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Ultrasonic vibration assisted tungsten inert gas welding of dissimilar metals 316L and L415

International Journal of Minerals,metallurgy and Materials 2020年第7期27卷 943-953页

作者： Hong-xia Lan Xiu-fang Gong Sen-feng Zhang Liang Wang Bin Wang Li-ping Nie School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Long-life High Temperature Materials Dong Fang Turbine Co.Ltd.Deyang 618000China China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.Deyang 618000China School of Engineering Southwest Petroleum UniversityNanchong 637800China

Ultrasonic vibration assisted tungsten inert gas welding was applied to joining stainless steel 316 L and low alloy high strength steel *** effect of ultrasonic vibration on the microstructure and mechanical properties of a dissimilar metal welded joint of 316 L and L415 was systematically *** microstructures of both heat affected zones of L415 and weld metal were substantially refined,and the clusters ofδferrite in traditional tungsten inert gas(TIG)weld were changed to a dispersive distribution via the ultrasonic *** ultrasonic vibration promoted the uniform distribution of elements and decreased the micro-segregation tendency in the *** the application of ultrasonic vibration,the average tensile strength and elongation of the joint was improved from 613 to 650 MPa and from 16.15%to31.54%,*** content ofΣ3 grain boundaries around the fusion line zone is higher and the distribution is more uniform in the ultrasonic vibration assisted welded joint compared with the traditional one,indicating an excellent weld metal crack resistance.

关键词： ultrasonic vibration dissimilar metal welding microstructure mechanical properties micro-segregation electron backscatter diffraction

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Characterization of dissimilar welding between 304 Stainless Steel and Gray Iron Using Nickel Coated Electrode

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Materials Sciences and Applications 2021年第12期12卷 614-621页

作者： Jesús García-Lira Enrique Curiel-Reyna Yajaira Curiel-Razo Alberto Lara-Guevara Ignacio Rojas-Rodríguez Facultad de Estudios Superiores-Cuautitlán Universidad Nacional Autónoma de México Cuautitlán-Izcalli Edo México División de Posgrado Facultad de Informática Universidad Autónoma de Querétaro Ave. de las Ciencias S/N Querétaro México División Industrial Universidad Tecnológica de Querétaro Querétaro México

This paper presents the study carried out to study the microstructure and mechanical properties of AISI 304 stainless steel and gray iron, in order to recognize the effect of welding parameters on the joint. The shielded metal arc welding technique was applied with a 3.2 mm diameter nickel coated electrode under preheating and post heat conditions at 350°C. Vickers hardness test and metallographic analysis were carried out at the heat affected zone and at the interface to determine the effect on mechanical and metallurgical characteristics. Vickers hardness differences among joint areas were directly related to microstructural changes. There are no significant differences in AISI 304 hardness, but the hardness increased at the heat affected zone and decreased at the filler metal. Grey iron hardness at the heat affected zone was even lower and more slightly superior than grey iron hardness.

关键词： dissimilar metal welding Gray Cast Iron Heat Affected Zone Preheat and Post Heat Conditions Stainless Steel AISI 304

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Effect of heat treatment temperature on dissimilar welded joint

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China welding 2013年第3期22卷 60-65页

作者：陈文静陈群燕王永景 Materials Institute Southwest Jiaotong University Chengdu 610031 Shandong Vocational of Industry Zibo 256414 School of Materials Science and Engineering Xihua University Chengdu 610039

The dissimilar metals 1Crl8Ni9 and 16MnR are welded by shielded metal arc welding process using electrode A312. The corrosion experiments are carried out on welded joint samples, which is as-welded and post-weld heat treatment at 650 ℃, 750 ℃ and 850 ℃, for 2 h in 70% sodium hydroxide solution. EDS and X-ray diffraction analysis are carried out on the samples after corrosion. Average corrosion rate calculation and microhardness measurement are conducted on both as- welded and post-weld heat treatment samples. The results indicate that average corrosion rate of as-welded joint metal is smaller than that of post-weld heat treatment joint metal. Compared with that of post-weld heat treatment at 750 ℃ and 850 ℃ for 2 h, the average corrosion rate of welded joint after post-weld heat treatment at 650 ℃ for 2 h increases greatly.

关键词： dissimilar metal welding welded joint heat treatment average corrosion rate

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Research on microstructure and properties of boron/Q235 steel laser welded dissimilar joints under synchronous thermal field

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China welding 2023年第4期32卷 38-48页

作者：周广涛黄涛郭玉龙黄奇凡张波 College of Mechanical Engineering and Automation Huaqiao UniversityXiamen 361021China Master Studio Luoyuan Senior Vocational High SchoolFuzhou 350600China Xiamen Hicemic New Material Technology Co. Ltd.Xiamen361021China Shandong Weiqiao Pioneering Group Co. Ltd.Binzhou 256200China

The mechanical mismatch effect frequently occurs in the dissimilar materials welded joints, thus leading to plastic gradient at the interface between the weld and heat-affected zone(HAZ). In this work, the boron steel and Q235 steel were selected for laser tailor welding,which obtained boron/Q235 steel tailor-welded blanks(TWBs). The method of welding with synchronous thermal field(WSTF) was utilized to eliminate the mismatch effects in TWBs. The WSTF was employed to adjust cooling rates of welded joints, thereby intervening in the solidification behaviors and phase transition of the molten pool. Boron/Q235 steel was welded by laser under conventional and WSTF(300-600 ℃) conditions, respectively. The results show that the microstructure of weld and HAZ(boron) was adequately transitioned to ferrites and pearlites instead of abundant martensite by WSTF. Meanwhile, the discrepancy of microhardness and yield strength between various regions of welded joints was greatly reduced, and the overall plasticity of welded joints was enhanced by WSTF. It is indicated that WSTF can effectively contribute to reducing plastic gradient and achieving mechanical congruity in welded joints by restraining the generation of hardbrittle phase, which could significantly improve the formability of TWBs in subsequent hot stamping.

关键词： dissimilar metal welding laser tailor welded blank synchronous thermal field boron steel microstructure mechanical property

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Effect of Al-foil addition on microstructure and temperature field of laser fusion welded joints of DP590 dual-phase steel and AZ31B magnesium alloy

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Transactions of Nonferrous metals Society of China 2020年第10期30卷 2669-2680页

作者： He ZHOU Jin-shui LIU Dian-wu ZHOU Tao TAO College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

The experiments of laser fusion welding with Al-foil addition was carried out for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium *** field was simulated by COMSOL finite element software for steel/magnesium laser fusion *** results show that when Al-foil is added,some defects,such as pores,cracks and softening in heat affected zone(HAZ),can be avoided in welding joint,the bonding strength of steel/magnesium joints is increased,heat transfer between steel and magnesium is *** the case of adding Al-foil,welding pool is divided into two parts,the upper and lower pools contact each other but do not mix,the transition layer at the interface between the upper and lower molten pools mainly contains Al−Fe phases,such as AlFe,Al2Fe and AlFe3,and these new phases are helpful for promoting the metallurgical connection between the upper and lower molten ***,adding Al-foil laser fusion welding is an effective way in joining steel to magnesium alloy.

关键词： dissimilar metal welding microstructure numerical simulation Al-foil

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