Recent Advances of Arc Welding Power Sources.

H2/H∞ Robust Controller of the Arc Welding Inverter Power

There are a lot of interference sources in the system of the arc welding inverter power. In this paper, a small-signal model which was built by the method of statespace average was quoted. A control system which comprised an interference of load resistance and an interference of power supply fluctuation was built. A H2/H∞ state -feedback controller was designed in the method of LMI. The simulat...

Gas tungsten arc welding

Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a nonconsumable tungsten electrode to produce the weld. The weld area is protected from atmospheric contamination by a shielding gas (usually an inert gas such as argon), and a filler metal is normally used, though some welds, known as autogenous welds, do not require it. A const...

Hybrid Laser-Arc Welding

Arc Welding Automation

It is very well known that the use of robotics in the industry increases productivity and quality in many aspects. It is also well known that some adjustments have to be made to grant payback for the investment and to reach the expected results. Today, the robotization is known as an alternate technique for production, increasing qualitative and quantitative competence of its industries. One po...

Recent Advances in Polarized Electron Sources*

Current experimental physics programs at a number of electron accelerator laboratories worldwide require the delivery of high average current highly polarized electron beams for long periods of time. The polarized electrons are produced by near bandgap photoemission from certain semiconductor photocathodes. We observe the quantum efficiency of these cathodes to be inversely related to the total...