The wedge and bulge expansion tests were compared in the assessment of the seam welds strength in a tubular profile extruded at two ram speeds. In the wedge test, the expansion was determined by moving a conical punch into the tube until the specimen fracture. In the bulge test, a hydrostatic tensile stress state was applied by expanding the specimen with an internal rubber plug. The two methodologies were compared in terms of load and hoop strain at fracture and by detecting the fracture morphology and location. Then, the effect of a number of design parameters was investigated in order to evaluate the robustness of the standard testing conditions. For both tests, ductile fractures appeared in the seam welds location, but the bulge test was more robust and conservative with respect to the wedge test, showing less scattered data. Thus, the performances of a second die for the tube profile, designed to optimize the seam welds quality, have been successfully assessed by the bulge test and results compared to those achieved by a novel numerical quality index, coming to a final good matching.

Comparison of experimental methods to evaluate seam welds quality in extruded profiles / Reggiani, Barbara; Donati, Lorenzo. - In: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA. - ISSN 1003-6326. - 30:3(2020), pp. 619-634. [10.1016/S1003-6326(20)65241-4]

Comparison of experimental methods to evaluate seam welds quality in extruded profiles

REGGIANI Barbara;
2020

Abstract

The wedge and bulge expansion tests were compared in the assessment of the seam welds strength in a tubular profile extruded at two ram speeds. In the wedge test, the expansion was determined by moving a conical punch into the tube until the specimen fracture. In the bulge test, a hydrostatic tensile stress state was applied by expanding the specimen with an internal rubber plug. The two methodologies were compared in terms of load and hoop strain at fracture and by detecting the fracture morphology and location. Then, the effect of a number of design parameters was investigated in order to evaluate the robustness of the standard testing conditions. For both tests, ductile fractures appeared in the seam welds location, but the bulge test was more robust and conservative with respect to the wedge test, showing less scattered data. Thus, the performances of a second die for the tube profile, designed to optimize the seam welds quality, have been successfully assessed by the bulge test and results compared to those achieved by a novel numerical quality index, coming to a final good matching.
2020
mar-2020
30
3
619
634
Comparison of experimental methods to evaluate seam welds quality in extruded profiles / Reggiani, Barbara; Donati, Lorenzo. - In: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA. - ISSN 1003-6326. - 30:3(2020), pp. 619-634. [10.1016/S1003-6326(20)65241-4]
Reggiani, Barbara; Donati, Lorenzo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1199676
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