APPARATUS FOR CONTROLLING ARC VOLTAGE OF AUTOMATIC ARC WELDING MACHINE

摘要

PURPOSE: An apparatus for controlling arc voltage of an automatic arc welding machine is provided to obtain furthermore improved welding quality by controlling the position of the torch according to comparison results with the already set standard voltage after removing noise components through a high frequency filter by directly detecting welding voltage impressed to a torch. CONSTITUTION: In an automatic arc welding machine in which a control part(40) adjusts the position of a torch according to comparison results of a standard voltage set as welding conditions and a welding voltage detected through a welding voltage detecting part(30) during welding operation, thereby equally maintaining an arc length, the apparatus is characterized in that the welding voltage detecting part(30) comprises a voltage detecting circuit(31) directly detecting a welding voltage of the torch after starting of welding; a high frequency filter(32) removing noise components from the detected welding voltage values; and an amplifier(33) outputting the amplified welding voltage values to the control part(40) by amplifying welding voltage values filtered through the high frequency filter(32), wherein the control part(40) comprises a memory(41) storing welding conditions of a member by database; a microprocessor(42) changing and setting the welding conditions according to a welding voltage detected by the welding voltage detecting part(30); and a comparator outputting control signals to the torch driving part by comparing the detected welding voltage with a standard voltage set to the welding conditions.