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Welding in Freezers

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We are in the process of evaluating steel storage racks in a freezer that were modified.  The racks are constructed of channels (ASTM A36 material).  Over the past several years the racks have sustained damage by being hit by forklift trucks.  The racks were repaired/modified by (1) cutting out the bottom 4' to 5' of channel and welding in a new piece or (2) welding pipe to the channel.  The temperature in the freezers is -20 degrees F.  Is it acceptable to weld in these extreme cold temperatures?  If so, what precautions or procedures are required?
 
State highway departments require a minimum temperature of 0 degrees F for welding bridges.    ASME specifies 50 degrees F as a minimum temperature.  Other authorities for piping and process state 0 degrees F.  However, AWS D1.1 does not specify a minimum temperature. 
 
Any thoughts or recommendations would be appreciated.  Thanks.
 
Gary W. Loomis. PE