高頻焊管焊接接頭的斷裂行為和殘余應(yīng)力的研究.pdf

1、天津大學(xué)碩士學(xué)位論文高頻焊管焊接接頭的斷裂行為和殘余應(yīng)力的研究姓名：劉維申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)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