Welding Stress/Deformation Control And Processing Technology Optimization Of Thin-Wall Casing Of High Temperature Alloy

With the development and improvement of welding technology in the world,the requirements for deformation control of welded structures are getting higher and higher.For large sheet metal thin-walled casing welding deformation laws and control technology,the following efficient mechanical processing methods,engineering experience is still insufficient.In this paper,the thin-walled welding casing is used as the research object.With the help of the welding numerical simulation technology,the welding process method,the welding deformation control technology,the stress method after welding and the whole process process after the combination are optimized.By controlling the welding deformation,reducing the combined machining allowance,controlling the stress,optimizing the processing program and processing parameters,the production efficiency of the product can be improved.First of all,the welding process scheme of two kinds of welding methods and four forms of residual distribution in the aero engine superalloy is studied,and the welding deformation simulation is carried out,which is verified by the production test.Under the same allowance distribution,the axial cumulative deformation of the 0.8mm thickness of the thin-walled high temperature alloy welding casing is 2.5mm,and the axial cumulative deformation 1.7mm of the binding automatic argon arc welding is obtained.According to the simulation and production verification test,the automatic argon arc welding is selected,and the welding deformation control is realized by combining internal restraint,and the engineering application and on-site processing are completed.Secondly,the ultrasonic impact test and process exploration of high temperature alloy thin-walled casing after welding are carried out.The stress,microstructure and properties of weld and near weld of GH3536 material are compared and analyzed by ultrasonic impact.The stress effect of ultrasonic shock removal is compared with that of heat treatment.The test results show that after ultrasonic impact,the yield strength of the specimen reaches 770 MPa,and the bending angle is greater than or equal to 180 degrees without cracks.Under the experimental conditions of 815 and 110 MPa,the carrying time is greater than 42 hours,and the elongation is greater than or equal to 20%.The ultrasonic impact stress can produce a comprehensive effect on the original stress state of the weld,showing the trend of stress homogenization,the average stress value of about 200 MPa of the beneficial compressive stress,and the performance of the test sheet meets the standard requirements of the raw material.Thirdly,on the basis of the improved welding method,the research on the potential of CNC equipment,improving the processing quality and stability of the product and improving the detection efficiency are researched on the basis of reducing the allowance and stress of the combined machining,and a set of practical cases for the NC machining process for the thin-walled box is developed.The cutting speed is increased by 30-40m/min to 50-60 m/min.The improved process reduces processing time by more than 50% and improves processing efficiency by more than 1 times.Finally,the research results are used to guide the manufacturing process of large sheet metal thin wall machine,improve the production efficiency and reduce the cost of test verification,and establish a complete and efficient welding and processing technology of sheet metal thin-wall casing.