Explain the similarities and differences between diffusion brazing and instantaneous liquid phase di

<> vacuum diffusion welding furnace.

Diffusion welding: under certain temperature, pressure, holding time, protective medium and other conditions, the connection surface of the workpiece only produces microscopic plastic deformation, and the metal atoms known at the interface diffuse each other to form a joint connection method.

Brazing: The method of using a metal material lower than the melting point of the base metal as the brazing metal, heating the weldment and the brazing metal to a temperature higher than the melting point of the brazing metal and lower than the melting point of the base metal, using the liquid brazing metal to wet the base metal, filling the joint gap to realize the method of connecting the weldment, including hard brazing and soldering.

Instantaneous liquid phase diffusion welding: an amorphous film is used as the filler material, and its melting and amorphous measures are completed with the help of inductor heating. Transient liquid phase diffusion welding is an efficient and fast welding method that has been used in pipes, automobiles, and steel bars.

A new generation of environmentally friendly PMA-03 plasma brazing machine.

Plasma brazing machine, completely replacing the traditional brazing equipment, a new generation of brazing equipment without combustible gas. Using IGBT inverter control principle, the flame is very stable during welding, and the whole equipment is light and convenient, suitable for outdoor welding. The welding machine is simple to operate, people who know a little about the welding machine can do it, no special training is required, this product does not need acetylene and other flammable gases, and the safety performance is greatly improved.

Only electricity is needed, and the advantages of using plasma brazing machines in some underdeveloped areas (no oxygen or acetylene, gasoline, etc.) are very obvious. During the soldering process, gas flux can be used directly instead of the traditional manual addition of borax to improve the wettability and fluidity of brazing, so as to reduce the formation of porosity. Improve the tensile strength of the weld, there is no oxidation on the surface during the welding process, and there is no blackening.

There is no need for pickling, which greatly improves the efficiency of the connection.

Diffusion welding refers to the welding method in which the weldments are tightly fitted and kept at a certain temperature and pressure for a period of time, so that the atoms between the contact surfaces diffuse each other to form a connection. The main factors that affect the diffusion welding process and the quality of the joint are temperature, pressure, diffusion time, and surface roughness. The higher the welding temperature, the faster the atoms will diffuse.

The welding temperature is generally a multiple of the melting point of the material. Diffusion welding is a solid-state connection method, which is to achieve a large area of close contact by making a slight plastic deformation of the surface to be welded at a certain temperature and pressure, and after a certain period of heat preservation, through the mutual diffusion and interface migration of atoms between the contact surfaces, so as to realize the metallurgical bonding of parts.

Answer]: Deferred rent A

According to the second and (1) 3 brazing in the first section of chapter 2 of the "installation textbook", item A should be selected.

Analysis] Which sock welding is divided into three categories: strong flame carrying signs, strong resistance and induction brazing.

Among the three major categories of welding, Biwei diffusion welding belongs to a large category of pressure welding. The detailed categories can be referred to the figure below