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Impact toughness variations of EH36 weld metal treated by CaF_(2)–SiO_(2)–MnO submerged arc welding flux

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Journal of Iron and Steel Research(International) 2023年第9期30卷 1873-1878页

作者： Ming Zhong Da-ming Guo Somnath Basu Cong Wang Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Metallurgical Engineering and Materials Science Indian Institute of Technology BombayMumbai 400076MaharashtraIndia

Fused ternary CaF_(2)–SiO_(2)–MnO fluxes have been manufactured and applied to join EH36 shipbuilding steel under high heat input submerged arc *** fluxes have been designed to clarify the effect of MnO content in CaF_(2)–SiO_(2)–MnO flux on the impact toughness of the weld metal,with the added amount of MnO from 10 to 50 wt.%at the expense of CaF_(2).With the increase in MnO content,the Charpy impact energy increases first and then decreases,experiencing a maximum value at 30 wt.%*** of the weld metals has also been studied to account for impact toughness *** has been demonstrated that the highest acicular ferrite volume fraction in the weld metal is achieved at 30 wt.%MnO,which is concurrent to the maximum value of Charpy impact *** is believed that the Mn and O content variations in the weld metal contribute synergistically to such an interesting phenomenon.

关键词： submerged arc welding CaF_(2)–SiO_(2)–MnO flux Shipbuilding steel Impact toughness Microstructure

arc characteristics of submerged arc welding with stainless steel wire

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 772-778页

作者： Ke Li Zhi-sheng Wu Cui-rong Liu Feng-hua Chen College of Materials Science and Engineering Taiyuan University of Science and Technology

The arc characteristics of submerged arc welding （SAW） with stainless steel wire were studied by using Analysator Hannover （AH）. The tests were carded out under the same preset arc voltage combined with different welding currents. By comparing the probability density distribution （PDD） curves of arc voltage and welding current, the changes were analyzed, the metal transfer mode in SAW was deduced, and the characteristics of a stable arc were summarized. The analysis results show that, with an increase of welding parameters, the short-circuiting peak in the PDD curves of arc voltage decreases gradually until it disappears, and the dominant metal transfer mode changes from flux-wall guided transfer to projected transfer and then to streaming transfer. Moreover, when the PDD curves of arc voltage are both unimodal and generally symmetrical, the greater the peak probability and the smaller the peak span, the more stable the arc becomes.

关键词： submerged arc welding electric arc characteristics stainless steel wire metal transfer

Effect of submerged arc welding Flux Component on Softening Temperature

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Journal of Iron and Steel Research(International) 2006年第2期13卷 65-68页

作者： SUI Shao-hua CAI Wei-wei LIU Zhi-qiang SONG Tian-ge ZHANG An Department of Materials Science and Engineering Harbin Institute of Technology Weihai 264209 Shandong China Inspection Institute of Boiler Pressure Container at Weihai Weihai 264209 Shandong China Anshan Iron and Steel Company Anshan 114002 Liaoning China

Based on simplex algorithm of optimal design, the multicomponent mixture regression model was used to investigate physical properties of submerged arc welding flux. The effect of complex interaction of seven components in agglomerated flux on softening temperature was analyzed. The results indicate that the interaction of MgO-TiO2-CaCOa-AI20a increases the softening temperature of flux, but the additions of CaF2 and ZrO2 can decrease the softening temperature.

关键词： simplex algorithm multicomponent mixture regression model agglomerated flux softening temperature submerged arc welding

Research on submerged arc welding wire for X100 pipeline steel

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China welding 2011年第2期20卷 56-62页

作者：毕宗岳刘海璋井晓天牛辉 College of Material Science and Engineering Xi＇ an University of Technology Xi＇ an 710048 Welded Pipe Research Institute of Baoji Petroleum Steel Pipe Co. Ltd Baoji 721008.

According to the study of the microstructure and properties of X100 pipeline steel, the welding consumable-wire based on Mn-Ni-Mo-B-Ti alloy system was successfully designed and developed. The yield strength of the deposited metal of the developed welding wire was 695 MPa, the tensile strength was 810 MPa, and Charpy impact energy was 92 J at negative 20 ℃ when matching with BSG-SJ101H1 sintered flux. The results of the weldability test for X100 pipeline steel which adopting this developed wire showed that the tensile strength of the weld was 827 MPa, 185 J of Charpy impact energy（ -10 ℃ ） , 97% of section of shear and the weld had good strength and toughness matching when the welding speed got to 1.7 m/min. The microstructure and fracture appearance of the weld were analyzed by using metallographic microscope, scanning electron microscope （SEM） and laser confocal microscope, the results indicated that the microstructure was mainly granular bainite in the weld metal, and the fracture was dimple with 200 - 300 μm depth presenting a typical ductile fracture characteristics. The test of welding wire with different content of Ni and Cr element indicated that Ni was better than Cr in improving the strength and toughness of weld metal.

关键词： X100 pipeline steel submerged arc welding welding wire

Effect of electrochemical reactions on oxygen contamination of droplet metal in direct current submerged arc welding

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China welding 2013年第4期22卷 53-57页

作者：李晓泉初雅杰杨宗辉贺显聪 School of Material Engineering Nanjing Institute of Technology

Agglomerated fluxes with different basicity index designed in laboratory were used to study electrochemical reactions between slag and metal in submerged arc welding under both power *** droplet metal oxygen and nitrogen contents were measured using oxygen-nitrogen instrument in order to analyze indirectly metallurgy electrochemical reactions taking place in cathode and anode of welding *** results show that just in the period of droplet growth at the tip of consumable electrode the electrochemical oxygen contamination is produced in the case of direct current electrode positive polarity whereas electrochemical oxygen lost in electrode negative ***,the results indicate that the basicity index of molten slag has great influence upon electrochemical *** basicity index increasing,the effect of oxygen transferring resulted from electrochemistry becomes more evident for reacting dynamics depended on ion characteristics of molten *** effect of basicity index on metal-slag electrochemical reaction is contrary to traditional thermo-chemical reaction and therefore it is necessary to be considered as a metallurgy factor.

关键词： Basicity index Electrochemical reaction Oxygen content submerged arc welding

Effect of electrochemical reactions droplet metal in direct current on oxygen contamination of submerged arc welding

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China welding 2013年第4期22卷 53-57页

作者：李晓泉初雅杰杨宗辉贺显聪 School of Material Engineering Nanjing Institute of Technology Nanjing211167

Agglomerated fluxes with different basicity index designed in laboratory were used to study electrochemical reactions between slag and metal in submerged arc welding under both power polarities. The droplet metal oxygen and nitrogen contents were measured using oxygen-nitrogen instrument in order to analyze indirectly metallurgy electrochemical reactions taking place in cathode and anode of welding arc. The results show that just in the period of droplet growth at the tip of consumable electrode the electrochemical oxygen contamination is produced in the case of direct current electrode positive polarity whereas electrochemical oxygen lost in electrode negative polarity. Furthermore, the results indicate that the basicity index of molten slag has great influence upon electrochemical reaction. With basicity index increasing, the effect of oxygen transferring resulted from electrochemistry becomes more evident for reacting dynamics depended on ion characteristics of molten slag. The effect of basicity index on metal-slag electrochemical reaction is contrary to traditional thermo-chemical reaction and therefore it is necessary to be considered as a metallurgy factor.

关键词： basicity index oxygen content electrochemical reaction submerged arc welding

Fuzzy logic control strategy for submerged arc automatic welding of digital controlling

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China welding 2008年第3期17卷 55-59页

作者：何宽芳黄石生周漪清王振民 School of Mechanical and Automotive Engineering South China University of Technology

A microcomputer control system based on 80C320 and a switching regulation of wire feeder were designed. A correction factor based double model fuzzy logic controller （FLC） was introduced to achieve welding digital and intellectualized control by means of wire feeding speed feedback. The controller has many functions such as keyboard input, light emitting diode （LED） display and real-time intellectualized control of welding process etc. The controlling performance influenced by the coefficient of correction function was discussed. It was concluded by the experiments the relation between the coefficient of correction function and welding quality, when the coefficient of correction function is great, the dynamic character of controller is better, when the coefficient of correction function is small, the sensitivity character of controller is better. Experimental results also show that digital and fuzzy logic control method enable the improvement of appearance of weld and stability of welding process to be achieved in submerged arc automatic welding.

关键词： submerged arc welding microcomputer control correction function fuzzy logic control

Ferrite features in simulated transition zone of EH36 shipbuilding steel submerged arc welded by CaF_(2)-SiO_(2)-MnO fluxes

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Journal of Iron and Steel Research(International) 2024年第4期31卷 790-796页

作者： Ming Zhong Dong Hu Da-ming Guo Somnath Basu Cong Wang Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Department of Metallurgical Engineering and Materials Science Indian Institute of Technology BombayMumbai 400076MaharashtraIndia

Ferrite features in the simulated transition zone welded with CaF_(2)-SiO_(2)-MnO fluxes containing various MnO contents have been *** laser scanning microscopy has been applied to simulate the thermal cycling of the transition zone and the phase transformations during cooling have been in-situ *** has been found that the appearance temperature for ferrite side plate decreases with increasing Mn content in the weld metals caused by MnO content ***,growth rates for both ferrite side plate and acicular ferrite are significantly enhanced with a higher Mn content of weld ***,from the statistical fractions of salient microstructures,for all samples,the acicular ferrite,grain boundary ferrite,and polygonal ferrite take over more than 90%.It has also been demonstrated that with the increase in Mn content,the ferrite side plate fraction increases slightly from 5%to 10%and the acicular ferrite fraction shows a tendency of first increasing and then decreasing,which experiences the maximum with the flux containing 30 wt.%*** phenomenon is believed to be controlled by the O and Mn contents in weld metals synergistically.

关键词： submerged arc welding Transition zone Phase transformation Microstructure

Effects of welding wire composition and welding process on the weld metal toughness of submerged arc welded pipeline steel

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 65-70页

作者： De-liang Ren Fu-ren Xiao Peng Tian Xu Wang Bo Liao Key Lab of Metastable Materials Science ＆ Technology and College of Materials Science ＆ Engineering Yanshan University Qinhuangdao 066004 China Department of Materials Science and Engineering Shijiazhuang Railway Institute Shijiazhuang 050043 China Steel Pipe Works of North China Petroleum Qing County 062658 China

The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the optimal contents of alloying elements in welding wires can improve the low-temperature impact toughness of weld metals because the proeutectoid ferrite and bainite formations can be suppressed, and the fraction of acicular ferrite increases. However, the contents of alloying elements need to vary along with the welding heat input. With the increase in welding heat input, the contents of alloying elements in welding wires need to be increased accordingly. The microstructures mainly consisting of acicular ferrite can be obtained in weld metals after four-wire submerged arc welding using the wires with a low carbon content and appropriate contents of Mn, Mo, Ti-B, Cu, Ni, and RE, resulting in the high low-temperature impact toughness of weld metals.

关键词： pipeline steel welding wire submerged arc welding impact toughness acicular ferrite welding heat input