SA210GrA1/304L不锈钢复合钢管的焊接工艺与接头性能分析
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摘要
使用国产焊条E308-16焊接SA210GrA1/304L不锈钢复合钢管,对焊缝进行金相观察及拉伸、弯曲、冲击试验,并对断口形貌进行电子扫描分析(SEM)。结果表明:用ER70S-6焊丝氩弧焊打底,焊接电流为116~117A,用E308-16焊条进行过渡焊和盖面焊,焊接电流为68~76A,电弧电压均为18 V,可获得性能良好的焊接接头。打底层焊缝组织为铁素体和珠光体,过渡层与盖面层焊缝组织为奥氏体,未出现大面积的脆性组织。焊缝的抗拉强度为600MPa,断后伸长率为41%,过渡层的焊缝区20℃冲击吸收功大于65 J,焊接接头的韧性比较好,弯曲试验后焊缝处未出现明显裂纹。
The SA210 GrA1/304 L stainless steel composite pipe was welded with domestic welding rod E308-16. The metallographic structure of the welded joint was observed. The tensile, bending and impact tests of the welded joint were carried out and the fracture morphology was analyzed by scanning electron microscopy(SEM). The results show that the welded joint with good performance can be obtained by the argon arc welding with ER70S-6 wire for rendering, and welding for transition and covering with E308-16 electrode. The welding currents are 116-117A and 68-76A respectively, and the arc voltage is 18 V. The microstructure of the rendering layer of welded joint is ferrite and pearlite, and the transition layer and covering layer of welded joint are austenite. There is not large area of brittle microstructure in welded joint. The tensile strength of the welded joint is 600 MPa, and the elongation is 41%. The impact absorbing energy at 20 ℃ of weld zone of the transition layer is bigger than 65 J. The toughness of welded joint is well, and there is not obvious crack on welded joint after bending test.
The SA210 GrA1/304 L stainless steel composite pipe was welded with domestic welding rod E308-16. The metallographic structure of the welded joint was observed. The tensile, bending and impact tests of the welded joint were carried out and the fracture morphology was analyzed by scanning electron microscopy(SEM). The results show that the welded joint with good performance can be obtained by the argon arc welding with ER70S-6 wire for rendering, and welding for transition and covering with E308-16 electrode. The welding currents are 116-117A and 68-76A respectively, and the arc voltage is 18 V. The microstructure of the rendering layer of welded joint is ferrite and pearlite, and the transition layer and covering layer of welded joint are austenite. There is not large area of brittle microstructure in welded joint. The tensile strength of the welded joint is 600 MPa, and the elongation is 41%. The impact absorbing energy at 20 ℃ of weld zone of the transition layer is bigger than 65 J. The toughness of welded joint is well, and there is not obvious crack on welded joint after bending test.
引文
[1]姜殿忠,何志涛,张发荣.碱回收锅炉水冷壁焊接工艺[J].电焊机,2012,42(2):91-92.
[2]李以善,高才,唐杰.碱回收锅炉用复合管的焊接工艺和组织[J].焊接技术,2011,40(4):32-35.
[3]谢小强,孙国华,王红娜,等.不锈钢复合钢空冷器丝堵式管箱的两种焊接工艺比较[J].热加工工艺,2016,45(17):211-212.
[4]廖慧敏,宋凯强,曹艳平,等.奥氏体不锈钢复合钢板焊接工艺及接头组织研究[J].热加工工艺,2012,41(17):148-150.
[5]付现桥,徐敬,卜明哲,等.X70/316L不锈钢复合钢管焊接接头性能研究[J].电焊机,2014,44(4):182-185.
[6]Wang Qinying,Wang Xian Zong,Luo Hong,et al.A study on corrosion behaviors of Ni-Cr-Mo laser coating,316 stainless steel and X70 steel in simulated solutions with H2S and CO2[J].Surface&Coatings Technology,2016,291:250-257.
[7]吕世雄,王廷,冯吉才.20G/316L双金属复合管弧焊接头组织与性能[J].焊接学报,2009,30(4):93-98.
[8]Gardner L,Bu Y,Francis P,et al.Elevated temperature material properties of stainless steel reinforcing bar[J].Construction and Building Materials,2016,114:977-997.
[9]Wang Ke,Wang Jihui,Hu Wenbin,et al.Evaluation of temperature effect on the corrosion process of 304 stainless steel in high temperature water with electrochemical noise[J].Materials and Design,2015,82:155-163.
[2]李以善,高才,唐杰.碱回收锅炉用复合管的焊接工艺和组织[J].焊接技术,2011,40(4):32-35.
[3]谢小强,孙国华,王红娜,等.不锈钢复合钢空冷器丝堵式管箱的两种焊接工艺比较[J].热加工工艺,2016,45(17):211-212.
[4]廖慧敏,宋凯强,曹艳平,等.奥氏体不锈钢复合钢板焊接工艺及接头组织研究[J].热加工工艺,2012,41(17):148-150.
[5]付现桥,徐敬,卜明哲,等.X70/316L不锈钢复合钢管焊接接头性能研究[J].电焊机,2014,44(4):182-185.
[6]Wang Qinying,Wang Xian Zong,Luo Hong,et al.A study on corrosion behaviors of Ni-Cr-Mo laser coating,316 stainless steel and X70 steel in simulated solutions with H2S and CO2[J].Surface&Coatings Technology,2016,291:250-257.
[7]吕世雄,王廷,冯吉才.20G/316L双金属复合管弧焊接头组织与性能[J].焊接学报,2009,30(4):93-98.
[8]Gardner L,Bu Y,Francis P,et al.Elevated temperature material properties of stainless steel reinforcing bar[J].Construction and Building Materials,2016,114:977-997.
[9]Wang Ke,Wang Jihui,Hu Wenbin,et al.Evaluation of temperature effect on the corrosion process of 304 stainless steel in high temperature water with electrochemical noise[J].Materials and Design,2015,82:155-163.