A skilled welder determines the weld joint penetration from his/her observation of the weld pool surface during the welding process. This paper addresses the characterization of the 3D weld pool surface in gas tungsten arc welding (GTAW), i.e., extracting a set of characteristic parameters from the 3D weld pool surface to determine the backside bead width that measures the degree of weld joint ...

Al-Si is the most popular coating used to prevent oxidation on surfaces of hot-stamped steel sheets during heating process. However, like other coatings, it affects strength spot welds in joining parts. In this study, effects tensile resistance spot-welded joints are discussed. Two types 1.8 mm steel, uncoated and coated forms, were spot-welded, shear behavior welded was studied both static dyn...

There were more intergranular precipitates and intragranular NbC in the interdendrites for heat treatment one after 615 °C/48h than that of as-weld, increased resulted emergence cracks grain boundary sample, which only worked local region during failure materials. The lattice distortion reduced from by treatment. As a result, fractography was classified as brittle transgranular fracture played ...

Sharma, Saurabh Weld for Itanium Processor (Under the direction of Dr. Thomas M. Conte) This dissertation extends a WELD for Itanium processors. Emre Özer presented WELD architecture in his Ph.D. thesis. WELD integrates multithreading support into an Itanium processor to hide run-time latency effects that cannot be determined by the compiler. Also, it proposes a hardware technique called operat...

Welding input parameters play a very significant role in determining the quality of a weld joint. The joint quality can be defined in terms of properties such as weld-bead geometry, mechanical properties, and distortion. Generally, all welding processes are used with the aim of obtaining a welded joint with the desired weld-bead parameters, excellent mechanical properties with minimum distortio...

A three-dimensional mathematical model and numerical techniques were developed for simulating a moving gas metal arc welding process. The model is used to calculate the transient distributions of temperature and velocity in the weld pool and the dynamic shape of the weld pool for aluminum alloy 6005-T4. Corresponding experiments were conducted and in good agreement with modeling predictions. Th...

In this research, copper (Cu) donor material-assisted friction stir welding (FSW) of AA6061-T6 alloy was studied. Cu-assisted FSW joints were prepared at a constant tool rotational rate 1400 rpm and various speeds 1 mm/s 3 mm/s. The Cu material different thickness (i.e., 20%, 40%, 60%) with respect to the workpiece selected assist joining plunge stage. It is observed that downward force generat...