When a concept is not clearly understood or misunderstood or half boiled!!!, there we get easily confused. There are some people really to confuse you by triggering a little twisted question and make you to get confused. To avoid loosing the conversation we start argue to prove our self correct. So it is important and vital to understand the basic fundamentals.
What is Composition?
Our earth is composed of many gases like Nitrogen,Oxygen, Co2, Hydrogen etc at certain percentages. So Composition of Atmospheric air is 78% Nitrogen + 21% Oxygen + 1% Argon + Other gases. Or we can say the Atmospheric air is mixture of these gases.
Let us take another Golden Example!!!
We know Gold and is available in different quality levels such as 24kt, 22kt, 18kt etc. 24kt gold is pure gold and nothing mixed to it and stands Single. In 22kt and 18kt, Gold is mixed with copper at certain amounts to make the gold suitable for ornaments. So 22kt or 18kt gold is Mixed with copper or Composed of copper at certain percentages ( 22 parts gold / 2 parts copper or 18 parts gold / 6 parts copper).
If say, I have 24kt Gold means it is pure gold. Single
If say, I have 22kt Gold means it is a mixture or composition of Gold and Copper ( 91.66 % Gold + 8.33% Copper). 91.66% of Gold is Pure Gold and balance 8.33% is Pure Copper.
If say, I have 18kt Gold means it is a mixture or composition of Gold and Copper (75 % Gold + 25% Copper). 75% of Gold is Pure Gold and balance 25% is Pure Copper.
STOP! STOP!!. How is 18kt gold composition arrived ?
18 divided by 24 and multiplied by 100 gives in percentage
Welding Gas Composition
Similarly in Gas Welding process(es), the Gas Composition is an essential variable. WPS shall always be written as either Single or Mixture.
if Gas mixtures or Compositions used, shall always be specified such as 98% Argon + 2 % H2 etc. Not the Purity of the Argon Gas ie 99.99%.
If only argon is used, specify in the WPS as single gas ( some times Client may ask you specify the Purity levels for SS, DSS, SDSS or Titanium metals)
Composition Vs Purity
Composition of Gas will affect the Arc Characteristics, thereby influence arc energy, penetration, weld profile, weld fluidity etc
Purity of Gas will affect the weld quality and corrosion properties
I tried to simplify the topic as much as possible and hope the lesson can be understood easily and clearly
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