CHARACTERISTICS OF AA7075-T6 AND AA6061-T6 FRICTION WELDED JOINTS

2015 ◽  
Vol 39 (4) ◽  
pp. 845-854 ◽  
Author(s):  
Sathish Rengarajan ◽  
Vaddi Seshagiri Rao
Keyword(s):  
Experimental Study ◽  
Mechanical Characterization ◽  
Dissimilar Materials ◽  
High Strength ◽  
Structural Behavior ◽  
Direct Drive ◽  
Parent Metal ◽  
Interface Zone ◽  
Eutectic Particles ◽  
Distinctive Difference

In this experimental study dissimilar materials of AA6061-T6 and AA7075-T6 having distinctive difference in physical and thermal properties were welded using continuous direct drive friction welding. High strength was achieved by high friction, upset pressure, low burn off length and medium rotational speed. Mechanical characterization and Micro structural behavior of the joint were given the paramount importance in this experimental analysis. The macro structure indicates that change in the direction of flow of grains perpendicular to the initial grain direction of the parent metal. Also the micro structural analysis at the interface zone showed the presence of eutectic particles that are formed as fragmented agglomerates.

Ultrasonic Torsional Welding of Metal/Glass Ceramics Joints

2019 ◽  
Vol 809 ◽  
pp. 237-244
Author(s):  
Andreas Gester ◽  
Guntram Wagner
Keyword(s):  
Mechanical Characterization ◽  
Glass Ceramics ◽  
Dissimilar Materials ◽  
High Strength ◽  
Tensile Shear ◽  
Shear Tests ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Solid State Joining ◽  
Welding Technique

Ultrasonic welding is a suitable solid-state joining technique for producing high strength joints of similar or dissimilar materials, even of material combinations that were previously considered as not weldable. Several varieties of transmitting the ultrasound into the joining partners exist whereas the investigated torsional welding principle utilizes a ring shaped sonotrode for transmitting ultrasonic vibrations tangentially to the welding force into the workpiece. Due to the specific sonotrode geometry ultrasonic torsional welding is a remarkably gentle welding technique, allowing to join even most sensitive components e.g. sensors or brittle elements. Nevertheless, ultrasonic torsional welded joints show high tensile strengths and helium-tightness. Current investigations focus on the realization of metal/glass ceramics joints. In this project two metals with different thermal expansion coefficients have been utilized as the metal joining partner. The glass joining partner was the commercially available Li2O-Al2O3-SiO2 CERAN. For examining the microstructure light as well as scanning electron microscopy have been performed. Additionally, mechanical characterization has been carried out through tensile shear tests.

scholarly journals Experimental Study and Modeling of the Fatigue Fracture of High-Strength FeMnSi-based Shape Memory Alloy

2020 ◽  
Vol 28 ◽  
pp. 2110-2117
Author(s):  
Fedor S. Belyaev ◽  
Margarita E. Evard ◽  
Eugeny S. Ostropiko ◽  
Aleksandr E. Volkov
Keyword(s):  
Experimental Study ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Fatigue Fracture ◽  
High Strength

scholarly journals Experimental Study on the Torsional Behaviour of Prestressed HSC Hollow Beams

2020 ◽  
Vol 10 (2) ◽  
pp. 642 ◽  
Author(s):  
Luís Bernardo ◽  
Sérgio Lopes ◽  
Mafalda Teixeira
Keyword(s):  
Experimental Study ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Experimental Program ◽  
Pure Torsion ◽  
Strength Concrete ◽  
Hollow Beams

This article describes an experimental program developed to study the influence of longitudinal prestress on the behaviour of high-strength concrete hollow beams under pure torsion. The pre-cracking, the post-cracking and the ultimate behaviour are analysed. Three tests were carried out on large hollow high-strength concrete beams with similar concrete strength. The variable studied was the level of longitudinal uniform prestress. Some important conclusions on different aspects of the beams’ behaviour are presented. These conclusions, considered important for the design of box bridges, include the influence of the level of prestress in the cracking and ultimate behaviour.

Sign in / Sign up

Export Citation Format

Share Document