Laser welding is a high-precision welding method, which has the advantages of narrow weld, small heat-affected zone and small welding deformation. However, in practical applications, the improvement of welding strength has always been a problem faced by laser welding. In order to make full use of the advantages of laser welding and improve the welding strength, it is necessary to optimize from many aspects.
First of all, choosing the right laser welding material is the key to improve the welding strength. In laser welding, the welding material is heated instantaneously by a high temperature laser beam and cooled and solidified in a molten state. Therefore, the choice of welding materials determines the microstructure and mechanical properties of the weld. Under normal circumstances, alloy materials commonly used in welding engineering, such as stainless steel, aluminum alloy and titanium alloy, can provide better welding strength.
Secondly, the reasonable selection of welding process parameters is an important factor to improve welding strength. The process parameters of laser welding include power, speed, clearance and working distance. Appropriate power and speed can ensure the heat exchange between the laser beam and the material, and avoid problems such as weld penetration caused by excessive heat input and incomplete weld wounds caused by too late. Proper clearance and working distance can ensure that the liquid material has enough time to fill and diffuse during welding, thus enhancing the bonding strength of the weld.
Third, the preparation before welding emphasizes that weld preparation is the key to improve welding strength. Clean the surface of the welded joint before welding, and ensure that there is no oil, rust and impurities. At the same time, the appropriate welding method should be selected according to the characteristics of the welding material, such as flat butt welding, laser fillet welding and laser side welding. The fineness of these preparations will directly affect the stability and consistency of the welding strength.
Post-welding treatment is also an important part of improving welding strength. After the welding is completed, the welded joint usually requires heat treatment or heat tempering treatment to eliminate the stress and deformation generated during the welding process. In addition, welded joints can also be subjected to sectional metallographic observation to assess welding quality and welding strength.
In short, improving the strength of laser welding needs to consider a number of factors. Only through the selection of appropriate welding materials, optimization of welding process parameters, fine weld preparation and reasonable post-treatment, can we achieve high quality welding results.
Post-welding treatment is also an important part of improving welding strength. After the welding is completed, the welded joint usually requires heat treatment or heat tempering treatment to eliminate the stress and deformation generated during the welding process. In addition, welded joints can also be subjected to sectional metallographic observation to assess welding quality and welding strength.
In short, improving the strength of laser welding needs to consider a number of factors. Only through the selection of appropriate welding materials, optimization of welding process parameters, fine weld preparation and reasonable post-treatment, can we achieve high quality welding results.
