高頻焊管焊接接頭的斷裂行為和殘余應力的研究.pdf

1、天津大學碩士學位論文高頻焊管焊接接頭的斷裂行為和殘余應力的研究姓名：劉維申請學位級別：碩士專業(yè)：材料加工工程指導教師：張玉鳳20070101ABSTRACTHighfrequencyelectricresistanceweldmakeselectricitycongregatedonthesurfaceofinterfacesbytheskilleffectandtheproximityeffectofhighfrequencyelec

2、tricityThetemperatureofinterfacesrisesveryquicklyandwheninterfacesaremeltedorbecometheconditionofplasticitytheyarepressedtobeaweldedjoint。Asothermethodsofweld，highfrequencyelectricresistanceweldalsoproducesresidualstress

3、Comparedwiththenormalarc—welding，theweldingseamofhighfrequencyelectricresistanceweldareverynarrowSt)therearenewcharacteristicsoftheresidualstressofthehighfrequencyelectricresistanceweldedpipeButthereisnotenoughreportsoft

4、heresidualstressofthehighfrequencyelectricresistancewelduptonowFirst，thisresearchmeasuresthemechanicalcapabilitiesoftheweldingseamandtheHAZThenmeasurestheresidualstressofhighfrequencyelectricresistantweldedpipeusingthece

5、ntral—holemethodandanalysestheresidualstresswithANSYSnonlinearfmiteelementprogramAtlastcomputethevaluesofresidualstresswithstandardB$7910andSINTAPTheresearchmeasuresthemechanicscapabilitiesoftheweldingseamandtheHAZ，inclu

6、dingrigiditytest，pullingtest，impacttest，CTODtestThenmeasurestheresidualstressofhighfrequencyelectricresistantweldedpipeusingthecentralholemethodandanalysestheresidualstressoftheweldingseamintheweldedprocesswithANSYSnonli

7、nearfiniteelementprogramTheexperimentalresultsshowmostlyconformitycomparedwiththesimulateresultsAndthedistributingofresidualstressofhighfrequencyelectricresistantweldedpipecomparedwiththedistributingofnormalarcwelding，bu

8、tthenumericalvaluesaresmallerThisresultisimportanttoweldprojectButwhencalculatedwkhBS7910andSINTAPwefoundthattheresidualstressofhighfrequencyelectricresistanceweldissmallerSOtheformulaeofthetwostandardsarenotavailableKEY