Comparisons of a Couple Machines
LINCOLN PT185
Spec Sheet on PT185:
http://content.lincolnelectric.com/p...ature/e336.pdf
Rated at 185amps with a LOW 15% duty cycle. This means that if you are welding at 185 amps, you will only be able to weld 3 minutes of every 20 that it's on. In other words, you can use it for 3 mins and it will likely kick a thermal overload and take 20 mins to cool down and turn back on.
At 90 amps, it has a 100% duty cycle. Keep in mind that aluminum typically takes quite a bit more amperage than stainless or carbon steels.
Digital meters. They can come in handy at times, especially for beginners.
The PT185 says it comes with a torch that's aircooled and rated at 150amps.....which is less than the machine is rated for. I have personally owned one of these torches, and they will get too hot to hold with regular leather gloves when welding 3/16" aluminum. Not only that, but the torch handle is very brittle and will break if you drop something on it. It is thin and brittle. I know, I used to have one.
It has "Micro-start technology"...wow...big word for nothing special.
Auto-balance for AC... useless. I'd rather have manual.
Built-in pulser- It has only one function, Pulses Per Second.
"Fan As Needed" - this means that the fan only works when it needs to, saving electricity.
I have been told that as soon as you strike an ark with the Lincoln, it will turn on the fan and stay on for at least 6 minutes, reguardless of the thermal load.
Power input is only capable of single phase. Not that you need 3 phase, but that ability will make it worth more for resale.
3 Year warranty on parts and labor.
======================================
MILLER 200 DX
http://millerwelds.com/pdf/spec_sheets/AD4-8.pdf
Rated at 150 amps with 60% duty cycle (notice PT185 was very low duty cycle here), 100 amps at 100% duty cycle (lincoln hit 100% at 10 amps less). ****, they'd both probably hit 200, but the duty cycle would be lower. Notice on page 2 of the spec sheet, the amperage range does show a high of 200 amps. The duty cycle specs do not indicate maximum amperages for either machine.
Offers more user controlled variables for Pulse feature, not just Pulses per second.
Offers sequencer controls. (probably wont need then though).
Digital Meters.
Post flow, preflow
This is an inverter type machine, and has MUCH better abilities for welding of aluminum. Rather than be a set 60hx frequency, you can change it fro 50-120hz.
"Fan-on-Demand" Just like Lincoln machine, except that it will only turn on when the unit gets a thermal load justifing the need to use that electricity for the fan.
Automatically senses the voltage input and switches automatically.
only 45lbs.
Extended Balance Control range (30-90% EN) (an advantage of most inverter type machines).
$188 for water cooled torch (not including water cooler)
3yr parts and labor warranty
======================================
MILLER 180SD
Spec Sheet:
http://millerwelds.com/pdf/spec_sheets/AD4-4.pdf
Max amps at 180.
150amps at 40% duty cycle...so it stands to reason that it can probably compete well, if not beat the PT185's crappy 15% at 185 amps.
Digital Meters (won't make a better welder, but they're nice to have)
Counts welding time and arc starts (dunno why you'd need it)
No pulse option.. (falls last here, but since the PT185 has crappy pulser, it's not far behind)
Costs Down the Road/Accessories
As I've always said, Lincoln may be a little cheaper at times on the prices of the machine, but in the end, you will pay more...see below for an idea of how they screw you after you buy their products. It all adds up over the years you hope to own the machine and you will pay more for the Lincoln than you think in the long run.
Water Cooled Torch Comparison:
Lincoln = $359 for a 10foot lead
Miller = $188 for a 12foot lead
Advantage: Miller ($171 and 2 more feet long)
Water Cooler Comparison:
Lincoln = $792 with no reference to what amperage range it's rated for
Miller Coolmate3 = $590 rated up to 600 amps!!
Advantage: Miller ($202 and likely rated higher than the Lincoln.)
Foot control Comparison:
Lincoln= $277
Miller= $226
Advantage Miller ($51)
======================================
SUMMARY
The Dynasty is a clear first, but of course it costs quite a bit more. I don't think I need to explain this decision because it is so clear already. I know it costs more, but if the price is an issue, your best bet is a used machine with more power, rather than a new one that has less. The only debatable issue is which of the other two should get second place. Although the Lincoln PT185 boasts a whopping (sacrasm) 5 more amps, I think that the Miller SD by far will make up for this by having a much better duty cycle. Also, the Lincoln mas a built in pulser, but with it not having but one variable to change (pps), this is not a major issue to consider...whereas the price of optional accessories down the road is. So, in short I value the cheaper accessories and better duty cycle more than I value 5 more amps and a crappy pulser.
Rankings:
#1 Dynasty 200DX
#2 Syncrowave SD 180
#3 PT185
That said, if you want to stay around $2000, but want versatility....you may want to consider a used machine. I bought an older Syncrowave 350. You will have plenty of power with this machine. It will be quite a bit larger than the Dynasty, but it also will put out just over 400 amps at a higher duty cycle. This is no toy machine, it's professional quality...tried and tested winner in heavy industry. That's why I got one. The price is nice, and I've used them on different jobs ever since they came out new. Keep in mind that if you buy something like this, shipping my run a bit of money because it's about 600lbs. Likewise, the Sncrowave 250 and 300's are also good machines to find used, if the price is right. You really won't need pulse for hobby work, and if you do you can later buy a pulser that plugs into it. These machines will also accept the accessories listed above. All the Miller stuff is pretty universal. Where the smaller machines will boast welding 1/4" steel, the Syncrowave 350 will smoke *** on 1/2" or more...
Basically, if you're limited to $2000, I'd reccomend a used machine that will satisfy your welding needs....rather than a new one that will let you down the first time you want to weld thicker materials