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    焊接材料對(duì)X70直縫埋弧焊管焊縫組織性能的影響

    Effect by Welding Material on Microstructure Properties of X70 SAWL Pipe

    • 摘要: 針對(duì)因鋼板原料的化學(xué)成分發(fā)生較大變化，使得原焊材與母材出現(xiàn)焊接不匹配，造成X70鋼級(jí)管線鋼直縫埋弧焊管焊縫的低溫沖擊韌性不合格的現(xiàn)象，采取兩種焊絲進(jìn)行焊接試驗(yàn)，通過觀察和檢測(cè)焊縫顯微組織、力學(xué)性能，研究焊接材料對(duì)X70鋼級(jí)直縫埋弧焊管焊縫組織性能的影響。試驗(yàn)結(jié)果表明：在采用相同的焊接工藝參數(shù)焊接同批次同規(guī)格鋼管時(shí)，選用Mn、Si、Cr、Ti含量較高的焊絲進(jìn)行焊接，焊管焊縫中先共析鐵素體和針狀鐵素體晶粒更為細(xì)小，低溫沖擊數(shù)值較高，韌性較好。

       

      Abstract: The welding tests with two types of welding wires are conducted addressing the problem that owing to the remarkable change of the chemical composition of the blank steel plate which causes the mismatching between the primary welding material and the base metal,and in turn causes the nonconformance of the weld seam low-temperature impact toughness of the SAWL pipe.Based on observation and testing of the microstructure and mechanical properties of the weld seam,the effect by the welding material on the weld seam microstructure properties of the X70 SAWL pipe is analyzed.The test results show that when using the welding wire containing rather high contents of Mn,Si,Cr and Ti to weld the steel pipes of the same batch and the same size with the same welding process parameters,the pro-eutectoid ferrite and the acicular ferrite grains in the weld seam are much thinner,the low-temperature impact toughness value is higher,and the toughness is better.

       

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