Direct microjoining using Yttrium-Aluminium-Garnet (YAG) laser beams of copper wire and a plate or substrate board was carried out. The control of the behavior of the molten wire was extremely important to prevent joining defects such as evaporation or constriction of the wire. Both the contact angle between the wire and the plate and the distance from the tip of the wire to the laser irradiati...

Ozone is well established as an important oxidising agent in many industrial applications and the high-voltage pulsed streamer discharge technique has emerged as an efficient method for its production. The paper investigates the parameters that are important in this process, including the magnitude of the applied pulse voltage, the air flow rate and the electrode dimensions and spacing, when us...

Thermal stresses and displacement functions are obtained for a rectangular plate occupying the space R: -a < x a, 0 y b, -h z h, with known boundary initial conditions. In this inverse problem unknown surface temperature is determined on along y-axis when at some internal point known. The governing heat conduction equation has been solved by applying Marchi – Fasulo transform Laplace techniq...

Surface texture of a tool plays an important role as it primarily controls the frictional behavior at the tribo interface. In the present investigation, pin-on-plate sliding tester was used to identify the effect of directionality of surface grinding marks on coefficient of friction and transfer layer formation. 080 M40 steel plates were ground to achieve different surface roughness with unidir...

The defect detection capabilities of transient thermography and shearography have been compared using optimum excitation methods for each technique: short pulse heating for thermography and vibration excitation using a piezoelectric transducer for shearography. A signal-to-noise ratio and limit of detection analysis has been performed on defect images obtained by the two techniques using the di...

Unconstrained metal powders of chromium and nickel, in combination with aluminium, were used the submerged arc welding (SAW) process to simplify weld alloying. refer non-alloyed that are not constrained tubular wire, such as fluxed-cored metal-cored wire. Aluminium powder is control oxygen potential at molten flux–weld pool interface. The results presented here show addition aluminium enhances ...