is, the projections 13 can have a positioning function before welding, and can have a replenishment function to replenish the shortage of the welding filler 5 after welding. The flange-shaped part 1 is thick and has a relatively large heat capacity. Accordingly, welding is not always easy because the flange-shaped part 1 has a high heat transfer. In this respect, in the present embodiment, since the small-volume projections 13 are formed on the flange-shaped part 1 having a large heat capacity, the heat capacity of the projections 13 can be suppressed, so that excessive heat transfer during welding is suppressed, It becomes easier to balance the heat of the welded part. Therefore, it is advantageous for stabilizing the molten pool during TIG welding.

Incidentally, the flange-like part 1 and the pipe-like part 2 are suitable for use as a fluid device through which a fluid such as air passes. In this case, when the surface 7f of the build-up portion 7 has an arc-shaped concave cross-section, and when a fluid such as air flows in the direction of the arrow X1, when the fluid passes through the build-up portion 7, the flow path cross-sectional area is increased. Increases rapidly, which is not preferable. In this regard, according to the present embodiment, since the projections 13 are melted while the welding filler 5 is being supplied, as can be understood from FIG. 3, even when the supply of the welding filler 5 tends to be delayed, the build-up portion is formed. 7 is easily secured. Therefore, the shortage of the build-up amount is corrected, and the surface 7f of the build-up portion 7 tends to be slightly convex in section.

Therefore, when a fluid such as air flows in the direction of the arrow X1 and the fluid passes through the build-up portion 7, it is advantageous in reducing a sudden increase in the flow path cross-sectional area. Therefore, it is advantageous for smoothing the flow of the fluid. Therefore, the product of the present embodiment is suitable for use in a fluid device such as an intake manifold for an intake system or an exhaust manifold for an exhaust system. (Application Example) FIG. 5 shows an example in which the invention is applied to an intake manifold functioning as a fluid device mounted on an internal combustion engine of a vehicle. As shown in FIG. 5, a plurality of Al pipe-shaped parts 2 connected to the surge tank 9 are connected to the through holes 10 of the flange-shaped part 1 by welding, respectively. The flange-like part 1 is connected to an internal combustion engine. View W1 shown in FIG.
-W1 corresponds to FIG. Further, the present embodiment can be applied to an exhaust manifold provided in an internal combustion engine.

(Other Example) In the above embodiment, the projection 13 has a rectangular cross section. However, the present invention is not limited to this, and the projection 13 may have a multi-stage cross section as shown in FIG. In addition, as shown in FIG. 4B, the projection 13 may have a substantially right triangular cross section. In the above embodiment, TI
Although applied to G welding, MIG welding may be used in some cases, and other welding methods such as covered arc welding may be used.

(Supplementary Note) The following technical idea can be understood from the above description. ○ Using a flange-shaped part with a through-hole and a pipe-shaped part with a shaft end, fillet welding with the inner peripheral part of the through-hole of the flange-shaped part and the shaft end of the pipe-shaped part overlapped Fillet welding method, in which a projection projecting radially inward is formed in the inner peripheral portion of the through hole of the flange-shaped part in advance, and the shaft end of the pipe-shaped part is applied to the projection to supply the welding filler. A fillet welding method for a structural product, comprising: welding a projection while melting an inner peripheral portion of a through hole of a flange-shaped component and a shaft end of a pipe-shaped component. The fillet welding method according to claim 1, wherein the welding filler and the projection are made of the same material or the same material. Since the melting point regions are close to each other, it is easy to secure the integrally welded connection between the first member and the second member. The second member is a pipe-shaped part, and the height of the projection is set smaller than the thickness of the pipe-shaped part.
Fillet welding method according to the above. According to this, it is advantageous to suppress the overlaid portion from protruding excessively in the radial direction of the pipe-shaped component.

[0023]

According to the method of the present invention, the projections are melted while the welding filler is being supplied. Therefore, even when the supply of the welding filler is liable to be delayed, the amount of the overlaid portion can be easily secured. . In other words, even when the supply amount of the welding filler is reduced, the projection substantially plays a role of the welding filler, which is advantageous for suppressing the occurrence of poor welding, and is advantageous for securing welding strength.

Further, according to the method of the present invention, since the projection is formed on the flange-shaped part, the projection is likely to be made of the same material or the same material as the flange-shaped part. Therefore, it is advantageous for suppressing poor welding such as cracks. Furthermore, according to the method of the present invention, the projection also has the function of positioning the second member such as a pipe-shaped part, which is advantageous for securing welding accuracy.
That is, the projection can have a positioning function before welding and can have a replenishment function of replenishing the welding filler after welding.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a pipe-shaped part is fitted into a through-hole of a flange-shaped part and is welded.

FIG. 2 is a cross-sectional view showing a state in which a shaft end of a pipe-shaped part is applied to a projection.

FIG. 3 is a configuration diagram schematically showing a state in which the surface of a cladding portion has a circular-arc convex shape.

FIG. 4 is a configuration diagram showing a modified example of a projection.

FIG. 5 is a perspective view of an intake manifold.

FIG. 6 is a cross-sectional view showing a state in which a pipe-shaped part is fitted into a through-hole of a flange-shaped part and is welded according to a conventional technique.

FIG. 7 is a cross-sectional view showing a welding defect according to the related art.

FIG. 8 is a cross-sectional view showing a state in which a pipe-shaped part is fitted into a through-hole of a flange-shaped part according to a conventional technique.

[Explanation of symbols]

In the figure, 1 is a flange-shaped component (first member), 2 is a pipe-shaped component (second member), 10 is a through hole, 10f is an inner peripheral portion (welded portion), and 2f is a shaft end portion (coated portion). (Welded portion), 13 is a protrusion, 5 is a weld filler, and 7 is a built-up portion.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masato Asai 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (1)

[Claims] A first member having a portion to be welded and a second member having a portion to be welded, wherein a portion to be welded of the first member and a portion to be welded of the second member are connected; A fillet welding method in which fillet welding is performed in an overlapped state, wherein a projection is formed in advance on a portion to be welded of the first member,
Applying the welded portion of the second member to the protrusion, melting the protrusion while supplying a welding filler, and welding the welded portion of the first member and the welded portion of the second member. Fillet welding method characterized by performing.