can you name a few ores in which that substance occurs?
Wolframite and scheelite
Tungsten
 Its important ores include wolframite and scheelite.

what is gas tungsten arc welding? It is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. is there a gas used in this welding process? Yes, shielding gas what specific gas is used? Helium why are such gases used in this process? To protect the welding area from atmospheric gases. what are some of the applications of this process? Its used in welding thin workpieces, manufacture of space vehicles, bicycle industry, etc. what is that electrode which is used in this process made up of? Tungsten what is the melting point of this substance? UNANSWERABLE can you name a few alloys from the substance mentioned above? High speed steel and quenched (martensitic) tungsten steel. which country holds the largest producer of that substance? China
wiki:19589522
Tungsten [SEP] Introduction
It also has the highest boiling point, at . Its density is 19.25 times that of water, comparable with that of uranium and gold, and much higher (about 1.7 times) than that of lead. Polycrystalline tungsten is an intrinsically brittle and hard material (under standard conditions, when uncombined), making it difficult to work. However, pure single-crystalline tungsten is more ductile and can be cut with a hard-steel hacksaw. Tungsten's many alloys have numerous applications, including incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in gas tungsten arc welding, superalloys, and radiation shielding. Tungsten's hardness and high density give it military applications in penetrating projectiles.