[MCMIG85]

I noticed my MIG welder losing gas fairly quickly so I checked for gas leaks using soap/water. Lots of bubbles coming from where the regulator threads into my tank. Is this normal? Do most people use teflon tape at this connection to create a better seal? Thanks.

[Jack Ryan]

Tape is for tapered connections, it won't help there. (OK, it might help a bit but it's the wrong approach).

Take the regulator off and check the nipple and the seat for damage or dirt. It is a brass connection and shouldn't be tightened hard.

Have you used the regulator before? Did it leak after a cylinder change?

Jack

[MCMIG85]

I bought the tank and welder used. This is the first time I've actually checked for leaks. The threads look okay to me. And no dirt.

[Jack Ryan]

I bought the tank and welder used. This is the first time I've actually checked for leaks. The threads look okay to me. And no dirt.

Look at the nipple and the seat. If there are dings it will leak.

Jack

[tweake]

as above, they don't seal on the thread. they seal on the oring or rubber tip thats on the end.

[Jack Ryan]

as above, they don't seal on the thread. they seal on the oring or rubber tip thats on the end.

Yes, and some are just brass with no O-ring so it is even more important to have good surfaces. As brass is soft it is a bit forgiving but that also means you don't over tighten it.

Jack

[Oscar]

I've had some leak. Tape won't help on the threads because they dont seal, BUT put some on the cone and watch those soap bubbles disappear.

[Jack Ryan]

I've had some leak. Tape won't help on the threads because they dont seal, BUT put some on the cone and watch those soap bubbles disappear.

That's good for sealing the filter in the regulator as well

Jack