JPH02229692A - Method for welding quartz tube - Google Patents

Abstract

PURPOSE:To obtain a welded quartz tube of a good finish without requiring labor by forming and fixing connecting mechanisms corresponding to a connecting part, heating and welding the connecting part. CONSTITUTION:External threads 2 and internal threads 3 are provided on the quartz tubes 1 and both tubes are screwed to each other. The tubes are welded when the parts shown by arrows are heated by a hydrogen burner. The build up and deformation of the welded part do not arise and the good finish is obtd. Quartz welding is executable with one person in this way and the jigs for fixing fewer than heretofore are necessitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for welding quartz tubes or quartz products having tubular ends.

[Prior Art] Quartz instruments have excellent heat resistance and chemical resistance, and are very important in chemical experiments and other applications. Because of its high melting point, its processing is carried out using an oxyhydrogen burner.

FIG. 5 is a sectional view showing an example of a conventional welding method. First, as shown in Figure (a), the quartz tubes 1 are brought into contact with each other, and force is applied in the direction of the line arrow from the top and bottom in the figure.
By heating the area indicated by the white arrow from the periphery with a hydrogen burner, it is finished as shown in Figure (b).

[Problems to be Solved by the Invention] Fourth, in the conventional method described above, in order to properly join the welded part and prevent it from shifting during heating with a hydrogen burner, it is necessary to use a stand or a clamp, or to We had to hire multiple people to fix it, but it was very time-consuming.

In addition, since the welded part reaches a high temperature exceeding iooo''C when heated, a certain amount of space is required between the part fixed with a clamp etc. and the welded part, and the quartz tube or quartz product is Freedom in shape and thickness was lost.

Roughly speaking, because constant force is applied to the weld from both sides,
As shown in FIG. 5(b), there was also the problem that the welded portion was raised and the finish was poor.

The present invention was created in view of these problems,
It is time-consuming, requires only a few jigs, and can be done by one person.
It is an object of the present invention to provide a quartz tube welding method that does not impair the freedom of shape of a quartz tube or quartz product as much as possible and provides a good finished result.

[Means for Solving the Problems] The present invention provides a quartz tube welding method for welding together quartz tubes or quartz products whose connecting portions are tubular. This is a quartz tube welding method characterized by fixing the quartz tube, then heating and welding the connecting part.

In the present invention, the connection mechanism includes screwing, interlocking,
Examples include friction.

[Function] When welding a quartz tube or a quartz product at a tubular portion, the present invention provides a threaded connection mechanism (screw), a friction connection mechanism (rubbing), and a mating connection mechanism at the end of the tubular portion. By providing a connection mechanism (interlocking of concavities and convexities) and fixing the welded parts themselves to each other, the trouble of fixing the quartz tube with a stand or clamp is eliminated. Also, by providing this connection mechanism, displacement during welding is prevented.

Furthermore, by fixing with a welded part, there is a greater degree of freedom in the shape and thickness of other parts. Furthermore, since the quartz tube has a very small coefficient of thermal expansion, it maintains its shape after welding, so it hardly bulges or deforms.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a quartz tube showing an embodiment of the present invention using screws. In the same figure, a screw 2 and a female screw 3 are screwed into a quartz tube 1, and both are screwed together as shown in FIG.
Welding cracks occur as shown in Figure (b). The finish is good with no swelling or deformation of the welded parts. The shaft of the tube was also screwed in, so it matched correctly.

The connection mechanism of the present invention can obtain the same effect as the screw described above not only by using a screw but also by meshing a convex portion 4 and a concave portion 5 having shapes as shown in FIG. 3. By fitting the unevenness,
By twisting each in the direction of the white arrow, the two meshed accurately and were firmly fixed. Thereafter, the joints were welded using an oxyhydrogen burner in the same way as in the case of Fig. 2.

In addition, if it is not necessary to fix the screws as firmly as the interlocking of the concave and convex portions, as shown in Fig. 4, a rub 6 is provided on both quartz tubes 1 to connect the two, and an oxyhydrogen burner is also used. Weld the connections.

In the embodiments of the present invention, quartz welding, which was previously difficult to do by one person, can now be done by one person, and the number of fixing jigs (clamps, stands, etc.) used can be reduced compared to the past.

The finished product also has a smooth surface with almost no bumps or unevenness, and even if they were present, they were less noticeable. At the same time, welding unevenness was eliminated, so no pinholes remained.

[Effects of the Invention] As explained above, according to the present invention, the work can be performed by one person without much effort, with few jigs, etc., and without impairing the freedom of shape of the quartz tube or quartz product as much as possible. It is possible to provide a quartz tube welding method with good finishing results.

[Brief explanation of the drawing]

FIG. 1 is a side view of a quartz tube before connection in one embodiment of the present invention, FIG. 2 is a cross-sectional view of the quartz tube after connection in the embodiment of FIG. 1, and FIGS. 3 and 4 are A perspective view of a quartz tube according to another embodiment, and FIG. 5 is a sectional view of a quartz tube showing a conventional method.

Claims (1)

[Claims] (1) In a quartz tube welding method in which quartz tubes or quartz products with tubular connecting parts are welded together, a connecting mechanism corresponding to each other is formed in the connecting parts, and after fixing both with the connecting mechanism, the connecting part is heated. A method of welding a quartz tube, which is characterized in that the tube is welded.