The main features of the UOE welding process
1) The molding process is separated from the welding process, which is a discontinuous single production.
(2) Can produce thick-walled steel pipe, the maximum wall thickness of up to 4Omm or so.
(3) steel pipe in the same length of the weld length is only half of the spiral weld, weld defects less likely.
(4) High output, the output of one UOE unit is generally equivalent to the total output of 2~4 spiral welded pipe units.
5) Strength and dimensional accuracy of steel pipe are improved by the expansion process.
6) UOE steel pipe is straight seam, which makes pipeline laying and maintenance more convenient.
7) The equipment is larger than spiral welded pipe unit, and the investment cost is high.
Main features of JCOE process
JCOE Each molding process is completed in a large press, steel pipe shaping operation technology requirements, molding unit occupies a long time. Due to multiple molding, compared with UOE process, the processing efficiency is low, but there are fewer molds and lower investment in equipment. Therefore, the number of domestic JCOE units is more than that of UOE units; because JCO is multi-step pressing, the precision of steel pipe size is lower than that of UOE, so UOE steel pipe is mostly used in marine pipelines.
