Pulsing Duty Cycle, Background Current

[Rotosan1980]

Ciao boys,

I'd like to know how many people here set the duty cycle of their pulsing welders.
Usually, in the machines where you can not set it, the duty cycle should be set at 50%: 50% time wleding current, 50% time back-ground current. Tell me if I'm wrong.

In which cases do you need to set a different duty cycle?

The Background current, in the machines where you can not set it, is usually very low, sometimes the lowest the machine can erogate.
Is that a good default set or you usually use some other parameters?

In which cases do you need to a have a hight background current?

Thank you very much for your help.

Ciao Gian...

 

[pedrobedro]

The background should not be set long or low enough for the weld puddle to set. What does erogate mean ?

 

[Rotosan1980]

What does erogate mean ?

Maybe nothing... I thought it was an english word

I want to mean the current that the machine can "give out", "supply" , the minimum welding current

Ciao Gian...

 

[pedrobedro]

Sorry to embarrass, I didn't know it was a word and it is, so it's my fault and I'm supposed to speak the language I can set the pulse on my welder too low so it has to start the puddle again which is a bad thing but on thin metal it can help to prevent burn through and actually speed up progress.

 

[old rollei]

Pulse settings . A guide pulse rate .7sec on/.7sec off equal mark space ratio.
pulse current base = !/2 the height of weld current,ie., 25amps--50amps this is for hand welding. Auto set up can be faster mark space with IB--IP to control penetration. Total heat input depending on material thickness and type.

 

[Rotosan1980]

Auto set up can be faster mark space with IB--IP to control penetration.

What does "IB--IP" mean?

Thanks
Ciao Gian...

 

[old rollei]

Ip ib

IP is the current height I= amps, P pulse time IB = base current / time.
Pulse current gives more control over the weld process ( pool control). it is perfect for welding Aluminium. (AC current)

IP
___ ___ ___ ___
___ ___ ___ time > OK?
IB
Regards J Cook

 

[geoffno6]

Sorry to gatecrash a thread but my question fits in. Just acquired a Miller maxstar 300DX which is working superbly. Im welding 1 to 2mm 304 stainless mostly without filler rod and using 1,0mm or 1,6mm ceriated tungstens. The pulse seems to work well. Anyone got a suggestion of a good setting for the pulse>

 

[geoffno6]

PS I normally erogate a peak current of 40 - 60 amps :-)

 

[pedrobedro]

PS I normally erogate a peak current of 40 - 60 amps :-)

But do you ever vacillate towards a lower base setting

 

[Shox Dr]

I bookmarked this a while ago. never used it so can't say if it works.

Pulse setup

 

[hotrodder]

I use that calculator to get the peak and background (from the amperage i would run without pulse) starting points. Pulse frequency is related to travel speed and easier/quicker to set with some offcuts, looking for 70-80% overlap to prevent crater defects

Welding with filler then you really need at least 50% pulse width/duty cycle to give enough time to add wire to the pool. For autogenous work there's often benefits to running more radical settings, less peak pulse width with higher peak currents and a longer, lower amperage background.

 

[geoffno6]

Thx Doc, i'll give the pulse spreadsheet a go, i'll have a play with the overlap on some scrap. My filler rod work is still pretty rough with a big dollop going in then running the pool along to spread it out. I think i need to have a few days just practising cos im sory of set in my ways and tend to do what I know works rather than risk trashing a job to find a better way.