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无垫圈焊接的优越性目前,许多电力基建单位对管径φ≥108毫米的管道仍采用带垫圈V型坡口的接头型式。这种型式的坡口虽有加工方便,易于对口和焊接技术容易掌握的特点,但在施焊时,由于管子内壁与垫圈间所形成的尖角,极易使焊缝根部因收缩应力而引起裂纹。特别是在运行过程中,垫圈不但对流体介质起到阻流作用,影响流速,而且经常受到介质的冲刷;在给水管上,在垫圈与管壁间还经常遭到盐碱浓缩的腐蚀,更能引起焊缝根部裂纹的发生和发展。对管道的使用和
The advantages of non-gasket welding At present, many power infrastructure units for pipe diameter φ ≥ 108 mm pipe is still used with a washer V-groove connector type. Although this type of beveling is easy to process and is easy to handle, it is easy to grasp the characteristics of the welding and the welding technology. However, due to the sharp angle formed between the inner wall of the pipe and the washer, crack. Especially during operation, the gasket not only acts as a choke for the fluid medium but also affects the flow rate and is often washed away by the medium. On the water supply pipe, it is often corroded by saline-alkali condensation between the gasket and the pipe wall. Can cause the occurrence of weld root cracks and development. Use of pipes and