焊缝最小间距

ASME B31.3上面没有找到焊缝最小间距，请问国外项目是怎么要求的

避开热影响区，一般6mm就差不多

好像没有具体规定。焊缝不重叠就可！

ASME B31.3
关于两条环缝的间距：
nterpretation: 7-02
Subject: ASME/ANSI B31.3-1987 Edition, Paras. 304.3.3 and 328; Spacing of Welds
Date Issued: May 24, 1988
File: B31-87-039
Question: In accordance with ASME/ANSI B31.3, are there requirements or guidelines on the minimum distance between welds in a pipe?
Reply: No, except as provided in para. 304.3.3(e).

Interpretation 25-20
Subject: B31.3-2012, Interpretation of Figs. 328.5.4D Acceptable Details for Branch Attachment Welds
Date Issued: September 25, 2014
File: 14-1470
Question 6: Does ASME B31.3 provide any rules or restrictions or limits for the distance between circumferential butt welds in a piping assembly?
Reply 6: No.

本身是个伪命题

B31.3本身没有做相关要求，国内一些石化，石油，化工管道施工标准中，基本是最小为1倍的管径，或者是100mm，150mm.当然作为施工单位，按设计文件依据的标准执行就不会有多大问题。但深入研究焊缝的间距取值，我个人认为是避开焊缝两端的热影响区，不会发生二次热处理叠加影响材料的力学性能。