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                                                                                                                                    埋弧焊直縫鋼管

                                                                                                                                    作者:滄州市大唐管業有限公司來源:http://www.locasity.com/時間:2018/06/14 點擊:0

                                                                                                                                    埋弧焊直縫鋼管采用的焊接工藝為埋弧焊技術,采用填充物焊接,顆粒保護焊劑埋弧。生產的口徑可以達到1500mm,LSAW是埋弧焊直縫鋼管的英文簡稱,埋弧焊直縫鋼管的生產工藝有JCOE成型技術、卷制成型埋弧焊技術。當口徑較大時可能用兩塊鋼板進行卷制,這樣會形成雙焊縫的現象。
                                                                                                                                    可以執行的標準GB/T3091-2008低壓流體鋼管生產標準,GB/T9711.1-2 -1997石油天然氣鋼管生產使用標準,還可以執行美國API 5L 管線鋼管執行標準。生產材質:Q195A-Q345E;245R;Q345QA-D;L245-L485;X42-X70。承壓參數主要有2ST/T ,S為屈服強度,T為壁厚?,F在埋弧焊已經發展成為,有雙絲埋弧焊,還有多絲埋弧焊,效率更進一步提高。廣范用于鋼結構、打樁、流體輸送、長輸管道等地方。

                                                                                                                                      橋梁工程用埋弧焊直縫鋼管直縫焊接鋼管生產流程:

                                                                                                                                      1. 板探:用來制造大口徑埋弧焊直縫鋼管的鋼板進入生產線后,首先進行全板超聲波檢驗;

                                                                                                                                      2. 銑邊:通過銑邊機對鋼板兩邊緣進行雙面銑削,使之達到要求的板寬、板邊平行度和坡口形狀;

                                                                                                                                      3. 預彎邊:利用預彎機進行板邊預彎,使板邊具有符合要求的曲率;

                                                                                                                                      4. 成型:在JCO成型機上首先將預彎后的鋼板的一半經過多次步進沖壓,壓成"J"形,再將鋼板的另一半同樣彎曲,壓成"C"形,*形成開口的"O"形

                                                                                                                                      5. 預焊:使成型后的直縫焊鋼管合縫并采用氣體保護焊(MAG)進行連續焊接;

                                                                                                                                      6. 內焊:采用縱列多絲埋弧焊(*多可為四絲)在直縫鋼管內側進行焊接;

                                                                                                                                      7. 外焊:采用縱列多絲埋弧焊在直縫埋弧焊鋼管外側進行焊接;

                                                                                                                                      8. 超聲波檢驗Ⅰ:對直縫焊鋼管內外焊縫及焊縫兩側母材進行100%的檢查;

                                                                                                                                      9. X射線檢查Ⅰ:對內外焊縫進行100%的X射線工業電視檢查,采用圖象處理系統以保證探傷的靈敏度;

                                                                                                                                      10. 擴徑:對埋弧焊直縫鋼管全長進行擴徑以提高鋼管的尺寸精度,并改善鋼管內應力的分布狀態;

                                                                                                                                      11. 水壓試驗:在水壓試驗機上對擴徑后的鋼管進行逐根檢驗以保證鋼管達到標準要求的試驗壓力,該機具有自動記錄和儲存功能;

                                                                                                                                      12. 倒棱:將檢驗合格后的鋼管進行管端加工,達到要求的管端坡口尺寸;

                                                                                                                                      13. 超聲波檢驗Ⅱ:再次逐根進行超聲波檢驗以檢查直縫焊鋼管在擴徑、水壓后可能產生的缺陷;

                                                                                                                                      14. X射線檢查Ⅱ:對擴徑和水壓試驗后的鋼管進行X射線工業電視檢查和管端焊縫拍片;

                                                                                                                                      15. 管端磁粉檢驗:進行此項檢查以發現管端缺陷;

                                                                                                                                      16. 防腐和涂層:合格后的鋼管根據用戶要求進行防腐和涂層。


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