Brazing technology of classification and what are the advantages?

Brazing technology of classification and what are the advantages?

Brazing is one of the three welding method, including fusion welding, brazing and bonding of the three. Brazing process is mainly to use than the weld metal of low melting point metal solder, and then heated to a temperature higher than the weldment and filler metals solder, below the melting temperature of the weldment, then using liquid solder wetting welding pieces of metal, fill the joint clearance and mutual diffusion and base metal, so as to realize a method of connecting the weldment. So compared with other welding methods, brazing process advantages what?
1, when soldering, solder melts, and weldment won't melt, and the temperature of the welding with the different choice of solder, and at room temperature to nearly large areas of the parent metal melting temperature change inside. In order to avoid the base organizations, as well as the change of the performance, you can choose to brazing filler metals, which have lower melting point and welding is no choice.
2, at the time of brazing, welding is often a whole heating or around the brazing seam for uniform heating of large area, therefore, relative distortion of welding and brazing welding head are much smaller than welding residual stress, it is also to ensure the precision of welding.
3 are heavily dependent on liquid filler metals, brazing seam automatically fill the gap after frozen, so as long as the solder, flux and brazing methods selection of good, can mass or many brazing seam welding at the same time or continuous brazing, productivity is very high. In the process of brazing rarely because of the accessibility of the weld structure, and open sex.
4, because the soldering reaction only in parent material of a few microns and even the following interface to dozens of micrometers, so, generally does not involve the deep structure of parent metal, and therefore, more suitable for dissimilar metal stents, and even nonmetallic and nonmetal, the connection between the metal and nonmetal, it is can't do welding method.
5, brazing seam strength and heat resistance were lower than the base metal, and in order to make up the lack of strength, often by increasing the overlap area to solve the problem, so the braze welding head will be more samples of the lap joint methods to increase the weight of the structure, therefore, is more brazing materials.