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  1. #31
    Join Date
    Sep 2010
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    Lebrina
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    Quote Originally Posted by RVK355 View Post
    Finally got around to having a look at the 150 transtig that i bought last year listed as not working.

    Good news is it works, strikes a arc and welds in stick mode, welds in tig mode, both DC and AC, only problem seems to be with the HF circut, sometimes the hf will work, but most of the time to get it to weld you have to hold down the trigger switch and manually strike a arc in tig mode, as soon as the arc is struck the gas soldenoid kicks in.

    I havent checked the spark gap yet, il do that when i pull the covers off for a look inside.

    All 3 fuses on the rear dont look to be blown either but il put my multimeter accross them just to be sure.
    Interesting, arc initiation is quite difficult in the absence of shielding gas, so that issue definitely needs to be worked on. Do the 150's have a pre and post flow adjustment?
    The HF must be kicking in at some point as you couldn't AC TIG weld without it.

  2. #32
    Join Date
    Oct 2006
    Location
    Armidale NSW
    Age
    47
    Posts
    868

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    Quote Originally Posted by Karl Robbers View Post
    The HF must be kicking in at some point as you couldn't AC TIG weld without it.
    Really? I'm pretty sure on my 250 I have AC welded without the HF always on (just start) ... but I don't do a lot of AC welding, so maybe I'm misremembering.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  3. #33
    Join Date
    Nov 2015
    Location
    Adelaide
    Posts
    18

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    Yep the 150 has pre and post gas adjustment

  4. #34
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    Sep 2010
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    Lebrina
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    1,257

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    Quote Originally Posted by Vernonv View Post
    Really? I'm pretty sure on my 250 I have AC welded without the HF always on (just start) ... but I don't do a lot of AC welding, so maybe I'm misremembering.
    I will give it a go tomorrow if I get a chance to confirm, but my understanding (and trade teaching), is that constant HF is needed to maintain the arc as the current transitions from electrode positive to electrode negative. Perhaps a modern inverter with insanely high frequency might be able to maintain an arc, but I am fairly certain that both sine and square wave machines will need the HF. The Transtig 150 has a relatively low OCV of only 55V, so I will be even more surprised if it maintained a TIG arc without HF.
    To add a little more to the theory. Those who stick weld will recall that some electrodes will not run on AC, due to the lack of arc stabilising elements in the flux, while others have minimum OCV (70V), requirements on AC.

  5. #35
    Join Date
    Sep 2010
    Location
    Lebrina
    Posts
    1,257

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    Well, I gave it a go, unintentionally as it turns out, as I forgot to switch the HF to constant when I swapped from DC to AC. My machine did hold an arc provided arc length was kept short, however it was not a pleasant sounding arc at all and while itwould probably have been possible to weld with, it sounded like it was missing the odd cycle and was running at 30Hz instead of 50Hz if that makes sense. The arc was nowhere near as focussed as normal and I straight away realised something was amiss.
    In a nutshell, you could possibly run a weld with AC HF start only, but you wouldn't by choice and your machine's capacity would be reduced somewhat from what I saw. I learned something from that inadvertent little experiment though as I was pretty confident it was a black and white no go situation.

  6. #36
    Join Date
    Nov 2015
    Location
    Adelaide
    Posts
    18

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    Interesting test Karl, when i tried it, it welded fine in AC sounded like 50hz, so its probably just something to do with the HF start, i havent had a chance to look at it anymore, but in due time i will

  7. #37
    Join Date
    Nov 2015
    Location
    Adelaide
    Posts
    18

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    Finally got around to having a good look at this transtig 150 i have here with a HF start problem.

    After abit of time with the covers off and doin the basic checks then digging deeper, there is no problem with the HF curcut its self, both HF and gas valve relays activate when electrically bypassed, traced the problem back into the main control board its self, this is where it gets abit tricky as with out a schematic the problem can be alot harder to trace "lot of logic circuts, schmit triggers, opp amps"

    I rang the cigweld tech support and unfortunatly they dont have a main main PCB control board schematic in their archives.

    Now i have got thinking, i know alot of these older cig "transtigs" are rebranded tig welders from other manufacuters, would anyone happend to know if the transtig 150 is a rebranded machine, or is it unique to cigweld!!!

    Any help or pointers would be appreciated

    Cheers
    Mondo

  8. #38
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    4,421

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    Quote Originally Posted by RVK355 View Post
    Now i have got thinking, i know alot of these older cig "transtigs" are rebranded tig welders from other manufacuters, would anyone happend to know if the transtig 150 is a rebranded machine, or is it unique to cigweld!!!

    Possibly on this list there is something similar to your machine

    Parts Lists and Instruction Manuals

    Grahame

  9. #39
    Join Date
    Nov 2015
    Location
    Adelaide
    Posts
    18

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    Quote Originally Posted by Grahame Collins View Post
    Possibly on this list there is something similar to your machine

    Parts Lists and Instruction Manuals


    Grahame
    Thanks for the reply Grahame, looked through all the manuals, couldnt find anything that resembles the cig, looks like the transtig 150 is possibly unique to Cigweld.

    Apon futher investigation, the transtig 275 schematic is very similar to the 150, infact the 150 has the same part number on the pcbs, all wire pin outs and numbers are the same. Id assume just a smaller transformer.

    On another note i have acces to a working transtig 150, so i should be able to use that to compare voltages/wave forms on the main PCB.

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