KR100494016B1 - A welding wire assembly of layers and method for laying it - Google Patents

Abstract

According to the present invention, the ratio (V ₁ ) of the apparent volume (V ₀ ) of the laminated wire-laminated welding wire stack to the actual volume (V ₁ ) of the laminated wire-laminated welding wires while being eccentric in a continuous spiral loop (V ₁ ). / V ₀ ) provides a welding wire laminate, characterized in that 0.4-0.6.

In addition, the present invention comprises the steps of: continuously drawing a straight line between the tension roller and the corresponding groove of the plurality of roller bearings from the step of supplying a welding wire; Supplying a welding wire drawn in a straight line to a storage container; Allowing the welding wire to naturally fall into the receiving container while forming a spiral continuous loop; Rotating the receiving container while giving a predetermined period of impact or vibration so that the spiral continuous loop is unevenly spread and stacked; Gradually lowering the storage container according to the stacking amount of the welding wire; And the ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminate of the welding wire finally laminated and stored in the container to the actual volume (V ₁ ) of the welding wire laminated and stored is 0.4-0.6. It provides a welding wire lamination method comprising the step of.

Description

Laminated body of large-capacity welding wire and lamination method {A WELDING WIRE ASSEMBLY OF LAYERS AND METHOD FOR LAYING IT}

The present invention relates to a fail pack in which a welding wire is eccentrically formed into a continuous loop in a large-capacity container. More specifically, the welding wire is laminated and stored while forming an eccentricity into a continuous loop. A laminate of large-capacity welding wire in which the ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the welding wire laminate to the actual volume (V ₁ ) of the laminated welding wire is finally 0.4-0.6. And a lamination method thereof.

In general, welding wires housed in a large-capacity container are forcibly twisted to form a small diameter loop and are eccentric so that the inversion and small diameter of the torsional stress are reduced. There is a problem that the welding wire is tangled up by a spring back force to be restored from the loop of the loop.

For this reason, conventionally, a circular pressing member is mounted in a container to prevent the welding wire from jumping out, but it is not sufficient to solve the problem of several wires being drawn or entangled at one time.

On the other hand, Japanese Unexamined Patent Application Publication No. 3-35023 describes a method of forming a welding wire having a small variation in tensile strength by heat treatment to form a small loop, thereby reducing the variation in the loop length. I tried to solve the tangle by presenting.

By the way, the publication was somewhat effective in terms of controlling the stiffness of the welding wire by reducing the variation in tensile strength, but as the welding wire softened by heat treatment was formed into a small diameter loop, The plastic deformation easily occurs, and the plastically deformed loop has a smaller diameter and is concentrated in the center of the stack so that the stack surface is not smooth. When using the pressing member or the like for drawing, the laminate was scattered or entangled.

In addition, when withdrawing the welding wire, there is a problem that it is not drawn out while being completely released from the loop, and is drawn out while maintaining the loop shape to some extent, thereby further adding entanglement.

On the other hand, in Japanese Patent Laid-Open No. 9-323120, in order to solve the problem that the welding wires are concentrated in the center of the laminate and the lamination surface is not smoothed, a magnet is attached to the outer wall of the storage container when the welding wire is laminated and stored. The loops were stacked in such a way that they were pulled out to the inner wall of the container by the attraction force of the magnet, but fundamental entanglement was not solved.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to provide a laminated body of a large-capacity welding wire and a method of laminating the same, so that the welding wires stacked and stored in the large-capacity container are not tangled with each other. It is done.

In order to achieve the above object, the present invention provides a welded wire laminate stacked and received while forming an eccentric in a spiral continuous loop in a large-capacity container, while forming an eccentric in the spiral continuous loop. The welding wire lamination characterized in that the ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminated and laminated welding wire laminate to the actual volume (V ₁ ) of the laminated and welded welding wire is 0.4-0.6. By providing a sieve.

 And, in a lamination method in which welding wires are laminated in a large volume container in an eccentric continuous loop, from the step of supplying the welding wires, between the tension roller and the corresponding groove of the plurality of roller bearings. Continuously drawing to maintain a straight line; Supplying a welding wire drawn in a straight line to a storage container; Allowing the welding wire to fall naturally into the storage container while forming a spiral continuous loop; Rotating the storage container while giving a predetermined period of impact or vibration so that the spiral continuous loop is unevenly spread evenly stacked; And, gradually lowering the storage container according to the amount of the welding wire Including;

The ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminate of the welding wire finally laminated and stored in the container to the actual volume (V ₁ ) of the welding wire received and laminated is 0.4-0.6. By providing a welding wire lamination method characterized in that it comprises.

EMBODIMENT OF THE INVENTION Hereinafter, the welding wire laminated body and lamination method of this invention are demonstrated in detail according to drawing.

First, the welding wire laminate of the present invention has a ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminate and the actual volume (V ₁ ) of the welding wire laminatedly stored is 0.4-0.6. It features.

In general, a laminate stacked and stored in a large-capacity container has a remarkably large volume with respect to its weight, and the difference is large for each laminate. This is due to the uneven size and position of the loops constituting the laminate, which increases the space in the laminate.

That is, when the welding wire constituting the laminate is eccentric in a spiral continuous loop, the size of the loop is too large or small, and the spacing between the loops is too wide or the loop is formed. If the stack is stacked without gaps between the loops, the volume is increased. In addition, even if the size of the loop and the distance between the loops are not constant, the volume of the laminate increases. On the other hand, if the size of the loop is too large or the gap is so narrow that the loops do not overlap each other, the volume of the stack is reduced.

By the way, if the volume of the laminate is too large, a problem in handling will naturally arise, but when pulling out the welding wire from the laminate, the adjacent loops are intercepted and pulled out, eventually becoming tangled. In addition, if the volume of the laminate is too small, there is an advantage in handling, but the same is true for the closed end that is entangled by interfering with the adjacent loop. Moreover, when the size of the loop and the distance between the loops are not constant, the problem of dragging out of an adjacent loop may be very serious when the stack volume is increased.

Therefore, the problem of entanglement is prevented from adjusting the size of the loop and its spacing appropriately. Therefore, a laminate in which the size and spacing of the loops are properly adjusted can be obtained from a laminate in which the packed density is appropriately dense. This density is the apparent density of the laminate ( ) And the actual density of laminated welded wire ( Of rain )from Relationship is established.

Where V ₀ is the apparent volume of the laminate (cross-sectional area X height of the laminate), V ₁ is the actual volume of the laminate (cross-sectional area X length of the welding wire constituting the laminate), and W is laminated storage welding In the above, the apparent volume V ₀ of the laminate is (cross-sectional area X height of the laminate), which is shown in FIG. 5, π (D ₁ ² -D ₂ ² ) X h / 4, where D ₁ is the inner diameter of the container, D ₂ is the inner diameter of the laminate, h is the height of the laminate, and the actual volume V ₁ of the laminate is the Cross-sectional area X length), which is πd ² X l / 4, as shown in FIG. 6, where d is the diameter of the wire and l is the length of the wire constituting the laminate. preferred that the apparent volume (V ₀₎ ratio (V ₁ / V ₀₎ of a substantive (V ₁₎ of the laminate for accommodating a welding wire is stacked in a controlled body configured to 0.4-0.6 . If the ratio is less than 0.4, the volume of the laminate becomes large. On the other hand, if the ratio exceeds 0.6, the volume of the laminate becomes excessively small.

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In addition, as shown in FIG. 6, the welding wire constituting the laminate has a hardness deviation ΔHv _R at the surface layer portion in the circumferential direction P1 within 45, and a hardness deviation at the surface layer portion in the longitudinal direction P2. It is preferable that (ΔHv _L ) is within 45, and the deviation between the above ΔHv _R and ΔHv _L is within 35.

If the welding wire forms a laminate in which the hardness deviation ΔHv _R at the surface layer portion exceeds 45 in the circumferential direction P1 of the welding wire in the large-capacity container, the working stress of the welding wire according to the hardness deviation is Appears differently. That is, compressive stress is applied to the surface layer portion having higher hardness, and tensile stress is applied to the surface layer portion having lower hardness. This working stress is because when the welding wire is drawn out from the laminate, the pulling output can be transferred to a subsequent loop to change the subsequent loop diameter to induce entanglement.

Moreover, if the hardness deviation (ΔHv _L ) in the surface layer portion exceeds 45 in the longitudinal direction P2 of the welding wire, this also causes a different working stress, but the welding wire is drawn out from the laminate. When the output is delivered to a subsequent loop, the subsequent loop is formed into an ellipse or pushed up to the inner wall of the storage container to cause entanglement.

In addition, if the deviation of ΔHv _R and ΔHv _L is greater than 35 to form a laminate, when the welding wire is drawn out from the laminate, the drawn welding wire is twisted to cause twisting, or the output is subsequently This is because a subsequent loop can bounce and bounce as it is passed to the loop.

In the hardness deviation, the additional stress acting from the surface during the drawing operation is removed to manufacture the welding wire, and the working stress is not consumed by plastic deformation, so that some stress on the strain exists as residual stress. When plastic deformation is caused by lattice defects or surface defects inside the wire, the elastic limit and plastic limit cannot be balanced from the surface, so the strain stress has continuity in the fresh direction and in the circumferential direction of the welding wire perpendicular to the fresh direction. Tensile and compressive stresses exhibit discontinuous behavior.

This discontinuity of the residual stress tends to stabilize by causing lattice deformation in response to tensile stress and compressive stress in order to maintain its own equilibrium, which may cause bending or warping deformation in the direction in which the compressive stress acts. .

In addition, in order to stack the welding wire in a large-capacity container, it is continuously drawn out so that a straight line is maintained between corresponding grooves of the plurality of roller bearings, and it is again wound up to naturally fall onto the loop, and the loop is dropped. Eccentricity is achieved while moving the landing point of the welding wire, but the welding wire causes a slight plastic deformation to generate the working stress of the surface layer portion. In addition, the welding wire laminated and housed in the loop while forming an eccentricity may be plastically deformed slightly again by elastic restoring force and its own load so that the working stress may disappear or be added depending on the loop size or the eccentric position. have.

Of course, the plastic behavior of the welding wires stacked and stacked on the loop may be minutely negligible, but the welding wires laminated and stored according to the loop size or the eccentric position may be formed by elastic restoring force and self load. There is also an increase in deformation. This phenomenon may be caused by the occurrence of entanglement at the lower portion than the upper portion of the laminate when the welding wire is drawn out of the laminate containing the stack and exhausted by the welding operation.

It is understood that the hardness value of the welding wire is continuously measured in the circumferential direction (P1) and the longitudinal direction (P2) of the welding wire at about 20 µm below the surface of the welding wire surface layer. It is possible to detect the working stress from the deviation. In the present invention, it is classified as tensile stress and compressive stress by using the deviation of hardness value obtained by applying the test load 200g using a micro-Vickers hardness tester, and whether the stress can be applied when drawing the welding wire from the laminate You can judge.

Therefore, in the present invention, the welding wire W forming the laminate has a hardness deviation ΔHv _R at the surface layer portion in the circumferential direction P1 within 45, and a hardness deviation ΔHv _L at the surface layer portion in the longitudinal direction P2. ) Is 45 or less, and the deviation between the ΔHv _R and ΔHv _L is preferably within 35.

And, if the hardness deviation of the welding wire constituting the laminate is properly controlled from the surface layer portion, it can work very effectively to flexibly feed in the bent welding cable during the welding operation.

Next, the lamination method of the present invention will be described in more detail with reference to the drawings.

In the welding wire lamination method of the present invention, the welding wire W is laminated in a large-capacity container 10 in an eccentric manner in a spiral continuous loop, and the welding wire W is drawn out from the laminate. It is a lamination method to prevent entanglement during welding and improve feeding performance.

In the lamination method of the present invention, as shown in FIG. 7, a step 100 is first performed in order to maintain a straight line between the tension roller and corresponding grooves of the plurality of roller bearings from the step of supplying a welding wire.

This is a continuous supply of a welding wire, the welding wire (W) is, as shown in Figure 6, the hardness deviation (ΔHv _R ) at the surface layer portion in the circumferential direction (P1) within 45, the longitudinal direction (P2) Therefore, it is preferable to select the welding wire W whose hardness deviation (ΔHv _L ) at the surface layer portion is within 45 and the deviation between the ΔHv _R and ΔHv _L is within 35, and about 5% is applied to the limited hardness deviation. It may be selected within a range not exceeding.

As shown in FIG. 1, the selected welding wire W is drawn and supplied by the supply roller 13 and the fixed roller 14 through the tension roller 11 and the plurality of roller bearings 12. At this time, the welding wire W drawn out by the rotation of the supply roller 13 sends an electrical signal to the supply source S and / or the supply roller 13 while the tension roller 11 moves up and down, thereby supplying the feed speed and drawing. It is effective in maintaining the balance of speed and appropriately adjusting the tension of the welding wire W.

In addition, the straightness of the welding wire (W) is formed while passing through the plurality of roller bearings 12, and this straightness effectively works to uniformly form a loop of the welding wire (W). do. In addition, the plurality of roller bearings 12 are zigzag as shown in FIG. 2, and the outer circumferential surface of the roller bearings 12 has a groove that matches the radius of the welding wire W or is somewhat larger. When the welding wire W is drawn out between these grooves 12a, the welding wire W forms a straightness while causing plasticity and elastic deformation.

Due to such plasticity and elastic deformation, the stress remaining in the surface layer portion of the welding wire W is changed. Therefore, the stress can be controlled by appropriately adjusting the interval of the roller bearing 12.

In addition, the welding wire W drawn out by the supply roller 13 and the fixed roller 14 also causes a change in stress. Particularly, when the pressing force of the fixed roller 14 is large, the welding wire is pressed and fired. Deformation causes the size of the loop to be large, small or distorted, and if the press force is small, the welding wire W is slipped in the feed roller 13, making it difficult to pull out, and the friction of slip Also causes a change in stress. Therefore, the stress can be controlled by appropriately controlling the surface roughness of the feed roller 13 and the fixed roller 14 and the pressing force of the fixed roller 14.

Then, a step (110) of supplying the welding wire drawn in a straight line to the storage container and a step (120) to naturally fall into the storage container while forming a continuous loop of the welding wire.

That is, as shown in FIGS. 1 and 3, the welding wire W is spirally wound on the guide drum 16 through the supply pipes 15 and 15 ′ to form a loop, and the formed loop ( Loop is supplied into the storage container 10 while falling naturally, wherein the supply pipes 15 and 15 'are rotated, or the guide drum 16 is rotated to guide the welding wire W to the guide drum 16. It is wound around to form a loop. However, as shown in FIG. 4 in the above process, when the guide drum 16 is rotated, the process drawn out and supplied by the supply roller 13 and the fixed roller 14 can be removed. That is, because the guide drum 16 is rotated to take out and supply the welding wire (W).

Also in this process, a slight stress change of the welding wire W occurs, because when the welding wire W is wound around the guide drum 16, the slight stress change can be given according to the tension of the winding. .

In addition, the loop is stacked in the storage container 10 while falling naturally. At this time, the storage container 10 is positioned below the guide drum 16, that is, above the rotary table 17, and the rotary table 17 is eccentric with the guide drum 16 to accommodate the storage container 10. Rotation of the natural fall by rotating (Loop) is eccentric as the position is moved in the opposite direction of rotation. However, the rotating table 17 is preferably rotated in the same direction as the rotating supply pipe (15, 15 ') or in the opposite direction of the rotating guide drum (16).

Further, next, the step 130 of rotating the storage container while giving a predetermined period of impact or vibration so that the spiral continuous loop is unfolded and evenly stacked while forming an eccentricity, and the storage container according to the stacking amount of the welding wire. Step 140 is gradually lowered, which is applied to the rotary table 17 by applying a periodic shock and vibration to form an eccentricity in the storage container 10 and the stacked loops (flat) evenly unfolded The laminated plate Ba is formed by the action and the eccentric unfolded loop (Loop) is formed of the laminate (B), the rotary table 17 is lowered so that the thickness of the laminate (Ba) is not thickened.

Here, the laminate (Ba) refers to a layer in which several strands of the wire loops eccentrically unfolded exist on one horizontal plane, and the laminate (B) is formed by gathering these multiple laminates (Ba). will be.

At this time, the lowering of the rotary table 17 is sensed by a sensor (not shown) is preferably lowered by the minimum thickness of the laminate (Ba). If the laminate Ba becomes thick, the number of times that the loops overlap with each other increases, which may cause entanglement because the apparent volume V ₀ of the laminate B increases.

Then, the ratio V of the apparent volume V ₀ of the laminated body B of the welding wire W finally laminated and stored in the container 10 to the actual volume V ₁ of the welding wire wired and stacked. ₁ / V ₀ ) is 0.4-0.6.

This, the rotational speed of the rotary table 17 is preferably controlled in conjunction with the rotational speed of the supply pipe (15, 15 ') and the rotational speed of the supply roller 13 or the guide drum 16, if, If the rotation speed of the supply roller 13 or the guide drum 16 is high, the supply amount of the welding wire W increases, and if the rotation speed of the supply pipes 15 and 15 'is fast, the size of the loop becomes small. If the rotation speed of the rotary table 17 is high, the interval between loops becomes large. Of course, each rotation slows the opposite way. Therefore, the ratio (V ₁ / V ₀ ) of the apparent volume V ₀ of the laminate B and the actual volume V ₁ of the welding wire W stored in the stack is changed.

Accordingly, the present invention relates to the apparent volume V ₀ of the laminate B of the welding wire W finally laminated and stored in the container 10 and the actual volume V ₁ of the welding wire laminated and stored. The rotational speed of the rotary table 17, the rotational speed of the supply pipes 15 and 15 'and the rotational speed of the supply roller 13 or the guide drum 16 are set such that the ratio V ₁ / V ₀ is 0.4-0.6. By appropriately adjusting, the uniform loop size and its spacing are maintained, and accordingly, the welding wire W can be pulled out from the laminate B to prevent entanglement during welding.

In addition, since the selected welding wire W can maintain a stress balance, the selected welding wire W plays an effective role in obtaining a laminate B having a constant loop size and a gap therebetween. However, since stress deformation is also caused by the self-load of the laminate B, the welding wire W may be taken out of the laminate B and entanglement may occur during welding.

Therefore, by uniformly controlling the size and spacing of the loops constituting the laminate B, the hardness deviation ΔHv _R at the surface layer portion in the circumferential direction P1 of the welding wire W is within 45 degrees. The hardness difference (ΔHv _L ) at the surface layer portion in the longitudinal direction P2 is 45 or less, and the deviation of the ΔHv _R and ΔHv _L is controlled or maintained to within 35, such that the welding wire W is laminated (B). Withdraw from) to prevent tangling during welding.

Hereinafter, the present invention will be described in more detail with reference to Examples.

(Example)

5, the stacked accommodated in the storage container 10, the layered product (B) prepared and substantive of the apparent volume (V ₀₎ and the laminate for an accommodating the welding wire with respect to the layered product (B) to (V ₁ The ratio (V ₁ / V ₀ ) of) is shown in Table 1 below.

In addition, by using a micro-Vickers hardness tester, a test load of 200 g is applied at about 20 µm directly below the surface of the welding wire surface layer portion, and the hardness is continuously measured in the circumferential direction (P1) and the longitudinal direction (P2) of the welding wire. Deviation was obtained and the results are shown in Table 1 below.

And the number of entanglement and feeding performance was investigated through the drawing test and welding work. The number of entanglement of the result was very good (◎ no tangling), excellent (O tangling once), normal (△ tangling 2-3 times), It was poor (more than 3 times of tangles), and the feeding performance was also evaluated as very good (◎), good (O), normal (△), and bad (Ｘ), and it is shown in Table 1 below. (At this time, the welding conditions were tested under normal conditions.)

division V ₁ / V ₀ ΔHv _R ΔHv _L ΔHv _RL Tangle count Supply performance Inventive Example 1 0.55 92 51 41 O Ｘ Inventive Example 2 0.42 38 77 39 O △ Inventive Example 3 0.51 43 9 34 O ◎ Inventive Example 4 0.59 15 47 32 ◎ O Inventive Example 5 0.47 8 11 3 ◎ ◎ Comparative Example 1 0.32 17 28 11 Ｘ ◎ Comparative Example 2 0.38 82 64 18 △ Ｘ Comparative Example 3 0.34 35 49 14 △ △ Comparative Example 4 0.29 107 64 43 Ｘ Ｘ Comparative Example 5 0.65 7 44 37 △ O

* ΔHv _RL in Table 1 is the deviation of ΔHv _R and ΔHv _L.

As shown in Table 1, the ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminate (B) to the actual volume (V ₁ ) of the welded wires laminated and satisfied satisfies the scope of the present invention. Inventive examples (1 to 5) showed little entanglement during withdrawal. On the other hand, Comparative Example (1-5) is off the range of the present invention non-(V ₁ / V ₀₎ of the apparent volume (V ₀₎ and the laminate substantial for the housing welding wire (V ₁₎ of the laminate The entanglement occurred from time to time in the laminated laminate (B), and the apparent volume (V ₀ ) also had a remarkable difference for each laminate.

In addition, the invention examples (3,5) and the comparative example (1) in which the stress on the surface portion of the welding wire were controlled so that the hardness deviation was within the scope of the present invention were superior in terms of feeding performance. On the other hand, it can be seen that the inventive examples (1) and comparative examples (2, 4), in which the stress deviation of the welding wire surface layer portion is not controlled and the hardness deviation is out of the scope of the present invention, are very poor.

As described above, according to the present invention, by controlling the volume ratio of the welded wire laminate within a specific range, it is possible to prevent entanglement during welding by drawing out from the laminate, and reduce entanglement by reducing the hardness deviation of the laminated welding wire. It has a useful effect of preventing and improving feeding performance.

1 is a schematic view showing a general method for laminating and storing welding wires in a large-capacity container;

Figure 2 is a detailed perspective view of the roller bearing used in the welding wire lamination receiving process;

3 is a partial schematic view showing another example of a method of drawing out a welding wire;

4 is a partial schematic view showing another example of a method of drawing out a welding wire to spirally form a loop.

5 is a schematic diagram showing a state in which the welding wire is stacked and received while forming an eccentric shape in a loop.

Figure 6 is a cross-sectional view showing in detail the welding wire to which the present invention is applied; And,

Figure 7 is a flow chart illustrating a step-by-step method for laminating a welding wire according to the present invention.

      Explanation of symbols on the main parts of the drawings

W .... Welding Wire B .... Laminated Body

S .... Supply Source 10 .... Storage Container

11 .... tension roller 12 .... roller bearing

12a .... Home 13 .... Supply Roller

14 .... Fixed roller 15,15 '... Supply line

16 .... Guide Drum 17 .... Rotating Table

Claims (4)

In a bulk vessel yirumyeonseo the eccentricity of a continuous loop (Loop) of the spiral in the wire laminate for a multilayer storage welding, the apparent volume (V ₀₎ and laminated substantive (V ₁₎ for the storage of welding wire of the laminate The laminate of welding wires, characterized in that the ratio (V ₁ / V ₀ ) is 0.4-0.6. The welding wire constituting the laminate has a hardness deviation ΔHv _R at the surface layer portion in the circumferential direction P1 of 45 or less, and a hardness deviation ΔHv _L at the surface layer portion in the longitudinal direction P2. Is less than 45, and the deviation of the ΔHv _R and ΔHv _L is less than 35 within the welding wire laminate. A lamination method in which welding wires are stacked in a large capacity container in an eccentric continuous loop, wherein a straight line is provided between the tension roller and corresponding grooves of the plurality of roller bearings from the step of supplying the welding wires. Continuous withdrawal to be maintained (100); Supplying the welding wire drawn in a straight line to the storage container (110); Allowing the welding wire to fall naturally into the storage container while forming a spiral continuous loop (120); Rotating the storage container with a predetermined period of impact or vibration so that the spiral continuous loop is spread evenly while forming an eccentric (130); and gradually lowering the storage container according to the stacking amount of the welding wire Including 140; The ratio (V ₁ / V ₀ ) of the apparent volume (V ₀ ) of the laminate of the welding wire finally laminated and stored in the container to the actual volume (V ₁ ) of the welding wire laminated and stored is 0.4-0.6. Welding lamination method for welding comprising a. The welding wire has a hardness deviation ΔHv _R of 45 ° or less at the surface layer in the circumferential direction P1, and a hardness deviation ΔHv _L of 45 ° or less at the surface layer in the longitudinal direction P2. , The deviation of the ΔHv _R and ΔHv _L is within 35 for the welding wire lamination method.