So just wondering if anybody has used this machine, i'm currently running it and had a few questions if any body could answer them for me an your thoughts & views on it aswell i really enjoy using it still finding new settings to use.
Theres a few settings im not sure what there for hoping someone can help on the advanced menu i have 1)RMT-2T ???, 2)OCV-low??? 3) STUC-on ???, 4) MCAL-0A ???? cheers
Can you be more specific as the owners manual explains what each of those does very clearly IMO? Generic dynasty 350/700 manual here https://www.millerwelds.com/files/owners-manuals/O216869AH_MIL.pdf which may not be 100% accurate everywhere, the millerwelds site will let you download by machine serial number if you haven't already got one
RMT-2T is one of the momentary switch trigger parameters which can be set various different ways. The manual shows a graphical description for each of them; 'standard' is press and hold to weld, release to slope out and stop. RMT-2T is more akin to 4T in that it's press and release to weld, repeat to slope out and stop. Then there's 3T and 4T which offer more options. OCV-low lowers the open circuit voltage, STUC-on cuts the output if the stick electrode gets, well, stuck. Both are for stick welding only. MCAL-0A is for calibration along with MCAL-0V
Ahh i see Thank you I've got it now. Does any one use this for sheet aluminium just wondering what kind of setting they run it at? I've self taught myself to set it up to a certain degree meaning i was shown how to change the amps an balance & had no previous exp on Ali before hand. So as I understand it I will use the hz to make the arc more narrow & stable which is handy for fillet welds an thicker material so I can get to the route of the joint or if I'm welding near something I don't want to arc up on its good to use it then, I usually set mine at 135 hz for such occasions up to about 170 hz max. Next balance usually between 70-80%, upslope-half of amperage 100A=50A upslope same with downslope half of Amps. The upslope is something I've come up with don't know whether its right or not but it works for me an the reason upslope is there so you don't blow corners of your material when you start an to let you adjust and get comfy before you get your full amperage. Downslope is there to stop craters forming an same again on corners kinda cools the weld so you can build up instead of blowing thru. Pulse per second haven't used this much at all think I used it on some really thin stuff once using it like 1-2 pps so it kinda froze the weld after each coin so I could arc on the weld instead of the thin material, or you could use it welding over head to stop it dropping or I believe you can use it at higher pulses to cause a nice ripple effect. Does pps get used on Ali a lot or is it mainly s/steel?
Pulse is more useful on heat sensitive materials like stainless. It isn't about creating nice ripples or stacks of dimes (although some do use it mainly for that), it's about lowering the average heat input and increasing travel speeds
Things like AC frequency, AC waveforms, slope times & start/finish amperage are kinda as much about personal preference and efficiency* as anything...
As a general rule of thumb ally typically wants longer slope out times than say carbon steel but while slope out helps with regards to craters it doesn't eliminate them. Just makes it easier to not leave them. For repetitive/production work it can also be used in posher ways for example if making small widgets in a welding positioner really long slope out times can be used to compensate for a part becoming heat soaked as the weld progresses. This is why you can set slope times upto 50 secs
Initial amperage and upslope can be used a couple of ways, to get comfy and/or avoid blowing edges away OR it can be the exact opposite and used for a 'hot start'... aluminium for example has high thermal conductivity so needs more amperage initially (or slower travel speeds) and less as the part heats up. Provided you're not grovelling around the floor a foot pedal is waaaaaaay more useful as it gives infinite control of slope times and amperage
As you say higher AC frequencies constrict the arc. It also kinda lowers the heat input (everything else being equal) as lower frequencies are more efficient at putting heat into the work. Marketing blurb (and people on the internet) often gets AC frequency wrong and/or misses some of the point by getting tunnel vision on arc focus/width. While higher frequencies are useful for say a fillet on thin material AC frequency can be used to fine tune weld width/profile on fillets and outside corners
AC balance sets the ratio between DCEN (welding) and DCEP ("cleaning"). It can be set at a happyish medium and almost forgotten or it can be biased further towards EN to increase welding efficiency. Done the second way amperage and even stuff like AC frequency has an effect on how far it can biased towards EN before the weldpool gets 'manky' due to a lack of cathodic cleaning. Higher AC frequencies typically need a little more EP than lower frequencies and as amperage goes up typically need a little less EP to maintain a clean weldpool. The Dynasty 350 also offers independant amperage control of both the EN and EP phase of AC which further refines things
* being able to focus the arc better and play with the shape of the AC waveform can put more heat into the work/waste less on heating the tungsten and allow higher travel speeds, a smaller HAZ and more time in the pub as the job got done faster
cheers hotrodder very good information, i have yet to have a play with the independant en ep controls i've just stuck with the balance up to now but taking that on board i'll have a go at it. Is there any time when you would need to go over 200hz? Most i've got up to has been about 180 i was getting a nice deep small weld between 2 solid ali blocks it had detail i could not arc near it did the job an a nice one at that but just wondering if i could of gone a lot higher than that.
I can't with my kit but yeah, very high frequencies can be useful for some jobs whether it's AC frequency or pulsing at many hundreds or even thousands of Hz with DCEN on insanely thin stuff or when there are features very close to the weld that need to be avoided