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METAL INERT GAS WELDING OF 2519-T87 high strength aluminum alloy

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Chinese Journal of Mechanical Engineering 2007年第4期20卷 32-35页

作者： XU Lianghong TIAN Zhiling ZHANG Xiaomu PENG Yun State Key Laboratory of Advance Steel Process and Products Central Iron ＆ Steel Research Institute Beijing 100081 China Structure Material Institute Central Iron ＆ Steel Research Institute Beijing 100081 China

20 mm thick plates of 2519-T87 high strength aluminum alloy have been *** effects of the compositions of filler wires,the heat input and the compositions of shielding gas on the mechanical properties and microstructure of the welded joint have been *** results indicate that finer microstructure,better mechanical properties and higher value of hardness of HAZ can be obtained by using lower heat *** use of Ar/He mixed shielding gas has several advantages over pure Ar shielding *** the increase of the proportion of He in the mixed shielding gas, the grain size of the weld metal as well as porosity susceptibility *** the volume ratio of He to Ar reaches 7：3,the porosity and the grain size of weld metal reach the minimum,and the porosity can be further reduced by filling some CO2.

关键词： high strength aluminum alloy Wire Heat input Shielding gas

Simulation on the deformation controlling of T-joint LBW with auxiliary heat source for high strength aluminum alloy

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China Welding 2015年第1期24卷 44-49页

作者：董皕喆杨武雄肖荣诗王启明 Institute of Laser Engineering Beijing University of TechnologyBeijing 100124

To avoid the angular deformation of aluminum alloy T-joint weldments, a new method named welding with auxiliary heat source is proposed. The welding simulation is performed with the commercial finite element software Abaqus and FORTRAN programme encoding a special conical heat source with Gaussian volumetric distribution of flux. The influence of the local model on the temperature, residual stress, and welding deformation distributions is investigated. The findings show that angular deformation achieved through numerical computation completely consists with the experimental result which has proved the effectiveness of the finite element methods developed. Various measurements performed on small-scale welded test specimens provide a data base of experimental results that serves as a bench mark for qualification of the simulation result. Finally, the residual stress and strain states in a T-joint are predicted.

关键词： laser beam welding auxiliary heat source high strength aluminum alloy angular deformation

Stability of fiber laser-MIG hybrid welding of high strength aluminum alloy

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China Welding 2021年第3期30卷 7-11页

作者： Han Yongquan Han Jiao Chen Yan Yao Qinghu Wang peng School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The effect of fiber laser on MIG arc was investigated with 8 mm 7075-T6 high strength aluminum alloy as base *** arc shape,droplet transfer form and electrical signal in the process of MIG welding and laser-MIG hybrid welding were *** stability of the hybrid welding process was evaluated by standard deviation *** results show that with the increase of laser power,a large number of laser-induced plasma enters the arc column area,providing more conductive channels,which makes the heat of MIG arc more concentrated and the short circuit transition *** to the continuous effect of laser,the keyhole becomes a continuous electron emission source,and a stable cathode spot will be formed near the keyhole,which enhances the stability of MIG arc at the base current *** using the method of standard deviation analysis,the voltage standard deviation of single MIG welding arc and laser-MIG hybrid arc within 4 seconds was *** standard deviation of single MIG arc voltage was 1.05,and the standard deviation of MIG arc voltage in laser-MIG hybrid welding was 0.71–0.86,so the hybrid welding process was more stable.

关键词： high strength aluminum alloy fiber laser-MIG hybrid welding arc behavior electrical signal

Spreading Behavior and Hot Cracking Mechanism of Single Tracks in high strength Al–Cu–Mg–Mn alloy Fabricated by Laser Powder Bed Fusion

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Acta Metallurgica Sinica(English Letters) 2023年第9期36卷 1454-1464页

作者： Xiaojia Nie Ze Chen Yang Qi Hu Zhang Haihong Zhu College of Ship and Ocean Naval University of EngineeringWuhan430033China Department of Basic Courses Naval University of EngineeringWuhan430033China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China

Laser powder bed fusion(LPBF)technology is a high-precision metal additive manufacturing(AM)*** to the high specific strength of high strength aluminum alloys,high strength aluminum alloys fabricated by LPBF have broad application prospects in the field of light ***,high strength aluminum alloys have high hot cracking *** this study,an analysis of the hot cracking susceptibility as a function of processing parameters is presented for single tracks of LPBF processed(LPBFed)high strength Al–Cu–Mg–Mn *** hot cracking in single tracks of LPBFed Al–Cu–Mg–Mn alloy is solidification cracking based on the experimental observations of *** Rosenthal simulations and spreading behavior of a single droplet,the critical scanning speed of single track with balling phenomenon was *** was found that when the laser power was 200 W,the scanning speed exceeded 440.1 mm/s,the droplet will not be able to spread completely,which is consistent with the experimental result of 500 mm/*** the calculation and analysis of the microstructure and the existence time of the molten pool,it was pointed out that the reduction in the liquid phase caused by the high scanning speed,the shortening of the solidification time and the high stress caused by the high-temperature gradient promoted the generation of hot *** summary,this work contains a practical guide to optimize processing parameters of LPBFed Al–Cu–Mg–Mn alloys,which provides a basis for fabricating thin walls and cubic samples without hot cracking.

关键词： Laser powder bed fusion high strength aluminum alloy Hot cracking Single track

Effect of variable polarity frequency on 2A14-T6 aluminum alloy welds using HPVP-GTAW process

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China Welding 2014年第1期23卷 40-45页

作者：李玉龙从保强齐铂金刘方军杨明轩 School of Mechanical Engineering and Automation Beihang University Beijing 100191.

Hybrid ultrahigh frequency pulse variable polarity gas tungsten arc welding （HPVP-GTAW） for 2A14-T6 high strength aluminum alloy was carried out and the effects of variable polarity frequency with constant pulse current frequency 40 kHz on weld bead geometry, microstrueture and microhardness were analyzed. Experimental results indicate that, compared to that of the conventional VP-GTAW process, the weld depth and ratio of weld depth to width are improved significantly by the variable polarity frequency in the HPVP-GTAW process, which the ratio of weld depth to width is improved by 36% at equal variable polarity frequency of 100 Hz, and improved by 55% with that of 200 Hz. Weld microstructure and microhardness distribution are changed obviously with the increase of variable polarity frequency. In the conventional VP-GTA W process, the grains in weld central zone are coarser, and the microhardness in weld central zone and fusion zone is about 95 HV and the lowest 82 HV, respectively. The microhardness is enhanced to a certain extent both in the weld central zone and fusion zone with the variation of variable polarity frequency in the HPVP-GTAW process due to the refinement and uniformity of weld microstructure. With the variable polarity frequency of 600 Hz, the microhardness in weld central zone and fusion zone reaches nearly 110 HV and 97 HV, respectively.

关键词： high strength aluminum alloy variable polarity frequency gas tungsten arc welding weld bead geometry