[Shop-talk] Basic MIG Welding questions

[Marc]

Doesn't the Hobart 140 have a Purge setting?  My Hobart 180 does...

Arvid Jedlicka wrote:
> I have never worried about getting a perfect seal on any of the 
> fittings as I did not think there was much pressure in the line. After 
> all there is this big hole at the end of the gun so ...
>
> I have always just shut the cylinder valve when I was done and let it 
> go at that. I've been more worried about what might leak INTO the 
> lines after I shut it off and left it sit until the next weekend than 
> what the gas that was suppose to be in there did to the plumbing while 
> it was sitting. That is why I usually turn the wire speed down as low 
> as it will go and pull the trigger a few times if it has set unused 
> for a few days. This allows the preflow to purge the air or what ever 
> might have gotten in there while it was sitting unused out and I am 
> sure to get good shielding gas right at the start.