Can liquid nitrogen be used to cool resistance welding equipment?

If the resistance welding application is a high speed high power application requiring a lot of power, considerable cooling will be required. This is normally supplied by water systems in the form of city water, recirculated cooling towers or chillers. When cooling is critical due to unusual power and heat being generated attention must be taken to insure that:

Critical components are tested for adequate flow at the proper temperatures.

Water tubes are properly positioned

Chill block and all cooling channels are free of blockages

Chill blocks may need to have additional cooling channels

An upgrade from city or water tower to a chiller may be needed

Water flow meters should be installed and monitored on individual components

Yes, one could consider liquid nitrogen cooling. It is very cold, -195 deg C (-320 deg F). This extreme temperature is well below the 18-29 deg C (65-85 deg F) the AWS J1.2 recommended cooling temperature for a resistance welder.

Should one use liquid nitrogen cooling for resistance welding?  Liquid nitrogen probably is not practical.

 Water Cooled SCR Contactors                            Machine Transformer



The extreme cold temperature differential likely would cause distortion in SCR chill blocks. The SCR must have full contact with the chill block for proper cooling.

The chill blocks and internal passages of a transformer have not been designed for sub zero cooling. Distortion and condensation are likely. Super cold temperatures can lead to condensation which is never good in the control or transformer.

Additionally special insulation would be necessary on the feed lines to maintain the temperature.

Cost of nitrogen versus water or chiller would be high.

Water/chiller based systems when set up properly, monitored and maintained can handle resistance welding applications. Liquid nitrogen is probably not practical for consideration as a cooling medium in resistance welding.

Reference: AWS J1.2:2016


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