active gas

The influence of active gas on chemical compositions and mechanical properlies of HS367L (Crl6 - Ni5 - Fe) and HS135L(CrlZ - Ni5 - Fe) martensitic stainless deposited metals were investigated in Ar- rich MAG welding of OCrl3Ni5Mo martensitic stainless steel for hydro - turbine runners.

针对大型水轮机转轮用ＺＧ０Ｃｒｌ３Ｎｉ５Ｍｏ高强马氏体不锈钢的熔化极气体保护焊工艺，研究了活性气体对焊丝 ＨＳ３６７Ｌ和 ＨＳ１３５Ｌ熔敷金属化学成分和力学性能的影响。

The product is a dry cleaning agent of solvent type) using eteline as major solvent which is mixed with saturated chlorohydrocarbons and fatty compounds containing groups, such as ketone and ether, and a active gas desiccant is added in.

该产品为溶剂型干洗剂,选用氯乙烯为主要溶剂,将其与某些饱和卤代烃和含有酮、醚等化学基团的脂肪族化合物有机溶剂混合,并加入一种活性气体干燥剂,即可制得产品。

In this paper we briefly analyze the mechanism of engendering pores in powder metal material(PM),and study the influence of welding speed and active gas for welding porosity defect.

简要分析了粉末冶金材料激光焊接中气孔的产生机理 ,着重研究了焊接速度与活性气体对气孔形成的影响关系。

The variation characteristics of these trace reactive gases and the factors which influenced them were analyzed under different weather conditions such as in sunny days,rainy days,hazy days and sand-dusty days.

结果表明:(1)痕量活性气体在不同天气条件下具有不同的浓度及日变化特征,晴天和雨天日变化最小,而霾天日变化最大;(2)风向和风速是影响上甸子气体浓度变化的重要因素,同时,夏季降水对SO2和NOx的去除作用较为明显;(3)上甸子O3白天最大值与夜间最小值的比值低于4,远低于城区,不利于光化学污染的形成。