Research On Welding Process Of GH536 Thin-walled Structural Parts

Superalloy thin-walled sheet metal parts are typical parts of aero-engine.With the increase of engine delivery units year by year,the processing of parts can not meet the requirements of aero-engine industry for high quality,high efficiency and low cost.Therefore,it is of great significance to effectively control welding deformation and improve the processing efficiency of parts by optimizing welding structure and welding methods.GH536 superalloy thin-walled welded casing is a typical structure in aeroengine.Deformation and deformation control during the welding process of thin-walled structural parts are still inexperienced in engineering practice.In this paper,thin-walled sheet metal structural parts are used as typical parts to optimize and improve the whole process flow of welding method,welding deformation control and welding stress removal method of superalloy thin-walled structural parts,so as to improve the production and processing efficiency of the products.Taking GH536 superalloy thin-walled structure as the research object,the optimization and improvement of welding method,deformation control method in welding process,welding joint parameter test and removal test were carried out,and the engineering application and field processing improvement were completed.It can be seen from the test results that adjusting the waveform,frequency and welding amplitude of GH536(2mm thick plate)in penetrating workpiece can reduce or even eliminate pinpoint defects,effectively reduce the generation of gas holes and improve the quality of weld forming.GH536 specimens were welded by electron beam welding(EBW).The tensile properties of the joints at room temperature were similar to those of the base metal.The comparison between the joints of GH536 EBW and argon arc welding was carried out.The results show that the performance of EBW joints is better than that of argon arc welding joints.The deformation of thin-walled superalloy parts was analyzed.The results show that reasonable welding sequence can effectively control the welding deformation of parts;good welding fixture can effectively reduce the welding deformation in the welding process;through single numerical simulation of fillet weld,the change of parts was analyzed.The shape regularity is about 2.3 mm contraction along the radial direction.The stress,structure and properties of GH536 material and weld seam of actual parts were analyzed by ultrasonic impact stress relief,and compared with heat treatment.The experimental results verify the feasibility of using ultrasonic impact stress relief.It can be concluded from the test that for GH536 material with 2.0 mm thickness,ultrasonic impact stress relief can produce a comprehensive effect on the original stress state of the weld.The stress performance tends to be homogeneous,and the material performance is similar to that of the original material,but it does not play a role in correcting the deformation.The research method and process parameters are used to guide the production and manufacture of superalloy thin-walled structural parts,which improves the production efficiency and controls the welding deformation.According to the characteristics of double-layer thin-walled runner welded structure and the properties of GH536 superalloy material,the typical welding process of double-layer thin-walled runner welded structure was developed: cleaning before welding-assembling electron beam welding-heat treatment-laser cutting-assembling positioning welding-argon arc welding-post-welding heat treatment.