JPS646854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reinforcement structure for Pt containers and Pt pipes.

To make a Pt container such as a glass melting crucible,
The cylindrical body 2 shown in Fig. 1b is made by bending a rectangular Pt plate and butt welding both sides of the plate to the upper end of the plate 1 shown in Fig. 1a, which is generally formed by flat drawing a Pt disk.
The lower end of the glass melting crucible 3 is welded to form the glass melting crucible 3 shown in FIG. 1c.

By the way, the glass melting crucible 3 thus produced has insufficient welding strength because the crystal grains at the welded joints 4, 4' are coarsened. Therefore, when a tensile stress is applied in the direction of the arrow due to high heat during glass melting, the glass melting crucible 3 is deformed.

For this reason, in order to strengthen the welded connection points 4 and 4' of the glass melting crucible 3, conventional methods were used as shown in Fig. 2a.
Pt tape 5 is forge welded.

However, when the Pt tape 5 is forge-welded to reinforce the welded joints 4 and 4' in this way, as shown in Fig. 2b.
As shown in the figure, cracks are likely to occur at the boundary 6 with the forge-welded area. In other words, the location where the Pt tape 5 is forge-welded is the location that is most susceptible to deformation due to tensile stress.The forge-welded location of the Pt tape 5 has sufficient strength and there is no problem, but the boundary 6 is concave and thin. There is a lot of upper load, and there is a boundary 6
Since this is on a line perpendicular to the direction in which tensile stress is applied, deformation and cracking are likely to occur from this boundary 6.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a reinforcing structure for the welded joints of the Pt container and the Pt pipe so that deformation and cracking will never occur.

The reinforcing structure in the Pt container and Pt pipe of the present invention is as follows:
It is characterized by forge-welding a Pt tape having continuous smooth shaped edges on both sides and having the same width over the entire length to the welded connection point of the Pt container and the Pt pipe.

An example of this will be explained below with reference to FIG. 3 in the case of a glass melting crucible.A rectangular Pt plate is bent at the upper end of a plate 1 made by flat drawing a Pt disk, and both ends are poked. The welded connection points 4, 4' of the glass melting crucible 3, which is formed by welding the lower end of the cylindrical body 2 which is welded together, have continuous wave-shaped side edges 7, 7' with a smooth radius or an angle. The crests and troughs of the waveforms of the side edges 7 and 7' are made to face each other, and the ridges and troughs are not opposed to each other so that the entire length and width are the same.
Pt tape 8 is forge welded.

According to this reinforcing structure of the glass melting crucible 3, the boundary with the Pt tape 8 is concave and thin, and even if the load is large, the boundary is not on the line perpendicular to the direction in which tensile stress acts, so the deformation stress is dispersed and has high strength, so there is no possibility of deformation or cracking occurring at the boundary.

Next, in order to clarify the effects of the reinforcing structure according to the present invention, specific examples and conventional examples thereof will be described.

Example Using dispersion-strengthened Pt material (Pt-0.08w/o TiC), the third
A glass melting crucible 3 as shown in the figure was made, and Pt tape 8 having a thickness of 0.3 mm, a width of 30 mm, and a corrugated radius of 20 R on both sides was forged welded to the weld connection points 4 and 4' for reinforcement.

Conventional example: Using dispersion-strengthened Pt material (Pt-0.08w/o TiC), the second
A glass melting crucible 3 as shown in FIG.

However, when glass raw materials were put into the glass melting crucible 3 of the example and the conventional example and heated and melted at 1300°C 12 times, it was found that in the conventional glass melting crucible 3, the welding connection points 4, 4' Pt tape 5
There were three horizontal cracks of 70 to 80 mm at boundary 6, and a bulge was observed under Pt tape 5.
In the glass melting crucible 3 of the example, there were no cracks at all at the boundary between the Pt tapes 8 at the welded joints 4 and 4', and no bulges were observed at all.

The reinforcing structure described above is for the glass melting crucible 3 which is a Pt container, but in the case of a Pt pipe, it is preferable to forge-wrap a Pt tape 8 around the welded connection point.

As can be seen from the above explanation, the Pt container and
The reinforcement structure of the Pt pipe is made by forging Pt tape with corrugated side edges and the same width over the entire length at the welded joints, so even if tensile stress is applied, the boundary between the Pt tapes will not lie on the line perpendicular to the tensile direction. Since there is no
It has excellent effects such as no deformation or cracking.

[Brief explanation of drawings]

Figures 1a, b, and c are perspective views showing the manufacturing process of a glass melting crucible, Figure 2a is a perspective view showing a state in which Pt tape is forged welded to the welded part of the glass melting crucible, and Figure b is the same. FIG. 3 is an enlarged vertical cross-sectional view of a main part and a perspective view showing a reinforcing structure of a glass melting crucible according to an embodiment of the present invention. 3...Glass melting crucible, 4, 4'...Welding connection points, 7,7'...Corrugated side edges, 8...Pt tape.

Claims (1)

[Claims] 1. A Pt container and a Pt pipe characterized by forge-welding a Pt tape of the entire length and width with continuous smooth wave-shaped both side edges to the welded connection point of the Pt container and Pt pipe.
Reinforcement structure in pipes.