What gas does argon arc welding machine use?
Argon arc welding machine must be argon, and there may be a mixture of gas. Sales of welding equipment in Shenzhen
Argon gas arc welding machine, the most commonly used inert gas is argon. It is colorless and odorless. The air content is 0.935% (by volume), the boiling point of argon 186 C between boiling point between oxygen and helium. Argon is a by-product of oxygen production by liquid oxygen from an oxygen plant.Bottled argon is used for welding in China and the filling pressure is 15MPa at room temperature. The cylinder is painted with gray paint and marked "argon". The chemical composition of pure argon requirements: Ar = 99.99%; He = 0.01%; O2 = 0.0015%; H2 = 0.0005%; the total amount of carbon less than 0.001%; the water is less than or equal to 30mg/m3.Argon is an ideal protective gas density than air in 25%, is conducive to the protection of welding arc welding, reduce the consumption of protective gas. Argon is a chemically inert gas that does not react with metals even at high temperatures, without alloy oxidation, burning, and a range of problems. Argon is also insoluble in liquid metals and hence does not cause pores. Argon is a monatomic gas that exists in an atomic state and has no molecular decomposition or atomic absorption at high temperature. The specific heat and heat conduction capacity of argon are small, that is to say, the amount of absorption is small, the heat to the outside is less, the heat in the arc is not easy to dissipate, the welding arc is stable and the heat concentration is concentrated, which is beneficial to the welding.The disadvantage of argon is that the ionization potential is higher. When the arc space is full of argon, the arc ignition is difficult, but once the arc is ignited, it is very stable.
