Spray Arc ?

[yammahoppy]

can someone please either explain the SPRAY ARC and short arc welding techniques or post a decent web site so i can understans what the heck yall ae talking about


JASON

[dulknife]

to shay

i would also like to know

[Paychk]

Spray Arc and short arc are vary similar, both use wire and a shield gas to transfer molten metal to the parent materials to join them.

Short arc the wire touches the parent material and shorts out, then melts the wire, breaking the arc and leaving the filler in the puddle. This happens so quickly the human eye can't see it happening, but slow motion pictures will.

Spray arc the filler vaporizes before it touches the metal and sprays to the parent material. Hence the term sprayarc, this process must use a shield gas mixture of argon or argon/oxy mix. This process can’t happen in a CO2 environment so that gas is only used for short arc process.

Spray arc is more expensive than short arc because of the amount of power (size of welder) and the sheild gas requirements, but the advantage is the speed and percent of deposition of the filler material. I don't have numbers but it is very fast compared to short arc and has very little cleanup because there is little to no splatter.

[Seldom]

You might find something that you're looking for at weldreality.com and click on the mig tab to te lets side of he screen..

[chip hayden]

you really need a 220volt power supply capable of about 23 volts, 200 amps, 400inches per minute wire speed [it can be done with less but i have never done it with a 110volt machine]. you also need a high concentration of argon for the small metal droplet formation[i.e. spray].
as you spray transfer, the weld wire comes out the contact tip and looks just like paint coming out of an aerosol can. the sound is the dead giveaway though: pop pop sizzle sizzle for short circuit transfer---WHOOOOOOOSSSSSSHHH for spray!

[Big Nate]

[Guest]

Spray arc

You can do a search in this forum on 'spray arc' and get lots of info...however the job I did last year was not there...so I'll post it here so you can see the capabilities of spray arc.

The machine is a Miller CP300, 1/16" e70S-6 wire, 98/2 argon/CO2, 325 amps 28 volts.

This weldment is 7 tons.

[Guest]

This is the start of it.

[Guest]

The material is hot rolled steel, 2" and 5 1/2" thick.

[Guest]

Because spray arc is so fluid, it is best to weld the fillets at a 45 degree angle.

This weld is one pass 1 1/4"wide, done by hand.

[Guest]

This is the positioner I built to hold it.

[Guest]

At one point, I experimented with a machine tractor. I got burned, so I gave it up...however it did do a fair job.

[Guest]

...a closer look

[Guest]

...and closer

[Guest]

and here's the welds it produced....notice the cold lap there? no problem with 325 amps...it gets picked up in the next pass.