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Thread: CIG Transtig 150
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7th Jan 2016, 11:12 PM #31Most Valued Member
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8th Jan 2016, 07:00 AM #32Cheers.
Vernon.
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Bite off more than you can chew and then chew like crazy.
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8th Jan 2016, 09:34 AM #33Intermediate Member
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Yep the 150 has pre and post gas adjustment
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8th Jan 2016, 08:20 PM #34Most Valued Member
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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.
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31st Jan 2016, 12:17 PM #35Most Valued Member
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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.
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3rd Feb 2016, 03:53 PM #36Intermediate Member
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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
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6th May 2018, 10:50 PM #37Intermediate Member
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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
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9th May 2018, 03:30 AM #38
Possibly on this list there is something similar to your machine
Parts Lists and Instruction Manuals
Grahame
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13th Jun 2018, 11:23 PM #39Intermediate Member
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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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1st Oct 2018, 10:55 PM #40Intermediate Member
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still working on this when i can, been tracing around the main PCB with a osciliscope and comparing wave signals on both boards, it looks like something is goin wrong with the logic inside the board on the broken tig, so now im trying to reverse engineer the PCB and draw it down to see whats happening with the logic as they run logic gates such as nand, and, nor etc
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16th Dec 2018, 12:05 PM #41Intermediate Member
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Transtig finally fixed, ended up sending it to circuits unlimited up in QLD, the fault ended up being a very fine short circuit on the PCB and also a bad capacitor that was "taking off (oscillating).
Geoff from circuits unlimted knows these pcbs very well, only had to send him the main control board and not the whole machine
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14th Sep 2020, 10:33 AM #42New Member
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TransTIG 150 manual
Hi Bruce,
Do you still have that Transtig 150 service manual? If so, may I please have a copy?
[email protected]
Thanks in advance.
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