Develop a sustainable welding procedure for chromium manganese austenitic stainless steel using the ATIG process

Chromium manganese austenitic stainless steel is exhibiting an admirable amalgamation of higher strength and stress corrosion resistance. This economical steel is developed to fulfill the requirement of a variety of consumers for high temperature and structural applications. Hitherto, the limitation associate with the TIG welding process is a low depth of penetration which reduces productivity. Activated tungsten inert gas welding (ATIG) is the best suitable option to overcome this problem and satisfy the sustainable welding requirement. Welding procedure has been developed for chromium manganese austenitic stainless steel during ATIG welding using a box behken design (BBD) to improve penetration depth and productivity. The activated flux using SiO2 and TiO2 flux indicates improvement in penetration 5.3 mm and 5.1 mm as compared to TIG welding. The ATIG welded test coupon has strength and hardness of 495 MPa and 195 HV when using SiO2 flux, and 487 MPa and 190 HV when using TiO2 flux, compared to 435 MPa and 165HV for the TIG welded test coupon. ATIG welds have higher strength and hardness because of their finer grain size when compared to TIG welded test coupons.

Digital Control for Fatigue Testing Machine Applied to Additively Manufactured Thermoplastics

A system that outputs force and number of applied force cycles with respect to time was designed to make a fatigue analysis machine. The design of electric circuit and the microcontroller Arduino code was developed and tested. The two subsystems comprise of a load cell for force readings and an electric motor for outputting cyclical forces to a test coupon. The subsystems should minimize error and maximize experimental modulation to validate the output data. The testing data of the subsystems of the fatigue apparatus was presented and analyzed to verify the design.

Digital Control for Fatigue Testing Machine Applied to Additively Manufactured Thermoplastics

A system that outputs force and number of applied force cycles with respect to time was designed to make a fatigue analysis machine. The design of electric circuit and the microcontroller Arduino code was developed and tested. The two subsystems comprise of a load cell for force readings and an electric motor for outputting cyclical forces to a test coupon. The subsystems should minimize error and maximize experimental modulation to validate the output data. The testing data of the subsystems of the fatigue apparatus was presented and analyzed to verify the design.

Investigation of Process Induced Variations in PolyJet Printing With Digital Polypropylene via Homogeneous 3D Tensile Test Coupon

The capability of additive manufacturing (AM) of making the monolithic, multi-material structure allow the fabrication of complex parts with varying mechanical properties. Many AM processes and equipment utilize proprietary material stocks from equipment vendors. A better understanding of the digital material mixing behavior to form traditional material configurations during AM is critical. Many jetting-based AM processes also have the capability to print different material gradient and build them layer by layer in a specific concentration of two or more base materials. This paper investigates the tensile strength and mechanical behavior of these digital materials formed by mixing or multi-material interfaces fabricated by material jetting. Further, due to the flexibility of orientating the digital design in AM, a part can be created in any orientation; however, processing-induced variation affects the performance of parts, as the way AM forms part is different from traditional manufacturing that leads to many artifacts. These artifacts affect the mechanical properties and behavior of final parts formed in AM. To eliminate the process-induced effect that exits in traditional 2D test coupon, this paper evaluates a homogenized 3D configuration test coupon which reduces the geometric effects in AM, that we had recently proposed and investigated.