hi, when welding body panels with a mig welder what should the gas pressure be on?
cheers
mig gas pressure
Started by
_2wild4u_
, May 12 2011 11:57 PM
17 replies to this topic
#2
Statler
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Posted 13 May 2011 - 12:09 AM
Indoors or out doors?
Gauges & regulators offer only a guide. They aren't accurately calibrated.
General rule of thumb, around 12-15ltrs.
If there are black/brown sooty deposits in the HAZ [heat affected zone], then gradualy cut back on the gas flow until you find a happy medium.
Or... if you are a back yarder, when you pull the trigger, the nozzle should say psssshht.
Gauges & regulators offer only a guide. They aren't accurately calibrated.
General rule of thumb, around 12-15ltrs.
If there are black/brown sooty deposits in the HAZ [heat affected zone], then gradualy cut back on the gas flow until you find a happy medium.
Or... if you are a back yarder, when you pull the trigger, the nozzle should say psssshht.
#3
rodomo
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Posted 13 May 2011 - 12:31 AM
And wind! What a difference THAT makes.Indoors or out doors?
#4
_nial8r_
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Posted 13 May 2011 - 09:24 AM
my gauges say about 5ltrs/min and works well but like col said the gauges aren't accurately calibrated so just go off the sound of the gun when you press the trigger ( pppsssss ) and welding in the wind with a mig is just one big friggin nightmare and is almost impossable 
unless you do what i do and get the wife to stand there with a piece of ply wood 
unless you do what i do and get the wife to stand there with a piece of ply wood
#5
Mort
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Posted 13 May 2011 - 09:53 AM
Too much baked beans Rob 
.
Sorry couldn't help myself
.Sorry couldn't help myself
#6
355LX
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Posted 14 May 2011 - 02:04 PM
I work with about 16-17ltrs/min and am ina car port.
Dave
Dave
#8
FastEHHolden
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Posted 15 May 2011 - 10:39 PM
My welder's instruction book says 5 lt / min...i think i use a little more than that ...its hard to tell as my flow meter is on an angle
#9
_nzstato_
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Posted 16 May 2011 - 05:38 AM
I find 6-7 lt/min works well for me. Anymore and the weld is either too cold and when it heats up it blows it straight through
#10
LXM21
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Posted 16 May 2011 - 08:04 PM
I find 6-7 lt/min works well for me. Anymore and the weld is either too cold and when it heats up it blows it straight through
Above has got little to do with gas flow. More like an amps/volts/wire feed issue.
Ideal gas flow 11-13lit/min
#11
_Holden89nut_
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Posted 07 June 2012 - 09:03 PM
Gas flow and mixture has a massive effect on heat input of the weld, gas flow will depend on size of the mig shroud and Amps and volts. This comes from a full qualified boilermaker with welding tickets and numerous fillet welds and full strength butts test to mag particle, ultra sonic, x ray and macro etc
For a medium size nozzle I would say 10 to 13 ltrs
For a medium size nozzle I would say 10 to 13 ltrs
#12
_shan620_
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Posted 07 June 2012 - 11:39 PM
does the gas pressure change with the different thickness's of metal thats being welded?
#13
_Holden89nut_
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Posted 08 June 2012 - 07:02 AM
Not so much pressure but type, if using boc gas, use Argo shield light, if welding heavier steel like 10mm plus start looking into Argo shield universal
#14
Shtstr
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Posted 08 June 2012 - 08:06 AM
do some test welds on some spare steel. if you get bubbles then turn the gas up more till it is all gone and thats where you should be. bubbles are porisity and thats no good.
#15
Ruts
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Posted 08 June 2012 - 11:45 AM
Or... if you are a back yarder, when you pull the trigger, the nozzle should say psssshht.
How does it go again Col???
#16
Statler
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Posted 08 June 2012 - 12:48 PM
I don't know m8, it's been a while. 
#17
_turbotorrie_
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Posted 11 July 2012 - 09:20 PM
Every where I have worked we always ran 25lts/min with wire from .8 to 1.5 welding thin and thick steel
#18
_TorYoda_
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Posted 18 July 2012 - 10:32 PM
I have always used the 5-6 l/minute as taught to me in Boilermaker school over 30 years ago. If it's windy outdoors more is sometimes needed. Anyone using more than 5l/minute indoors is wasting what we all know is an expensive consumable.
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