When the temperature is raised., Ltd. It can prevent oxidation and decarburization and play a protective role. Vacuum high pressure gas quenching heat treatment Taizhou Daxing Heat Treatment Plant (Taizhou 318050, Zhejiang) Wu Shiqiang has many factors that affect the service life of the mold, but the use of a reasonable heat treatment process is very important. When surfacing is used, alloy problems of the welding layer should be considered, such as dilution rate, fusion zone, filter layer and thermal cycle. In the welded state, the metallographic structure is martensite, and sometimes contains pearlite, bainite, and the like.
5. Our factory has achieved good results using vacuum high-pressure gas quenching heat treatment process, especially forming mold. After a period of use, there is a chipping edge in the middle of the die edge (see), and there is also a chipping edge in front of the punch edge. Due to the cooling rate is too fast, the gas stays in the metal.. Since the mold materials are mostly tool steels such as T8 and T10A, and the working conditions are mainly impact resistance and wear resistance, martensite surfacing metal should be used when selecting the surfacing metal material. The partial pressure of oxygen in the furnace is very low, and the surface oxide of the workpiece decomposes at high temperature: 2FeO! 2Fe+2.
3 Selection of die surfacing material Choosing the right metal material for die surfacing is a complicated task. Martensitic surfacing metal, its carbon content is generally 0. According to the traditional repair method, it has to be put into production again, and the edge surfacing repair is now used to achieve good results. Due to its working conditions, structure, material and economic requirements, the ’arc welding’ method is generally used. 4 surfacing welding method Die surfacing is a fusion welding of heterogeneous materials. All have an impact on traditional mold manufacturing and maintenance.
Choose reverse welding with DC welding machine, welding Syringe Mould Manufacturers current 90A, arc length 5. 6 Conclusion The overlay welding process is suitable for the repair of large and complex molds and small and medium batch parts, which can reduce costs and extend the life of the mold. The time is not Less than 45min; the electrode needs to be baked at 250~350: 1~2h at temperature. Because it is pumped into a vacuum, there are very few oxidizing and decarburizing gases in the furnace. The degassing effect of krypton is obvious, so the strength and toughness are significantly improved., Ltd. It is easy to operate, no pollution, and meets the requirements of modern high-quality and low-consumption clean heat treatment