CN202140704U - Brazing connection structure of thin-walled stainless steel tube - Google Patents

Abstract

The utility model provides a brazing and connecting structure for thin-wall stainless steel pipes. The brazing and connecting structure is characterized by comprising a pipe fitting (1) and a stainless steel connecting pipe (2), wherein the pipe fitting (1) is fixedly connected with the stainless steel connecting pipe (2) in a brazing manner, an internally extended depth of a spigot of the pipe fitting (1) is 3-5mm, a countersink type spigot of an annular table-shaped structure is arranged at the bottom of the pipe fitting (1), and the outer diameter of the spigot end of the stainless steel connecting pipe (2) is smaller than the inner diameter of the spigot by 0.1mm - 0.5mm, so that an annular gap for the brazing is formed.

Description

Brazing connection structure of thin-walled stainless steel tube

technical field

The utility model relates to a connection structure of municipal industry and civil building water supply pipelines, in particular to a brazing connection structure of thin-walled stainless steel pipes.

Background technique

Brazing connection has obvious advantages over traditional screw connection, adhesive bonding and argon arc welding technology: it is a metallurgical combination, brazing joint has reliable quality, high strength, good sealing performance, strong corrosion resistance, and long-term use No leakage, long service life, simple operation, low technical requirements for workers, and can meet the needs of quick assembly of water pipe joints.

Invention content

The purpose of the utility model is to provide a thin-walled stainless steel tube brazing connection structure.

The purpose of this utility model can be achieved through the following technical measures:

The thin-walled stainless steel pipe brazing connection structure of the utility model includes pipe fittings and stainless steel connecting pipes that are mutually socketed and fixed together by brazing; wherein the socket of the pipe fittings has an internal extension depth of 3-5 mm, The bottom is a countersunk hole socket with ring-shaped structure; the outer diameter of the socket end of the stainless steel connecting pipe is 0.1-0.5mm smaller than the inner diameter of the socket, which is used to form an annular gap for brazing welding.

Concrete welding operation method of the present utility model is as follows:

Firstly, set the quartz baffle on the stainless steel connecting pipe to prevent the molten brazing material from dripping down the pipe and from the brazing seam when brazing in an upside-down manner, and then connect the stainless steel with the quartz baffle Insert the pipe into the socket of the pipe fitting until it contacts the inner ring platform of the inner end surface of the pipe fitting; adjust the gap between the quartz baffle plate and the brazing seam to 0.5-1.0mm, and this gap is used to place the solder; Apply brazing flux to the socket of the pipe fitting and the stainless steel connecting pipe, and use the flame heating method to melt the brazing filler metal; after the brazing filler metal is melted, it is blocked by the quartz baffle and no longer flows down the stainless steel connecting pipe, and is mainly filled into the fitting by capillary action In the socket gap with the stainless steel connecting pipe; after the brazing material solidifies, a brazing fillet is formed at the brazing seam.

When this welding method is brazed and connected in an inverted manner on the construction site, the quartz baffle can effectively prevent the molten solder from flowing down the pipe, so that the solder can completely fill the gap between the pipe fitting and the connecting surface of the pipe, and The brazing fillet is formed, which solves the problem of low filling rate of brazing filler metal during upside-down brazing.

The thickness of the quartz spoiler described in the utility model is 0.5-1.0 mm.

The beneficial effects of the utility model are as follows:

The thin-walled stainless steel pipe brazing connection structure of the utility model has the advantages of reliable brazing joint quality, high strength, good sealing performance, strong corrosion resistance, no leakage after long-term use, long service life, simple operation, and technical requirements for workers. The height is not high, which can meet the needs of quick assembly of water pipe joints.

Description of drawings

Accompanying drawing is the schematic diagram when processing the thin-walled stainless steel pipe brazing connection structure of the present utility model.

In the figure 1. Pipe fittings, 2. Stainless steel connecting pipe, 3. Quartz baffle, 4. Brazing material ring.

Detailed ways

The utility model will be further described below in conjunction with embodiment (accompanying drawing):

As shown in the figure, the thin-walled stainless steel pipe brazing connection structure of the present invention includes a pipe fitting 1 and a stainless steel connecting pipe 2 that are mutually socketed and fixed together by brazing; wherein the socket of the pipe fitting 1 is The inner extension depth is 3-5mm, and the bottom is a countersunk socket with ring-shaped structure; the outer diameter of the socket end of the stainless steel connecting pipe 2 is smaller than the inner diameter of the socket by 0.1-0.5mm, which is used to form a brazing socket. annular gap. When welding, the stainless steel connecting pipe 2 is sleeved with a quartz baffle 3 for preventing molten brazing filler metal from dripping down the pipe and running off from the brazing seam during inversion mode brazing, and the distance from the quartz baffle is The gap of the brazing seam is 0.5-1.0 mm; the thickness of the quartz baffle is 0.5-1.0 mm.

The specific implementation of the utility model is as follows: the inner diameter of the pipe fitting 1 described in the utility model is 20.2mm, and the inner surface of the socket has a ring groove with a depth of 4mm and the bottom is a ring-shaped structure; the outer diameter of the stainless steel connecting pipe 2 is 20.0mm The thickness of the quartz baffle 3 is 0.5 mm, and a round hole with a diameter of 20.1 mm is processed in the middle; the quartz baffle 3 and the solder ring 4 are set on the stainless steel connecting pipe 2 respectively, and the stainless steel connecting pipe 2 is inserted into the pipe fitting 1 until it contacts with the ring platform at the bottom of the annular groove of the pipe fitting 1 socket; and adjust the gap between the quartz baffle 3 and the brazing seam to 1.0mm. the

At the same time, it is necessary to apply brazing flux on the socket between the pipe fitting 1 and the stainless steel connecting pipe 2, and use the flame heating method to melt the brazing material; It is mainly filled into the socket gap between the pipe fitting 1 and the stainless steel connecting pipe 2 by capillary action; after the brazing material solidifies, a brazing fillet is formed at the brazing seam.

Claims (1)

1. thin-wall stainless steel soldering linkage structure, it is characterized in that: said linkage structure comprises with mutual socket joint and pipe fitting (1) that is fixed together through brazing mode and stainless steel connecting tube (2); The joint socket of wherein said pipe fitting (1) is that interior deepening degree 3～5mm, bottom are for encircling the hole countersunk joint socket of platform shape structure; The bell end external diameter of said stainless steel connecting tube (2) is used to form the annular space that supplies the soldering welding less than the internal diameter 0.1～0.5mm of joint socket.

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