From Tungsten Electrodes to Arc Stability Impact Factor – Workpiece Surface State

GTAW（Gas Tungsten Arc Welding） arc stability test under high pressure showed that there are many factors can affect the arc stability, such as, the surface state of workpiece, tungsten electrodes, a shielding gas effect and other factors. This article describes that workpiece surface state impact on the arc stability.

Workpiece surface state would influence the stability of the arc. GTAW welding method is particularly sensitive to the oil and oxide films on workpiece / wire surface, if there is the presence of the oil or oxide films, the arc is not capable of ignition or stable combustion. So, before welding, the wire surface and the part near the joint weldment must be cleaned to remove the grease, moisture, dirt and other debris oxide film on metal surfaces and to ensure that arc strike stably and bur steadily. Cleanup methods can be divided into the following kinds; you can select one according to the materials.

(1) Chemical cleaning. This method is commonly used to cleanup weld wire, whose effect is good and production efficiency is high. For different metal materials, chemical cleaning agents and process procedures they been used are different, so it should be cleaned according to instructions.

(2) Mechanical cleaning. This method is simple and the results are good.

(3) Chemical - Mechanical cleaning, if it is a large workpiece, it needs twice cleaning. 



 

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