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Welded joints are covered by para. 311 and are required to follow the ASME B31.3 rules for fabrication and examination. In addition, the following specific rules are also provided. Weld backing rings are generally permitted to be left in. However, if the resulting crevice would be detrimental (e.g., subject to corrosion, vibration, or severe cyclic conditions), para. 311.2.3 recommends removing the ring and grinding the internal joint face smooth. Split-backing rings are proh
Welded and brazed joints are the most commonly used methods for joining piping components because these joints are stronger and more leak-tight than threaded and flanged joints. Furthermore, they do not add weight to the piping system as flanges do, and they do not require an increase in pipe wall thickness to compensate for threading, as threaded joints do. Pipe-Weld Joint Preparation and Design Butt Welds. The most common type of joint employed in the fabrication of welded