Always very sharp tungsten needle,

When the switch must be very short, frequent,
Tungsten needle-work distance as close as possible.
To the wire when the action should be timely fill in the molten forward, progress to the right,
No argon, long burning, current, distance, tungsten needle blunt, bath temperature is high, the basic reason is black.
Continuous firing, automatic welding machine for mining can be employed, it is a continuous movement of the weld.
Last seen on television about the TIG "space shot" in the workplace are not using automatic welding machines, protective facilities too common, welding power supplies, pipe, welding guns are not advanced.
This line skills, and playing stringed instruments similar.
Burned black, it is necessary and timely polished or black with acid to remove the surface layerTungsten high melting point (3683 ℃ ± 20 ℃), the electron emission capability, high modulus, low vapor pressure, so it has long been used as a thermal electron emission material [. Pure tungsten copper alloy electrode emission efficiency is low and at high temperatures the formation of equiaxed recrystallized grains leaving the filament sag, break. To overcome these shortcomings, to adapt to modern industrial new technologies, new technology development, national materials workers are committed to research and development of new electrode materials. Some doped tungsten-based low electron work function of rare earth oxides, both to improve the recrystallization temperature, but also activate the electron emission. Rare earth metal oxide has excellent thermal electron emission capability, rare earth tungsten electrode material has been an alternative to conventional radioactive thoriated tungsten electrode material development direction. This article describes several rare earth tungsten electrode material preparation and research, as well as the electrode material on the application of the situation and prospects of the tungsten electrode potential applications, designed for China's rare earth tungsten electrode materials research and application of reference.