tip recess?

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Subject Author Date
tip recess? Grant Erwin 06-27-2008
Posted by Grant Erwin on June 27, 2008, 5:02 pm
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 I never have fully understood why you sometimes want a nozzle that has
the tip recessed, sometimes you want the nozzle that's flush with the tip,
and sometimes you want the nozzle with the tip extended. Can someone please
enlighten me?

Grant

Posted by Maxwell on June 27, 2008, 5:37 pm
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>I never have fully understood why you sometimes want a nozzle that has
> the tip recessed, sometimes you want the nozzle that's flush with the tip,
> and sometimes you want the nozzle with the tip extended. Can someone
> please
> enlighten me?
>
> Grant

There are probably other reasons, but mine depend on what I am welding.

Welding the outside of a 90 degree corner, I would extend the nozzle to
almost touch the material, while maintaining a wider gap to the contact
tube.

Welding the inside of a 90 degree corner, I would retract the nozzle to
extend the contact tube closer to the weld.

Welding a flat plate, I would set the contact tube about flush with the
nozzle.

It's all about keeping the shielding as close to the weld as possible, while
maintaining about the same (proper) distance between the weld arc and the
end of the contact tube.




Posted by SteveB on June 27, 2008, 9:08 pm
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>I never have fully understood why you sometimes want a nozzle that has
> the tip recessed, sometimes you want the nozzle that's flush with the tip,
> and sometimes you want the nozzle with the tip extended. Can someone
> please
> enlighten me?
>
> Grant

It's called "stickout". As eloquently described by Maxwell, there are joint
configurations where you want it to stick out or stick in.

Too much stickout can cause air infiltration and resultant porosity. Or you
just lose that nice spray across the arc. Too short, and you overheat the
tip, or the cup drags.

It is difficult, though, to have one cup fits all philosophy, though, as it
doesn't. But unless one is welding only one type of joint all the time, it
is ineffective to be changing tips every few minutes or sooner.

Tis best to find a tip that works under most conditions, or a position that
allow for workable stickout.

Steve



Posted by Ernie Leimkuhler on June 27, 2008, 11:22 pm
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> I never have fully understood why you sometimes want a nozzle that has
> the tip recessed, sometimes you want the nozzle that's flush with the tip,
> and sometimes you want the nozzle with the tip extended. Can someone please
> enlighten me?
>
> Grant

There are considerations of joint design, but the main consideration is
heat.
When welding at low amps on thin metal (short circuit) you want to keep
the wire stick-out short so you want the tip a little proud of the cup.
For higher amperage welding (as in Spray mode) you want the tip flush
with the tip and for high amperage spray welding you want the tip
recessed or you will burn it off.


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