JP2764501B2 - Ceramic end tab for welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding end tab, and more particularly to a ceramic end tab capable of obtaining a sound initial layer weld.

[0002]

2. Description of the Related Art Welding end tabs are roughly classified into those made of steel and those made of ceramic (refractory). The latter end tab is made of ceramic. As a result, a beautiful bead surface is obtained, and it can be easily separated from the molten and solidified metal.
There is an advantage that post-processing is not required and it can be used repeatedly, and is often used.

[0003] By the way, it is well known that a gas is generated from a molten material at the time of welding, but this gas remains in the molten metal without solidifying and becomes a welding defect when solidified. Since this welding defect is particularly likely to occur in the first layer weld, various measures for degassing have been conventionally studied and proposed. However, none of them are effective.

An object of the present invention is to provide a welding end tab capable of degassing more effectively in view of such a situation.

[0005]

As a means for solving the above-mentioned problems, a welding end tab according to the present invention is a ceramic end tab having a flat surface and a weir on its surface. It is characterized by notches.

Further, another aspect of the present invention is a ceramic end tab having a flat surface on its surface and a weir on only one side of the flat surface, wherein the flat surface forms a gas escape surface having a taper in a thickness direction. It is characterized by:

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

[0008]

Embodiment 1

[0009] Although the ceramic end tabs there are various types, typical end-tab is end tabs of the type having a weir 3 _1, 3 ₂ a flat surface 2 on both sides of the flat surface 2 as shown in FIG. 1 1, an end tab 1 of a type having a flat surface 2 and a weir 3 on only one side of the flat surface 2 as shown in FIG. Any type of end tabs, at least a flat surface and the weir, in the same or similar shape the flat surface on the groove shape, a wait shape if narrow downwardly, its lower 2 ₁ The root gap It is the corresponding short part.

[0010] In this type of end-tab, since the gas may remain liable to the first layer weld as part because lower short of the flat surface, in the present invention, notch of the lower 2 ₁ for degassing 4 Is provided. The notch 4 extends from the front surface to the rear surface in the thickness direction of the tab.

The shape and dimensions of the gas vent notch 4 may be circular, semi-circular, elliptical or other suitable shapes such as arcs having an appropriate curvature, squares, rectangles, or triangles. The notch dimensions are preferably about 4 mm in width and about 4 mm in height. It should be noted that if the notch is too large, the melt may leak. Such notches 4 can be formed at an appropriate position of the bottom 2 _first flat surface 2, preferably formed substantially in the center.

In the case of a type having a weir on both sides of the end tab, two gas vent cutouts are provided on one side. That is, in the case of the end tab of the type shown in FIG. 1, the gas vent cutouts are formed at the lower portions of the flat surfaces on both the front and back surfaces.
₁ and the upper 2 to ₂ of 2 places notches degassing 4 is formed. On the other hand, in the case of the end tab of the type shown in FIG. 2, gas vent cutouts are formed at the lower portions of the flat surfaces on both the front and back sides, but since weirs are formed on only one side, when viewed from the surface, the flat surface is flat. lower 2 ₁ and the upper 3 to ₃ of the two places notches degassing 4 weirs 3 surface 2 is formed.

FIG. 3 shows an example of use of an end tab of the type shown in FIG. 1 provided with a gas vent cutout. A groove is formed by abutting the base materials W ₁ and W ₂ , a backing metal 10 is attached to the lower surface of the base material, and an end tab 1 is attached so as to match the groove. As a result, the space in the groove communicates with the outside through the gas vent cutout 4 of the end tab, and most of the gas generated during the first layer welding floats or escapes upward, but is trapped in the melt. The released gas is released to the outside through the gas vent notch 4,
No residual gas is generated in the melt.

[0014]

Embodiment 2

In another aspect of the present invention, a flat surface is formed as a gas escape surface having a taper in a thickness direction in an end tab of the type shown in FIG. 2 as a means for venting gas. That is, as shown in FIG. 4, the whole surface is tapered in the thickness direction starting from the inclined portion of the flat surface 2 of the weir 3, and this surface becomes the gas escape surface 5. Compared to the shape of FIG. 2, it can be said that the hatched portion in FIG. The taper angle θ may be a very small angle, preferably around 20 °. It should be noted that the gas escape surface 5 may be either a flat surface or a flat surface with a curved surface, but the flat surface is more effective. is there.

By providing the gas escape surface 5 having such a shape, gas can be effectively vented as in the case of the gas vent notch 4 described above. Since it is inclined at an extremely small angle, gas can be vented without leakage of the melt from the gap with the base material.

FIG. 5 shows an example of use of the end tab with a gas flank. A groove is formed by abutting the base materials W ₁ and W ₂ of different widths, a backing metal (not shown) is attached to the lower surface of the base material, and the weir 3 is fitted to the base so as to match the groove. end-tab 1 is mounted in contact with the end surface of the wood W _2. As a result, the space in the groove communicates with the outside through the gas escape surface 5, and most of the gas generated during the first layer welding floats or escapes upward, but the gas trapped in the molten material. Is discharged to the outside through the gas escape surface 5, so that no residual gas is generated in the melt. Of course, it can be used for a base material having the same width.

In the present invention, the gas vent notch shown in the first embodiment and the gas escape surface shown in the second embodiment can be provided together, so that the gas can be more effectively released. it can.

[0019]

As described above, according to the present invention,
Since the gas vent notch and the gas flank are provided, the gas can be effectively vented, and the effect of obtaining a sounder welded portion than before has been great.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a ceramic end tab with a gas vent notch according to the present invention, showing a type end tab having a weir on both sides of a flat surface.

FIG. 2 is a perspective view showing an example of a ceramic end tab with a notch for venting according to the present invention, showing an end tab of a type having a weir on only one side of a flat surface.

FIG. 3 is a diagram illustrating a usage example of the end tab shown in FIG. 1;

FIGS. 4A and 4B are views showing a ceramic end tab with a gas escape surface of the present invention, wherein FIG. 4A is a perspective view and FIG. 4B is a plan view.

FIG. 5 is a diagram illustrating a use example of the end tab shown in FIG. 4;

[Description of sign]

DESCRIPTION OF SYMBOLS 1 End tab 2 Flat surface 2 ₁ Lower part of flat surface 2 ₂ Upper part of flat surface 3 Weir 3 ₁ Weir 3 ₂ Weir 3 ₃ Upper part of weir 4 Notch for degassing 5 Gas escape surface W ₁ Base material W ₂ Base material 10 Back Money

──────────────────────────────────────────────────の Continued on the front page (58) Investigated field (Int. Cl. ⁶ , DB name) B23K 37/06 Design classification K7-1411

Claims (4)

(57) [Claims] 2. A ceramic end tab having a flat surface and a weir on its surface, wherein a gas vent notch is provided at least below the flat surface. 2. An end tab having a flat surface and a weir on both sides or only one side of the flat surface.
The ceramic end tab for welding according to 1. 3. A ceramic end tab having a flat surface on its surface and a weir on only one side of the flat surface, wherein the flat surface forms a gas escape surface having a taper in a thickness direction. For ceramic end tab. 4. The welding ceramic end tab according to claim 3, wherein a gas vent notch is provided at least at a lower portion of the flat surface.