Thread: Spray Transfer??

Hi all

I'm new here so g'day.

I recently got a mig - well 2 days ago and have found the stuff on this forum fantastic - I know that if I hang around too long a lathe and mill will find there way into the shed.

Anyway the question - I see plenty of discussion about short circuit arc and spray transfer arc - mountains of it even down to the point that you need argon/blends to do spray transfer, the nose it makes and when its good etc.

However for a novice how the heck do you initiate welds with the two kinds of arc? I only picked up a bottle of argoshield light this afternoon and had a quick test and seem to be getting more of a hiss noise rather than the sizzling bacon.

If it matter the welder is a MIGOMAG 220 with .9mm wire.

Hi and welcome Craig,
Spray transfer is just a mode of arc deposition.It's a function of the variable wire speed and volt settings on your machine.

At lower volts (heat ) and wire speed ( amps & penetration ) the arc pool can fill gaps,weld on some sheet thicknesses and perform out of position welding (Vertical and overhead ).
This happens cos the arc is smaller in volume and running cooler.

At the higher end of the volt (heat ) and wire speed ( amps combined& penetration ) scale the arc pool is very hot and of increased volume.

This big hot sloppy arc pool is suitable for flat and horizontal vertical- (that is combined flat & vertical position ) Only.It works well for heavy fill situations and gives good penetration into the parent metal.

The hiss would indicate that you probably were in or close the Spray mode of arc deposition. 22 /23 volts would be close.

Does that explain it well enough for you?

Grahame

Thanks Grahame

I guess since I was at the lower end of line speed then I was close to spray transfer?

Does the use of argoshield light affect this over universal?

MGAW seems a bit of a minefield at times and if I wasn't working an extremely variable roster I would be lining up for a TAFE course, instead it will be suck it and see.

Craig,
You may want to have a look at these sites.They may offer more info without the need for tafe.

http://www.millerwelds.com/pdf/mig_handbook.pdf

http://www.esabna.com/EUWeb/MIG_handbook/592mig1_1.htm

The shielding gas in itself is a variable as the Co2 and oxygen percentages are tailored to give a specific result.

I won't comment too much further as the Argoshield designations of the (BOC was CIG ) gas has changed over the last several years.I was used to know what specific gas does what, but not any more.
The above reading should tell you most of what you need to know.It is part of those companies educational offering and they both can be printed out to use while practicing.
What evr you can't get your head around ,we can sort out here in the forum.

Cheers
Grahame