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Methods and advantages of stainless steel pipe welding

by:Mayer     2021-08-24
Welding method of stainless steel pipe fittings Welding connection Using hot melt technology, the end of the piping is grooved, and the piping is welded by manual or automatic welding, and the two connecting pieces are welded to achieve the connection effect. The welding connection has high connection strength and good sealing effect. The welding seam gas protection of the on-site welding port is difficult to meet the standard, which causes the welding seam to be easy to rust, which directly reduces the service life of the pipeline. In the projects that Zhiqi company contacts, argon arc welding connection is still a common connection method. It has a wide range of pipe diameters, various pressures, etc. and can use the advantages of stainless steel pipe welding. It is safer to weld stainless steel pipes. Reliable, there is no internal sealing ring, which is a dead connection. It has a wide range of applications, both exposed and concealed installations. It is more suitable for cold water systems and hot water systems. Once installed, it is basically unnecessary to consider maintenance. This type of connection has been used on copper pipes for many years, and the Ministry of Construction now focuses on recommending this type of jointless connection for stainless steel connections. (1) The order of cost price and sales price from high to low is: order 1>order 2>order 3. (2) Preface 1-2 is a field assembly type (special tools need to be borrowed) installation, fast and simple, suitable for surface installation. When the function of the rubber ring is lost, the nut can be removed for sequence 1 to replace it, and the connection in sequence 2 should be replaced after sawing due to a dead connection. Preface 3 is suitable for burying and embedded in the wall, of course, it can also be mounted on the surface. (3). Brief introduction to the installation of the first card convex type: special installation tools are required for installation, and the installation range of DN15-50 (DN15-20) pipes is to be clamped on the outer wall of the pipe with a special tool. Sleeve, (DN25-50) caliber pipe is installed on the inner wall of the pipe with a ring-shaped step with a tool. (4). Brief introduction to the installation of sequence 2 pressing type: special installation tools are required for installation, the installation range is DN15-100, the pipe is inserted into the pipe fittings and the pipe wall is clamped into a hexagonal shape with special tools, and the inside is sealed. The circle is also transformed into a hexagon. (5) Sequence 3 welding type (socket argon arc welding type): the installation range is DN15-100, insert the pipe into the pipe fitting during installation, and use an argon arc welding machine to weld and melt the originally reserved extension slope on the pipe fitting. Other solders belong to the main body welding, and the construction is simple. (Butt argon arc welding type) The installation range is DN125-200. When installing, align the ports of the pipe and the pipe fittings and use an argon arc welding machine for welding, but stainless steel electrodes are required as solder. There is a certain degree of difficulty in construction. (6) The buried pipe should meet the requirements of the same life as the building as much as possible. Therefore, the water pipe should preferably be connected without joints. The service life of stainless steel pipes can reach 70-100 years, which refers to pure stainless steel pipes that do not contain other materials such as rubber rings. At the same time, it is required to reduce joints as much as possible for buried pipes (one more joint means one more water leakage hazard), and most of the buildings that use metal pipes (stainless steel pipes, copper pipes) are connected by welding.
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