350P porosity issues

[wagin]

You have a small leak in the gas flow system allowing atmosphere to be sucked into gas flow stream. Atmosphere includes oxygen and results in contamination of weld shield resulting in porosity. Use a spray bottle filled with soapy water to find leak while system is pressurized but not when welding. when welding, the small leak caused a Ventura effect, sucking atmo.

[ryanjones2150]

Vacation? What's that?

[Danno]

Well, I contacted my LWS where I bought the machine(s) and guns and had their people look at the gun with the grips removed and they agree it leaks very bad around where the hose assy. meets the gooseneck. So they gave me a brand new in the box tweeco spraymaster and said Merry Christmas! So I will let you know the out come when I return from vacation.

Merry Christmas everyone!

[Danno]

Had some of the same trouble when I first got my machine. Would weld erratically and could never figure it out. Swapped the push pull for a spool gun and it welded fantastic. Gave the push pull away on ebay, never looked back.

My problem is it does it with both guns, my tweeco #4 and my push pull.

[ja baudin]

Had some of the same trouble when I first got my machine. Would weld erratically and could never figure it out. Swapped the push pull for a spool gun and it welded fantastic. Gave the push pull away on ebay, never looked back.

[H80N]

I was trying to push aluminum. It was a good machine, don't get me wrong, just too detailed thin work for it

For thin aluminum... I tend to go to TIG and the Dynasty 350..... I just LOVE that thing.....

[Checkered Flag]

I was trying to push aluminum. It was a good machine, don't get me wrong, just too detailed thin work for it

[H80N]

I had a 350p, Between being too big for the job and not getting the desired results, I sold it. Turned up high it was great, but down low it was well, just not low enough for what I do.

Never had that problem with mine.... seems to run .023 wire (ER70) just fine on the low end... and it is a wonderful monster on the top end...

[Checkered Flag]

I had a 350p, Between being too big for the job and not getting the desired results, I sold it. Turned up high it was great, but down low it was well, just not low enough for what I do.

[H80N]

ya but it would clean up with gas cranked to the max and weld looked great but 50 cfm flow is crazy high also the oil was not noticable by eye

Am agreeing with ya...

Contamination is one the fist things to look for... along with gas coverage

[mikesystem]

CONTAMINATION...!!!!

Oil would sure muck things up and cause porosity....

ya but it would clean up with gas cranked to the max and weld looked great but 50 cfm flow is crazy high also the oil was not noticable by eye

[H80N]

this is the same problem i had with my hobart i had it pissed me off to the point i bought a new 350p anyways yesterday i started looking to figure out why mine was doing the same as yours if i wanted a clean weld i needed to run it at 50 cfm to get a clean weld if not it looked like popcorn found two things with mine the liner had oil in it down inside i let out about 5 feet or wire and used a white rag wiped the wire down and was oil on the rag it was coming from my wire feed rollers so i cleaned it up changed the liner and now it welds like new again back at 20 cfm but its been doing it for a few years and never really took the time to take it apart and see what the problem was but its mint now

CONTAMINATION...!!!!

Oil would sure muck things up and cause porosity....

.....

Porosity is usually caused by a gas coverage or contamination problems...

[mikesystem]

this is the same problem i had with my hobart i had it pissed me off to the point i bought a new 350p anyways yesterday i started looking to figure out why mine was doing the same as yours if i wanted a clean weld i needed to run it at 50 cfm to get a clean weld if not it looked like popcorn found two things with mine the liner had oil in it down inside i let out about 5 feet or wire and used a white rag wiped the wire down and was oil on the rag it was coming from my wire feed rollers so i cleaned it up changed the liner and now it welds like new again back at 20 cfm but its been doing it for a few years and never really took the time to take it apart and see what the problem was but its mint now

[H80N]

I would still measure gas flow at the nozzle and see how it tally's with the settings at the regulator

Your air pressure test still strikes me as having little utility....

I might blow the lines out backwards though and see if anything pops out

[Danno]

No I am just checking for blockage, so no not with a flow meter at the tip but, it does leak like heck where the goose neck connects to the hose assy. possibly drawing in oxygen.

What this test has done is, proves to me there is no blockage anywhere in the system and that gas or air will freely flow from one end to the other.

The mig gun leaks in the handle area, but the Aluma Pro XR does not.

I looked over the flow rate chart, and for a far back as I can remember I have ran about 20-25cfh on a non pulse machine on any thickness, we just never adjusted the reg./flow meter from there.

Air gas says on this machine 35-40 cfh, man that sounds high! I would think that would draw oxygen right in, maybe even a small child or pet...

But now where to look?