Cooling bed with chain cooling bed, worm bed type and rack type cooling bed. According to the performance requirements of large diameter welded pipe, cooling can be done in different ways.

Forced cooling. Large diameter welded pipe requires metal has certain organization and physical properties, should take control cooling speed method. Such as bearing pipe, in order to prevent the precipitation of carbide carbide, requiring cooling rate of not less than 50-70C/min, and take ventilation or water mist forced cooling.

Natural cooling. For large diameter welded pipe without special performance requirements, can be natural cooling in the atmosphere.

Set, reducing the large diameter pipe temperature at 700~900 Deg. C, must be cooled to 50 DEG C, sent to the finishing processing equipment, to improve working conditions, improve the finishing quality.