Pipe bevels are primarily used for welding workpieces to ensure weld quality. Normally, the surfaces are machined using machining methods, but can also be cut with gas (if it's a Class I weld that requires ultrasonic testing, only machining methods can be used). However, the oxidation slag must be removed. Depending on the need, there are X-type bevels.ink_feGed" href="https://baike.baidu.com/item/V%E5%9E%8B/0?fromModule=lemma_inlV-typeGroove, U-groove, etc., but most require retaining a certain amount of chamfer.