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Tungsten after welding out the front triangles. Now granted, this isn't a ton of welding. But I think it help up amazingly well.
1/16" 2% lanthanated after welding by Zanconato Custom Cycles, on Flickr
Seat cluster by Zanconato Custom Cycles, on Flickr
Bottom bracket by Zanconato Custom Cycles, on Flickr
Head tube by Zanconato Custom Cycles, on Flickr
For reference, the head tube is 2" OD x 0.145" wall. The threaded bottom bracket shell is 1.75" OD by 0.160" wall. The three main tubes vary between 0.052" and 0.074" wall. Material is 7005 aluminum. Filler was 5183.
If you've made it this far, I hope you found the info useful. I'm going to keep experimenting with wave shape and I'll put up more info if people are interested.
I keep coming back to what Dave Powelson has typed quite a few times. There are an infinite number of ways to set up these inverters. I'll add to not get boxed in by the recommendations. Experiment a lot!
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I've been doing some experimenting on my machine and wanted to share my findings in hopes that it might help some others. When I was in the process of deciding between the Dynasty 350 and Dynasty 280DX, one of the things that kept me coming back to the 350 was independently adjustable EN and EP amperage in AC. The 350 was a real reach for me financially though. When I heard that Miller was going to put out an expansion for the 280DX that implemented this feature, I decided to go with the 280DX and wait it out for the expansion.
First, a quick overview of what this feature actually is. Most weldors are familiar with balance and frequency adjustment. Balance is the percentage of time that the machine is on the EN or EP side of the wave during each cycle. Frequency is the number of cycles per second that the machine is cycling. So if you are running 75% EN balance and 120 Hz, the machine is spending 75% of the the time on the electrode negative side of the cycle and 25% of the time on the electrode positive side of the cycle and it's switching 120 times per second. By introducing independently adjustable EN and EP amperage, you can dial in the amps on each side of the wave. For instance, you might run 125 amps on the EN side and 100 amps on the EP side. The common approach and what most of the machine manufacturers recommend is running higher EN amps than EP amps to put more heat into the part for deeper penetration and less heat coming back into the tungsten.
When I got the expansion for my machine, I started off by going with Miller's suggestion. I started off with a ratio of 1.5/1.0 EN/EP. In other words, the EN amperage was 1.5 times greater than the EP amperage. The results were not what I was expecting or hoping for. I found I had to turn my balance down to get enough cleaning and that resulted in more tungsten degradation than I was used to (I was running a 3/32" 2% lanthanated). It got me thinking about what is actually going on during the EP cycle and what is really doing the cleaning. Did it have more to do with the amperage or the % balance? I started experimenting with running the EP amperage higher than the EN amperage to understand if it improved cleaning. I was really surprised to find that for my application, the amperage on the EP cycle played a more significant role in cleaning than the time (balance did). I started pushing the limits a bit, and went as high as a 1.0/1.5 EN/EP ratio and a balance of 8590% EN. Yes, the EP amps were 1.5 times greater than the EN amps. I was able to go down to a 1/16" 2% lanthanated electrode ground to a sharp point. The resulting control was really shocking. It's been as close to feeling like running DC on steel as I've been able to dial in yet. I also found my restarts looked a little nicer and the etching zone was narrower and more faint. In my business, weld aesthetics sells. It really matters. I'm really happy with how the finished product is looking.
Here, I have my EP amps set at 280 amps and my EN amps set at 195 amps. Wave shape was advanced square wave for both EN and EP. My balance was set at 8085% EN depending on the joint. Welding the sides of the tube goes a little nicer with a bit more cleaning compared to the deeper angles. Frequency was 250 Hz. Running a CK20 torch with a gas lens and #8 cup running at 18 CFH.
Here's the initial prep on the tungsten.
1/16" 2% lanthanated initial prep by Zanconato Custom Cycles, on Flickr
Here's the tungsten after tacking the two front triangles.
1/16" 2% lanthanated after tacking by Zanconato Custom Cycles, on Flickr
Tacked triangles.
tacked by Zanconato Custom Cycles, on Flickr
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Hi all,
I've had my 280DX for a couple of weeks now and figured I'd share some of my settings. I build bicycle frames, so most everything I'm welding involves tubing. I have been loving the adjustability of the Dynasty. The control truly is remarkable.
The first few photos and settings are on the AC side. The tubing I'm using is 7005 and filler is 5183. The tubing seems to like the balance turned down a bit for a little extra cleaning. I'm running at 6570% depending on the joint configuration. For frequency, I've settled in around 150 Hz. This seems to allow the toes to wet in really nice but still drive down into the root of the joint. I can always see metal flowing into the root. I have also settled into the soft squarewave for the most part. I like how the tri wave wets on the thin stuff, but I find it a little squirrely. The advanced squarewave seemed to bite in a little harder than I was used to. The Soft square feels really nice.
The head tube and threaded shell on this frame are 0.150" wall and the tubes range in thickness from 0.050"  0.080". 3/32" DGP TriMix tungsten, gas lens, #7 cup, 15 CFH. Machine set to 200 amps and controlled with the pedal.
Aluminum cyclocross by Zanconato Custom Cycles, on Flickr
Aluminum cyclocross by Zanconato Custom Cycles, on Flickr
I also have been using the high speed pulse on DC and really like it. I really like how it gives a nice flat bead, toes that are washed in very nice, and a lot of control on tube edges. I was running 250 PPS, 40% peak time, and 25% background current on these.
Todd P by Zanconato Custom Cycles, on Flickr
Todd P by Zanconato Custom Cycles, on Flickr
Anyway, I figured I'd pass along some of my settings in case it could help anybody out. Have fun!
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A/C Pulse
Can anyone think of a reason I cannot get A/C Pulse to work with my Dynasty 200DX... I've tried about everything I can think of.
I have tried many settings:
PPS: from .1  60
PEAK t: from 5  75
BKGND A: from 5%  50%
(YES, the pulser light is on)
Pulse does work on D/C
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Originally posted by OscarJr View Postmathematically, the syntax is correct (with the exception of the word "and", should have been "of", which mathematically just means "times"). If you change it all to decimal it becomes:
Both are equivalent by way of algebraic manipulation of common factors.
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Originally posted by OscarJr View Postmathematically, the syntax is correct (with the exception of the word "and", should have been "of", which mathematically just means "times"). If you change it all to decimal it becomes:
(0.90*34 + 0.10*17)/1 = 32.3 (because 100% in decimal = 1)
Notice how if you end up dividing be "1", it has no net effect. Anything divided by 1 results in the original quantity. The "percentage conversion" was already done without having to divide because to use percentages is to use decimal equivalents. What he [probably] meant to say was:
(90*34 + 10*17)/100= 32.3 (same thing he wrote, just use your mind's eye to "remove" the percentage symbols)
Both are equivalent by way of algebraic manipulation of common factors.Last edited by Weldhelp; 07012014, 05:38 AM.
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Originally posted by Weldhelp View PostThat's funny. I seem to get to those numbers using this formula:
60(Main amps) x 50%(Peak T) + 60(Main amps) x 50%(background) x 50% (remaining time from peak t percentage) = 45 average amps
34(Main amps) x 90%(Peak T) + 34(Main amps) x 50%(background) x 10% (remaining time from peak t percentage) = 32.3 average amps
Using this formula below from "4sfed" didn't seem to work unless i was doing something wrong.
"To calculate average current it's: (90% times 34 amps + 10% and 17 amps) divided by 100%".
(0.90*34 + 0.10*17)/1 = 32.3 (because 100% in decimal = 1)
Notice how if you end up dividing be "1", it has no net effect. Anything divided by 1 results in the original quantity. The "percentage conversion" was already done without having to divide because to use percentages is to use decimal equivalents. What he [probably] meant to say was:
(90*34 + 10*17)/100= 32.3 (same thing he wrote, just use your mind's eye to "remove" the percentage symbols)
Both are equivalent by way of algebraic manipulation of common factors.
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Originally posted by popspipes View PostJust for grins I set up the machine to the stated figures and the first read 45 amps the second set of figures was 33 amps.
I was just curious as to how close the readout really was......
60(Main amps) x 50%(Peak T) + 60(Main amps) x 50%(background) x 50% (remaining time from peak t percentage) = 45 average amps
34(Main amps) x 90%(Peak T) + 34(Main amps) x 50%(background) x 10% (remaining time from peak t percentage) = 32.3 average amps
Using this formula below from "4sfed" didn't seem to work unless i was doing something wrong.
"To calculate average current it's: (90% times 34 amps + 10% and 17 amps) divided by 100%".
Last edited by Weldhelp; 06242014, 07:28 AM.
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Originally posted by Weldhelp View PostI appreciate the help. Although, I'm a bit confused. Regarding your average, where are you getting the 10%. In both "1" and "2" the background pertentage is the same. Based on the average you've calculated, are you saying that the background amps is determine by the difference in the "Peak" amp percentage time the "background" amp percentage which in the #2 scenario would be: 100%  90% = 10% x 34 amps x 50% = 1.9 background amps????
Then 34 amps x 90% = 30.6 peak amps
30.6 peak amps + 1.9 background amps = 32.5 average amps
is that how you're calculating back ground amps?
I was just curious as to how close the readout really was......
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Originally posted by 4sfed View PostI think you're confused about the terms. "Peak" refers to the percentage of time at peak current. In #1 that is 60 amps for 50% of the pulse. "Background" is the percentage of peak amps. So in #1, it's 60 amps for 50% of the pulse, then 30 amps (50% of 60 amps) for the remaining 50% of the pulse.
In #2 it's 34 amps for 90% of the pulse, then 17 amps (50% of 34 amps) for the remaining 10% of the pulse.
If you were to change the pulse frequency to 1 PPS, the #2 would be 34 amps for 0.9 seconds followed by 17 amps for 0.1 seconds . . .
To calculate average current it's: (90% times 34 amps + 10% and 17 amps) divided by 100%.
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Originally posted by Weldhelp View PostI appreciate the help. Although, I'm a bit confused. Regarding your average, where are you getting the 10%. In both "1" and "2" the background pertentage is the same. Based on the average you've calculated, are you saying that the background amps is determine by the difference in the "Peak" amp percentage time the "background" amp percentage which in the #2 scenario would be: 100%  90% = 10% x 34 amps x 50% = 1.9 background amps????
Then 34 amps x 90% = 30.6 peak amps
30.6 peak amps + 1.9 background amps = 32.5 average amps
is that how you're calculating back ground amps?
In #2 it's 34 amps for 90% of the pulse, then 17 amps (50% of 34 amps) for the remaining 10% of the pulse.
If you were to change the pulse frequency to 1 PPS, the #2 would be 34 amps for 0.9 seconds followed by 17 amps for 0.1 seconds . . .
To calculate average current it's: (90% times 34 amps + 10% and 17 amps) divided by 100%.
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Originally posted by 4sfed View PostIf the terminology is the same as the 300DX, "Peak" is the percent of time at the set current, and "Background" is the percent of set current for the remaining time.
#1  60 amps 50% of the time
30 amps 50% of the time.
average current  45 amps
#2  34 amps 90% of the time
17 amps 10% of the time.
average current  32.3 amps
Then 34 amps x 90% = 30.6 peak amps
30.6 peak amps + 1.9 background amps = 32.5 average amps
is that how you're calculating back ground amps?
Leave a comment:

Originally posted by Weldhelp View PostI've read through this entire thread and it seems to be a good idea to centralize a place where process related info can be gathered on a particular machine. I notice no activity in some time now. This is a really good resource especially for a newbie like me. I documented this by cutting and pasting them into one file. I focused on the post that mentioned specific process and the settings used. Good 200DX quick settings reference resource!!! After experimenting with my 200DX, I have a question:
1. What is the difference between these two settings:
1. Amp 60, PPS 300, Peak 50, Background 50
2. Amp 34, PPS 300, Peak 90, background 50
if I understand correctly, I realize in #1 peak=30amps, background =15amps, and #2 peak=30amps (give or take .01 or so) background = 15 amps. If the numbers are equal the same amps output will the weld characteric (performance) be the same  minus the use of a foot pedal? Please let me know and correct me if I'm misunderstanding.
#1  60 amps 50% of the time
30 amps 50% of the time.
average current  45 amps
#2  34 amps 90% of the time
17 amps 10% of the time.
average current  32.3 amps
Leave a comment:

Originally posted by Weldhelp View PostI've read through this entire thread and it seems to be a good idea to centralize a place where process related info can be gathered on a particular machine. I notice no activity in some time now. This is a really good resource especially for a newbie like me. I documented this by cutting and pasting them into one file. I focused on the post that mentioned specific process and the settings used. Good 200DX quick settings reference resource!!! After experimenting with my 200DX, I have a question:
1. What is the difference between these two settings:
1. Amp 60, PPS 300, Peak 50, Background 50
2. Amp 34, PPS 300, Peak 90, background 50
if I understand correctly, I realize in #1 peak=30amps, background =15amps, and #2 peak=30amps (give or take .01 or so) background = 15 amps. If the numbers are equal the same amps output will the weld characteric (performance) be the same  minus the use of a foot pedal? Please let me know and correct me if I'm misunderstanding.
2nd question  what usually causes an EWG tungsten to ball up when welding mild steel?
If the tungsten balls welding steel, the polarity could be wrong, or possibly the machine is in AC.
To Tig weld steel, the polarity needs to be DC, straight polarity.
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