Study On Welding Repair Technology Of H13 Hot Work Die Steel

As the production of mold steel,the typical representative of the consumption of energy,the production cost is higher in the manufacturing industry.There,hot work die steel as one of many kinds of die steel,it works under the alternating hot and cold environment,the working environment is bad,which leads to the large stress and deformation.The mold itself has a long production cycle and a high production cost.If the problem occurs in the course of its service,it is easy to scrapped it.This will result in a substantial increase in production costs and a manifestation of energy consumption.For the above reasons,for the mold steel service in the process of some cracks and other phenomena,has become the subject of most scholars,mainly to study the remedial methods and improve its use after remedial performance.Most of the current due to the cause of cracks caused by the failure of hot work die steel,the widespread use of welding technology for local remediation,which not only for enterprises to save production costs,but also to maximize the control of energy waste.But the welding repair can not just play a repair crack this level,but also should pay attention to the use of hot work die steel after repair,welding process should be fully taken into account the hot work die steel welding,targeted design process,so that repair After the hot work die steel to meet its service needs.As the most representative hot working die steel,H13 hot working die steel is widely used in the machining industry is widely used.Because of its service environment has been in the hot and cold alternating state,will make it more complex internal stress and cracks,resulting in cracks,and sometimes serious will cause the entire mold failure.Due to the hot mold steel itself is expensive,mold manufacturing process is complex,if only because of a crack and give up the use,will make a substantial increase in production costs.So it is of great significance to solve the problem of repair after wear or crack failure and to extend the service life of mold.In this paper,H13(4Cr5MoSiV1)steel as the research object,for hot work die steel Cr,Mo,V and other major chemical elements on the H13 steel welding performance,as well as welding materials and welding process on the weld structure and performance,TIG welding method for H13 hot work die steel welding repair.According to the repair methods and the requirements of the actual production,to determine the H13 steel welding process and post-weld heat treatment process,,characterization of the microstructure and mechanical properties of the weld.The organization and mechanical properties were measured.Two different welding wires were used for welding under the condition of preheating(different preheating temperature)andun-preheated state.The mechanical properties of the welded specimens were examined by Rockwell hardness tester and micro hardness tester.The effects of preheating temperature on the microstructure and mechanical properties of welds were analyzed.The results showed that: compared with H13 steel wire,using homemade flux cored welding specimen grain finer,micro hardness distribution is more uniform,which reduces the stress concentration,in the weld and heat affected zone,and increase the service life of the use of the mold after repaired.Preheating control group experimental results show that the fine grain samples slightly H13 steel welding wire,flux cored wire made grain preheating welding specimen slightly decreased,indicating that preheating can also be done to a certain extent Play the role of grain refinement.