A Brief Introduction To Brazing Technology

Brazing is a method of joining components by using a metal material with a lower melting point than the component being joined. The component and the brazing material are heated to a temperature higher than the brazing material's melting point but lower than the component's melting point. The liquid brazing material wets the base material, fills the joint gap, and diffuses with the base material to achieve the connection of the Welded Brass Terminal Assemblies and the connected components. According to the melting point of the brazing material, there are: soft brazing, where the brazing material's melting point is lower than 450°C; hard brazing, where the brazing material's melting point is higher than 450°C. According to the temperature of the brazing process, there are: high-temperature brazing; medium-temperature brazing; low-temperature brazing. For different materials, the classification temperatures vary. According to the heating method, there are: flame brazing; furnace brazing; induction brazing; resistance brazing; soldering iron brazing, etc.

The adaptability of brazing is wide, it can weld most metals and some non-metals, meeting the processing requirements of the Welded Brass Wall Switch Contacts; the accessibility of brazing is good, for welds that are inaccessible in space, brazing can be used to complete them; the precision of brazing is high, for high-precision and complex components, multiple weld seams can be welded at one time, with high efficiency; the heating temperature of brazing is much lower than that of fusion welding, and it has a smaller impact on the microstructure and properties of the base material; the deformation of the weldment is small, especially when using uniform heating for brazing, the welding deformation can be reduced to the minimum level, and the size accuracy of the weldment can be easily guaranteed. However, brazing also has its disadvantages, mainly including: lower strength; poorer heat resistance; since most of them are lap-type (butt) joints, the consumption of base material increases, and the joints are heavy.

The filler metal used during brazing to form the brazed joint is called the brazing filler metal and is an important consumable material for manufacturing Precision Welding for Brass Parts. According to the melting point, it is classified as soft brazing filler metal (below 450℃), hard brazing filler metal (above 450℃), and high-temperature brazing filler metal (above 950℃); according to the chemical composition (metal elements), there are: those referred to as "×" base brazing filler metals, such as nickel-based brazing filler metal, tin-based brazing filler metal, silver-based brazing filler metal, etc. Brazing flux, also known as fluxing agent, its function is to remove oxides on the surface of the base material and the liquid brazing filler metal, protect the base material and the brazing filler metal from further oxidation during heating, and improve the wettability of the brazing filler metal on the surface of the base material. Similarly, the brazing flux and the fluxing agent also have soft and hard types; according to the application, they can be divided into: aluminum brazing flux; powdered brazing flux; liquid brazing flux; gas brazing flux; paste brazing flux; non-cleanable brazing flux, etc.

Most brazing operations involve the use of both the brazing filler metal and the brazing flux for the welding process. However, there are cases where brazing can be performed without the use of a flux, and this characteristic is also applicable to the production of Welded Brass Socket Contacts. During brazing, the strength of the brazed joint is lower than that of the base material. To increase the strength, a lap joint form is often used. The length of the lap joint is typically 3 to 4 times the thickness of the plate, but not exceeding 15mm. For pipe materials, they are usually brazed using a socket connection. Before brazing, the surface of the weldment is cleaned using mechanical or chemical methods to remove the oxide film and dirt. To prevent the liquid brazing filler from flowing freely, a flow inhibitor is often applied to the surface of the weldment. Excessive or insufficient assembly clearance will affect the function of the capillary tube, reducing the strength of the brazed joint, and excessive clearance will result in waste of the brazing filler.

The main process parameters of brazing are the brazing temperature and the holding time. Precisely controlling these parameters is the key to ensuring the quality of Custom Brass Welded Components. The brazing temperature is generally 25 to 60 degrees Celsius higher than the melting point of the brazing filler metal. Excessively high or low temperatures are not conducive to ensuring the quality of the brazed joint. The holding time of brazing should allow sufficient interaction between the metal of the welded part and the brazing filler metal. The shorter the holding time, the stronger the interaction between the brazing filler metal and the base metal. For larger gaps and larger welded parts, a longer holding time should be adopted. After brazing, most of the brazing agent residues have a corrosive effect on the brazed joint and also hinder the observation of the brazed joint. Therefore, it is necessary to clean them up.

Our Welded Brass Terminal Assemblies are precisely manufactured based on the aforementioned mature brazing process. Throughout the entire process, we strictly control key parameters such as brazing temperature and holding time. We select suitable brazing materials and fluxes, and adopt standard butt and socket connection methods. This effectively ensures the firmness and dimensional accuracy of the product joints, completely avoiding the strength and deformation issues that are prone to occur in the brazing process. They perfectly meet the usage requirements of various precision welding scenarios.

Customers from all walks of life are welcome to inquire about the details of Brazed Contact Assemblies. Place orders as needed, and we will provide you with high-quality products and services through professional techniques and strict quality control!