Once you weld with a gas lens tig kit, its hard to go back to the standard collet bodies that come with most tig torches.
A friend of mine hired on at a company that did R&D work for the Department of Energy.
On his first day on the job, he was asked to repair a bunch of bad welds on a $100,000 part someone else had welded.
The part was a hydrogen generator and was made from Haynes 188 which is a super expensive alloy.
The older guy who made the welds was a good welder but old school and didn't use a gas lens even though even though the welds were hard to reach and required a pretty long tungsten stickout....and the alloy was haynes 188 which really needs a lot of gas coverage.
So the welds were gray and crusty and all 21 welds had failed the hydro leak test.
So my friend ground out all the leaking welds and re-welded everything using a gas lens kit that he just happened to have in his tool bag.
...And all his welds passed the pressure leak test.
Do you think he made a good impression for his first day on the job?
A gas lens has several fine diffuser screens that act like the screens in a water faucet to make the argon flow smoother and with less turbulence.
The non turbulent flow lets you push argon further for those situations when you have to extend the tungsten out far to reach a tight spot or down in a hole.
You don't always need a gas lens tig kit, but its better to have one and not need it, than to need one and not have it.
There are certain aluminum jobs where a standard collet body does well.
I have a few friends who really like a #5 cup with a standard collet body for tig welding aluminum.
In my own experience, I have found using a #5 or #6 gas lens cup works better for the type of work I do than a collet body.
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