Sooooooooo, I have had this machine for a few months now and have been ****ing around with the settings on AC to see what all the hype was regarding the variable polarity feature. I have decided that I really like the VP capability but I would also like to stress that by no means is it necessary to successfully tig weld aluminum. I think Miller actually dropped the ball BIG TIME by doing away with the Dynasty 300. They may have something else in store but as it sits, there is a huge gap in their inverter tig lineup between the D200DX and the D350DX.
For those not in the know, the Dynasty 350 has 50 more amps and a few more bells and whistles. The real improvement was supposed to be on the AC side where you could independently set the amperage values for each half of the electrode positive and electrode negative cycles. The values can, according to Miller, be set to "provide enough cleaning while putting more amperage into the part". It is also supposed to give better penetration and faster travel speed. Tungsten life is also supposed to be better using more EN amperage.
This is a tool holder I made for my lathe this afternoon. I used the VP feature on the 350 to make these welds. The settings were as follows:
Machine set at 250 amps
EN Amperage = 268
EP Amperage = 143
Balance = 75
Frequency = 120
3/32" blue tungsten using a gas lense and #7 cup
The material was 1/4" 6061 and the filler was 1/16" 5356. The ratio of EN to EP was 2 to 1. What you do is set your EN amperage to 200 and your EP amperage to 100. Then, set the welding amps to whatever you want and it will maintain that 2 to 1 ratio. The 2 to 1 ratio is also just a recommended starting point. You can basically set the thing to any ratio you want for any given welding task. The balance setting will also have an effect on the "average" that the welding amps end up at.
The first thing noticable was that the puddle formation on the 1/4" material was almost instantaneous. It took maybe 3 seconds before I was ready to add filler and then it was just "get after it". The etched cleaning zone was also substantially smaller than it would have been on the 300 with the same settings, sans polarity adjustment. The really remarkable effect was the lack of tungsten degradation. I welded 6 two inch long beads and the tungsten looked like I had just sharpened it. That would never have been the case if I were using the 300DX or a conventional machine. I pretty much had the pedal maxed, or slightly less, for this project.
The pics are as follows:
1. The toolholder I was making. there are 3 two inch long welds on the top and the bottom.
2. Weld close-up. The wet in at the toes on these settings was awesome.
3. Another close-up of a different weld at a different angle.
4. Tungsten close-up after the 6 welds.
5. Same as #4.
I have more work and testing to do but my preliminary results are super positive. If you have any questions, I will do my best to try and answer them.
Results 1 to 10 of 52
11-09-2007, 10:18 PM #1
Dynasty 350 DX: Variable Polarity
11-10-2007, 08:44 AM #2Senior Member
- Join Date
- May 2007
Nice work Kb, thanks for the technical info.
11-10-2007, 09:05 AM #3Senior Member
- Join Date
- Oct 2006
Faster travel speeds? Faster than what? Faster than a slower operator on another machine?
In short, I agree with you 100%. Miller made poor decisions having to do with the 300 and 350 machines. I can only hope that they realize the mistake and make appropriate changes in next years' offerings. The company I work for will be buying more machines soon, and I simply don't feel strongly about the options Miller has provided this year.
11-10-2007, 09:33 AM #4
11-10-2007, 10:28 AM #5Senior Member
- Join Date
- Mar 2007
- Deltaville, VA
Wow. I feel vindicated.
A while back I started a thread about how I thought Miller had created a huge gap in the product line with the Dynasty 300 being replaced with the Dynasty 350 and nothing between 200 and 350A.
Now KB and Engloid, two of the best tig welders around, and true professionals in their trade, have both come out and expressed belief that Miller has, in fact, made a marketing fubar. We can only hope that Miller's market research dept. may read these boards.
Miller has always been extremely good at "covering the marketplace". If one looks at the MIG lineup, they're well covered all the way from the 140A hobbiest units to the large industrial equipment. Same thing for SMAW.
In the transformer TIG arena we have the Syncrowave 200, 250 (actually a 300A unit), and the 350. The only problem here is that they are power hogs and lack many features available on the newer inverter based machines.
The Dynasty 200, while a great machine for what it is, is a little light in HP and duty cycle, for those former Sync 250 owners to move to inverter machines. The Dynasty 350, while a great machine, is priced out of reach for many and has "bells and whistles" which will never be used by most.
It would seem that there would be a huge customer base (former Sync 250 and Dynasty 200 owners) who would be prime prospects for a Dynasty 250/275 which had the features of the 200 and a little more power.
Anyone from Miller listening?
Just my .02.
PS Thanks KB for your evaluation of the Dynasty 350. Very informative and well written (as always). If anyone can take advantage of all the "bells and whistles", it will be you.Syncrowave 250 DX Tigrunner
Dynasty 200 DX
Miller XMT 304 w/714D Feeder & Optima Control
Miller MM 251 w/Q300 & 30A SG
Dialarc 250 AC/DC
Hypertherm PM 600 & 1250
Wilton 7"x12" bandsaw
PC Dry Cut Saw, Dewalt Chop Saw
Milwaukee 8" Metal Cut Saw, Milwaukee Portaband.
Thermco and Smith (2) Gas Mixers
More grinders than hands
11-10-2007, 10:33 AM #6Senior Member
- Join Date
- Oct 2006
I really think that a slip up like this is all Lincoln needs to pull a lot of customers away from Miller. If Lincoln now steps up their customer support, they will find it easier to take away those customers...and keep them.
Perhaps Miller will recognize this and put out something to fill that gap ASAP...even if it means a mid-year addition to their lineup. ..or bringing back the Dynasty 300.
11-10-2007, 11:24 AM #7Junior Member
- Join Date
- Apr 2004
I've been a member for awhile now but just lurk the forum, I couldn't resist responding to this though. I also think that Miller has made a mistake by leaving such a gap between the 200 and 350. I'm in the market for another machine, and buying another 350 is too much. The 200 is a tad shy on amps. I think Miller should come out with a 275. I personally think a 275 would be an awesome machine. Not to big, not to small.
just my 2 cents- Jeff
11-11-2007, 11:35 AM #8Senior Member
- Join Date
- Jun 2007
I also agree the 200 to 350 machine jump is a ridiculous gap for the inverter family and I don't understand Miller's reasonings. I am not afraid to weld with any quality machine, I could care less if it is or is not a Miller.
11-11-2007, 03:21 PM #9
Me either...but....I chose to spend MY MONEY on Miller
To be honest I am seting my sites more towards the 700 now....seems like a better deal for my shop and I am sorta looking at a used one even tho now it is a bit out of my reach.
As far as secrets go if Miller doesn't invent a new portable mig I'll be working on getting a new HH210 from Hobart. Be nice if they'd let us in on those plans as well. A mig twin to my Dynasty would be perfect!! (both voltage wise and appearance)
Miller Dynasty 700...OH YEA BABY!!
MM 350P...PULSE SPRAYIN' MONSTER
Miller Dynasty 280 with AC independent expansion card
Miller Dynasty 200 DX "Blue Lightning"
Miller Bobcat 225 NT (what I began my present Biz with!)
Miller 30-A Spoolgun
Miller Spectrum 300
Miller 225 Thunderbolt (my first machine bought new 1980)
Miller Digital Elite Titanium 9400
11-11-2007, 09:08 PM #10Senior Member
- Join Date
- Nov 2007
ITW is pretty smart. Whether Miller or Hobart, they aren't going to announce to the world--competitors as well as users, that they have a new machine ready to debut. Think about it, how many users of Miller are there compared to maybe a couple hundred who read this board. I woudn't divulge my development plans either. While it looks as if there is a gap in their product line-up now, you have to realize they don't redevelop an entire product line from 150-700amps within a single year. They've made their high-end machines one year and the 150 another year. I'm sure they are working on a refresh to the 200, and if it is like other mature products, they will be sweetening the design either with new features, increased amperage, or both. Remember the XMT-304 that became the XMT-350? The syncrowave 180 that became the 200? ITW reads this board, so they've seen the comments--don't worry.
Miller does have inverter-based Migs--the Passport and the MM-350. I'm sure in the future there will be more models to fill out the line-up since these models have already proven themselves to be so successful.