There are several welding methods for FRPP pipes

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There are several welding methods for FRPP pipes: Here, the author will introduce two types of connection methods for FRPP pipes – socket welding and butt welding. In the case of socket welding, fillet welds are used, and this method is generally applied to pipes with a diameter of 40 DN or less, such as small-diameter valves and pipes, as well as the welding of fittings to pipes. It is a cost-effective method, but it is suitable for pipes with lower pressure ratings and smaller diameters. Socket welding requires that there be a difference in diameter in order to enable insertion and welding. When the pipeline pressure is less than 0.6 MPa, the connection between PP pipes can be made using a socket connection; simply weld PP electrodes at both ends of the sleeve. For pipe-to-pipe connections where the welding pressure is greater than 0.6 MPa, a butt weld connection can be used; hot melt welding equipment is employed, with the temperature maintained between 190°C and 205°C, followed by adequate cooling. The requirements for butt welding are generally higher than those for socket welding, and the quality after welding also needs to be good; therefore, the inspection methods are relatively strict. For butt welding, radiographic testing is required, while for socket welding, magnetic particle or penetrant testing is used.