JP2520507Y2 - Ceramic end tabs for rib welding - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a ceramic end tab, and more specifically, when welding ribs (stiffeners) to a mold material by multi-layer welding, after welding the first layer. The present invention relates to a ceramic end tab for rib welding having a novel function to be used.

(Prior art and problems to be solved) The end tabs attached to the ends of the welding line are roughly classified into steel tabs and ceramic tabs, but the latter ceramics are used in terms of ease of use such as removal after welding. Tabs are used a lot. All of them are used as the arc start point in the first layer welding, and are used for the purpose of preventing leakage of weld metal, defective fusion, prevention of welding defects such as blowholes, etc., especially to prevent welding defects in the first layer welding part. The use of end tabs is said to be essential.

However, aside from using the end tabs for the first layer welding, during the subsequent welding, an arc is run on the first layer buildup to form a surplus, but the weld metal spills out at the joint end. So be very careful. For this reason, there is a problem that the welding efficiency is lowered, or end treatment is required after welding.

In particular, in recent years, the welding structure has become complicated, and for example, ribs need to be welded as a reinforcing material to a mold material composed of a flange and a web.

When rib-welding to such a mold,
As shown in the figure, the groove is processed into the tab R and the web
A space 3 is formed at the end of the rib that abuts the SW to facilitate welding work. Then, in rib welding, after backing metal 1 such as a steel tab is attached to the rear surface of the groove, multilayer welding is performed in the groove.

However, since the space 3 is formed at the end of the rib,
Post-welding treatment is necessary because molten metal leaks into the space and spatter adheres to the flange and the web surface.

It is an object of the present invention to solve the above problems associated with rib welding to a mold material and to provide a technique in which spatter adhesion and molten metal leakage do not occur.

(Means for Solving the Problems) In view of the above problems, the present invention proposes that the conventional fixed concept of the end tab, that is, the end tab is mainly used for preventing occurrence of welding defects in the first layer welding. Regarding the fixed concept, the suitability of the fixed concept was examined, and in the case of rib welding, earnest research was conducted on means for solving the problems of spatter adhesion and molten metal leakage in welding after initial layer welding. As a result, they have found that spatter adhesion and molten metal leakage can be easily prevented by devising a ceramic end tab corresponding to the conventional ceramic end tab as the end tab surface after the initial layer welding.

That is, according to the present invention, when a rib having a tip cut is welded to a flange of a mold material composed of a flange and a web, the edge of the rib is cut at the weld line edge after the first layer welding and the rib is cut between the mold material. In a rib-welding ceramic end tab used in the space formed in, a bottom flat surface facing the flange surface, a pair of concave lower curved surfaces of arbitrary curvature standing upright from the bottom flat surface, and further connected to the concave lower curved surface. A ceramic for rib welding, comprising a pair of convex upper curved surfaces having an arbitrary curvature, the convex upper curved surfaces having a cross-sectional shape intersecting at a vertex, and the concave lower curved surfaces forming end tab surfaces. The end tab is the gist.

(Example) The ceramic end tab for rib welding according to the present invention is, as shown in FIG. 3 showing its use condition, in short, after the first layer welding, it is inserted into the space of the rib end and attached to the welding line edge. It is possible to prevent the leakage and the adhesion of spatter during the subsequent melting.

There are various possible modes for the rib-welding ceramic end tab used for this purpose.

Figure 2 shows an example of the ceramic end tabs rib welding, the bottom plane 2 _1, a concave lower curved surface 2 _2, has a cross-sectional shape composed of convex upper curved surface 2 _3. The length of the ceramic tab may be at least equal to the rib thickness.

Bottom plane 2 _1, as shown in FIG. 3, opposite the flange SF surface of the mold material S, which is a portion abutting.

The concave lower curved surface 2 ₂ erected from the bottom plane 2 _1, a concave having an appropriate curvature (eg, 45R), to form a end-tab surface. From the viewpoint of preventing molten metal leakage, it is possible to make this curved surface straight,
In the case of straightening, turning welding is required to prevent defective fusion and the like, but turning into a concave curved surface makes turning welding unnecessary. Further, the curved surface can prevent the scrap portion (the upper corner of the rib groove) from falling off.

Convex upper curved surface 2 ₃ has been connected to the concave lower curved surface 2 _2, and has a curved surface convex to the opposite to the concave lower curved surface 2 _2.
This is because, as shown in FIG. 3, the shape of the space 3 at the end of the rib is adapted to the cut surface of the rib end, and the curvature that is almost in contact with this cut surface (eg, 35R)
Should have.

Of course, what is the pair concave lower curved surface 2 ₂ symmetrical as shown in the second figure, in order not to restrict the usability of ceramic tabs, one of the concave lower curved surface can also be used as end-tab surface.

When using this rib welding ceramic end tab, as shown in FIG. 3, after inserting the ceramic end tab into the space 3, the concave lower curved surface on the side opposite to the end tab surface to be used and the web SW. It may be supported by sandwiching a cut wire or the like between and.

The first layer welding may be performed in the same manner as conventional welding. For example, as shown in FIG. 3, a steel backing metal 1 is attached to the back of the groove so as to project 10 mm or more toward the scrap, and a 1-pass or 2-pass welding process is performed, and then the ceramic tab of the present invention. The ceramic end tabs 2 for rib welding can be easily removed by supporting 2 in the space, performing subsequent welding, and removing the supporting member 4 after welding. Slag removal is also easy.

(Effect of the Invention) As described above, the present invention is configured to be used for welding after the first layer welding regardless of the conventional concept of the end tab, so that welding work such as rib welding to a mold material is difficult. Even in various places, there is no problem of spatter adhesion or weld metal leakage, corner scrap of the scrap part can be prevented, and post-welding processing becomes simple. In addition, welding can be performed efficiently without requiring special welding technology.

[Brief description of drawings]

FIG. 1 is a view for explaining a positional relationship between a mold member and ribs, FIG. 2 is a perspective view showing an example of a rib welding ceramic end tab of the present invention, and FIG. 3 is a usage example of the rib welding ceramic end tab of the present invention. FIG. 1 …… Back metal, 2 …… Rib welding ceramic end tabs, 2 ₁ …… Bottom flat surface, 2 ₂ …… Concave lower curved surface, 2 ₃ …… Convex upper curved surface, 3 …… Space portion, 4 …… Support Material, S ... Mold material, SF ... Flange, SW ... Web, R ... Rib.

Claims (1)

(57) [Scope of utility model registration request] 1. When welding a rib whose tip is cut to a flange of a mold material composed of a flange and a web, at the weld line edge after the first layer welding, and at the end of the rib being cut and between the mold material. In a ceramic end tab for rib welding used in the formed space, a bottom plane surface facing the flange surface, a pair of concave lower curved surfaces of arbitrary curvature standing upright from the bottom plane, and further optionally connecting to the concave lower curved surface. Ceramic end tab for rib welding, characterized in that it comprises a pair of convex upper curved surfaces having different curvatures, the convex upper curved surface has a cross-sectional shape intersecting at a vertex, and the concave lower curved surface forms an end tab surface. .