ElectricWeldingMachineVol.53No.1Jan.2023第53卷第1期2023年1月高强钢点焊熔合界面正向拉伸撕裂失效评价分析金泉军，高明，吕玲芳，曾泳浙江吉利远程新能源商用车集团有限公司，浙江杭州311228摘要：基于界面撕裂和熔核剥离两种模式下焊点的不同应力分布规律，通过应用极限应力理论及Mises应力，计算两种失效模式下高强度钢焊点的最大载荷，推导出界面撕裂失效时的临界熔核直径dcr1=(3/3)(2n+2)t(1-I%)HHAZmax/Hnuggetmax。通过正交试验方法对高强钢焊点正向失效模式进行分析验证，结果发现，当实测熔核直径小于临界熔核直径时，焊点发生明显的界面撕裂模式；当实测熔核直径大于临界熔核直径时，发生明显的熔核剥离模式；焊接电流对高强度钢的焊点熔核直径影响最大，对焊点失效方式有较大影响。关键词：高强度钢；界面撕裂；熔核剥离；正向拉伸；失效分析；熔核直径中图分类号：TG457.11文献标识码：A文章编号：1001-2303（2023）01-0031-07FailureAnalysisofFractureofHighStrengthSteelSpot-weldedJointsaboutCrossTensionTestingJINQuanjun,GAOMing,LVLingfang,ZENGYongZhejiangGeelyNewEnergyCommercialVehicleGroudCo.,Ltd.,Hangzhou311228,ChinaAbstract:Accordingtothedifferentstressdistributionunderinterfacialfracturemodeandbuttonpull-outmode,themaxi‐mumforceonhighstrengthsteelspot-weldedjointsfortwokindsoffailuremodeswereanalysisedandcalculatedbasedonMisescriteriaandultimatestresstheory.Thecriticalwelddiameterdcr1=(3/3)(2n+2)t(1-I%)HHAZmax/Hnuggetmaxforinterfacialtearingfailurewascalculated.Highstrengthsteelwasusedtovalidatethecriticalwelddiameterbytheorthogonaltest.Theresultsshowedthatwhenthemeasurednuggetdiameterwassmallerthanthecriticalnuggetdiameter,interfacialfracturemodeappearedintheweldingnugget;whenthemeasurednuggetdiameterwaslargerthanthecriticalnuggetdiameter,but‐tonpull-outmodeappeared.Atthesametime,theweldingcurrenthadthegreatesteffectonthenuggetdiametertoresis‐tancespotweldingofhighstrengthsteel,andithadagreateffectonthefracturemodeofsold-weldedjoints.Keywords:highstrengthsteel;interfacialfracture;buttonpull-out;cross-tensile;failureanalysis;nuggetdiameter引用格式：金泉军，高明，吕玲芳，等.高强钢点焊熔合界面正向拉伸撕裂失效评价...
