The increasing attention to magnesium alloys in extruded profiles, especially in the transportation industry, is related to their low density associated with good mechanical properties and complete recyclability. This allows to push towards both increasing efficiency and pollution restrictions. However, these advantages are negatively balanced by the production rates drop in relation to dangerous profile temperatures increasing that force to keep low velocities. In this context, a novel porthole die has been purposely designed for magnesium alloys allowing an increasing of the process velocity up to four times with respect to past solutions. The mandrel consisted of three ports made by 120° bridges that created an equal number of seam welds. The extruded tubes, made in ZM21, were 50 mm in diameter and 2 mm in thickness and were tested under different process conditions. In the present work, the quality of the seam welds has been investigated in relation to each process condition by means of the rubber plug testing method that allowed to apply an hydrostatic tensile state.
Effect of process parameters on seam weld quality of ZM21 tubes / A. Segatori; B. Reggiani; L. Donati; T. Pinter; Y. Rami; L. Tomesani. - STAMPA. - 504-506:(2012), pp. 487-492. (Intervento presentato al convegno 15th Conference of the European Scientific Association on Material Forming, ESAFORM 2012 tenutosi a Erlangen, Germany nel 14-16 March 2012) [10.4028/www.scientific.net/KEM.504-506.487].
Effect of process parameters on seam weld quality of ZM21 tubes
SEGATORI, ANTONIO;REGGIANI, BARBARA;DONATI, LORENZO;TOMESANI, LUCA
2012
Abstract
The increasing attention to magnesium alloys in extruded profiles, especially in the transportation industry, is related to their low density associated with good mechanical properties and complete recyclability. This allows to push towards both increasing efficiency and pollution restrictions. However, these advantages are negatively balanced by the production rates drop in relation to dangerous profile temperatures increasing that force to keep low velocities. In this context, a novel porthole die has been purposely designed for magnesium alloys allowing an increasing of the process velocity up to four times with respect to past solutions. The mandrel consisted of three ports made by 120° bridges that created an equal number of seam welds. The extruded tubes, made in ZM21, were 50 mm in diameter and 2 mm in thickness and were tested under different process conditions. In the present work, the quality of the seam welds has been investigated in relation to each process condition by means of the rubber plug testing method that allowed to apply an hydrostatic tensile state.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
