JPH05337692A - Backing metal for plate seam welding - Google Patents

Abstract

PURPOSE:To provide the backing metal for plate seam welding capable of increasing penetration. CONSTITUTION:This backing metal 1 has an abutting part 2 placed on the rear of a base metal plate W1 and an inclined part 4, notched in order to face a groove side, formed of a curved surface whose curvature of radius is R. Also, another backing metal has the abutting part 2 placed on the rear of the base metal plate, the inclined part 4, notched in order to face the groove side, formed of a curved surface whose curvature of radius is R, and moreover, parallel part continued to the inclined part. The inclined parts and the parallel parts may be provided on both faces of the front surface and the rear of the backing metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing metal for welding, and more particularly to a backing metal having a large amount of penetration when plate-welding a base metal plate.

[0002]

2. Description of the Related Art A backing metal is used when plate-welding a base metal plate, and a conventional backing metal is generally used as shown in FIG. Has a contact portion to be applied to the back surface and a sloped portion notched at an angle θ to face the groove side.

The angle θ of this inclined portion is generally the same as or substantially the same as the groove angle, so that it is generally an acute angle. However, as shown in FIG. 2, when the abutting portion of the backing metal is brought into contact with the back surface of one base material plate and the end face of the inclined portion is arranged so as to contact the end face of the other base material plate and welded. Since the angle θ of the inclined portion is an acute angle, there is a drawback that welding penetration is small and welding defects are likely to occur.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a backing metal for plate joint welding which can increase the penetration.

[0005]

As a means for solving the above-mentioned problems, the present invention provides a backing having an abutting portion which abuts on the back surface of a base material plate and a sloped portion which is cut out to face the groove side. The present invention is directed to a backing metal for plate joint welding, characterized in that the inclined portion is composed of a curved surface having a curvature R.

Further, according to another aspect of the present invention, in a backing metal having an abutting portion to be applied to the rear surface of the base material plate and an inclined portion cut out to face the groove side, the inclined portion is a curved surface having a curvature R. In addition, the present invention provides a backing metal for plate joint welding, which is characterized in that a parallel portion is provided so as to be continuous with the inclined portion.

The backing metal of the present invention will be described in more detail below with reference to the drawings.

[0007]

[Embodiment 1] FIG. 3 shows an example of a backing metal of the present invention. The backing metal has an abutting portion to be brought into contact with the back surface of the base material plate, and is made to face the groove side. It is a backing metal having a shape in which the notched inclined portion has a curved surface with a curvature R.

The curvature of the curved surface of the inclined portion may be an appropriate curvature R (eg, 4R) in consideration of the groove angle. Further, the horizontal length and height of the inclined portion may be appropriate as in the conventional notch and dimension.

FIG. 4 shows an example in which the backing metal of FIG. 3 is provided with an inclined part on one surface, whereas the backing metal is provided with semi-symmetrical inclined parts on both the front surface and the back surface. is there. This shape of backing metal has the advantage that both sides can be used. The thickness h ₁ at one end and the thickness h ₂ at the other end of the backing metal may be h ₁ = h ₂ or h ₁ <h ₂ or h ₁ > h ₂ .

FIG. 5 shows an example of use of the backing metal shown in FIG. 4, in which the contact part of the backing metal is brought into contact with the back surface of one of the base plates and the end face of the inclined part is made into the other. To the end surface of the base material plate. As a result, the angle α formed between the inclined portion of the backing metal and the other base material plate is 90 ° to approximately 90 °, and the inclined portion is a curved surface with a curvature R, the bottom of the groove is Since the angle is gentler than the conventional acute angle θ, welding penetration can be increased and welding defects can be reduced.

[0011]

[Embodiment 2] FIG. 6 shows another example of the backing metal of the present invention. The backing metal is provided with an abutting portion to be contacted with the back surface of the base metal plate and a notch for facing the groove side. The backing metal has a shape in which the inclined portion has a curved surface with a curvature R, and a parallel portion is provided so as to be continuous with the inclined portion.

The length of the parallel portion may be any suitable length (eg, 5 mm). The curvature R and the like of the inclined portion may be the same as in the above example.

In FIG. 7, the backing metal of FIG. 6 is provided with an inclined part and a parallel part on one surface, whereas the backing metal is semisymmetrically inclined and parallel to both the front surface and the back surface of the backing metal. This is an example in which a section is provided. The backing metal of this shape has an advantage that both sides can be used, like the backing metal of FIG. Thickness h _{1 of one} end of backing metal
And the thickness h ₂ at the other end is set to h ₁ = h ₂ , or h ₁ <
It may be h ₂ or h ₁ > h ₂ .

FIG. 8 shows an example of use of the backing metal shown in FIG. 7, in which the abutting portion of the backing metal is brought into contact with the back surface of one of the base metal plates, and the parallel portion has the other base metal. Place the back of the lumber. As a result, the angle α formed between the inclined portion of the backing metal and the other base material plate (and a part of the parallel portion) is 90 ° to almost 90 °, and the inclined portion has a curved surface with a curvature R. Therefore, since the bottom of the groove forms a gentler angle than the conventional acute angle θ, it is possible to increase the penetration of welding,
Welding defects can be reduced. Suitable for plate joint welding of base metal plates with different plate thickness. Needless to say, the usage shown in FIG. 5 is also possible.

[0015]

As described above in detail, in the backing metal of the present invention, since the inclined portion forms a curved surface having a curvature R, or the parallel portions are further connected, the case of the conventional backing metal It is possible to significantly increase the penetration of welding, and thus to reduce welding defects. Further, it is possible to design such that both sides of the backing metal can be used, and further, it can be applied to welding of base material plates having different plate thicknesses, which is economical.

[Brief description of drawings]

FIG. 1 is a view showing a shape of a conventional backing metal.

FIG. 2 is a diagram illustrating a method of using a conventional backing metal.

FIG. 3 is a diagram showing an example of a backing metal of the present invention, showing a case where an inclined portion is provided on one surface.

FIG. 4 is a view showing an example of a backing metal of the present invention, showing a case where inclined portions are provided on both sides.

FIG. 5 is a diagram illustrating an example of using the backing metal of FIG.

FIG. 6 is a view showing another example of the backing metal of the present invention, showing a case where the inclined portion and the parallel portion are provided on one surface.

FIG. 7 is a view showing another example of the backing metal of the present invention, showing a case where the inclined portion and the parallel portion are provided on both sides.

FIG. 8 is a diagram illustrating a usage example of the backing metal of FIG. 7.

[Explanation of symbols]

1 backing metal 2 base material backside contact part 3 inclined part 4 inclined part (curved surface) 5 parallel part W ₁ base material plate W ₂ base material plate

Claims (5)

[Claims] 1. A backing metal having an abutting portion to be applied to the back surface of a base material plate and an inclined portion cut out to face the groove side, the inclined portion having a curved surface with a curvature R. A backing metal for plate joint welding. 2. A backing metal having an abutting portion to be applied to the back surface of a base material plate and a sloped portion notched to face the groove side, wherein the sloped portion has a curvature R and the slope A backing metal for plate joint welding, which is characterized in that parallel portions are provided so as to be continuous with the portions. 3. The inclined portion and the parallel portion are provided on at least one of the front surface and the back surface of the backing plate.
Or the backing deposit described in 2. 4. The end face of the inclined portion or the end face of the parallel portion,
The backing metal according to claim 1 or 2, which is a surface for contacting an end surface of the other base material plate. 5. The backing metal according to claim 2, wherein the parallel portion is a surface to be brought into contact with the back surface of the other base material plate.