›› 2012, Vol. ›› Issue (03): 651-655.

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Effect of Cr2O3 fluxes on the microstructures and penetration of twin wire MIG welded joint

RUAN Ye1,2, QIU Xiao-ming1, GONG Wen-biao3, WANG Yi1, SUN Da-qian1   

  1. 1. School of Materials Science and Engineering, Jilin University, Changchun 130022, China;
    2. Industrial Department, Changchun Railway Vehicles CO., Ltd., Changchun 130062, China;
    3. School of Materials Science and Engineering, Changchun University of Technology, Changchun 130041, China
  • Received:2011-07-16 Online:2012-05-01

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Abstract: The microstructures, penetration and mechanism of the welding joint by twin wire Metal Inert Gas (MIG) welding with Cr2O3 activating flux were studied by using SEM, XRD and optical microscopy. Results show that, in Hot Affect Zone (HAZ), the grain size with the flux is bigger than that without the flux. The grain size increases with the flux but the growth rate gradually slows down. The penetration depth into the welding joint increases sharply with the flux first then slows down to a stable state. More welding heat input and less Mg2Si content are the main reasons leading to the growth of grain size. The phase compositions of the joint with flux do not change compared to the joint without flux, which are still α-Al and Mg2Si. The arc constriction and higher arc temperature are the main factors for the deeper penetration into the welding joint.

Key words: metallic material, 6082-T6 Al-alloy, twin wire metal inert gas welding(MIG), microstructure of joint, penetration, activating flux

CLC Number: 

  • TG406
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