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液氩
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液氩

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产品说明
氩气是无色、无味、单原子的惰性气体,原子量为39.948,密度为 1.78kg/m3(空气密度为 1.29kg/m 3)。氩气的重量是空气的1.4倍,可在熔池上方形成一层稳定的气流层,具有良好的保护性能。另外在焊接过程中,产生的烟雾较少,便于控制焊接熔池和电弧。氩气是一种惰性气体,在常温下与其它物质均不发生化学反应,在高温下也不溶于液态金属中,故在焊接有色金属时更能显示其优越性氩气是一种单原子气体,在高温下,氩气直接离解为正离子和电子,因此能量损耗低,电弧燃烧稳定。同时分解后的正离子体积和质量较大,对阴极的冲击力很强,具有强烈的阴极破碎作用。氩气对电弧的冷却作用小,所以电弧在氩气中燃烧时,热量损耗小,稳定性比较好。氩气对电弧的热收缩效应较小,加上氩弧的电位梯度和电流密度不大,维持氩弧燃烧的电压较低,一般10V即可。故焊接时电弧拉长,其电压改变不大,电弧不易熄灭。这点对手工氩弧焊非常有利。氩气是制氧的副产品,因为氩气的沸点介于氧、氮之间,差值很小,所以在氩气中常残留一定数量的杂质。焊接用氩气按我国GB4842-84 (氩气及其检验方法)标准要求,其纯度应达到99.99%。具体技术要求见下表,如果氩气中的杂质含量超过规定标准,在焊接过程中不但影响对熔化金属的保护,而且极易使焊缝产生气孔、夹渣等缺陷,使焊接接头质量变坏,并使钨极的烧损量也增加。
氩气的主要应用于焊接、不锈钢制造、冶炼,还用于半导体制造工艺中的化学气相淀积、晶体生长、热氧化、外延、扩散、多晶硅、钨化、离子注入、载流、烧结等。用作ICP,气相色谱仪等仪器的载气,标准气、平衡气、零点气等。
应用领域
不锈钢焊接保护气体
铝合金焊接保护气体
铜合金的焊接保护气体
高纯氩气广泛用于ICP光谱仪
高纯氩气广泛用于节能灯、白炽灯、日光灯的填充气体
高纯氩气用于ArF准分子激光气体
超纯氩气用于电子行业制造
注意事项
氩气管道应该是密封、不漏气。提供良好的自然通风条件。操作人员必须经过专门培训,严格遵守操作规程。防止气体泄漏到工作场所空气中。搬运时轻装轻卸,防止钢瓶及附件破损。配备泄漏应急处理设备。氩气是一种无色、无味、无毒的不燃烧的储存于气瓶中的高压气体。当其含量增加导致氧气含量低于19.5%时有可能引起窒息。配备自吸式呼吸面具。瓶装气体产品为高压充装气体,使用时应经减压降压后方可使用。包装的气瓶上均有使用的年限,凡到期的气瓶必须送往有部门进行安全检验,方能继续使用。每瓶气体在使用到尾气时,应保留瓶内余压在0.5MPa,不得低于0.25MPa余压,应将瓶阀关闭,以保证气体质量和使用安全。瓶装气体产品在运输储存、使用时都应分类堆放,严禁可燃气体与助燃气体堆放在一起,不准靠近明火和热源,应做到勿近火、勿沾油腊、勿爆晒、勿重抛、勿撞击,严禁在气瓶身上进行引弧或电弧,严禁野蛮装卸。
物理化学性质
分子量:39.948
熔点:-189.2℃
沸点(101.325kPa):-185.9℃
液体密度(83.78K,68.749kPa):1416.6 kg/m3
气体密度(273.15K,101.325kPa):1.7841 kg/m3
相对密度(气体,0℃,101.325kPa):1.380
比容(21.1℃,101.325kPa):0.6037m3/kg
气液容积比(15℃,100KPa):835L/L
临界温度:-122.4℃
临界压力:4864kPa
临界密度:530.7kg/m3
熔化热(-189.37℃,68.7kPa):29.43 kJ/kg
气化热(-185.86℃,101.325kPa):160.81kJ/kg
比热容(100kPa,270K):Cp=519.16 J/(kg•K)
(100kPa,300K):Cv=309.82 J/(kg•K)
比热比(气体,26.85℃,101.325kPa):1.669
蒸气压(-191.885℃):53.33 kPa
(-181.301℃):159.99 kPa
(-178.880℃):199.98 kPa
粘度(270K,100kPa):0.02083 mPa•s
表面张力(84K):11.46 mN/m
导热系数(270K,100kPa):0.01620 W/(m•K)
折射率(气体,0℃,101.325kPa,2441.6?):1.00030378
规格及技术指标
容器规格
容器尺寸 (cm)
平均重量 (kg)
阀门/螺纹出口 
充装量
40L
22×140
59
 QF-2 螺纹G5/8
13.5MPa/5.4Nm3/59kg
175L杜瓦罐
51×160
336
 QF-2 螺纹G5/8
220kg
20~100m3储槽
260×800以上
3200以上
 按客户需求
28~140吨
 
 
 
 
 
成分
 
纯氩
高纯氩气 
超纯氩气
单位
氩气
99.99%
100.00%
100.00%
%V
氢气
5
0.5
0.1
ppmv
氧气
10
1.5
0.5
ppmv
氮气
50
4
0.2
ppmv
甲烷+一氧化碳+二氧化碳
5+5+10
1
0.1+0.1+0.1
ppmv
水份
15
3
0.2
ppmv

 

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