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发表于 2018-12-28 09:37:01
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本帖最后由 yangyangshu 于 2019-1-19 15:58 编辑
回答楼主的这个问题,还需要考虑楼主的这个SA-516 Gr.70的材料是用于什么产品的(是ASME VIII-1产品还是ASME VIII-2产品,或者其他产品?),还需要知道是用在什么部位(如果是用在筒体,那么筒体又是与什么相焊,形成什么样的焊接接头?)
在ASME VIII-1中,对焊接坡口的表面进行MT或PT, 只有一处提到了。见ASME VIII-1, UG-93 INSPECTION OF MATERIAL (d)(3):
When a pressure part is to be welded to a flat plate thicker than 1/2 in. (13 mm) to form a corner joint under the provision of UW-13(e), the weld joint preparation in the flat plate shall be examined before welding as specified in (d)(4) below by either the magnetic particle or liquid penetrant methods. After welding, both the peripheral edge of the flat plate and any remaining exposed surface of the weld joint preparation shall be reexamined by the magnetic particle or liquid penetrant methods as specified in (d)(4) below. When the plate is nonmagnetic, only the liquid penetrant method shall be used.
当一个受压件要与厚度超过1/2in[13mm]的平板按UW-13(e)的规定焊接成角接接头时,如下面(d)(4)所规定,应在焊接前对平板的焊接接头坡口采用磁粉或液体渗透方法进行如下面(d)(4)所规定的复检,若板材属于非磁性材料,只允许采用液体渗透法。
即参见 ASME VIII-1的附图UW 13.2,平板的典型焊接接头坡口,如图中(b), (c), (d), (f)及(n),是要做MT或PT的。图(e)中平板厚度超过13mm,也是要做MT或PT的。
这里ASME规范中用的是“shall be”,就表示是强制性的要求了。
在ASME VIII-2中,类似的规定与上面的相同,见ASME VIII-2, 6.1.3.1 Examination of Materials. (d)
If a pressure part is to be welded to a flat plate thicker than 13 mm (1/2 in.) to form a corner joint in accordance with 4.2.5.4(d), then the weld joint preparation and the peripheral edges of the flat plate forming a corner joint shall be examined as described below before welding by either the magnetic particle or liquid penetrant method in accordance with Part 7. After welding, the peripheral edge of the flat plate and any remaining exposed sur-face of the weld joint preparation shall be reexamined as specified below.
如果受压部件焊接于大于13 mm (1/2 in.)的平板,且形成4.2.5.4(d)规定的角接接头时,则平板焊缝坡口和边缘周边在焊前应按下列规定的用第7 篇磁粉法或液体渗透法检测。焊后应对所有仍暴露的边缘和焊接表面再按下列规定进行检测。
即参见 ASME VIII-2的4.2.5.4(d)规定的角接接头时,平板焊缝坡口和边缘周边在焊前是要做MT或PT的。
这里ASME规范中用的也是“shall be”,就表示是强制性的要求了。
关于此问题,楼主还可以参考偶在下面这个帖子中的回复:
压力容器筒体板材坡口PT检测,asme中有无强制要求
http://www.asimi8.com/forum.php? ... 16&fromuid=5389
(出处: ASME中国制造)
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