Shape and surface quality dimensions of tungsten electrode
The surface of tungsten electrode materials need to be cleaned, polished or burnished after drawing or forging processing. The tungsten electrode surface quality with low roughness after grinding can ensure that the contact area between the electrode welding tungsten and chuck is the biggest, which can obtain the largest current carrying capacity. If we adopt the chemical cleaning, the tungsten electrode surface is rougher, and the contact resistance will reduce the current carrying capacity.
For the electrodes with scar, crack, shrinkage, burr or non metallic inclusions and other defects shouldn't be used, because these defects will affect its current carrying capacity. The sags and crests of electrode surface will cause the arc column "tempering" phenomenon. The diameter range of tungsten electrode is about 0.5-6.4mm. The length is unlimited. The correct use of tungsten electrode can obtain more stable arc, and can prolong the service life of the tungsten electrode. After the tungsten is selected, the shape and the size are two important factors that affect the welding quality and the phone.
If the surface of tungsten electrode end is uneven, the phone will be unfocused and unstable, so before using, the end needs to have a conical grinding. Sharpening degree shall be determined according to the wire diameter and the use size of current. For example, when we welded the thin plate and used small current, we can firstly use the small diameter tungsten electrode with grinding tip end, (about 20-40 degrees, but should not be less than 15 degrees), in this case, it is so easy to start the arc and stable electrodes arc. However, if the current is larger, the end will superheat melt because of the larger current density, and then the burning damage will be increased. At the same time, the telephone spots will be expanded to cone tungsten electrode terminal, so that the arc column floating diffusion or indefinite. Therefore, the cone angle needs to be increased appropriately or adopt the flat topped cone tungsten.
For the electrodes with scar, crack, shrinkage, burr or non metallic inclusions and other defects shouldn't be used, because these defects will affect its current carrying capacity. The sags and crests of electrode surface will cause the arc column "tempering" phenomenon. The diameter range of tungsten electrode is about 0.5-6.4mm. The length is unlimited. The correct use of tungsten electrode can obtain more stable arc, and can prolong the service life of the tungsten electrode. After the tungsten is selected, the shape and the size are two important factors that affect the welding quality and the phone.
If the surface of tungsten electrode end is uneven, the phone will be unfocused and unstable, so before using, the end needs to have a conical grinding. Sharpening degree shall be determined according to the wire diameter and the use size of current. For example, when we welded the thin plate and used small current, we can firstly use the small diameter tungsten electrode with grinding tip end, (about 20-40 degrees, but should not be less than 15 degrees), in this case, it is so easy to start the arc and stable electrodes arc. However, if the current is larger, the end will superheat melt because of the larger current density, and then the burning damage will be increased. At the same time, the telephone spots will be expanded to cone tungsten electrode terminal, so that the arc column floating diffusion or indefinite. Therefore, the cone angle needs to be increased appropriately or adopt the flat topped cone tungsten.
