On the V/I and duty cycle curves of the HH210 vs HH175

[kenc]

Comparing the V/I and duty cycle curves for the HH210 and the HH175, I am surprised to see that the duty cycle curves pretty much lay on top of each other until the hh175 runs out of poop at 17% st 175a. The HH210 maybe has 22% at 175 and tapers off to about 16% at 210a

The V/I curves, show a loaded voltage output of 20v at 175amps for the HH175 on range 4, and the HH210 shows maybe 22v at 175amps on range 7, going down to 20v at 210 amps.

Is a 2v difference at the same current level THAT noticeable?

Having just taken the plunge on an HH210 today, I guess I was expecting a bigger difference from the curves.
I realize that enough of you have said that this is a substantially better unit on 1/4" steel in practice than the HH175 that the curves don't matter.

Strange though

[Dan]

Ken,

At the same amperage 2 volts + or - is a major difference.

Also, the 21 -22+ volts @200+ amps that the HH 210 outputs in the real work is a significant increase in output power over what your 175 gives you

Besides the extra out put power, the other area that makes the HH 187 or HH 210 a better 1/4" unit then the HH 175 , is the fact that the 187 and 210 produce a better inductance level. Which translates into a less harsh arc, better weld puddle wetout, and a lower spatter level. Of course this is assuming that you have the arc dial in properly.

The duty cycle on these units is established at a work enviroment temp of 104º F, so at temps lower then this your duty cycle is actually higher .

I've ran over a dozen 4" long weld beads on 1/4", in a fairlty short time frame, with the HH 210 that I have, and the air exiting the unit was still cool. At the time, I had the unit set to tap #6.

[kenc]

Dan,
Thanks for the clarification.

I spent a couple hours figuring out if I really wanted to spend the money on what looked like a fairly nominal upgrade, but I think I'll be glad I did.

My wife may not even notice that I have a new welder since the hh175 and hh210 are virtual clones in appearance Ah, if only......

One other conundrum.
Looking over the "welding guide" for the hh210 for C25 I notice that the jump in tap setting for 18ga steel between 023 and 030 wire is large, but 030 and 035 are identical 4/50, vs 2/25 and 2/25. Yet moving to 14ga and above, the difference is way less severe. However 22ga shows 023 and 030 virtually identical
I know that these are merely starting points, but still they seem inconsistent.
Is there a typo?

Here's another strange one:
1/4" steel is setting 5/50 for 030, but 6/45 for 035? Why would the heavier wire gauge use a higher tap setting and about the same wire speed? Inconsistent with all the other gauges where 035 is the same tap but lower wirespeed.

ken

[Dan]

Ken,

Those door chart settings are strictly a Hobart employees opinion.

Unless I am field testing a unit, I pretty much ignore the chart , and just set the machine by running test welds on scrap.

Also depending on the joint design or the position of the weld, on 1/4" you could end up using tap 5 or 6, possibly even tap 4 too.

[Sberry]

I figured the 210 was 15% better on the top end than my SP