"Jim Wilkins" <
muratlanne@gmail.com> writes:
"Richard Smith" wrote in message news:lybl6w2odi.fsf@richards-air-2.home...
Hi again
Al-GMAW
Some say - straight run
Others say - weave or "whip"
You say??
Rich S
--------------------
https://www.mig-welding.co.uk/forum/
Latest - running smoothly
5083 Al plate 6mm thickness
5356 GMAW wire 1.2mm (47thou") diameter
in spray at
9.8m/min
(385"/min)
and about 22.8V reported.
Smooth run, no manipulation.
Looks good. Is good?
Only remaining problem is the restarts. Often burn-back to the torch
/ contactor tip. Blob of Al against contactor tip which prizes off
without harm if quick off the trigger.
Not yet worked out how to avoid that.
If I could solve that, I'd be doing rather well.
No other problems remaining
I'm left totally puzzled why Pulse is used on this 6mm thickness when
you'd be a "clean" spray anyway...
In spray doing overhead - 4F/PD - no metal ejection, not getting
burned.
Basis to insist on CV spray, as getting covered in burns using Pulse,
which was ejecting a drop of spatter per pulse.
Now finding every other position good.
I was worried the weld beads are too smooth suggesting excessive heat
input - but
- am on only about 210A to 220A (Linc.Elec. A for 9.8m/min with
1.2mm-dia wire) at just under 23V - low-end of L.E. volts range.
- any drop in V by a tiny amount or wire-feed-speed / Amps causes a
coarse unwetted bead and raspy arc - only just in spray
indicate the concern is misplaced - the beads are smooth and that is
the way it is not problem (the reference state being Pulse welded bead appearance)
Rich S
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