Abstract
The reducing valve used for a spot welder is characterized by producing a large pressure drop at a lettle discharging range when the welding speed (number of spots/sec.) is increased in a spot welder having a pneumatic system with an air reservior, it is noticed that the electrode pressure with pneumatic system become lower than the pre-set value by following welding when the air reservior is connected to the cylinder nearer than the reducing valve.
This pressure drop can be prevented if the air reservior is inserted between air source (compressor) and reducing valve.
