Study on Welding Process Parameters of HG70E Steel for a 190T Mining Dump Truck
This paper analyzes the welding performance of 16 and 25 mm thick HG70E high-strength welded structural steel,and determines the initial preheating temperature by calculating carbon equivalent and cold crack susceptibility coefficient.In the welding test,the welding consumables are matched with equal strength,the reasonable welding parameters are selected,the temperature control equipment is used to strictly control the temperature of the welding process,and the mechanical properties of the welded joints are tested to study their welding process.The results show that the hardenability of HG70E steel for the test is obvious,and there is a tendency to weld cold cracks,so it must be preheated before welding,and the welding temperature and cooling rate after welding must be strictly controlled,which can effectively inhibit the appearance of cold cracking and reheat cracks,ensure the welding quality,and meet the material welding standards.The reasonable welding parameters are determined through the test,which provides a reference for the practice of HG70E steel welding process.
万方数据
维普
