ElectricWeldingMachineVol.53No.1Jan.2023第53卷第1期2023年1月7A52铝合金中厚板MIG焊接工艺优化陈鹏达，徐锴，徐玉君，郭枭，吕晓春哈尔滨焊接研究院有限公司，黑龙江哈尔滨150028摘要：针对7A52铝合金中厚板熔化极惰性气体保护焊（MIG）焊缝成形差、接头系数低等问题，采用半自动MIG、以ER5356焊丝为填充材料对20mm厚7A52铝合金板材进行不同焊接工艺参数下的焊道成形试验。测量不同焊接工艺参数下的焊道熔深、熔宽、余高、润湿角等焊道成形特征，选出最佳工艺参数。采用最佳工艺参数进行20mm厚对接试板的焊接，焊接完成后通过X射线检测、力学性能试验、显微组织观察等测试方法研究对接接头的各项性能。结果表明，ER5356焊丝焊接接头的抗拉强度平均值为302.5MPa，对接接头系数平均值为0.74，试样断裂位置均为焊缝区；接头的弯曲性能良好，未出现裂纹等缺陷；焊接接头焊缝区硬度值最低，为焊接接头最薄弱区域，与拉伸试验试件断裂位置相符合；焊接接头和熔敷金属的力学性能较好。关键词：工艺参数；接头系数；焊道成形；抗拉强度中图分类号：TG457.14文献标识码：A文章编号：1001-2303（2023）01-0084-07OptimizationonMIGWeldingProcessingParametersof7A52AluminumAlloyMedium-ThicknessPlateCHENPengda,XUKai,XUYujun,GUOXiao,LVXiaochunHarbinWeldingInstituteCo.，Ltd.，Harbin150028，ChinaAbstract:Inthispaper，aimingattheproblemsofpoormetalInertgasWelding（MIG）weldformingandlowjointcoeffi‐cientof7A52medium-thicknessplate,taking7A52aluminumalloyastheresearchobject,semi-automaticMIGwasusedtoconductweldbeadformingtestsonER5356wireunderdifferentweldingparameters.Afterthetest,weldbeadformingcharacteristicssuchasweldpenetration,weldwidth,weldbeadremaining-height,weldwettingangleunderdifferentweld‐ingprocessingparametersweremeasured.Optimizetheoptimalprocessingparameters.Theoptimizedprocessparameterswasusedtoweldthedepositedmetalandbuttingjoint.Afterthewelding,throughthetestingmethodsincludeX-raydetec‐tion,mechanicalpropertytest,microstructureobservation,theperformanceofweldingbuttingjointusingER5356wirewasstudied.Theresultsshowthattheaveragetensilestrengthforbuttingjointis302.5MPaandthejointcoefficientis0.74re‐spectively.Thefracturepositionofthebuttingjoint...
