7020鋁合金焊接工藝對焊接殘余應(yīng)力與應(yīng)變的影響研究
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關(guān)鍵詞：7020鋁合金；焊接仿真；預(yù)熱；熱源輸入；殘余應(yīng)力應(yīng)變
中圖分類號：TH162 文獻(xiàn)標(biāo)志碼：A 文章編號：1003-5168(2025)11-0024-04
DOI:10.19968/j.cnki.hnkj.1003-5168.2025.11.006
Research on the Influence of 7O2O Aluminum Alloy Welding Process on WeldingResidualStressandStrain
ZHANG Huayan (Shanghai-Donghu MachineryFactory,Shanghai2O19oo,China)
Abstract: [Purposes] This study aims to investigate the effects of different welding process parameters on residual stress and residual strain in the welding repair of 7O2O aluminum alloy plates, with the goal of determining optimal heat input parameters to optimize welding quality.[Methods]A welding simulation model based on the double-elipsoidal heat source model was established using inert gas-shielded laser welding technology.Finite element analysis was employed to simulate the dynamic thermo一 mechanical coupling process. Multiple experimental parameters,including welding current ( 200～240 （20 A), voltage ( 20～24 V),and initial workpiece temperature (20～300°C ),were examinedto analyze their effects on temperature distribution,residual stress,and residual strain.[Findings] The simulation results indicate that when the welding current was 240 A and the voltage was 24 V,both residual stress and strain were minimized.When the preheating temperature is 200°C ,the residual stress and strain can be significantly reduced,but when the temperature rises to 300° C, the residual strain increases instead. Additionally,the increase in power leads toa rise in the maximum temperature,but hasa limited impacton residual stress.[Conclusions] The optimized welding parameters (240 A current,24 V voltage) combined with 200°C preheating effectively controlled residual stress and strain,providing a theoretical basisfor the welding repair process of 7O2O aluminum alloy plates. Keywords: 7O2O aluminum aloy; welding simulation; preheating; heat sourse input; residual stress-strain
0 引言
焊接變形與殘余應(yīng)力形成機(jī)理的研究發(fā)現(xiàn)，鋁合金焊接過程中的熱-力耦合效應(yīng)是引發(fā)焊接部位變形與殘余應(yīng)力的關(guān)鍵因素。（剩余5782字）