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。
They cause all the welding of double tubes, joint boxes and gas-collecting tubes to realize the backing weld of TAW-P. The quality of the double tube waste heat boilers have been improved.
并对喷嘴、规范参数、坡口形式等作了相应改进，使双套管、联箱、集气管的焊接全部实现了钨极氩弧焊打底，从而提高了双套管废热锅炉的质量。
A membrane electrode assembly prepared using these gas diffusion backing and a fuel are also provided.
还提供了一种利用这些气体扩散衬垫制备的膜电极组件和一种燃料电池。
A membrane electrode assembly prepared using these gas diffusion backing and a fuel are also provided.
还提供了一种利用这些气体扩散衬垫制备的膜电极组件和一种燃料电池。
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