Oil-sealed mechanical vacuum pump according to the structure can be divided into fixed-chip, rotary chip and slide valve three. They all use vacuum pump oil to lubricate, seal and cool down. Both are driven by the rotor in the pump housing to periodically change the volume between the rotor, .......

The Heat-Affected Zone (HAZ) is one of the most critical aspects of welding metallurgy. It's the area of base metal that is not melted but has undergone significant changes in its microstructure due to ex.......

The Heat-Affected Zone (HAZ) is one of the most critical aspects of welding metallurgy. It's the area of base metal that is not melted but has undergone significant changes in its microstructure due to ex.......

Summary of this tenth

The light temperature in most of the northern agricultural areas is suitable, and the sensation is better than that in the same period of the past three years, which is conducive to the vigorous growth of autumn harvest crops. The weather in the south of t.......

The Heat-Affected Zone (HAZ) is one of the most critical aspects of welding metallurgy. It's the area of base metal that is not melted but has undergone significant changes in its microstructure due to ex.......

The Heat-Affected Zone (HAZ) is one of the most critical aspects of welding metallurgy. It's the area of base metal that is not melted but has undergone significant changes in its microstructure due to ex.......