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In this research, the effect of filler weld material on the mechanical properties of tungsten inert gas (TIG) welded AA6061 alloy weldments have been investigated. The microstructure of the base metal (BM) as well as weld metal (WM) and heat affected zone (HAZ) was analyzed using optical microscopy and scanning electron microscopy (SEM), and the Vickers hardness of the samples were compared. Corrosion resistance of the weld area was investigated in natural seawater solution. Results for both filler samples indicate that the strength of the WMs and HAZs is lower compared to BMs. In addition to that, the weld joints of ER4043 samples show relatively higher hardness compared to ER4047 samples. The corrosion test results show that ER4043 sample has a lower corrosion rate value compared to ER4047. It can be concluded that ER4043 samples show better Vickers hardness value and corrosion resistance compared to ER4047 samples.

The strength of the centrifugal pump is crucial to ensure the safe pump operating when endure to unintended pumping condition. The presence of the solid particles and sudden increase of pressure may lead to the damage on the casing of a centrifugal pump and it becomes critical when the thickness of the casing is thin. This study aims to investigate the effects of the thickness on the mechanical aspects such as stress, strain and displacement in the casing design by using finite element (FE) analysis. The structure of the pump casing with various thicknesses is analyzed via FE-based software. The correlation of the wall thickness with the mechanical aspects is studied. The critical region with high stress was spotted in the simulation. The simulation results revealed the wall thickness demonstrated a polynomial correlation to the displacement and strain. The stress of the casing showed the linear correlation with the thickness. The critical region was noticed at the intersection region of the pump casing. The mechanical aspects of the pump casing were improved with the increment of the wall thickness in the pump casing design.

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