... and minor elbows on condensers and evaporators The main for automatic welding of copper tube small bend on the air conditioning heat exchanger. ... 09 ~ 0.15Gas of combustion-supporting,pressure, MPaOxygen or compressed air, 0.4 ~ 1.0Gas of protection,pressure, MPaNitrogen, 0 ... .4 ~ 1.0Cooling gas,pressure, MPaCompressed air, 0.4 ~ 1.0coolerWater pressure, MPa0.3flow, L/hMore ...