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Welding Overview
- Dec 21, 2016 -

Arc welding is the most widely used method of welding. It includes: manual metal arc welding, submerged arc welding, gas tungsten arc welding, plasma arc welding, gas metal arc welding, etc.

(1) manual arc welding

Manual arc welding arc welding are a variety of methods development, is still the most widely used method of welding. It is externally coated with coatings as electrode and filler metal of electrode, the arc is between the electrode tip and the surface of the work piece burns. Coating in arc under heat can produce gases with arc, on the other hand can produce slag over the weld pool surface to prevent molten metal interaction with the surrounding gas. More important role of slag with the physical reaction of molten metal or alloy elements, improve the performance of weld metal.

(2) for submerged arc welding

Is a continuous feed of submerged arc welding wire electrodes and filler metals. When welding in the welding area is covered with a layer of granular flux, arc Burns under the burden, the wire ends and some local base metal melting, forming the weld.

(3) gas shielded tungsten arc welding

This is not a gas metal arc welding, using tungsten arc between the workpiece and melt the metal and form the weld. Welding of tungsten electrode does not melt, electrode effect. While the welding torch nozzle into argon or helium for protection. Metal can be added as needed. Internationally known as TIG welding.

(4) plasma arc welding

Plasma arc welding is not a consumable electrode arc welding. It uses compressed arc between the electrode and the work piece (call forwarding transfer ARC) welding. The tungsten electrode is usually used. Plasma arc plasma gas argon, nitrogen, helium or a mixture of both. Also through the nozzle by the inert gas protection. Can be applied when welding filler metal and add filler metal may or may not.