Twin pulse, aluminium

[Hitch]

Okay, a bit of a shot in the dark, perhaps Matt might be able to enlighten me...


Machine is a Hitachi 350, Twin pulse

Trying to set up to weld the inside joints of 8mm thick aluminium angle, so a butt weld and a fillet.

Gas is Alumaxx, wire is 1.2, 4043.
Its got a new torch with low friction liner.


Seem to be having an issue with the setup. You can clearly hear the difference between the two pulse levels, but the weld is far from attractive. Unfortunatly no pics of the 'welds' It lacks a nice smooth bead, and that nice effect we should have from such a machine.
Anyway, any ideas on parameters for this?!

Heres a pic of the control panel. The machine pictured has identical controls, except where the spot timer is, ours has the pulse mode switch, and dial on left is labeled 'double pulse' marked in seconds 0-3.


Normaly the 2 controls on the remote are all you need to touch in single pulse mode. I assume you would set that up as normal, then set the timer, but what controls the difference between the pulses, is that the base voltage, and pulse voltage knobs?

Thanks for any help!

 

[matt1978]

Hi Mate,

I havn't seen a front panel like that before.

I think it must be very difficult to get good results without training from the manufacturer.

Things like the Pulse Voltage and Base Voltage are maybe the differential from the main welding setting, to give you your high and low current. I have no idea why its as a voltage though, we and evryone else I know use wirefeed speed (current) to set the differential. (100 amps main welding current, then you could have 30% more and 30% less for example to set the peak and background current, like on tig)

However, yours looks like its Voltage so use the Pulse voltage to go +2 and the Base Voltage on -2 and see how that works.

Arc Spot looks like some kind way of setting the Frequency of how many times it goes from the Pulse Voltage to the Base Voltage and inturn adjusting howclose the herring bones will be.

 

[Hitch]

Our panel looks like this Matt, that one above is from a single pulse unit.

The double pulse selector in place of the spot timer.

 

[Hitch]

A bit of knob twidling is in order then it seems