Advice welding smal parts of SS

[Robert1998]

Thanks for the advice. I have set up the welder with 3 seconds of pregas, and the part being welded have a internal volumen of 12cc aprox, and the argon get into from onse side and in the other side I had a small hole to allow a flow of argon. This is why I said it wasn´t very eficient, but it worked

 

[Brad93]

Thanks for the advice. I have set up the welder with 3 seconds of pregas, and the part being welded have a internal volumen of 12cc aprox, and the argon get into from onse side and in the other side I had a small hole to allow a flow of argon. This is why I said it wasn´t very eficient, but it worked

Argon is heavier than air but there is still mixing of the gases.
In industry the standard method is to replace the internal volume with that of argon 3x or 5x over before welding begins.

3 seconds of pre gas is wasteful down the torch for starters and, if there is any sort of restriction in your part (which there is, the small hole) then all the gas will take the easiest route, out of the torch.
Secondly, if you're feeding your torch 10lpm say, that's going to be way way to much flow for the part, assuming that it is being divided equally. Now if you've tried a flow meter on both the torch and the part to set their respective flow that's a different matter.

Still not the right way to do it though. Put a splitter on the regulator at the bottle.

 

[Robert1998]

Ok I'll work with that. I have different valves in the torch and in the purging line and a flow meter, so I'll check the amount of gas in both places. Thank you for the advice