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- W2230655595 abstract "Over the years Gas Metal Arc Welding (GMAW) has widely replaced other welding processes, such as Manual Metal Arc Welding (MMAW). Anyhow, some drawbacks still exist, e.g. high draught sensitivity, which limits its functionality. This study was concerned mainly to this drawback; to establish the effects of a variety of draughts velocities on the weld with a combination of different flows of shielding gas. All other welding parameters, were evaluated and chosen but kept constant throughout all the experiment. The welding quality was evaluated using standardized and non-standardized methods. As for simulating different draught velocities on the weld, a draught simulation apparatus using an air compression system was design and fabricated using a mathematical approach, so that a controlled and laminar flow of air is projected on the whole length of the welds. It was found that that dissipation of the shielding gas and contamination of the weldment occurred at draught velocities as low as 0.9 m/s. Porosity was the main weld discontinuity generated due to the displacement of the shielding gas from the weld pool which had direct relationship with the draught velocity. Despite an increase in the flow of the shielding gas, no porosity or other weld discontinuities were observed at the surface or section of the weldments, when there was no draught displacement on the welds. On the other hand, up till a flow of shielding gas of 30 l/min, it was found that there is a correlation on the structural strength and integrity of the weld between the draught velocity and the flow of the shielding gas." @default.
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- W2230655595 date "2013-01-01" @default.
- W2230655595 modified "2023-09-24" @default.
- W2230655595 title "Understanding the shielding gas dynamics and improving the weld quality in MIG/MAG welding with respect to draughts" @default.
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