The tungsten electrode is used for TIG welding. This is a tungsten alloy bar made by mixing 0.3%-5% rare earth elements such as cerium, thorium, lanthanum, zirconium, yttrium, etc. in a tungsten matrix through powder metallurgy. The diameter is from 0.25 to 6.4mm, and the standard length is from 75 to 600. The most commonly used specifications are diameters of 1.0, 1.6, 2.4 and 3.2. The shape of the electrode tip is an important factor for TIG. When using DCSP, the electrode end needs to be ground into a sharp shape, and its tip angle varies with the application range, electrode diameter, and welding current. Narrow joints require a smaller tip angle. When welding very thin materials, A low current, needle-like smallest electrode is used to stabilize the arc, and a proper ground electrode can ensure easy arc ignition, good arc stability and proper bead width. When welding with AC power supply, there is no need to grind the electrode end, because when the proper welding current is used, the electrode end will form a hemispherical shape. If the welding current is increased, the electrode end will become bulb-shaped and may melt and contaminate the molten gold.