久久国产福利国产秒拍

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310s不銹鋼管
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310s不銹鋼管焊接環境要求

發布者:管理員 發布時間:2021-03-26閱讀:32次

 

310s不銹鋼管焊接環境要求

310s不銹鋼管焊接環境的控制耐熱鋼焊接受環境的影響較大,當風速過大,尤其是管內穿堂風過大時,易使焊接接頭淬硬,含氫量也會增加,因此施焊時應盡可能把管線兩端暫時堵死。當環境濕度、310s不銹鋼管風速等超過GB/T150-1989規定后,應禁止施焊。

310s不銹鋼管焊接工藝參數的控制焊接時應嚴格控制工藝參數,不允許超出規定范圍,垂直固定位置的橫口焊接時最小熱輸入不允許小于20kJ/cm,否則應提高預熱溫度來進行補償,以防止冷卻速度過快。

后熱消氫處理焊后應立即進行消氫處理310s不銹鋼管,溫度為250~300℃,保溫1h,如果焊后能及時進行熱處理,可省去后熱工藝,也能達到消氫的目的。

焊后熱處理能消除焊接殘余應力,改善焊縫組織和力學性能,并能降低接頭的含氫量,是防止延遲裂紋的主要措施之一。熱處理工藝為:自由升溫到300℃后,以150~180℃/h的溫升速度升到740℃±10℃,保溫50min后,以150~200℃的速度降溫,降至300℃后,自由降溫。310s不銹鋼管熱處理方法為電加熱法,加熱寬度為坡口兩側100mm,保溫層寬度為600mm,保溫層厚度為100mm。

 

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久久国产福利国产秒拍
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