Tungsten electrodes used in TIG welding, which is in the tungsten matrix mixed with 0.3% to 5% by the method of powder metallurgy of rare earth elements such as cerium, thorium, lanthanum, zirconium and yttrium and tungsten alloy bars, after pressure and diameter from 0.25 to 6.4 mm, standard length from 75 to 600, and the most commonly used specifications for the diameter of 1.0, 1.6, 2.4 and 3.2.

To the electrode shape is an important factor for TIG, when using DCSP, tip need to be ground into sharp shape, and its cutting-edge Angle with the range of application, electrode diameter, and the welding current to change, the tip of the narrow joint need a smaller Angle, when welding very thin material, with low current, like the smallest needle electrode, to stabilize the arc, and the proper grounding electrode to ensure easy arc starting, good arc stability and proper weld width.

When welding with AC power supply, there is no need to grind the electric extremes, because the use of appropriate welding current, the electric extremes will form half of the ball, if increase the welding current, the electric extremes will become bulb shape and may melt and pollute the molten gold.