异种铝合金薄板自动双丝焊研究

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1、硕士．论文异种铬台金薄板自动双辑挥研究摘要针对5mm异种(5083和6061)铝合金板，采用自动双丝熔化极惰性气体保护焊技术，进行焊接性研究，探索适于薄板异种铝合金自动双丝焊单面焊双面成形工艺参数范围。在此基础上，运用稳健设计法对焊接工艺进行优化设计，并通过对试验结果信噪比的统计分析，得出各个工艺参数之间的最佳组合。试验验证结果与分析结果相符，表明最佳工艺参数稳定性较好。焊缝外观检测，焊接接头组织、成分以及性能分析表明，焊缝正、反面成形庭好，焊缝内部无缺陷，焊接接头热影响区较窄，焊接接头强度178MPa，达到母材强度的74．2％。运用基于稳健设计的回归分析法建立了焊接接

2、头6061侧热影响区宽度与焊接电流、焊接电压以及坡口角度之间的多元线性同归数学模型。方差分析结果表明各个参数与热影响区宽度之间存在显著的线性相关性，证明分析得到的多元线性回门力程有效，为今后创建铝合金自动双丝焊接头性能预测与控制系统打下基础。关键词：铝合金，奴丝焊，单面焊双面成形，稳健设计，回归分析硕}论文异和键台合薄扳自动设缒焊研究AbstractTheweldingprocessofdissimilaraluminiumalloy5083and6061with5mmthicknesswasstudiedbyautomatictwin—wireMIGwelding．T

3、herangeofweldingprocessparameterswhichwassuitablefortheprocessofone—sideweldingwithbackformationwasobtained．ThebestsynthesisofvariousprocessparametersiseducedbyusingtheRobustDesigntooptimizeweMingprocessandthestatisticalanalysisoftheSignalNoiseRatiointheexperimentalevidences．Theresultsof

4、theproventestaccordedWiththeanflyfis，anditshowedthatthestabilityoftheprocessparameterswasexcellent．Appearanceinspectionanicrostructureobservation，EDAXanalysisandpropertyinspection-oftheweldingjointshowedthatthemoldingofthetwosidesofweldinglinewasgood．Therewasnodefectintheweldingline．Theh

5、eataffectedzone(HAZ)oftheweldingjointwasnalTOW．Andthejointstrengthcouldreach178MPawhichwas74．2％comparedwiththatofbasemetal．OnthebaseofRobustDesign，theRegressionAnalysiswasadoptedtoestablishthemultiplelinearregressionmathematicalmodelsrelatedtothewidthofHAZonweldingjointinsideof6061，weldi

6、ngcurrent，weldingvoltageandgrooveangle．TheanalysisofvarianceshowedthatthereisalineardependencerelationshipbetweenvariousparametersandtheHAZwidth．Rprovedthatthemultiplelinearregressionequationwasavailable．Theresultscouldbeapplicabletothejointstrengthforecastandcontrolofthealuminiumalloyus

7、ingautomatictwin—wirewelding．Keywords：AluminiumAlloy,Twin-wireWelding，One—sideWeldingwithBackFormation，RobustDesign，RegressionAnalysisⅡ碗}论艾异和铊台金薄板自动权缒揖研究l绪论1．1选题意义铝及其台金是有色金属中用途较广的轻金属之一。它密度小、重量轻、比强度高、导电与导热性好且具有较好的耐腐蚀性。随着近代机械制造工业如航空、航海、汽车工业的发展；石油化工、电信和原子能及空间技术等新型工业的崛起，铝合金的使