1.
Indicates back or backing. Use in conjunction with a groove symbol.
指示底焊或封底焊。与沟符号一起使用。
2.
The PQR shall include the composition and flow rate of the shielding and inert gas backing, when used.
焊接工艺评定记录单上应包括封底焊时所用的惰性保护气体组成成分和流率。
3.
Fourth cover: Outside back cover of a periodical.
封四:期刊的封底。
4.
internal undercut
焊道底边或内表面咬肉
5.
I shall write to you again at the end of the month.
我月底给你再写一封信.
6.
semipacked bottom-hole assembly
半封隔井底钻具组合
7.
Back cover: The sheet covering the end of a book.
封底:书本的最后一面。
8.
Study on Wear Resistance of the Electrodes of Cr13 Alloy System for Valve Sealing Surface;
Cr13系阀门密封面堆焊焊条耐磨性的研究
9.
Parameters optimization of fillet weld sealing joint in high pressure hydrogenation heat exchange
加氢换热器角焊缝密封接头焊接工艺参数优化
10.
Solder Ball Attachment Assessment of Reballed Plastic Ball Grid Array Packages
再成形(Re-Balled)焊球阵列封装的焊球强度评估
11.
The price of a book is usually inside the front cover or on the back cover.
书价通常印在封面内或封底上。
12.
The backing plate shall be welded with matching electrodes so that the weld on the clad side is flush with the backing plate surface.
底板用配套焊条焊接，使复层侧的焊缝与背衬板表面齐平。
13.
Seat hardfaced with SS410 and seal welded.
配置410不锈钢和密封焊接的阀座硬面。
14.
welded metal-bellows mechanical seal
焊接金属波纹管机械密封
15.
Seat ring is seal welded to eliminate leak path.
阀座环通过密封焊接，消除泄漏通道。
16.
New Stainless Steel Heap Welding Technique for Main Steam Valve Sealing Suface
主蒸汽阀门密封面不锈钢堆焊新工艺
17.
An Overview of Non destructive Inspection in Flip Chip Packaging
倒装焊芯片封装中的非接触检测技术
18.
Finite element analysis on soldered joint reliability of QFN device
QFN封装焊点可靠性的有限元分析