Anyone know anything about mig welding machines?Gas problem.

[robbocop33]

I've finding this really annoying and i cant get on with my restoration.For some reason the gas was reaching the gun fine,but where the white plastic liner goes into the metal block in the gun the gas was just coming back out??Instead of going up the swan neck to the tip?
After much swearing and blowing compressed in a reverse direction through the gun nothing improved.I then said sod it and ordered a complete new gun,shoved the white gas liner into the push fit connector at the gun,switched the gas on and it's still doing it!!!Aaaaaaaahhhhh!!!
What's going on?The little connector the gas line goes into in the gun has a death grip on the liner,you just cant pull the gas line out no matter how much you pull,so it cant be leaking,anyone any ideas?
Heres a pic of the white gas tube and the connector where the gas is coming back out of.

[Fugazi]

It's a Festo fitting, you push the black plastic ring in and simultaneously pull out the white airline.

[robbocop33]

Yes,i kind of figured that out.The liner is firmly gripped in there but when i put my nose to the connection i can feel,smell gas coming out?

[grumpy52]

I would suggest that if you have to put something as sensitive as your nose against a pipe connected direct to a gas supply that the block in the gun is not the problem .Do you have a gauge on the bottle ? Most common cause would be a kink in the hard plastic pipe inside the outer combo pipe between gun and machine , also pipe from gauge to machine tends to perish and leak & split at the joints .
Ours at work tended to have the guns and pipework replaced every 9 -12 months and tips and shrouds on a monthly basis , but they were worked 8 to 12 hrs per day .

[robbocop33]

The gas is making it all the way down the liner to the gun no problem,gas flies out as strongly as the supplies coming out my bottle,no restrictions.
Only reason i was using my nose was i couldn't be 100% sure by feel where it was coming out.Its definetly just coming back out the festo connector at the gun end.
Something must be blocked in there but with it happening as well with a new gun im stumped?

[Snake the Sniper]

Is there sufficient spare white pipe to trim the end back a bit? Could the open end have gotten kinked a tiny bit in removing it from the first block?

As you say there's still gas coming out of the gun as expected, how is this a problem? Or am I missing something here?

[robbocop33]

Snake the Sniper said:

Is there sufficient spare white pipe to trim the end back a bit? Could the open end have gotten kinked a tiny bit in removing it from the first block?

As you say there's still gas coming out of the gun as expected, how is this a problem? Or am I missing something here?

I trimmed it back just to rule that out.The gas comes out within the gun at the connector at the end of the gas hose.It doesn't make it as far as going up the swan neck to the tip of the welder to create a gas shroud around my weld.

[colinjy]

just order a new gun ?

[robbocop33]

I've just got a new gun and its still doing it.