Tungsten,a metal element, atomic number 74, atomic weight 183.85.Steel gray or silvery-white, high hardness, high melting point, room temperature without air attack; mainly used for the manufacture of the filament and high-speed cutting steel, hard mold, also used in optical instruments, chemistry instruments. China is the world's largest tungsten storage power.
 
Tungsten is part of non-ferrous metals, is also an important strategic metal, tungsten ore in ancient times was called "heavy stone." 1781 by the Swedish chemist Carl Wilhelm Scheele discovered scheelite, and extract new elements acid - acid, in 1783 by the Spanish Air Asia Depp found wolframite also extract the acid, the same year, with carbon reduction of tungsten trioxide first got tungsten powder, and named the element. Tungsten content in the crust is 0.001%. Tungsten minerals have been found in 20 species. Tungsten deposit is generally accompanied by granitic magma activity and the formation. After tungsten smelting after the silver-white lustrous metal, high melting point, great hardness. Tungsten is the highest melting points.

Land and Resources has announced the list of the second batch of 33 mines eligibility for National Mine Park, Chenzhou Mining Shizhuyuan Park and Guiyang Baoshan Mine Park list.

Mine Park is a showcase of human remains of the landscape as the main mining, mining development reflects historical connotations, have research value and educational function, available tour to visit, conduct scientific investigation and scientific literacy of specific spatial zone.
 
China has 61 national parks Mine Park qualification. The unit was awarded the qualification requirements shall be carried out by the Ministry of Land and construction in the park during the two years of construction, the building standards be officially named National Mine Park.

The most high-temperature aluminum heat-400g tungsten oxide thermite video.

The First Step: An elongated strip through the mold pipe
 
The Two Step : Wegmentation, typically 60mm or 400mm length
 
The Third step: Clear, drying, filling, sealing
 
The Fourth step: Testing, packaging, storage
 
Note: 1, The matrix preheat; 2, Flame size; 3, Welding distance; 4, Electrode angle.
In the process of welding strict compliance: oxygen and acetylene bottles can not be put together in order to prevent dangerous!