关于热处理延后无损检测

CHY7

AWS要求ASTM A514，A517，A709 HPS 100W[690W]级的钢需要焊后48小时做NDT，国内材质牌号不一样。

ganjb

感谢楼主的分享,学习学习。

小蜜蜂

资料不错，感谢分享

Cretebull

ASME Sec VIII-2卷6.4.5.2
(g) After the finished repair weld has reached ambient temperature, it shall be examined using the magnetic particle
or liquid penetrant examination methods in accordance with Part 7. If the examination is by magnetic particle method,
only the alternating current yoke type is acceptable. For P-No. 3 Gr. No.3 materials, the examination shall be made after
the material has been at ambient temperature for a minimum period of 48 hr to determine the presence of possible delayed
cracking of the weld. In addition, welded repairs greater than 10 mm (3/8 in.) deep in materials, and in welds that
are required to be examined using the radiographic method in accordance with Part 7, shall be examined using the
radiographic method in accordance with Part 7.


P-No.3 Gr. No.3的材料有延迟裂纹倾向，在热处理将至室温最少48小时候NDT

mrmalcolm

Cretebull 发表于 2019-10-16 16:47
ASME Sec VIII-2卷6.4.5.2
(g) After the finished repair weld has reached ambient temperature, it sha ...

多谢，P-No.3 Gr. No.3的材料是哪一类材料？我查规范，是材料强度越高，时间要求越长。

mrmalcolm

Simon70925 发表于 2019-7-31 09:24
船级社有标准，是根据屈服强度大小来的。应该在420N/mm2。要求的值各个船级社有少许的差别。要求48小时。还 ...

谢谢回复，如果进行了焊后热处理，那就不需要延后无损检测了吧谢谢

catyan

有没有延迟裂纹倾向，应该是焊接工艺评定做出来的

mrmalcolm

catyan 发表于 2020-11-20 10:50
有没有延迟裂纹倾向，应该是焊接工艺评定做出来的

如果焊接工艺评定没发现延迟裂纹，实际焊接时也不需要延迟无损检测吗

catyan

相关设计规范中或者材料规范中，或者权威资料中，未说明有延迟裂纹倾向，做焊接工艺试验也没有发现有延迟裂纹倾向，
那就不应该说有延迟裂纹倾向

比如，国内容器，你看看设计文件，如容规，GB150之类，没有说明，查所用材料的材料规范，如ASTM材料规范，或RCC-M材料篇，当然要看你的材料是啥，