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id="okgo0qm" class="banner banner_s"> <ul> <li><a href="/" title="熔硫釜"><img src="/skin/default/images/ny1.jpg" /></a></li> <li><a href="/" title="硫銨飽和器"><img src="/skin/default/images/ny2.jpg" /></a></li> <li><a href="/" title="自控熔硫釜"><img src="/skin/default/images/ny3.jpg" /></a></li> </ul> <ol></ol> <div id="wuoikuu" class="lef_rig"> <span><img src="/skin/default/images/prev.png" /></span> <span><img src="/skin/default/images/next.png" /></span> </div> </div> </section> <section class="page"> <div id="sqcsiue" class="page_address"> <div id="sqky0cc" class="max"> <span>當(dāng)前位置：</span> <a href="/">首頁</a> > <a href="/xw/">新聞動(dòng)態(tài)</a> > <a href="/xw/wt/">技術(shù)問答</a> </div> </div> <div id="awcww0g" class="page_odd"> <div id="igm02kk" class="max"> <div id="w0ako40" class="page_r page_r_s"> <div id="qcgu0qy" class="page_odd_title">怎么降低熔硫釜的焊接熱裂紋的產(chǎn)生？</div> <time class="page_odd_time">發(fā)布時(shí)間：2021-09-15</time> <div id="cq0y8eq" class="page_odd_content">熔硫釜已經(jīng)在各個(gè)領(lǐng)域得到普及。但是很多人并不清楚熔硫釜焊接過程焊接熱裂紋產(chǎn)生的原因，以至于后期使用造成產(chǎn)品性能的下降。<br />1.規(guī)范熔硫釜的焊接流程。大電流、直線運(yùn)輸會(huì)引起焊接應(yīng)力，進(jìn)而帶來焊接熱裂紋。在條件允許的情況下，采用小電流多層焊接，降低熱裂紋的傾向。對(duì)于材質(zhì)剛度比較高的工件時(shí)，常采用預(yù)熱法。預(yù)熱一方面降低冷卻速度和冷卻過程中產(chǎn)生的拉應(yīng)力，另一方面改善結(jié)晶條件，降低化學(xué)和物理不均勻性。鋼的含碳量以及工作剛度越大，對(duì)于預(yù)熱溫度的設(shè)置要求也會(huì)越高。<br />（2）焊接程序。焊接性相同的材料，焊接工藝差別性導(dǎo)致熱裂紋傾向的不同。不同的焊接順序帶來的連鎖焊接應(yīng)力差別大，所以按照計(jì)算以及經(jīng)驗(yàn)選擇合理的焊接順序，降低焊接應(yīng)力。<br />2.熔硫釜焊接冷裂紋：壓力容器焊接中的冷裂紋大部分在焊接的接頭，少部分分在焊接管上。冷裂紋并不是馬上出現(xiàn)，可能是幾天后。這些裂紋被稱為延遲裂紋。延遲裂紋剛開始并不能發(fā)生，實(shí)際使用中會(huì)產(chǎn)生較大后果，所以比普通裂縫危害更大。<br />冷裂紋的表現(xiàn)形式有幾種：邊界裂紋、焊道下裂紋和根部裂紋。邊界裂紋從焊縫和母材的結(jié)合處開始，延伸到母材。焊縫下方的裂紋位于焊縫下方的近焊縫區(qū)域，不會(huì)有大的延伸，根部裂紋是由焊縫根部的間隙形成的，并延伸到母材或焊縫中。</div> </div> </div> </div> </section> <section class="url"> <div id="sg08gy8" class="max"> <div id="q0c8use" class="picture">友情鏈接：</div> <a target="_blank" title="氣體檢測(cè)儀檢定裝置">氣體檢測(cè)儀檢定裝置</a> <a target="_blank" 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