Argon arc welding is a welding technology based on general arc welding principle that uses argon to protect metal welding material and melts welding material into liquid on the base material through high current so as to form a weld pool, to let weld metal and welding material achieve metallurgical bonding. In a nutshell, it is…
Nowadays, numerous building-related diseases are caused by poor indoor air quality. For example, the chemicals of indoor decoration materials will slowly dissipate into indoor environment as time goes on, which will induce a certain degree of health and safety hazards to people who stay indoor for a long time. For air…
Vacuum valve is used in a vacuum system to change the direction of airflow, adjust air mass flow and cut off or connect pipes in the vacuum system. Vacuum valve close parts are sealed by rubber or metal seal ring. Vacuum electromagnetic valve is controlled by AC or DC power supply to turn on…
Since the reform and opening-up, fruits and vegetables industry of China have developed rapidly. Vegetables and fruits have become the second and third largest industries of China’s planting industry after grain. Since 1993, the vegetable yield of China has ranked the world and become the biggest fruit country in the world….
