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Grain refining can improve the mechanical properties and solidification-cracking resistance of the weld. Ultrasonic grain refining was conducted by dipping an ultrasonic probe in the weld pool to stir it at a distance behind the arc. This new approach produced effective grain refining in arc welds of Mg alloys AZ31 Mg and AZ91 Mg. Grain refining increased when the probe was positioned farther behind...
The use of Mg alloys for vehicle weight reduction has increased significantly recently. Because the potential of metal inert gas (MIG) welding as a versatile process for mass producing Mg welds has increased dramatically recently, the need for better understanding the weldability of Mg alloys in MIG welding also increases. Although the susceptibility of Mg alloys in MIG welding to cracking along the...
The valid method study for welding quality monitor has become a serious problem. It is difficult to use single sensor to identify the quality of actual nugget because of the affected factors in the welding process. A spot welding quality monitor system based on the sensors array technique is developed. A modified signal processing algorithm based on Fast ICA is proposed to extract the objected signals...
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