Izvorni znanstveni članak
Effects of rotational velocity on microstructures and mechanical properties of surface compensation friction stir welded 6005A-T6 aluminum alloy
Xiangchen Meng
; Shenyang Aerospace University
Shuangsheng Gao
Lin Ma
Zhengwei Li
Yumei Yue
Hanlin Xiao
Sažetak
Surface compensation friction stir welding
(SCFSW) is successfully applied to weld 6005A-T6
aluminum alloy in order to eliminate
disadvantages caused by flash and arc
corrugation. The effects of rotational velocity on
the microstructures and mechanical properties of
SCFSW joints are investigated. The joints with
equal thickness with respect to the workpiece to be
welded are obtained using 4 mm thick plates with
a convex platform in this study. The results show
that welding process parameters exert a significant
influence on the microstructures of nugget zone
(NZ). Tensile strength and elongation of joints are
both firstly increased and then decreased with an
increase in the rotational velocity from 800 rpm to
1500 rpm under a constant welding speed of 200
mm/min. When the rotational velocity is 1300 rpm,
the tensile strength and elongation reach the
maximum values of 226 MPa and 6.5%, which are
75% and 67% of base metal (BM), respectively.
The fracture surface morphology represents the
typical ductile fracture. The hardness of NZ is
lower than that of BM and the lowest hardness of
joint is located at thermo-mechanically affected
zone (TMAZ) on the advancing side (AS).
Ključne riječi
surface compensation friction stir welding; 6005A-T6 aluminum alloy; convex platform; mechanical property; ductile fracture
Hrčak ID:
155312
URI
Datum izdavanja:
8.4.2016.
Posjeta: 928 *