Download - 材料加工物理-焊接( welding ) 第一部分 焊接电弧物理 1.1 概述 焊接 (Welding): 通过加热或加压,或两者并用,用或不用填充材料,使焊接件达到原子结合的加工方法。
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welding 1.1(Welding):1 1 (fusion welding) 2 (pressure welding) 3 (brazing, soldering)
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1.21.2.1:welded jointbase metalheat affect zonebond lineareaweld123
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1.2.2.1.welding arc(cathodearc columnanode103104mm 36% 2400K 43% 2600K 21% 6000~8000KAe UAe
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molten pool1231core wire2welding wire3coating1)23)4)
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Advance metal materialHigh Strength low alloy steelpipeline steel)ULCB Ultra- low carbon bainitic)Ultra-fine grain steel acicular ferrite steel
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base metalweld metal bond zoneheat affect zone1aproeutectoid ferritePF770~680grain boundary ferriteGBFbferrite side plateFSP 700~550
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dintergrain FerriteIGF650~450 efine grain ferriteFGF500650fbainiteB 500gmartensiteM 300
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23(heat affect zoneHAZ(weld thermal cycle) VTmt 1)11002)850~1100 3)700~850 )HAZ1LBZlocal brittle zone
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2UCGHAZUnaltered coarse grain HAZ3IRCGHAZIntercritically reheated CGHAZ4SRCGHAZ (Subcritically reheated CGHAZ HAZ80~200m (Oxide Metallurgy) CRcontrolled rolling controlled coolingHAZ
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1)narrow gap welding 2~5mm0.5mmHAZ1mm10mm2) laser beam welding20mm electron beam welding250mm plasma arc welding20mm3) 4)
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Under water welding 12)3)4)5)
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1212345Welding in space
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