C2H4, derived from natural gas and petroleum and used as a source of many organic compounds, in welding and cutting metals, to color citrus fruits, and as an anesthetic.
乙烯一种无色易燃气体，C2H4，可从天然气和石油中获得，用作许多有机化合物的来源，用于焊接和切割金属，柑桔属水果的着色，以及用作麻醉剂。
However, hardly and weakly intermetallic compounds are easy to form at welding interface in conventional welding process in wide composition range.
然而，几乎和弱间化合物很容易在焊接界面形式在传统焊接过程中的组成范围广泛。
Acetylene (ethyne) Simplest alkyne, C2H2. A colourless, flammable, explosive gas, it is used as a fuel in welding and cutting metals and as a raw material for many organic compounds and plastics.
乙炔：最简单的炔(C2H2)，无色可燃气体，广泛用作金属焰焊接和切割的燃料，也是合成许多有机化学品和塑料的原料。
Hardness value of welding area is higher than that of 316l and aluminum. It indicates that there are the compounds on the interface.
焊缝区的硬度值较基体316L板及铝板各自的硬度值高，表明界面有化合物存在。
Hardness value of welding area is higher than that of 316l and aluminum. It indicates that there are the compounds on the interface.
焊缝区的硬度值较基体316L板及铝板各自的硬度值高，表明界面有化合物存在。
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