JP2008183569A - Structure of fillet welded portion, and method of fillet welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a fillet welded portion, which structure can give a smooth shape to the toe portion of weld so as to reduce the stress concentration at a low cost, and can secure a braking torque, and also can achieve high durability in braking at a low cost by applying the fillet welding of a brake flange to an axle case, and further to provide a method of the fillet welding. <P>SOLUTION: The structure of the fillet welding portion is configured by fillet-welding a second member 4 to a first member 3. A groove 10 is formed on a part or the whole of the portion to be fillet-welded on at least one member between the first member 3 and the second member 4. The groove 10 is filled with weld metal in welding in a manner that the leg length "a" of a weld bead 7 is larger than the width X of the groove 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a fillet weld and a fillet welding method in which the shape of a weld toe is smoothed to reduce stress concentration.

  As shown in FIG. 8 (a), a vehicle axle case 1 includes a differential housing portion 2 in which a differential mechanism is housed, and a cylindrical axle housing portion 3 that is arranged on the left and right sides of the axle housing portion 3 and houses the axle. ing. The left and right axle housing portions 3 are fitted with annular plate-like brake flanges 4 for mounting brakes, respectively, and at least one side surface of each brake flange 4 extends along the circumferential direction of the outer peripheral surface of the axle housing portion 3. The fillet is welded.

  The axle case 1 is provided with suspension springs 5 at left and right locations closer to the center of the vehicle width than the mounting portions of the brake flanges 4, and at both ends, that is, outside the vehicle width of the mounting portions of the brake flange 4. A tire 6 is disposed. Therefore, a tensile stress is generated on the lower surface side of the axle case 1 due to a bending moment generated by the suspension force from the spring 5 and the road surface reaction force from the tire 6. Therefore, a large stress concentration (tensile stress concentration) occurs in the fillet welded portion between the axle housing portion 3 and the brake flange 4 on the lower surface side of the axle case 1, and a crack occurs in the axle case 1 starting from the fillet welded portion. There is a possibility of doing.

  Therefore, the brake flange 4 is not welded to the axle housing part 3 of the axle case 1 over the entire circumference, and the range of a predetermined angle (for example, 90 to 120 degrees) on the lower surface side of the axle housing part 3 is not welded without fillet welding. A technique is known that keeps welding and avoids stress concentration at the fillet weld on the lower surface side. However, in this method, since the welding length of the brake flange 4 to the axle housing portion 3 is reduced, the support capability of the braking torque applied to the brake flange 4 during braking is lowered according to the reduction of the welding length.

Therefore, as a countermeasure, as shown in FIG. 9 (b), a technique is known in which CF welding using a wire with a flex is used and the brake flange 4 is fillet welded to the axle housing portion 3 including the lower surface side. ing. According to this method, since the weld length can be increased, it is possible to ensure the support capability of the braking torque applied to the brake housing 4, and by CF welding (flexed wire), CO using a general solid wire shown in FIG. _{2 Since} the shape of the weld toe 8 of the weld bead 7 is smoother than the fillet weld of the brake flange 4 to the axle housing 3 by welding, the weld toe 8 on the lower surface side of the axle housing 3 Stress concentration is reduced.

Also, a method using an air tag shown in FIG. 9C has been put into practical use. In this air tagging method, the brake flange 4 is welded to the axle housing part 3 including the lower surface side by fillet welding (CO ₂ welding using a solid wire), and then the tensile bending stress on the lower surface side of the axle housing part 3 is measured. A plurality of needle-like impacting bodies 9 are struck in the vicinity of the weld toe portion 8 in a severe predetermined range so as to vibrate with the force of high-pressure air. According to this method, since the weld length can be increased, it is possible to secure the supporting ability of the braking torque applied to the brake housing 4 and the portion struck by the needle-like impacting body 9 (the tensile bending stress on the lower surface side of the axle housing portion 3 is severe. The surface of the portion) is hardened and the strength is improved, and the compressive residual stress is generated in the tensile stress concentration portion, so that the stress is offset.

JP-A-8-108882

  By the way, in the technique by CF welding using a wire with a flex, the cost of the welding wire is higher than that of a general solid wire, and the scale of the surface of the weld bead 7 is covered with the scale so that the scale is removed. It is necessary to increase the cost, increase the number of work steps, and deteriorate the work environment. Further, in the method using the air chisel, there is a problem that the processing time after welding is increased and the working environment is deteriorated due to the impact sound.

  The object of the present invention created in view of the above circumstances is to be applied to the fillet welding of the brake flange to the axle case at a low cost and the shape of the weld toe becomes a smooth shape capable of reducing stress concentration. Thus, it is an object of the present invention to provide a fillet welded structure and fillet welding method capable of maintaining both braking torque retention during braking and high durability at low cost.

  In order to solve the above-mentioned problem, a first invention is a structure of a fillet welded portion formed by fillet welding a second member to a first member, and includes the first member and the second member. A groove along the welding direction is formed in a part or all of the fillet welded portion of at least one of the members, and the groove is filled with a weld metal during welding so that the leg length of the weld bead is larger than the width of the groove. It is made by welding.

  The width of the groove is preferably ¼ or more of the leg length, and the depth of the groove is preferably approximately ½ of the width of the groove.

  According to a second aspect of the present invention, an annular plate-like brake flange for mounting a brake is fitted into a cylindrical axle housing portion of a vehicle axle case, and fillet welded in the circumferential direction of the axle housing portion. A fillet welded structure is formed, and a groove along the welding direction is formed in a part or all of the fillet welded portion of at least one member of the axle housing part and the brake flange, during welding. The groove is filled with a weld metal and welded so that the leg length of the weld bead is larger than the width of the groove.

  It is preferable that the groove is formed on the outer peripheral surface of the axle housing portion on the vehicle lower side.

  It is preferable that the groove is formed in a range of at least 60 degrees on the outer peripheral surface of the axle housing portion on the vehicle lower side.

  The width of the groove is preferably ¼ or more of the leg length, and the depth of the groove is preferably approximately ½ of the width of the groove.

  It is preferable that the groove is formed only on the outer peripheral surface of the axle housing portion closer to the vehicle width center than the brake flange.

  The third invention is a method of fillet welding the second member to the first member, wherein the fillet weld of at least one of the first member and the second member Grooves along the welding direction are formed in part or all, and during welding, the grooves are filled with a weld metal, and welding is performed so that the leg length of the weld bead is larger than the width of the groove.

  According to a fourth aspect of the present invention, an annular plate-like brake flange for mounting a brake is fitted to a cylindrical axle housing portion of an axle case for a vehicle, and fillet welding is performed in the circumferential direction of the axle housing portion. A method of forming a groove along a welding direction in a part or all of a fillet welded portion of at least one member of the axle housing portion and the brake flange, and filling the groove with a weld metal during welding. Then, welding is performed so that the leg length of the weld bead is larger than the width of the groove.

  According to a fifth aspect of the present invention, when a situation where stress is concentrated on a part of the weld line of the fillet welded bead is formed, a groove along the weld line is formed in the base material so as to include at least the part. The groove is filled with a weld metal, and fillet welding is performed so that the leg length of the weld bead is equal to or greater than the width of the groove.

  According to the fillet weld structure and fillet welding method according to the present invention, the shape of the weld toe becomes a smooth shape that can reduce the stress concentration, and can be used for fillet welding of the brake flange to the axle case. By applying it, it is possible to achieve both maintenance of braking torque of the brake and high durability at a low cost.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1A, FIG. 1B, FIG. 8A, and FIG. 8B, a brake is applied to the outer peripheral surface of the cylindrical axle housing portion 3 of the axle case 1 for a vehicle. An annular plate-like brake flange 4 to be attached is fitted, and the brake flange 4 is fillet welded to the outer peripheral surface of the axle housing portion 3 along the circumferential direction. In this embodiment, fillet welding is performed only on the vehicle width center side with respect to the brake flange 4 of the axle housing portion 3 in consideration of the mounting property of the brake parts, and a solid wire is used in consideration of cost reduction. General CO ₂ welding is employed.

  A groove 10 is formed in a portion of the weld line on the outer peripheral surface of the axle housing portion 3 along the circumferential direction in a part of the weld line. Specifically, the groove 10 is formed in a vehicle lower side portion of the outer peripheral surface of the axle housing portion 3, and in particular, a range 10 a (see FIG. 8B) of at least 60 degrees of the vehicle lower portion, that is, the axle housing portion. 3 is formed in a range 10a of at least 30 degrees left and right across a vertical line from the center. Here, “the groove 10 is formed in the range 10a of at least 60 degrees” means that the groove 10 is necessarily formed in the above-described range 10a of 60 degrees, and the groove 10 is also formed in the range exceeding 60 degrees. It means not to disturb.

  In this embodiment, the brake flange 4 is fillet welded over the entire circumference of the outer peripheral surface of the axle housing portion 3, and 60 ° of the portion of the welded portion of the outer peripheral surface of the axle housing portion 3 on the vehicle lower side. The groove 10 is formed only in the range 10a. However, fillet welding may not be performed over the entire circumference, and the groove 10 may be formed beyond the range 10a of 60 degrees. In this embodiment, the axle housing part 3 is composed of two divided parts in which a cylinder is substantially divided in half along the center line thereof, and the groove 10 is simultaneously pressed by a press die when the divided parts are press-molded to form an arc shape (substantially). (Semicircle). Therefore, the additional process for shape | molding the groove | channel 10 is unnecessary. However, the cross section of the groove 10 may be triangular or rectangular, and the groove 10 may be formed by cutting.

The groove 10 is filled with a weld metal when the brake flange 4 is fillet welded to the axle housing portion 3 (general CO ₂ welding using a solid wire), and the leg length a of the weld bead 7 is the width of the groove 10. The weld bead 7 is formed so as to be larger than X. As described above, since the weld metal is accommodated so as to fit inside the groove 10 while melting the inner surface of the groove 10, the volume of the weld metal per unit length is the same as compared with the case where there is no groove 10. The surface 7a of the weld bead 7 is unlikely to have a convex shape, and even if it has a concave shape, a planar shape, or a convex shape, the degree of convexity is reduced. That is, even when CO ₂ welding using an inexpensive solid wire is employed, the same weld bead 7 shape as that obtained when CF welding using an expensive flux-cored wire (see FIG. 9B) is employed is obtained. It is done.

  As a result, the flank angle α of the weld toe part 8 of the weld bead 7 is increased at a very low cost, and the weld toe part 8 is smoothly connected to the base material (axle housing part 3). Stress concentration in the portion 8 is reduced. That is, the shape of the weld toe portion 8 of the weld bead 7 of the brake flange 4 on the vehicle lower surface side of the axle housing portion 3 where tensile stress is concentrated in the axle case 1 becomes smooth in a range 10a of 60 degrees on the vehicle lower surface side. , Stress concentration in the part is relaxed. Therefore, the occurrence of cracks due to stress concentration starting from the weld toe portion 8 on the vehicle lower surface side can be suppressed at low cost, and durability is improved. Further, since CF welding using a flux-cored wire is not adopted, the surface of the weld bead 7 is not covered with a scale, and problems such as an increase in work man-hours for removing the scale and a deterioration of the work environment arise. Absent.

Further, the groove 10 is filled with a weld metal during fillet welding, and the weld bead 7 is welded so that the leg length a is larger than the width X of the groove 10, thereby increasing the flank angle α as described above. Since the volume of the weld metal per unit length is sufficiently secured and the weld metal is sufficiently melted into the base material, high welding strength can be secured. Further, since welding is performed under the same welding conditions (voltage, welding speed, etc.) as conventional fillet welding (CO ₂ welding using a solid wire) except that the groove 10 is formed, the cost becomes low and Similar weld strength is obtained. In addition, in this embodiment, since the fillet weld is performed over the entire circumference of the outer peripheral surface of the axle housing portion 3, a long weld length is ensured. In this way, high welding strength can be obtained and a long welding length can be ensured, so that the support capability of the braking torque applied to the brake flange 4 during braking is increased and durability is improved.

That is, in this embodiment, in order to enhance the support capability of the braking torque applied to the brake flange 4 during braking, the brake flange 4 is fillet welded to the axle housing portion 3 including the lower surface side, and concentration of tensile stress is concentrated. Therefore, in order to reduce the stress concentration by smoothly connecting the shape of the weld toe portion 8 on the vehicle lower surface side of the weld bead 7 where the occurrence of cracks is a concern to the base material, a range 10a of 60 ° on the vehicle lower surface side. In addition, the groove 10 is formed on the surface, and fillet welding is performed by CO ₂ welding using an inexpensive solid wire. Thereby, the shape of the weld toe portion 8 is a low-cost and smooth shape that can reduce the stress concentration, and it is possible to achieve both maintenance of braking torque of the brake and high durability at low cost.

  The groove 10 does not need to be formed in the entire range of the welding length as described above, and is particularly in a severe range (a range in which stress concentration is remarkable), and the axle housing of the axle case 1 as in this embodiment. In the fillet welding of the brake flange 4 to the portion 3, a groove 10 is provided in a 60 ° range 10 a on the vehicle lower side of the axle housing portion 3, and the leg length a is filled with the groove 10 during fillet welding. By forming the weld bead 7 so as to be larger than the width X, a sufficient strength improvement effect (stress concentration relaxation effect) can be obtained. However, it is needless to say that the groove 10 may be formed over the entire range of the welding length, that is, the entire circumference of the outer peripheral surface of the axle housing portion 3.

  The technical premise of the present invention will be described below.

  In general, when the leg length a of the weld bead 7 is the same, the appearance of the fillet welded portion (weld bead 7) becomes a concave shape as the amount of deposited metal per unit length decreases, so that the weld toe portion 8 is formed. The shape is smoothly connected to the base metal, the flank angle α (see FIG. 2) formed by the surface of the weld metal and the base metal surface at the weld toe 8 is increased, and the stress concentration factor at the weld toe 8 is reduced. Is done.

To reduce the amount of deposited metal, the current can be reduced or the welding speed can be increased to reduce the heat input per unit weld length. However, by reducing the heat input, welding penetration and the effective throat thickness of the weld bead 7 are reduced. As a result, cracks and breakage from the weld root are caused, and there is a limit to increasing the flank angle α by reducing the amount of deposited metal by this method. In particular, in the case of CO ₂ welding where the welding material cost is low and the post-processing of welding is easy, a relatively large droplet falls from the welding wire to form a deposited metal, and the amount of deposited metal is reduced by the amount of slag. Since the cooling and solidification is fast, the weld bead 7 is likely to be a discontinuous weld bead 7 with uneven width and height, and the limit is narrower, so that it is more likely to be a more convex weld bead 7 (FIG. 9A). )reference).

  By the way, in FIG. 2, when the horizontal length and the vertical leg length a of the weld bead 7 of the two members (for example, the brake flange 4 and the axle housing portion 3) are equal and the surface of the weld bead 7 is substantially flat, The angle α is about 135 degrees (180 degrees-45 degrees). The inventor has found that when the amount of weld metal is increased by 50% and the weld bead 7 has a convex shape, the flank angle α is reduced by about 40 degrees, and conversely, the amount of weld metal is reduced by 50% and the weld bead 7 has a concave shape. Then, it was found that the flank angle α increases by about 40 degrees (see FIG. 3).

  FIG. 3 is an explanatory diagram showing the relationship between the deposition amount change rate (B / A) of the weld metal and the angle θ (θ = 180 degrees− (45 degrees + flank angle α)) correlated with the flank angle α. . FIG. 3 was obtained as follows. First, in FIG. 2, A is the leg length a in the horizontal direction of the weld bead 7, the leg length a in the vertical direction, and the volume of the flat portion of the surface, and B is the volume of the portion bulging from the surface or recessed from the surface. Volume. The following equation holds for the triangle XYZ in FIG.

sin θ = (√2a / 2) / R
Rewrite R = a / (√2 sin θ) (1)
A = 0.5a ² (2)
B = πR ² (2θ / 360) −0.5 (Rsinθ) (Rcosθ) × 2
= 0.5R ² (4πθ / 360) -0.5R ² sin2θ
= 0.5R ² ((4πθ / 360) −sin2θ)
Substituting equation (1) B = (0.25a ² / sin ² θ) × ((4πθ / 360) −sin 2θ) (3) From equations (2) and (3), B / A = (0 .5 / sin ² θ) × ((4πθ / 360) −sin 2θ) (4)
The graph of FIG. 3 is obtained from the equation (4). According to FIG. 3, when B / A is +0.5, that is, when a bulging portion B having a volume of 50% of A bulges on the surface of the base portion A, θ is about +40 degrees and flank. The angle α is reduced by about 40 degrees. Conversely, when B / A is −0.5, that is, when a dent B having a volume of 50% of A is recessed from the surface of the base A, θ is about −40 degrees and the flank angle α is It is about 40 degrees larger.

Here, as shown in FIG. 1A, at least one of the fillet welded members (the axle housing portion 3 in this embodiment) has a width X that is 1/4 or more of the leg length a within the range of the leg length a. Then, the groove 10 whose depth Y is approximately ½ of the width X is formed along the weld line. Then, the other member (brake flange 4) is fillet welded to the member (axle housing portion 3) by CO ₂ welding using a solid wire, and the groove 10 is welded as shown in FIG. 1 (b). By completely filling in, the appearance of the weld bead 7 with a less surface bulge or a recessed surface can be obtained as compared with the case without the groove 10.

  For example, as shown in FIG. 2, when a semicircular groove 10 having a width X of the groove 10 that is ½ of the leg length a of the weld bead 7 is disposed, the cross-sectional area of the groove 10 is such that the leg length a is two sides. Since about 20% of the area of the isosceles right triangle (base part A) is about 20% of the deposited metal is consumed to fill the groove 10, the flank angle α is increased by about 17 degrees according to FIG. In addition, the stress concentration at the weld toe 8 is alleviated, the occurrence of cracks from the weld toe 8 is suppressed, and the life can be greatly improved.

  Further, when the semicircular groove 10 whose width X is 1/4 of the leg length a of the weld bead 7 is disposed, the sectional area of the groove 10 is about 5% of the area of the base portion A. About 5% of the deposited metal is consumed to fill the groove 10 and the flank angle α is increased by about 4 degrees according to FIG. 3, but the width X of the groove 10 is half of the leg length a of the weld bead 7. When the circular groove 10 is arranged, the cross-sectional area of the groove 10 is about 3% of the area of the base portion A, so that about 3% of the deposited metal is consumed to fill the groove, and the flank angle is shown in FIG. α increases only about 3 degrees.

  Therefore, in order to ensure that the flank angle α is increased by at least about 4 degrees and obtain a certain degree of stress concentration relaxation effect, in the claims, the width X of the groove 10 is the leg length a of the weld bead 7. A claim is provided in which the depth Y of the groove 10 is approximately ½ of the width X of the groove 10.

  Modified embodiments of the present invention are shown in FIGS.

  4 (a) and 4 (b), the groove 10 is provided not only on the vehicle width center side but also on the vehicle width end side with respect to the brake flange 4 of the axle housing portion 3 in the same manner. Only the point which formed the weld bead 7 not only on the side but also on the vehicle width end side is different from the previous embodiment, and the others are the same as in the previous embodiment. The width X1 of the groove 10 on the vehicle width center side is ¼ or more of the leg length a1, and the depth Y1 of the groove 10 is approximately ½ of the width X1 of the groove 10. The width X2 of the groove 10 on the vehicle width end side is not less than 1/4 of the leg length a2, and the depth Y2 of the groove 10 is approximately 1/2 of the groove width X2.

  5 (a) and 5 (b) differ from the first embodiment only in that the groove 10 is provided in the axle housing portion 3 and the brake flange 4 is similarly provided. This is the same as the embodiment. The width X3 of the groove 10 of the axle housing part 3 is ¼ or more of the leg length a3, and the depth Y3 of the groove 10 is substantially ½ of the width X3 of the groove 10. The width X4 of the groove 10 of the brake flange 4 is ¼ or more of the leg length a4, and the depth Y4 of the groove 10 is substantially ½ of the width X4 of the groove 10.

  6 (a) and 6 (b) are a combination of those shown in FIGS. 4 (a) and 4 (b) and those shown in FIGS. 5 (a) and 5 (b). It is. The width X5 of the groove 10 is ¼ or more of the leg length a5, and the depth Y5 of the groove 10 is approximately ½ of the width X5 of the groove 10. The width X6 of the groove 10 is ¼ or more of the leg length a6, and the depth Y6 of the groove 10 is substantially ½ of the width X6 of the groove 10. The width X7 of the groove 10 is ¼ or more of the leg length a7, and the depth Y7 of the groove 10 is substantially ½ of the width X7 of the groove 10. The width X8 of the groove 10 is ¼ or more of the leg length a8, and the depth Y8 of the groove 10 is approximately ½ of the width X8 of the groove 10.

  7 (a) and FIG. 7 (b) show the groove 10 having a triangular or rectangular cross section. The groove 10 is formed by cutting or coining instead of pressing, and is opposite to the groove 10. The side protrusion is eliminated.

  In these modified embodiments, the same operational effects as the first embodiment can be obtained.

The present invention is not limited to fillet welding between the axle housing portion 3 and the brake flange 4 in the axle case 1. That is, if stress (tensile or compression) is expected to be concentrated on a portion along the weld line of the fillet welded bead, the groove along the weld line should be formed so as to include at least the portion. It is applied to various fillet welding by forming fillet and filling the groove with weld metal and fillet welding (cheap CO ₂ welding etc.) so that the leg length of the weld bead is equal to or larger than the groove width. it can.

It is explanatory drawing which shows the structure of the fillet weld part which concerns on suitable embodiment of this invention, and a fillet welding method, (a) is sectional drawing before welding of an axle housing part and a brake flange, (b) is after welding. FIG. It is an expanded sectional view of a fillet weld part. It is explanatory drawing which shows the correlation with the angle (theta) correlated with the amount of welding metals, and flank angle (alpha). It is explanatory drawing which shows the structure of the fillet weld part which concerns on deformation | transformation embodiment of this invention, and a fillet welding method, (a) is sectional drawing before welding of an axle housing part and a brake flange, (b) is after welding. FIG. It is explanatory drawing which shows the structure of the fillet weld part which concerns on another deformation | transformation embodiment of this invention, and a fillet weld method, (a) is sectional drawing before welding of an axle housing part and a brake flange, (b) is welding. It is the same sectional drawing after. It is explanatory drawing which shows the structure of the fillet weld part which concerns on another deformation | transformation embodiment of this invention, and a fillet weld method, (a) is sectional drawing before welding of an axle housing part and a brake flange, (b) is It is the same sectional view after welding. It is explanatory drawing which shows the structure of the fillet weld part and fillet weld method concerning another modified embodiment of this invention, (a) is a thing with a cross section of a groove | channel, (b) is a cross section of a groove | channel. Indicates a rectangular object. It is explanatory drawing of an axle case, (a) is a front view of an axle case, (b) is the side view. Is an explanatory view showing a conventional example, (a) shows the cross sectional view though the brake flange and CO ₂ welded to the axle housing portion, (b) similarly CF welded Although cross-sectional view, (c) likewise CO ₂ welding The cross section which gave air chisel to what was done is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axle case 3 Axle housing part 4 Brake flange 7 Weld bead 8 Weld toe part 10 Groove 10a Range a Weld bead leg length X Groove width Y Groove depth

Claims (10)

It is a structure of a fillet weld portion formed by fillet welding a second member to a first member,
A groove along the welding direction is formed in a part or all of the fillet welded portion of at least one of the first member and the second member, and the weld bead is filled with a weld metal during welding. The fillet welded structure is characterized in that it is welded so that its leg length is larger than the width of the groove.   The fillet welded structure according to claim 1, wherein the width of the groove is ¼ or more of the leg length, and the depth of the groove is approximately ½ of the width of the groove. Structure of fillet welded portion formed by fitting an annular plate-like brake flange for mounting a brake to a cylindrical axle housing portion of an axle case for a vehicle and performing fillet welding in the circumferential direction of the axle housing portion Because
A groove along the welding direction is formed in a part or all of the fillet welded portion of at least one member of the axle housing part and the brake flange, and the groove is filled with a weld metal at the time of welding. A fillet welded structure, wherein the welded portion is welded so as to be larger than the width of the groove.   The fillet welded structure according to claim 3, wherein the groove is formed on an outer peripheral surface of the axle housing portion on the vehicle lower side.   5. The fillet welded structure according to claim 4, wherein the groove is formed in a range of at least 60 degrees on the outer peripheral surface of the axle housing portion on the vehicle lower side.   The structure of the fillet welded portion according to any one of claims 3 to 5, wherein the width of the groove is ¼ or more of the leg length, and the depth of the groove is approximately ½ of the width of the groove.   The fillet welded structure according to any one of claims 3 to 6, wherein the groove is formed only on the outer peripheral surface of the axle housing portion closer to the vehicle width center than the brake flange. A method of fillet welding a second member to a first member,
A groove along the welding direction is formed in a part or all of the fillet welded portion of at least one of the first member and the second member, and the weld bead is filled with a weld metal during welding. The fillet welding method is characterized in that welding is performed such that the leg length of the metal is larger than the width of the groove. An annular plate-like brake flange for mounting a brake is fitted to a cylindrical axle housing portion of a vehicle axle case, and fillet welding is performed in the circumferential direction of the axle housing portion,
A groove along the welding direction is formed in a part or all of the fillet welded portion of at least one member of the axle housing part and the brake flange, and the groove is filled with a weld metal at the time of welding. The fillet welding method is characterized in that welding is performed so as to be larger than the width of the groove.   When stress is expected to be concentrated on a part of the weld line of the fillet welded bead, a groove along the weld line is formed in the base material so as to include at least the part, and the groove is welded. A fillet welding method characterized in that fillet welding is performed so that the leg length of the weld bead is equal to or greater than the width of the groove by filling with metal.

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