1. Socket welding forms fillet welds, while butt welds form butt welds. From the analysis of the strength of the weld and the stress condition, the bai butt joint is better than the socket. Therefore, the butt joint should be used in the occasions with higher pressure levels and poor use conditions.
2. Socket welding is generally used for small pipe diameters less than or equal to DN40, which is more economical. Butt welding is generally used for those above DN40. The socket welding connection form is mainly used for welding small diameter valves and pipes, pipe fittings and pipes. Small-caliber pipes generally have thinner walls, are prone to edge misalignment and ablation, and are more difficult to butt welding. They are more suitable for socket welding. In addition, the socket of socket welding has a reinforcing effect, so it is often used under high pressure. But socket welding also has disadvantages. One is that the stress condition after welding is not good, and the weld is not penetrated. There are gaps in the pipe system. Therefore, the piping system for crevice corrosion sensitive media and the piping system with high cleanliness requirements are not suitable. Use socket welding. In addition, for ultra-high pressure pipelines, even small-diameter pipelines have a large wall thickness, and socket welding can be avoided as much as possible if they are connected by butt welding.
3. The diameter of the former must be one big and one small before inserting and welding. The diameter of the latter can be the same or different. 2. The welding groove forms are different. 3 The welding process is different. The strength after welding is different.
4. The lower pressure grade and smaller caliber are mostly socket welding, and the higher pressure grade is usually butt welding. Butt welding requires 100% flaw detection test to ensure no leakage.
