小規(guī)格埋弧焊鋼管補(bǔ)焊工藝探討

Discussion on Weld Repair of Small-sized SAW Steel Pipes

摘要: 針對小規(guī)格埋弧焊鋼管在進(jìn)行單面焊雙面成型補(bǔ)焊時(shí)存在的補(bǔ)焊焊縫質(zhì)量差、易形成內(nèi)焊瘤等問題,華北石油鋼管廠在生產(chǎn)L360MB鋼級Φ355.6mm×5.6mm埋弧焊鋼管時(shí)采用了一種新的焊縫補(bǔ)焊工藝,即加裝陶瓷襯墊+CO₂氣體保護(hù)焊打底+CO₂氣體保護(hù)焊（手工電弧焊）填充、蓋面。采用該補(bǔ)焊工藝后,補(bǔ)焊的焊縫不僅成型良好,無內(nèi)焊瘤,而且具有較好的力學(xué)性能,質(zhì)量滿足相關(guān)標(biāo)準(zhǔn)要求。

Abstract: Addressing the problems relating to the single-side welding and dual-side formation weld repair of small-sized SAW steel pipes such as poor weld seam quality and tendency of internally overlapping,a newly- developed weld repair process is used by Huabei Petroleum Steel Pipe Plant for producing Φ355.6 mm×5.6 mm SAW pipe in steel grade L360MB. The said process involves ceramic lining + prime CO₂ gas shielded welding + filling and covering with CO₂ gas shielded welding（manual electric arc welding）. Thanks to employment of this weld repair process,the weld-repaired seam is well formed and free of inner overlap,and possesses good mechanical properties,and the quality is up to relevant requirements of applicable standard.