High strength steels Q690+Q550 were welded using three different welding wires without preheating by gas shielded arc welding process. Microstructural characteristics of weld metals and nucleation mechanism of acicular ferrite were investigated by means of scanning electron microscope (SEM), energy dispersive spectrum (EDS) and transmission electron microscope (TEM). The straight Y-groove test ...

Abstract During the process of regeneration machine parts, certain phenomena occur that have a significant impact on loss their working ability. Hereditary properties are expressed by interdependence geometric and physical-mechanical-metallurgical parameters gear teeth created during technological operations worn hard-facing. The influence type additional material (electrodes combinations) trib...

Subharmonic images are becoming interestingly in medical ultrasound, as the improvement of contrastto-tissue ratio (CTR). However, an important part for image enhancement is processing techniques. In this study, frequency response functions (FRFs) of multiple-input-multiple-output (MIMO) Volterra systems were used to investigate potentially possible in separating subharmonic frequency for the q...

The objective of this research is to develop an experimental-theoretical analysis about the influence of the cooling medium and the geometry of the welding bead profile in fatigue life and the associated parameters with structural integrity of welded joints. A welded joint with cruciform geometry is considered using SMAW (Shielded Metal ArcWelding), plates in structural steel ASTM A36 HR of 8 m...

This paper presents the result of using a spatial matrix identification method to estimate the rigid body properties of a frame structure. Frequency response functions in three directions at 10 points of the structure are measured by hammer testing. The boundary condition of the structure is free-free. Using the single-input-multiple-output FRFs, the identification method can estimate the rigid...

Gas metal arc welding has been generally accepted as the preferred joining technique due to its advantages in high production and automated welding applications. Separate control of arc energy and arc force is an essential way to improve the welding quality and to obtain the projected metal transfer mode. One of the most eVective methods for obtaining separate control is to exert an additional ...