1) Socket welds form fillet welds, while butt welds form butt welds. It
is better to analyze the butt joints from the strength and stress state
of the welds than the sockets. Therefore, in the case of high pressure
grades and occasions where the use conditions are bad, the form of
docking should be adopted.
2) Socket welding is generally used for small diameters of DN40 or less, which is economical. Butt welding is generally used for DN40 or above. The form of socket welding is mainly used for small diameter valves and pipe, pipe fittings and pipe welding. Small-diameter
pipes generally have a thin wall thickness, are easy to be misaligned
and ablated, and are difficult to weld, and are more suitable for socket
welding. In addition, the socket of the socket welding has a reinforcing effect, so it is also used under high pressure. However,
socket welding also has shortcomings. One is that the stress condition
after welding is not good, the welding is not welded, and there are gaps
inside the pipe system. Therefore, the pipe system used for crevice
corrosion sensitive media and the pipeline system with high cleaning
requirements are not suitable. Use socket welding. Furthermore,
for ultra-high pressure pipes, even small-diameter pipes have a large
wall thickness, and it is possible to avoid socket welding by using butt
former must be one big and one small in diameter before it can be
inserted into the weld. The latter diameters may be the same or
different. 2. The welding groove is different in form. 3 welding process is different. The strength after welding is different.
4) Most of the lower pressure grades are smaller socket welds, and the higher pressure grades are often butt welds. Butt welds are 100% tested for flaw detection to ensure no leaks.