Abstract: In AA6101 T6 aluminium alloy, the weld fusion zones typically exhibit coarse columnar grains because of the prevailing thermal conditions during weld metal solidification. This often causes inferior weld mechanical properties and poor resistance to hot cracking. But when Gas Metal Arc Welding(GMAW) process under oscillatory condition is used then enhancement in mechanical properties noticed. Total cooling rate increases due to weld pool oscillation. Stirring of the weld pool increases the effective value of the thermal conductivity of the liquid pool because heat transfer in the weld pool becomes more effective. This helps nuclei in the weld pool survive and hence promote the formation of equiaxed fine grains in the fusion zone. In the present work, tensile properties, micro hardness, microstructure of the GMAW joints have been evaluated, and the results are compared with oscillated GMAW joints. It is found that GMAW joints under oscillatory condition ( optimum at amplitude 5 micro met

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-031-6-140
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Abstract: In milling process, and when machining sculptured surfaces cutting forces are variables. Due to the continuous curvature variations of these surfaces abrupt variations in cutting forces are engender. The aim of this research work is to predict the milling forces along tool path during finishing of sculptured surfaces with flat end mills on 3-axis CNC milling machines, using a predictive mechanistic model of cutting forces and a geometric workpiece modeled with Dexels. The main steps of the proposed approach are: 1) approximation of the workpiece by Dexels, 2) milling simulation that consists to simulate the removal material between tools and workpiece by localization the contact regions and 3) cutting forces prediction.

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-031-6-141
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