As a pipe fitting product that can often be seen in daily life, the use of hose coupling can be said to be quite extensive and common. Many people are the first to come into contact with this kind of pipe fittings, they all want to know which specifications can be divided into, so please follow the editor to learn about it!In fact, the more commonly used pipe fittings such as hose coupling can be divided into many types in terms of specifications. And among these different types of specifications, most of them have a common feature, that is, the component of the hose coupling. In general, we often see many hose fittings in our daily lives, but we can find that they are composed of three parts. Therefore, the consistency of this structure also allows hose couplings to be widely used in some liquid transportation industries. Generally speaking, one of the more common specifications is pipe fittings with 90-degree elbow joints.In addition, one of the commonly used specifications is also commonly used in hose coupling. It is a 45-degree elbow joint. It is worth noting that although these two more common metal pipe products have different specifications, the difference in these degrees does not prevent them from being widely used in many industries. Metal hoses are widely used in the transportation of dry fuel oil, insulating oil, and steam turbine oil in thermal power plants. Because the medium conveyed by the hose has a higher pressure and temperature. Therefore, leakage or desoldering of the welded parts will cause serious accidents. The metal hose has two layers inside and outside, and the inner layer is a small φφφ20 x2mm hose. The outer layer is a warp-woven fine steel wire mesh, and the two layers are made of 1Cr18Ni9Ti. The hose is mainly used for sealing, and the fine steel wire mesh is used for strength protection. There are currently three types of hoses produced by the manufacturer (screw integral type, seam welding type and brazing type). Since the metal conveying hose on the power station boiler is subjected to higher temperature and pressure during operation, it is often subjected to bending stress. Therefore, it is recommended to use a spiral integral hose. After the hose is transported to the site, a short stainless steel pipe joint is added to the hose, and a stainless steel outer ring is added to the thin steel wire and brazed. The brazing seam must ensure the tightness and pressure of the pipeline when it is working. The brazing structure has the following characteristics: The shape of the brazing seam wall is more complex, with corrugated, fine steel mesh, etc. As shown in Figure 1. In order to ensure the sealing performance and load-carrying capacity of brazed joints, the quality of brazing is required to be high, and there is sufficient stability in mass production. Because the corrugated hose and the fine steel wire mesh are thin and thin, manual brazing with oxyacetylene flame is very easy to cause overheating. If it exceeds 830℃, stable chromium and titanium oxide will be formed and are difficult to remove, making brazing almost impossible . Therefore, it is required to prevent oxidation during brazing. In welding production practice, due to the influence of its special knots and non-printing factors, it is often difficult to meet the design and process requirements with oxygen and ethylene fast brazing. In order to properly solve this problem, we adopt a new arc brazing process. That is, when the melting electrode arc brazing is performed under the protection of inert gas, the arc is located between the workpiece and the melting electrode, and the surrounding is shielding gas. The solder serves as an electrode of the arc.The brazing area is continuously fed from the welding gun to form the filler metal for the brazing seam. Melting electrode arc brazing is characterized by low melting point of the solder (2% ring silver solder melting point is 8600 ~ 900 ℃), high mechanical strength, and small welding heat affected zone. There is no need to use a corrosive flux during brazing. There is no need to clean after welding. The equipment is easy to operate. It is easy to realize automation