This paper describes the reasons for various kinds of defects of backing weld and their recognition on X_rays films It also introduces the protective measures for them

Indirect Quirk Backing Weld of Thick-walled Vessel

厚壁容器的单面深槽打底焊

Penetrant flaw detection agent was used to detect the backing weld surface, and the number of cracks was indicated by surface crack rate.

打底焊缝正面使用渗透探伤剂探伤，用表面裂纹率表示裂纹的数量。

Basic flux-cored wire for backing weld to T91 tube was studied in this paper.

研究了用于T91钢管打底焊的碱性渣系药芯焊丝。

The Development of An All-Position Automatic Welder with STT Technology for Pipe Backing Weld

STT全位置自动打底焊机的研制

Investigation into Backing Weld Procedure Technique of All-position Narrow Gap and Thick-walled Pipe Welding

管道全位置焊接打底焊工艺研究

Progress in backing weld technology for stainless steel tubes

不锈钢管打底焊接工艺的进展

All wire burned sections are to be mounted in hardened tool steel with hardened backing plate.

所有的线割入子必须安装在热处理的模板上并有热处理后的支撑板。

Effects of the backing plate of a wholly grouted rock bolt

全长锚固锚杆的托板效应用钢板折叠成的建筑

Study on the penetration performance of ceramic armors with different backing plate

不同背板对陶瓷复合装甲抗弹性能影响的研究

Bonding of Target Material and Backing Plate for 9900 Sputtering System

9900型靶材与靶托的连接技术

Stay right there, backing off.

站住别动，退后

Q: so far European investors are backing off.

问：欧洲投资者迄今不敢投资。

B: The customer is backing off. We need to find out why.

B:客户在退缩，我们得找找原因。

I don't think it is a reason for backing off.

我认为这不是我们应该后退的理由。

The backing pressure of seal changed, in the mean time clean gas supply is changing accordingly to keep constant different pressure between seal gas supply and backing pressure. This will ensure a stable working environment of DGS.

干气密封背压变化时，密封气供应需保持动态跟随，使密封气与其背压之间的压差保持恒定，以此来保证干气密封稳定的密封环境。

Introduces the newly developed K-800A HV oil diffusion pump for its design of broadened range of pumping speed, increased critical backing pressure and reduced backstreaming rate.

介绍了新研制的高真空油扩散泵在拓宽抽气速率范围、提高临界前级压力、降低返油率方面的创新设计。

Grade. Calculation of Critical Backing Pressure and Diffuser Throat Diameter of Oil Vapour Pump

油蒸汽流泵的临界前级压力及扩压器喉部直径的计算

In addition, when the strain was equal, backing pressure could significantly lower the rate of cavity.

在相同的应变时，背压的加载能显著降低空洞的体积分数。

The third one, tbe backing pressure type, is based upon the other two types.

第三组&背压式结构是在前二组密封部件基础上改进而成的。

Exploration of the Influence of Backing Pressure on the Efficiency of Hydraulic Motor

背压对液压马达效率影响的探讨