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Argon gas wasn't normally used for this purpose, it is a heat retention gas , yes it's heavier than air and yes it will sink and yes it disappears within 3 years ( so much for energy rated windows eh? Lol)
My first suspicion here is that they have used 4mm glass for that sealed unit. A unit of that size would be much better in 6mm tough glass. Yes the airgap is smaller but 6mm glass doesn't deflect as much. You should not have a cold spot in the centre of the unit like that. Personally I have never seen the method Crank suggested for the sealing of the unit, and that is probably due to us using 6mm glass in big sealed units such as this.
There is an industry standard at which point 6mm tough should be used ...as follows . If both dimensions are over 1300mm and also sealed units bigger than the following sizes 1200x2000, 1100x2200, 1000x2700, 900x3000. And any unit over 2.4m3
Those units look bigger than 1300x1300 to me , and looking at the spacer bar size it looks like a 20mm air gap, which would mean if 6mm glass was used the sealed unit will measure 32mm thick , most Ali and pvc double glazed systems only use a 28mm unit , which means the glass can only be 4mm thick. I may be completely wrong as I'm going on what I can see in the picture
My first suspicion here is that they have used 4mm glass for that sealed unit. A unit of that size would be much better in 6mm tough glass. Yes the airgap is smaller but 6mm glass doesn't deflect as much. You should not have a cold spot in the centre of the unit like that. Personally I have never seen the method Crank suggested for the sealing of the unit, and that is probably due to us using 6mm glass in big sealed units such as this.
There is an industry standard at which point 6mm tough should be used ...as follows . If both dimensions are over 1300mm and also sealed units bigger than the following sizes 1200x2000, 1100x2200, 1000x2700, 900x3000. And any unit over 2.4m3
Those units look bigger than 1300x1300 to me , and looking at the spacer bar size it looks like a 20mm air gap, which would mean if 6mm glass was used the sealed unit will measure 32mm thick , most Ali and pvc double glazed systems only use a 28mm unit , which means the glass can only be 4mm thick. I may be completely wrong as I'm going on what I can see in the picture