Welding apparatus of the tungsten inert gas (t.i.g.) type with digital control of the welding cycle.

摘要

An apparatus for welding with digital control is described wherein the welding current is controlled by an analog programmer (14) which commands the evolution of the current as per the program, which is to be laid down as required. The weld current is controlled by a counterreaction ring (11) circuit effective for detecting the impedances of line and for automatically compensating the fluctuations of impedance of the arc. The electric efficiency is optimized by using a generator which is provided with an automatic control of the voltage across the current regulator (3), for the purpose of maintaining the voltage within the limits of safety. When the voltage exceeds one of the two thresholds, minimum or maximum, the regulation system provides to restore said voltage within said limits through the insertion and disinsertion of the feeding transformers.