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In-situ observation of microstructural evolution in reheated low carbon bainite weld metals with various Ni contents

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Journal of Iron and Steel Research International 2017年第12期24卷 1206-1214页

作者： Gao-jun Mao Rui Cao Jian-hong Chen Xi-li Guo Yong Jiang Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina State Key Laboratory of Advanced Processing and Recycling of Non ferrous Metals Lanzhou University of TechnologyLanzbou 730050GansuChina atlantic china welding Concumables Inc.Zigong 643000SichuanChina

Microstructural evolution in weld metals was in-situ observed through utilizing a laser scanning confocal microscope at two cooling *** specimens with various nickel contents were adopted for the *** the specimen with low fraction of Ni（≤2 wt.%）,granular bainite microstructure（*** surface relief）transformation from intragranular nucleation site was in-situ observed,while,lath bainite microstructure originating from grain boundary of austenite was in-situ observed for specimens with high mass percentage of Ni（≥4 wt.%）.With increasing nickel content,the transformation temperature *** prior austenite grain size was initially depressed and subsequently coarsened dramatically with the addition of *** microstructure difference was ascribed to various nucleation sites and growth direction in the *** account of those observations,not only the chemical component,cooling rate and microstructure were systematically correlated,but also the microstructural evolution was definite.

关键词： Weld metal Ni content Bainite Nucleation site Growth In-situ observation

Arc and Droplet Behaviors in Horizontal Short-Arc Pulsed Gas Metal Arc welding of 9%Ni Steel with ERNiCrMo-3 welding Wire

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Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 361-376页

作者：刘轶玮华学明吴东升李芳蔡艳王欢杨修荣 Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Hudong-Zhonghua Shipbuilding(Group)Co. Ltd.Shanghai 200129China Zhuhai Cowin welding Equipment&consumables Co. Ltd.Zhuhai 519015GuangdongChina

Short-arc pulsed gas metal arc welding(P-GMAW)was used to solve the dificulties of molten pool spreading and droplet transfer of Ni-based welding *** of short-circuit current was used to reduce *** length stabilizer was used to acquire a proper and stable arc length maintained at the critical position where short circuit starts to ***-arc P-GMAW with or without arc length stabilizer was *** droplet transfer,arc behaviors and weld bead profiles were investigated and compared based on the high-speed photography and observation of weld *** the arc length stabilizer was deactivated,the arc length was unstable and too *** droplet transfer mode was mainly short circuit partial transfer,with only a small part of the droplet transferred into the molten pool,with the characteristics of no obvious necking,a few spatters,small droplet impact,long short circuit duration and high short-circuit *** was also a small proportion of short circuit complete transfer with obvious necking,larger droplet impact,shorter short-circuit duration and lower short-circuit *** arc length stabilizer,droplet transfer modes were short circuit complete transfer and spray *** spray transfer had the largest droplet impact,no short circuit and no *** the arc length stabilizer activated,a deep penetration,a high penetration ratio,a small reinforcement and a large reinforcement factor were *** provides an innovative method to solve the difficulties of droplet transfer and molten pool spreading and eliminate the incomplete fusion in the GMAW of 9%Ni steel with nickel-based alloy welding wire.

关键词： droplet transfer arc behaviors weld bead formation short-arc pulsed gas metal arc welding(P-GMAW) high nickel alloy 9%Ni steel

Status and development trend of the welding consumables industry in china

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china welding 2017年第2期26卷 23-31页

作者： Zhang Huiwen Su Jinhua Chen Jian Harbin welding Institute China Academy of Machinery Science & Technology

We analyzed the status and development of the welding consumables industry in china during the 12th Five-Year Plan （2011 -2015） period, and identified the major problems in the industry. We predicted the development trends that are expected for the ／3th Five-Year Plan （2016 -2020） period. We suggest some specific countermeasures and practices, which the Chinese welding industry should accelerate the transformation-upgrading and coordinated development of the industry and its firms , should work on improving their overall quality to improve the brand,s influence, enlarge their input into research and technology upgrading,and develop a low-carbon green production mode that could be put in place to promote the development of the Chinese welding consumables industry.

关键词： welding consumables development trend

Effect of combinative addition of mischmetal and titanium on the microstructure and mechanical properties of hypoeutectic Al-Si alloys used for brazing and/or welding consumables

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Journal of Rare Earths 2017年第2期35卷 193-202页

作者：王博薛松柏王俭辛林中强 College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Jiangsu Provincial Key Laboratory of Advanced welding Technology Jiangsu University of Science and Technology Zhenjiang 212003 China Zhejiang Yuguang Aluminum Material Co. Ltd. Jinhua 321200 China

Effects of mischmetal（RE） and/or Ti modifier on the microstructure including α-Al dendrites, eutectic Si phases and other secondary phases of Al-Si brazing and/or welding alloys were investigated by differential scanning calorimetry（DSC）, optical microscopy（OM）, scanning electron microscopy（SEM）. The DSC results showed that an addition of RE decreased the eutectic temperature and caused supercooling, promoting the nucleation of eutectic Si crystals. In addition, the maximum temperature of the first endothermic peak varied with the different RE contents, which had a good correlation with the microstructural modification of the eutectic Si phase. The α-Al dendrites were well refined by increasing the cooling rate or adding 0.08 wt.% of Ti. When 0.05 wt.% RE was added to the Al-5Si-0.08 Ti alloy, the morphology of eutectic Si phase was transformed from coarse platelet to fine fibers and the mechanical properties of the resulting welding rod were well improved. Whereas, when excess RE was added, a large number of β-Fe phases appeared and the aspect ratios of β-Fe phases increased. The morphologies and chemical components of two kinds of RE-containing intermetallic compounds（IMCs） were also discussed.

关键词： Al-Si alloy rare earths modification microstructure mechanical properties

Influence of heat input on microhardness and microstructure across the welding interface between stainless steel and low alloy steel

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Baosteel Technical Research 2024年第1期18卷 14-21页

作者： ZHU Min Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai201999China

The welding interface is crucial to the service safety of dissimilar metal weld(DMW)joints between stainless steel(SS)and low alloy(LA)*** status of welding interfaces was prepared by cladding SS consumables to LA steel substrates with different heat inputs via tungsten inert gas arc welding(TIG),followed by a series of microstructural characterizations and hardness *** showed that a hardening and transition layer(TL)would be generated along the welding interface,and the width and hardening degree of the TL would increase with the heat ***,heavy load hardness tests showed that highly severe inhomogeneous plastic deformation and the microcrack would be generated in the interfacial region and the welding interface respectively in the highest heat input sample(1.03 kJ/mm).These results indicate that the increase in heat input would deteriorate the bonding performance of DMW *** microstructural observations showed that the higher hardening degree of the highest heat input sample was mainly attributed to the stronger grain boundary,solution,and dislocation strengthening effects.

关键词： welding interface transition layer heat input microstructure hardness