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Study on Laser welding of Al Composite

Journal of Materials Science & technology 2001年第1期17卷 173-174页

作者： Jitai NIU Zhonghong LAI MuZhen WANG liming liu and lin wu national key laboratory of advanced welding production technology, harbin institute of technology, harbin 150001, china harbin Inst. of Technol. Harbin 150001 China

The effects of laser welding parameter on strength of welded joints were studied. The mechanism for loss of joint strength was analyzed. It was pointed out that an important factor affecting joint strength is the reaction between matrix and reinforced phase. On the basis of this, the concept of critical St activity a[si]min was proposed. Using appropriate welding parameters and Si activity, high quality laser welded joints in an aluminum matrix composite SiCw/6061Al can be Successfully obtained.

关键词： joint strength welded joints aluminum matrix composite welding parameters strength of

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Research on the Mechanism of Penetration Increase by Fluxin A-Tig welding

Research on the Mechanism of Penetration Increase by Fluxin ...

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The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Chunli YANG, Sanbao lin, Fengyao liu, lin wu and Qingtao ZHANG State key Lab. of advanced welding production technology, harbin institute of technology, harbin 150001, china

The mechanism of penetration depth increased by activating flux in Activating Tungsten Inert Gas (A-TIG) welding was studied by measuring the distribution of trace element Bi in the weld and monitoring the change of arc voltage during A-TIG welding of stainless steel 0Cr18Ni9 with fluxes SiO2 and TiO2. The results show that the mechanism of penetration depth increase in A-TIG welding depends on the sort of flux used. The weld pool convection after coating the flux SiO2 and flux TiO2 is changed inversely compared with convectional TIG welding without flux. The arc voltage is increased by flux SiO2 whilst flux TiO2 does not have effect on the arc voltage. The reason of penetration depth increase for SiO2 is due to the constriction of arc plasma and the change of surface tension gradient. The increase of weld penetration depth with TiO2 only ascribes to the change of surface tension gradient.

关键词： TIG welding Activating flux Surface tension Arc voltage

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Research on the Mechanism of Penetration Increase by Flux in A-TIG welding

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Journal of Materials Science & technology 2003年第z1期19卷 225-227页

作者： Chunli YANG Sanbao lin Fengyao liu lin wu Qingtao ZHANG State key Lab.of advanced welding production technology Harbin Institute of TechnologyHarbin 150001China

The mechanism of penetration depth increased by activating flux in activating tungsten inert gas(A-TIG)weldingwas studied by measuring the distribution of trace element Bi in the weld and monitoring the change of arc voltageduring A-TIG welding of stainless steel 0Crl8Ni9 with fluxes SiO_(2)and TiO_(2).The results show that the mechanismof penetration depth in A-TIG welding depends on the sort of flux *** weld pool convection after coating theflux SiO_(2)and flux TiO_(2)is changed inversely compared with convectional TIG welding without *** arc voltageis increased by flux SiO_(2)whilst flux TiO_(2)does not have effect on the arc *** reason of penetration depthincrease for SiO_(2)is due to the constriction of arc plasma and the change of surface tension *** increaseof weld penetration depth with TiO_(2)only ascribes to the change of surface tension gradient.

关键词： TIG welding Activating flux Surface tension Arc voltage

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Feature-based Design of Welded Structure for Robotic Arc welding Off-line Programming

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Journal of Materials Science & technology 2001年第1期17卷 181-182页

作者： Tong liu Jinsong TIAN lin wu Ming DAI national key Lab of advanced welding production technology Harbin institute of TechnologyHarbin 150001China

Feature modeler of welded structure provides both 3D-geographical and non-geographical features for the off-line programming of arc welded robot. Welded structure is regarded as an assembly, the design of welded structure consists of three aspects f plane, joint, and groove design. Each aspect corresponds to a category of features. The plane features are defined by interactive feature definition. A method analogous to the 'mating feature' is introduced to represent the joint features. Based on AutoCAD 2000, a B-rep solid modeler, a prototype system is implemented.

关键词： Robotic Arc welding welded structure prototype system

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