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> Weld porosity HELP...
ONTHEGRIND
post Dec 16 2013, 09:15 PM
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So I have a Lincoln hd 3200 mig that hasn't been used in a year or so.. I went and got a bottle filled last week argon co2 mix using solid .025 wire with the correct brand new tip welded on brand new steel tried the l/min from very low to very high always welds the same. I can here gas exiting the gun ground is clean here is a photo of what im working with.. The welds are very black be a wire brush on a die grinder makes a pass over them..

The top weld is c 5 settting what it recommends bottom is b5

(IMG:http://www.914world.com/bbs2/uploads_offsite/img.photobucket.com-9738-1387250279.1.jpg)
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gothspeed
post Dec 16 2013, 09:18 PM
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Looks terrible (IMG:style_emoticons/default/sad.gif) ..... Can you hear / feel the shielding gas exiting the nozzle? Undo the wire tensioner and make sure the gas is making its way out.
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ONTHEGRIND
post Dec 16 2013, 09:22 PM
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I can here gas.. Think it was a bad tank the guy filling the tank was very distracted and interested when he figured out where I work he was opening closing valves and asking a million questions about our shop..lol
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rick 918-S
post Dec 16 2013, 09:23 PM
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Check the regulator and the hose. What do you have the regulator set at? Light a match and hold it in front of the nozzle then purge the gas. it should nearly blow out the match. It's clear your gas is not purging through the nozzle.
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McMark
post Dec 16 2013, 09:23 PM
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(IMG:style_emoticons/default/agree.gif) with gas flow. What about polarity? Double check that too. Also double check you didn't accidentally get flux core wire.
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ONTHEGRIND
post Dec 16 2013, 09:26 PM
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Blows out a lighter
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ONTHEGRIND
post Dec 16 2013, 09:27 PM
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Yup checked polarity and even replaced the spool both did the same 1000 psi in the bottle
Reg I tried from 10 L/min to 60 l/min
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injunmort
post Dec 16 2013, 09:27 PM
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the row on the bottom definitely looks like flux core wire, a lot of splatter and smoke
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stugray
post Dec 16 2013, 09:28 PM
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Could be too much flow.

Are you using a FLOW meter or just a pressure meter?
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ONTHEGRIND
post Dec 16 2013, 09:32 PM
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Just a pressure meter.. I tried high and low..I used it before and it welded really clean that was my first time welding in about a year..
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gothspeed
post Dec 16 2013, 09:36 PM
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Sounds like it may be contaminated gas ...... maybe moisture in the line(s) or even the freshly filled tank ....... (IMG:style_emoticons/default/sad.gif)
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914_teener
post Dec 16 2013, 09:42 PM
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You are using a high pressure regulator instead of a flow meter? You should be using a flow meter with the correct cup.

The metal is oxidizing there from the looks of it.

With solid wire you should be using tri-mix (helium-Co2-Argon)

The gas could be creating a vortex from the cup at too high a velocity and actually sucking the ambient o2 into the cooling metal....

My two cents.
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ONTHEGRIND
post Dec 16 2013, 09:51 PM
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Its the reg that came with the unit.. It reads bottle pressure and liters per min wire is superarc l-56 from Lincoln even with very little bottle pressure or no bottle on still the same.. must be wrong gas ? good thing its not n20 lol
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gothspeed
post Dec 16 2013, 10:00 PM
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I think 75% Argon/ 25% Co2 ...... is what I have used on my MIG ..... works perfectly .... (IMG:style_emoticons/default/smile.gif)
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914_teener
post Dec 16 2013, 10:06 PM
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My bad sorry.....

tri mix is for stainless...

Argon at 20-25 % and the balance C02 should be fine for carbon steel stock 1/8 and under.

Mark is right...did you get flux core and not solid wire? Flux core is hollow and should say it on the spool.

Something is contaminating the weld...dirty liner in the gun...I think somebody already said water. Is condensate from you bottle getting in the gun? Is there garbage on the base metal? Are you running the right voltage? Right nozzle as gas flow? Is there grease from your hands on the wire?


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914_teener
post Dec 16 2013, 10:07 PM
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That puddle is cold too.....
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rick 918-S
post Dec 16 2013, 10:09 PM
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Is your wire rusty? How old is the wire spool? It should still weld better than that but would cause drag in the liner and lots of spatter.

Could be the wrong gas.
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toolguy
post Dec 16 2013, 10:27 PM
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Bad ground connection. . . rusty wire. . not hot enough or no shielding gas. . take your pick one or all. . . I've not had good results with Lincoln welders. . , they are way too finicky to adjust. . parameters too narrow compared to a Miller. .
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ONTHEGRIND
post Dec 16 2013, 10:42 PM
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Wire is new just unpackaged today tried different spools. Has not problem melting through 16 guage steel on c setting ground is on clean steel..
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McMark
post Dec 16 2013, 10:49 PM
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Perhaps clean the main connections in the box.
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