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Thread: 250-300 amp tig

  1. #101
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    Re: 250-300 amp tig

    Quote Originally Posted by Willie B View Post
    I bought the Dynasty 280DX when they first offered it. The expansion card came along after. It was talked about in the forums. I asked questions at the time. If I understand, balance controls amperage EN & EP half cycles. The card enables you to control the duration of the half cycles. In Example: 60 cycle would be 1/120 second EP- 1/120 EN amperage might be 120 Amps EN, 80 Amps EP. More honestly, it'd be expressed as a percentage.
    Amplitude gives also control of duration. Lets say you might choose 50/50 balance, but shorter EP half cycle.

    We'll have to ask Shovelon or Zank about the advantages, I'm over my head.
    As I understand it amplitude does not control duration, only amp value per cycle of either EN or EP. Duration is determined by balance and perhaps waveform like Triangle. Basically you get more penetration with increased EN, and less penetration with more EP. But in either case you have to equalize the effect on the electrode with balance. I initially understood the EN bias, but took me a while to understand the EP bias. With the EP bias for less penetration the cleaning strength is profound. But better limit the duration via balance as to not melt the electrode. I get even wetting on dissimilar thicknesses like 1/32 alum sheet to 1/2" alum plate, deposit the filler, and not get suckback or overpenetration on the sheet.
    Weld like a "WELDOR", not a wel-"DERR"
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  2. #102
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    Re: 250-300 amp tig

    Quote Originally Posted by shovelon View Post
    As I understand it amplitude does not control duration, only amp value per cycle of either EN or EP. Duration is determined by balance and perhaps waveform like Triangle. Basically you get more penetration with increased EN, and less penetration with more EP. But in either case you have to equalize the effect on the electrode with balance. I initially understood the EN bias, but took me a while to understand the EP bias. With the EP bias for less penetration the cleaning strength is profound. But better limit the duration via balance as to not melt the electrode. I get even wetting on dissimilar thicknesses like 1/32 alum sheet to 1/2" alum plate, deposit the filler, and not get suckback or overpenetration on the sheet.
    So balance is controlling the duration of EP? I should have known that, it's in the manual.
    An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.

  3. #103
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    Re: 250-300 amp tig

    Quote Originally Posted by Willie B View Post
    So balance is controlling the duration of EP? I should have known that, it's in the manual.
    Yes, balance controls not amps, but length of time negative or positive spends during each cycle. So for american interface 70% percent balance means 70% time EN spends penetrating versus 30% EP for cleaning. If you want more cleaning increase the time cycle is in EP. EP is DC straight, EP is DC Reverse. I can increase EP cleaning without adjusting balance by increasing the EP amplitude value for a short burst.
    Weld like a "WELDOR", not a wel-"DERR"
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  5. #104
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    Re: 250-300 amp tig

    Do all of the Dynasty 350DXs come with this feature as standard?
    Murphy's Golden Rule: Whoever has the gold, makes the rules.

  6. #105
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    Re: 250-300 amp tig

    Quote Originally Posted by Munkul View Post
    Do all of the Dynasty 350DXs come with this feature as standard?
    Yes they do.
    Weld like a "WELDOR", not a wel-"DERR"
    MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.

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  8. #106
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    Re: 250-300 amp tig

    When looking for a used machine, think bigger. The Syncrowave 250 is probably the most popular transformer machine & maintains high resale value. But, if you look for Syncrowave 300 or 350 size, then can be found for half the price of a 250! eBay often has them for $1200-$1500. Itíd mean a road trip, but worth it. I bought a Syncrowave 350 with pulser nearly 20 years ago & itís still awesome. I believe itís 100% duty cycle at 300 amps. I cleaned mine out really well & rewired the fan to run off 120v so itís pretty quiet since I (rarely weld over 200A. I routinely check the air coming out the louvers after hours of welding and itís never even been warm. An amazing machine!

  9. #107
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    Re: 250-300 amp tig

    Quote Originally Posted by Retearl View Post
    When looking for a used machine, think bigger. The Syncrowave 250 is probably the most popular transformer machine & maintains high resale value. But, if you look for Syncrowave 300 or 350 size, then can be found for half the price of a 250! eBay often has them for $1200-$1500. Itíd mean a road trip, but worth it. I bought a Syncrowave 350 with pulser nearly 20 years ago & itís still awesome. I believe itís 100% duty cycle at 300 amps. I cleaned mine out really well & rewired the fan to run off 120v so itís pretty quiet since I (rarely weld over 200A. I routinely check the air coming out the louvers after hours of welding and itís never even been warm. An amazing machine!


    I gave myself a few months to find a good used machine and yes I intended to buy a 350 if the opportunity presented itself.

    thanks for the advice

  10. #108
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    Re: 250-300 amp tig

    I found a dynasty 350 2013 with 12 hours on the screen. Full equip, cart, wireless pedal, tungsten grinder etc.
    What would be a fair price to make an offer, not easy beause of the year.

    Thanks in advance for your advice .

    Ralph

  11. #109
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    Re: 250-300 amp tig

    Quote Originally Posted by Ralphm View Post
    I found a dynasty 350 2013 with 12 hours on the screen. Full equip, cart, wireless pedal, tungsten grinder etc.
    What would be a fair price to make an offer, not easy beause of the year.

    Thanks in advance for your advice .

    Ralph
    About half the price of a new Dynasty 400 I reckon. But the Canada model may be more.
    Weld like a "WELDOR", not a wel-"DERR"
    MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.

  12. #110
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    Re: 250-300 amp tig

    Quote Originally Posted by shovelon View Post
    About half the price of a new Dynasty 400 I reckon. But the Canada model may be more.
    The seller is asking for more than that and i've been tring to lower it for a few days. I wanted to validate if my evaluation was good in terms of price. Hard negotiations.

    Very helpful

    Thanks

    Ralph

  13. #111
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    Re: 250-300 amp tig

    Quote Originally Posted by Ralphm View Post
    The seller is asking for more than that and i've been tring to lower it for a few days. I wanted to validate if my evaluation was good in terms of price. Hard negotiations.

    Very helpful

    Thanks

    Ralph
    You definitely don't want to pay (IMO) anywhere close to what a brand new warranty'd Dynasty 400 will cost that is for sure. You're not getting any warranty, and generally speaking, inverter PCB's are expensive and Miller's is no exception, I'm sure. You have to factor that into the cost in the unlikely event that one does go out.
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  15. #112
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    Re: 250-300 amp tig

    Quote Originally Posted by Oscar View Post
    You definitely don't want to pay (IMO) anywhere close to what a brand new warranty'd Dynasty 400 will cost that is for sure. You're not getting any warranty, and generally speaking, inverter PCB's are expensive and Miller's is no exception, I'm sure. You have to factor that into the cost in the unlikely event that one does go out.
    I understand that very well and thats why i'm trading down.

    And, this morning, i heard that HTP release the invertig 301 with smart cooler, exactly in my price range (and fullfill my needs). For me, it's a game changer (IMHO). Reasonable gap between the invertig 400 and the dynasty 280dx.
    If i can't make a deal with the 350, it will become a serious option.

    Thanks

  16. #113
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    Re: 250-300 amp tig

    Quote Originally Posted by Ralphm View Post
    I understand that very well and thats why i'm trading down.

    And, this morning, i heard that HTP release the invertig 301 with smart cooler, exactly in my price range (and fullfill my needs). For me, it's a game changer (IMHO). Reasonable gap between the invertig 400 and the dynasty 280dx.
    If i can't make a deal with the 350, it will become a serious option.

    Thanks
    Yea I saw that on my Instagram feed. If it's anything like my Invertig 400, which I'm sure it is, it's gonna be a kick a55 welder.
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  17. #114
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    Re: 250-300 amp tig

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    Thank you all for the help and the valuable advice tat allowed me to make a good decision (imo)

    In a few weeks i will give feedback on the operation and the quality of welding.

    Ralph

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  19. #115
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    Re: 250-300 amp tig

    Looks good.
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  20. #116
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    Re: 250-300 amp tig

    I had a tank near full of tri mix, a product supposed to work for stainless steel MIG. MIG welding stainless for me did not work. I confess the Manager at Airgas gave me bad information that "any shielding gas works for back purge".
    I was able to trade my tank of tri mix for helium. First round, it didn't cost much at all. Refill was $80. a few years back.
    I'm sort of stingy, I save helium for when I need it.
    Welding 5/8" thick aluminum was outside the power of a 280 amp inverter TIG. I had a nasty mess when I turned it over to weld the backside, had to grind the joint & multi pass the second side. Adding 5 CFH of helium allowed me to weld cleanly & quickly half way through, then turn over & finish without an overcooked mess.
    An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.

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  22. #117
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    Re: 250-300 amp tig

    Invertig 313 or perhaps dynasty 280dx for non budget options.

    Everlast's AD/DC tig box seems Ok but i've no idea how reliable it is.

  23. #118
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    Re: 250-300 amp tig

    Quote Originally Posted by XMilitary View Post
    Invertig 313 or perhaps dynasty 280dx for non budget options.

    Everlast's AD/DC tig box seems Ok but i've no idea how reliable it is.
    Look up. He just received his Invertig 301.
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