Due to the high hardness and brittleness of hard alloys, it is not easy to weld as other materials. Zhuzhou Chuangrui Cemented Carbide Co., Ltd. has sorted out the welding methods of cemented carbide for you, hope it can help you.
Because of the large difference in physical functions between tungsten carbide and carbon steel, brazing and disperse welding are still feasible and useful welding methods. In addition, some new welding methods such as tungsten electrode inert gas maintenance arc welding (TIG), electron beam welding (EB-W), laser welding (LBW), etc. are also actively being discussed and explored, which may be used in cemented carbide welding in the future.
Brazing brazing is a traditional and widely used cemented carbide welding method. In the brazing methods of cemented carbide and steel, according to the heating method, there are gas flame brazing, furnace brazing, vacuum brazing, induction brazing, resistance brazing and laser brazing skills. Either way, the melting point of the brazing metal is lower than that of the base metal and is distributed in the joint by capillary attraction. The connected products include oil well drill bits, hot and cold stamping dies, powder metallurgy molds, rolls, cutting tools and measuring tools, rock drilling tools, woodworking tools, etc.
Brazing metal is the filler material used in brazing, which plays an important role in the function of the brazing joint. Solder function is one of the important factors that determine the quality of brazing.
The gas flame brazing equipment is simple, it can be heated and welded with multiple flames according to the shape of the workpiece. The brazing metal is mostly made of filamentous or flake copper-based and silver-based brazing filler metal, which is suitable for single piece and small batch production, but the selection of gas welding torch and heat treatment after brazing and other uncertain elements are more, and the quality and reliability of brazing are small.
The yield of tungsten carbide cutters for induction brazing, resistance brazing and brazing in the furnace is high, and the quality is relatively stable, but the equipment and skills are more messy, the scale and shape of the workpiece are required to be higher, and vacuum brazing can achieve high brazing quality, but the equipment is expensive and the skills are difficult
As a new type of welding heat source, laser has the characteristics of fast heating speed, narrow heat affected zone, post-welding deformation and small residual stress, especially in weakening the embrittlement of the joint fusion zone, which has common advantages, which makes it also used in the welding of cemented carbide. Therefore, when selecting the welding method, it should be mainly suitable, and usually the brazing in the furnace can satisfy the tool brazing request
(1)Dispersed welding
Vacuum dispersion welding and HIP dispersion welding can be applied to the welding of cemented carbide. In vacuum dispersion welding, there are many factors that affect the quality of the joint, such as the composition of the material, the quality of the welded surface, the vacuum degree, the data of the center sandwich, and the heating and cooling rate, but the most important factors are temperature, pressure and time. The shear strength of the weld usually improves with the addition of the welding time, because the extension of the welding time can make most of the micro-bumps on the welded surface disappear, the touch area is obviously added, the dispersion of atoms is more abundant, and the welding rate can be significantly improved
(2)Tungsten inert gas maintenance arc welding
TIG welding, as a new method of bridging cemented carbide and steel,it is still in the experimental period
(3)Electron beam welding
Electron beam welding has the advantages of high heating power density, small deformation after welding, large weld depth-width ratio, and wide scale adjustment of standard parameters, and because the welding heat process is extremely short, it may become a new method for welding cemented carbide by controlling the dispersion of elements to a certain extent.
Post time: Jan-25-2024