Ctwd effects on welds.

[thunder85]

Just visited the tregaskiss' website about stickout and there was an affirmation, ("As the wire stickout increases, voltage increases and amperage decreases. When this occurs, the arc may destabilize and wander")which I'm not sure is true. I thought that the CV power source self regulated the voltage " arc length". I know that the amperage decrease from the wire resistance but that the voltage increase, I'm not sure. So what's the truth?

[albrightree]

"As the wire stickout increases, voltage increases and amperage decreases. When this occurs, the arc may destabilize and wander" , Have you gotten results that are contrary to this statement ?

CV welding sources aren't regulated power supplies, especially tapped transformer mig welders. The voltage will be dependent on wire speed , wire size, material , gas , and ctwd. Inverter machines tend to hold the voltage a little more constant. CTWD can often be used on older tapped transformer machines to manipulate the arc, and puddle (within certain limits).

What welder are you using now ? Many often give you voltage read out while welding.

What was the page you were reading on the tregaskiss site ? Would like to read it.

[Oscar]

What they meant to say was that the voltage drop increases, meaning there is more voltage loss in the extended wire length due to resistive heating. So the voltage drop in the entire circuit is the same, just that now there is less voltage left over at the arc because it is being dropped/consumed within the wire that is now longer than it should be.

[thunder85]

Here is the link albrightree :https://www.tregaskiss.com/correct-c...%20application.

[albrightree]

Thanks, good article on contact tip recess. Its an often overlooked parameter.

[thunder85]

I'm welding with a Miller 450xt inverter with metal cored wire. As I angle the gun lower in the direction of travel the arc sound more like spray and when I get it straighter it's spray again but with alot more intermittent short-circuits. So as I angle the gun more shallow like I get longer stickout but apparently a slightly longer arc length. I don't understand it, I thought I would get slightly lower voltage (arc length) not the opposite. I thought like Oscar, longer stickout= for sure less amperage and a little less voltage. How this situation seems to be in accord with the tregaskiss' statement?

[OPUS FERRO]

thunder85

. . . .I'm not sure. So what's the truth?

I thank everyone - for their focus on electrical theory - I now
understand the physics behind Hard-Wire welding . . .

Open ? - What is the applied [gun in hand] benefit/technique
of said theory . . . ?

There is one answer - known to Wire-Blasters . . .


Opus



.

[Oscar]

I'm welding with a Miller 450xt inverter with metal cored wire. As I angle the gun lower in the direction of travel the arc sound more like spray and when I get it straighter it's spray again but with alot more intermittent short-circuits. So as I angle the gun more shallow like I get longer stickout but apparently a slightly longer arc length. I don't understand it, I thought I would get slightly lower voltage (arc length) not the opposite. I thought like Oscar, longer stickout= for sure less amperage and a little less voltage. How this situation seems to be in accord with the tregaskiss' statement?

metal core is a different animal altogether that necessitates a longer stickout since it is usually meant for spray-transfer. Kinda the same thing with gas shielded flux-core. It needs longer stickout in the first place; 5/8" to 1" depending on wire diameter.

[thunder85]

metal core is a different animal altogether that necessitates a longer stickout since it is usually meant for spray-transfer. Kinda the same thing with gas shielded flux-core. It needs longer stickout in the first place; 5/8" to 1" depending on wire diameter.

Thanks Oscar.