JCO雙面三絲自動埋弧焊生產(chǎn)ASTM 1035鋼管焊接裂紋的控制
Control of Weld Cracking of ASTM 1035 Steel Tube as Developed during Manufacture Operation with JCO Double-side 3-wire Automatic SAW Process
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摘要: 當(dāng)ASTM 1035鋼碳當(dāng)量0.58%時，淬硬傾向嚴(yán)重，焊接時易產(chǎn)生裂紋。通過研究ASTM 1035鋼焊接裂紋的產(chǎn)生機(jī)理，制定合理的焊接工藝，結(jié)合生產(chǎn)現(xiàn)場實踐證明：通過采取焊接預(yù)熱措施；選用具備低碳、硫、磷、無鎳或低鎳，韌性指標(biāo)優(yōu)良，強(qiáng)度匹配適中的焊材；控制焊縫成形系數(shù)，降低熔敷金屬的稀釋率，減少焊縫金屬中的碳、硫、磷含量；采取“小電流”、“慢焊速”，嚴(yán)格控制焊接熱輸入；并配合以合縫管端間隙、引熄弧板裝配，內(nèi)外焊保溫輸送和定位焊清根等生產(chǎn)現(xiàn)場工藝細(xì)節(jié)控制，可有效減少ASTM 1035鋼管焊接裂紋的產(chǎn)生。Abstract: In case of carbon equivalent as 0.58%，the ASTM 1035 low-carbon steel is apt to have significant quench hardness which often leads to development of cracking during welding operation. Based on study of the mechanisms of the said cracking，proper welding process is prepared. The on-the-site operation with the process proves that the cracking severity can be remarkably reduced by means of a number of on-the-site process detail-control actions，including pre-heating prior to welding，selecting welding consumable containing low contents of C，S and P，and no or low content of nickel and having excellent toughness and well-matching strength，properly controlling the formation factor of the weld，reducing the dilution rate of the deposited metal，reducing the contents of C，S and P of the weld metal，using the small current and slow welding speed techniques，strictly controlling the welding heat input，determining proper pipe-end gap for joining，mounting arc run-on/off tab，temperature-keeping transport of the material during inner welding operation，and back gouging during tack welding，etc.
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