小直徑高厚徑比螺旋縫焊管的制造難點(diǎn)與解決措施
Manufacture Difficulties Concerning Small-sized High-D/S Spiral Welded Pipe and Related Countermeasures
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摘要: 分析Φ219 mm×8 mm（Q235B）小直徑高厚徑比螺旋縫焊管在生產(chǎn)過程中出現(xiàn)的成型、焊接難點(diǎn)——錯(cuò)邊、成型縫“噘嘴”、裂紋和內(nèi)焊工裝安裝空間小及焊縫外觀形貌控制難等問題，并提出改進(jìn)措施。分析認(rèn)為：縮短機(jī)臂前端第一個(gè)小輥與遞送邊的距離至60～110 mm，增加1號(hào)與3號(hào)梁的中心距，合理設(shè)置2號(hào)梁壓下量等，可減少錯(cuò)邊；優(yōu)選成型角在46°～60°，立輥輥面錐角在2°～3°，增加單個(gè)軸承輥單側(cè)高度等，可減少成型縫“噘嘴”；降低殘余應(yīng)力，減少鋼管成型過程中的前進(jìn)阻力及帶鋼邊緣擠厚量等，可減少裂紋。Abstract: Analyzed here in the paper are the difficulties as encountered with forming and welding processes during manufacture of the Φ219 mm×8 mm(Q235B) small-sized, hi-D/S spiral welded pipe, including misalignment, weld peaking, crack and insufficient space for mounting internal welding tools as well as hard controlling of the apparent morphology of the weld.Accordingly relevant countermeasures are also proposed.The analysis suggests that the misalignment occurrence can be reduced by shortening the distance between the first roller at the front section of the arm and the feeding side to 60~110 mm, increasing the center distance between Beam 1 and Beam 3, and properly setting the screw down value of Beam 2;the weld peaking can be reduced by optimizing the forming angle range as to 46°~60°, the taper angle of the vertical roll surface as 2°~3°, and increasing the height of the lateral side of each bearing roller;and that cracks can be minimized by reducing the residual stress, the forward resistance and the extrusion thickness at the steel strip edge during the forming process of the steel pipe.
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