Rectifying Action of Electric Arcs Formed on Welding Electrodes

Investigations on Instabilities of Electric Arcs

A general formalism is derived, that allows the evaluation of magnetic instabilities of all types of electric arc. It is shown that a stability criterion exists which is determined by the interaction between the magnetic forces, the frictional force and the so-called isotherm movement. This criterion can be expressed in terms of a dimensionless parameter Mk: when Mk is smaller than a critical v...

Measurement of ultraviolet radiation from welding arcs.

It is well khown that welding arcs emit intense ultraviolet radiation and those who conduct welding operations or work nearby are exposed to the radiation and often suffer injuries. It is desirable to evaluate the ultraviolet radiation from the viewpoint of industrial health. But, there have been few quantitative studies of this radiation. We determined the ultraviolet effective irradiance, bas...

Retinal burns from MIG-welding arcs.

SIR, I read the article by G P H Brittain' on retinal burns caused by exposure to MIG-welding arcs with great interest. I had not seen any cases in Australia and so I was very interested to study the illustrations. Two cases were described. The first case was illustrated in Fig. 2 but I could not see the 'small dark lesion above each fovea' said to be present. The second case is illustrated in ...

Memristive fingerprints of electric arcs

We discuss the memristive fingerprints of the hybrid Cassie-Mayr model of electric arcs. In particular, it is shown that (i) the voltage-current characteristic of the model has the pinched hysteresis nature, (ii) the voltage and current zero crossings occur at the same instants, and (iii) when the frequency f of the power supply increases, the voltage-current pinched hysteresis characteristic t...

THE INFLUENCE OF GAS STW6 AND MAGNETIC FIELDS ON ELECTRIC DISWARGES PART 4. ARCS MOVmG ALONG STRAIGHT PAPALLEL ELECTRODES Qr