The elbow element and the straight pipe are assembled and welded into a serpentine tube: the other is the "standard elbow" and the straight pipe are assembled and welded into a serpentine tube. The method is to bend the short pipe into flat elbow elements at both ends, and then assemble and weld the straight pipe and the elbow into a serpentine pipe according to the design requirements.

   The advantage of these two methods is that the bent pipe does not require a large area, the pipe used is short, and the material utilization rate is high. In order to improve the cutting accuracy, cutting speed and raw material utilization rate, the electronic computer can be used to arrange the tube cutting program. This method has a low degree of automation, and this process is no longer used by power plant boiler manufacturers.

The elbow element and the straight pipe are assembled and welded into a serpentine tube: this method uses two types of elbow elements: one is to weld the cane-shaped elbow element. According to the design size, the straight pipes are bent into a cane-shaped element with an elbow at one end, and then the cane-shaped elements are assembled and welded one by one.

 

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