Welding process for equal-diameter large quartz pipes

Abstract

The invention discloses a welding process for equal-diameter large quartz pipes. The welding process for the equal-diameter large quartz pipes comprises the following steps of A. carrying out chamfering; B. carrying out cleaning and drying; C. placing the two large quartz pipes on a marble platform, and reserving a gap with a size of 1mm; D. welding three welding points which are uniformly distributed along the circumference; E. taking two sections of an arc-shaped welding flux, and fusing the arc-shaped welding flux to complete welding for 2 / 3 of the circumferences of the large quartz pipes; F. carrying out lifting, placing a plurality of graphite rolling wheel assemblies under the large quartz pipes, and rotating the large quartz pipes by 90-180 degrees; G. adding the arc-shaped welding flux to the gap of the unwelded 1 / 3 of the circumferences, and fusing the arc-shaped welding flux to complete welding for the remainder 1 / 3 of the circumferences; and meanwhile, carrying out filler supplementing on the welded 2 / 3 of the circumferences; H. carrying out filler supplementing on the remainder 1 / 3 of the circumferences; and I. carrying out finished product inspection. The welding process for the equal-diameter large quartz pipes has the advantages of being capable of ensuring the concentricity of the two large quartz pipes well, reasonable in welding flux distribution and addition, capable of carrying out rapid welding on the whole circumferences of the large quartz pipes, good in welding effect, and high in welding yield.

Description

technical field [0001] The invention relates to the technical field of quartz welding, in particular to a welding process for large quartz tubes with equal diameters. Background technique [0002] Quartz large tube has the characteristics of high hardness, small thermal expansion, stable structure size, chemical corrosion resistance (except hydrofluoric acid), radiation resistance, high optical uniformity, high temperature resistance, rapid cooling and heat resistance, high mechanical strength, etc., and is widely used It is used in chemical industry, civil, aviation, electronics, solar photovoltaic, medical equipment and other fields. It is the preferred pipe material in the deep processing industry of quartz materials. It has a good market prospect and great economic benefits. The existing large quartz tubes are generally produced by electric melting furnaces, and the molding technology of large quartz tubes with a diameter greater than 300mm is still insufficient. There a...

AI Technical Summary

Problems solved by technology

The existing large quartz tubes are generally produced by electric melting furnaces, and the molding technology of large quartz tubes with a diameter greater than 300mm is still insufficient. There are often defects such as low output, low molding quality, bubble gas lines, and high production costs. Large quartz tubes of this size generally need to be expanded with a tube expander. The preparation process is complicated, and the length of each section produced should not be too long.

[0003] At present, the maximum length of the large quartz tube produced by one-time molding and two-time expansion is about 2m, but in some cases in actual application, it is necessary to use a large quartz tube of more than 2m. At this time, it is necessary to weld multiple sections of the large quartz tube Then put it into use, but there is little research on the welding process of large-sized quartz tubes at present, because the length of small-sized quartz tubes is rarely insufficient, even if welding is required, the operation of small-sized quartz tubes is more flexible. The end is clamped by a fixture, the concentricity is easy to ensure, and then it can be welded with solder, and the welding pass rate is high

[0004] When welding large-size quartz tubes, there are the following problems: 1. The positioning of two large-size quartz tubes is difficult, and it is impossible to clamp them with conventional clamps, and the concentricity is difficult to ensure; 2. Due to the difficulty of clamping with clamps, currently only Welding it on the marble platform, the welding of the bottom of the large quartz tube and the platform is very difficult; 3. It is difficult to add solder, because the large-sized quartz tube needs to be welded with a longer circumference, and it needs to add solder many times. Moreover, if the inside and outside of the large quartz tube are fired at the same time, it is easy to burst due to lack of stress concentration, and the yield is low. Moreover, once it is scrapped, the cost is high, and the delivery of the large quartz tube will be delayed.

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