cups

[bluebobtail]

Hi, this may be a daft question but how do you know what cup size to use.
Is there a general rule of thumb for size of tungsten or does it depend on material rather than tungsten size?
Sorry if this has been asked before

 

[GrahamGKD]

Hi,
The Miller TIG manual says the inside diameter of the cup should be at least three times the diameter of the tungsten. It also goes on about the cup being big enough to provide sufficient shielding without turbulence.

Hope that helps,

Graham.

 

[backpurge]

I'd go for the biggest one you can use