Welding time and joint preparation are among the most important factors dominating the cost and productivity of welding. If the desired penetration of the weld pool can be achieved in a single pass, the welding speed will be the major factor that determines the welding time. When the thickness of the part increases, grooves may have to be machined so that the desired penetration may still be ob...

FSW is a solid phase welding, invented by W. Thomas and his colleagues at The Welding Institute (TWI), UK, in 1991. It is proven that FSW is completely user friendly, non hazardous and produces no effluents. From the advent of the modern Welding technology, most of all the techniques that were developed produced fumes and gases that were hazardous to the welders and the environment. Protective ...

The surface tension of detached liquid drops in pulsed gas metal arc welding was determined in situ from the period of the prolate–oblate oscillations initiated by the detachment event. The oscillating drops were imaged by an optical shadowgraph technique utilizing laser illumination. Images obtained during the welding process were recorded with a high-speed video camera and stored for subseque...

This paper presents a control system for manual pulsed Gas Metal Arc Welding (GMAW). This system consists of a current controller, which makes it possible to shape the current during welding, and two important components, which are the key issues discussed in this paper. These components include an arc length controller and a metal transfer controller. The arc length controller is based on a no...

Double-Electrode Gas Metal Arc Welding, referred to as DE-GMAW, is a novel process which decouples the melting current into base metal current and bypass current by adding a bypass torch to a conventional GMAW system to establish a bypass arc. This makes it possible to increase the melting current while the base metal current still be controlled at a desired level. Experiments have been done to...

Welding fume contains elements that, in their pure forms, can be hazardous to worker health if inhaled or ingested. Therefore, the chemical composition of welding fume must be examined when considering fume toxicity. Various chemical analysis techniques are presented and their applicability to airborne particles is described. Knowledge of particle size is important because a given characterizat...

An ultrasonic welding system typically consists of four components: power supply, PZT converter, booster and horn. Among them, PZT converter converts electrical power into mechanical power. To improve the power delivery, the input electrical impedance of converter should be reduced. In the present study, influences of piezoelectric ring thickness and thickness of matching and backing layers on ...

In this study, a new Phase Shifted Full Bridge (PSFB) Pulse Width Modulated (PWM) isolated dc-dc converter is proposed. In the proposed converter, resonant inductor is replaced with Linear Variable Inductor (LVI) that is controlled by output current. The soft switching operation range is increased and the dependency of ZVS operation on the load current is decreased. The required energy for ZVS ...

This paper presents a novel control technique on four leg inverter with which the distribution grid is interconnected with the domestic houses. Most of the houses in the distribution side possess inverter for the usage of Electricity. With the advancement in Solar & wind, it will become easy to see houses, often with solar & a small Wind power system. The excess power generated can be exchanged...