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class="page_odd_time">發(fā)布時間：2021-09-15</time> <div id="rig1ng2kyz" class="page_odd_content">熔硫釜已經(jīng)在各個領(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、直線運輸會引起焊接應(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。對于材質(zhì)剛度比較高的工件時，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，對于預(yù)熱溫度的設(shè)置要求也會越高。<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，所以按照計算以及經(jīng)驗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，實際使用中會產(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="rig1ng2kyz" class="max"> <div id="rig1ng2kyz" class="picture">友情鏈接：</div> <a target="_blank" title="海耐機(jī)邊粉碎機(jī)">海耐機(jī)邊粉碎機(jī)</a> <a 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