Studies on weld metal characteristics and their influence on tensile and fatigue properties of pulsed-current GMA welded Al-Zn-Mg alloy

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Welding Journal

OSTI ID:218538

Potluri, N B ^[1]; Ghosh, P K; Gupta, P C; Reddy, Y S ^[2]

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1. Auburn Univ., AL (United States). Materials Engineering Program
2. Univ. of Roorkee (India)

Pulsed-current GMA welding of an extruded section of Al-Zn-Mg alloy (7005) was carried out by using Al-Mg (5183) welding wire. During welding, the pulse parameters, such as pulse frequency and duration, were varied and their effects on the zinc pickup due to dilution of base material, porosity content and microstructure, as well as the hardness, tensile and fatigue properties of the weld metal were studied. The zinc pickup of the weld was correlated to its hardness and both the zinc pickup and porosity content of the weld were correlated to the tensile strength and fatigue life of the weld. The characteristics and mechanical properties of the pulsed-current GMA weld were compared with those of a continuous-current weld. It was observed that the variation in the pulse parameters affects the zinc pickup, porosity content and microstructure of the weld. The increase in zinc pickup enhanced the hardness, tensile strength and fatigue life, whereas, the porosity content was found to reduce the tensile strength and fatigue life of the weld. The pulsed-current GMA welding was found to improve the weld properties over those of continuous-current GMA welds.

• OSTI ID: 218538
• Journal Information: Welding Journal, Journal Name: Welding Journal Journal Issue: 2 Vol. 75; ISSN 0043-2296; ISSN WEJUA3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
EXPERIMENTAL DATA
FILLER METALS
GAS METAL-ARC WELDING
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
WEIGHT
WELDED JOINTS
ZINC ALLOYS