From Richard Smith@21:1/5 to All on Tue Sep 14 20:54:40 2021
Hello all
Using industrial 3-phase welding machine with "Constant Voltage" and
"Pulse", with pure Ar shielding gas and 1.2mm (47thou) 5183 wire
(Al-Mg-Mn).
On Al 5083 and 6062
Finding
* 10m/min and above (>=393ipm) - always spray transfer on CV
* <10m/min - always use pulse mode
I'm finding that optimum wire-feed-speed when in spray is
* faster than you hear a rasping from the wire-burn
* slower than gives extensive sooting of the weld
There's a narrow optimum wire-feed-speed where the weld flows in
smoothly, with a smooth arc, but below some "lot of heat" state which
gives the black soot (Mg from the alloy?).
In pulse I again think of the wire-feed-speed and trust the "synergic"
controls to do everything else.
At 10m/min, right at the bottom of the spray range (?), it seems you
can't trust the synergic and you have to significantly tune the
voltage.