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  本文選題：汽車 + 高強鋼�。� 參考：《華東理工大學(xué)》2016年碩士論文

【摘要】：為了滿足汽車行業(yè)的輕量化制造和強度需求,越來越多的高強鋼被運用于車身結(jié)構(gòu)。車身結(jié)構(gòu)一般采用焊接方式進行連接,電阻點焊因其成本低、易于控制、適于自動焊接等特點成為了車身焊接中最廣泛使用的焊接方法。因此,電阻點焊質(zhì)量是保證白車車身整體強度極為重要的一環(huán),而點焊工藝參數(shù)的選取對點焊質(zhì)量的控制顯得尤為重要。本文選取點焊焊接三要素：焊接電流、焊接壓力、焊接時間作為研究對象,分析了這三個焊接工藝參數(shù)對高強鋼-低碳鋼焊接組合質(zhì)量的影響規(guī)律。采用拉伸實驗和剪切實驗測定點焊的抗拉強度和剪切強度,基于正交實驗設(shè)計方法,采用極差分析和方差分析得到焊接三要素對電焊性能的影響規(guī)律和影響程度。采用顯微金相分析方法,研究了焊接工藝參數(shù)對點焊顯微金相組織的影響規(guī)律。結(jié)果表明：焊接電流、焊接壓力和焊接時間都需要維持在一個合適的水平,過大和過小都不利于形成良好的點焊形貌。另外,汽車車身上點焊的焊點布置形式對汽車總體的結(jié)構(gòu)強度和抗沖擊性能有著顯著的影響,本文基于有限元方法分析了不同的焊點分布形式對搭接構(gòu)件的強度的影響,得到了最優(yōu)的焊點布置形式并對其進行了討論。
[Abstract]:In order to meet the demand of lightweight manufacturing and strength of automobile industry, more and more high-strength steels are used in body structure. The welding method is generally used to connect the body structure. The resistance spot welding has become the most widely used welding method in the body welding because of its low cost, easy to control, suitable for automatic welding and so on. Therefore, resistance spot welding quality is very important to ensure the overall strength of the white car body, and the selection of spot welding process parameters is particularly important to the control of spot welding quality. In this paper, three factors of spot welding: welding current, welding pressure and welding time are selected as the research object, and the influence of these three welding process parameters on the welding quality of high strength steel and low carbon steel is analyzed. The tensile strength and shear strength of spot welding were measured by tensile test and shear test. Based on the orthogonal design method, the influence law and degree of the three factors of welding on the welding properties were obtained by means of range analysis and variance analysis. The effect of welding parameters on the microstructure of spot welding was studied by means of metallographic analysis. The results show that the welding current, welding pressure and welding time need to be maintained at a suitable level, too large and too small are not conducive to the formation of a good spot welding morphology. In addition, the pattern of spot welding on the automobile body has a significant effect on the overall structural strength and impact resistance of the vehicle. This paper analyzes the influence of different distribution forms of solder joint on the strength of the lap member based on the finite element method. The optimal solder joint arrangement is obtained and discussed.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG453.9

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本文編號：2013667