thomas4age
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| posted on 29/11/07 at 11:31 AM |
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where to get that rehman tig?
Hey all,
after a little debate with myself on whether not to buy an AC tig welder, I decided that it would be a good idea because of a lot of ally welding I
need to do on the engine's intake system.
I heard that there was a group by on the rehman Tig everyone's talking about a few months back. are those still availeble through anyone on this
list? I'd rather buy from someone I know is telling the truth and having a complete set without suprizes instead of throwing a lot of money
towards china.
Grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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wilkingj
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| posted on 29/11/07 at 04:18 PM |
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I am fairly sure they all came from Ebay.
There was a bulk buy from China for some AC Tig sets, that was done by CalvinX.
The rehmans are DC (not seen an AC one on Ebay yet.
200Amps Dc go for around the £200. I paid £185 + £12 deliver from Germany.
160Amps go for a bit less.
You only need AC if you need to weld Ally.
DC set will do All steels including stainless.
You WILL Need pure Argon Gas, and thats where the expense lies, as its a Rented bottle from BOC / Air Products / Air liquide.
Hope that helps.
PS.. I am well pleased with mine (so far)
EDIT:
Ah... just noticed you are in the netherlands... maybe the gas suppliers are different there. But you still need the Argon.
[Edited on 29/11/2007 by wilkingj]
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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mad-butcher
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| posted on 29/11/07 at 08:18 PM |
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thomas
I bought the 160 version (made up with it )
Don't get involved in a bidding war, they sell about 10 a day.
I paid £130 for mine, the one before went for £160 the one after went for £96.
find one thats just gone on put in a maximum bid of £140 and wait to see if you don't win that one bid on the next one.
Tony
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Mansfield
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| posted on 29/11/07 at 08:50 PM |
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Same for me, very happy so far. Delivery is excellent. Mr Felzen does sell other machines, like this one:
http://cgi.ebay.co.uk/Rehmann-INV200-TIG200-AMP-AC-DC-Puls-Inverter-Electrode_W0QQitemZ130178659166QQihZ003QQcategoryZ113743QQssPageNameZWDVWQQrdZ1QQc
mdZViewItem
They seem to go around the £400 mark.
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rotax78
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| posted on 29/11/07 at 11:36 PM |
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what do you know, i bought one as well! i looked at his other items for sale and bought this 200amp version **
linky ** it was
listed in french and i got it for £144 which seems a good price. Mansfield where has your other avatar gone?  and what size tips and filler rod
have you been using? i've allready got my argon sorted locally from an independant £60 for a full pub sized bottle, then £19 a time to have it
exchanged for a full one, no rental charge. I have done a some lead welding and mild steel in the past with gas, but that was twenty years ago, and
i'm looking forward to giving the tig a try, at those prices its got to be worth a try. I currently have a mig but most of the time i'm
not over pleased by the end results
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thomas4age
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| posted on 30/11/07 at 09:43 AM |
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Thanx for the reply's guys.
ebay it is then, the rehman type is also availeble in ac dc tog 200amps so that's the one, I'll probably sell the cebora mig once
i'm used to tig
in holland you can best Buy your own bottle, you will then only pay for the gas itself when you need a new one, I allready have the bottles for argon
and mix gas so no problem there.
grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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wilkingj
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| posted on 30/11/07 at 09:57 AM |
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quote:
Originally posted by thomas4age
in holland you can best Buy your own bottle, you will then only pay for the gas itself when you need a new one, I allready have the bottles for argon
and mix gas so no problem there.
grtz Thomas
Remember its PURE Argon for TIG, not mixed gas.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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Mansfield
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| posted on 30/11/07 at 09:53 PM |
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Welcome to the Rehmann club, as you know you got your unit at a good price. I have watched the 'european' auctions and have seen they can
be cheaper than the UK ones. TBH apart from the BIN prices they all look cheap to me.
I am using 1.6mm gold tungstens (buy at least 3 of these and sharpen both ends before you start), high purity argon and 1.6mm triple deoxidised mild
steel rods. Gas flow seems to help the arc concentration, 5-6 lpm is recommeded for welding 1.6mm thick steel.
To me, TIG welding seems like a bit like snooker or golf. One day you are flying and think you have it cracked, the next you cant understand why you
are not better than the previous day. Persistance and decent tutition are the keys here I think. None of us will be Tiger Woods, Ronnie
O'Sullivan or (in our case) 907 overnight.
David
EDIT - although I am using 1.6 filler rods I am going to try some 2.0 as I cant keep up with the feed rate. Search wilkingj's posts for a
useful link to a table on what you should be using (it is 1.6 for locost box).
[Edited on 30/11/07 by Mansfield]
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thomas4age
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| posted on 2/12/07 at 08:17 AM |
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thing is I will mostly be welding aluminium for the intake system.
I missed 2 auctions this weekend,
since this is the tool section, is there an ebay tool? for bidding automaticly towards a highest price or something? the machine I'm after is 1K
euro's buy it know, last 2 nights I missed them for 680 and 710, so kind off fed up now.
the machine I'm looking for now is not the rehman, because that's 3 phase mains and hasn't got a very nice frequency range, only
70hz max, looking for 250hz at least.
grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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rotax78
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| posted on 2/12/07 at 04:37 PM |
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Thomas if you let me have your email address i'll forward you a link to a bid sniper that i use. You can enter your bid at the last second and
you don't need to be anywhere near a computer when the auction ends. You can also group items together, set your highest price and it will keep
bidding on the items in that group until you win one of them, it will not then bid on the others in the group. Might be best if you u2u your email
address to me if you like. There is a small fee for using the sniper i think that it's about 1% . I think that your first three sucessful snipes
are free and if you recommend someone you get another three free snipes. I have recommended it to loads of people so it has costs me nothing to use.
Anyway it might be what you want. Cheers Simon
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thomas4age
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| posted on 3/12/07 at 02:07 PM |
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hey all,
bit confused at the moment about all different types of AC tig welders and the terminology used in the adverts, I'm beginning to ask myself
wheter i'm chasing the right one so thought I'd ask for some expert help again.
what's the difference between ac frequenty and pulse frequenty.
I understand that a higher frequenty lets you make a narrower but deeper weldpool in aluminium. you can direct the arc better when welding on say
150hz compared to say 50hz.
but are they talking Pulse frequenty or a different frequenty?
I've read all eduction on the miller website but can't make a good conclusion.
there'a quite good adjustable ac/dc tig welders on ebay, but they all have toggle switch between ac/dc, and also feature a knob that toggles
between a flat line and square wave pattern, besides those 2 switches there's a potentiometer-knob that alters pulse frequenty from 0.5 to
300hz, is that the frequenty used to make the aformentioned weldpool narrowing/widing?
I'm getting the feeling that the chinese ac/dc welders like this one (see linky below) miss an importand feature of alloy welding, namely the
ability of setting the ac frequenty.
here's the front plate with the knobs for setting the machine
http://cgi.ebay.de/WIG-Inverter-AC-DC-TIG-200P-Pulse-HF-Schweissgeraet-MMA_W0QQitemZ270136118392QQihZ017QQcategoryZ124825QQrdZ1QQssPageNameZWD1VQQcmdZ
ViewItem
can anyone in the know help me out?
I'm a sound engineer for proffesion and there might be differences in terminology when talking bout frequenty's in carrier wave and audio
on the carrier wave (fm radio) which i think is sort of the way these ACtig work, but I could be talking out of my *** offcourse. so is this true?
pulse freq = fm freq and
ac-freq = actual audio on the fm freq
grtz Thomas
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wilkingj
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| posted on 3/12/07 at 03:17 PM |
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The Machine has two modes.
AC and DC.
When in AC mode the frequency of the pulses are variable. In the better machines you can control the duration of each half of the pulse.
(Ballance)
Edit - Pulse Duty on your picture.
Also the frequency of the Pulse rate. I dont know what the advantage of doing this is without reading up on it. But I am sure there is one.
In one half of the cycle the heat is injected into the workpiece and the other half into the tungsten (as they swap at being anode and cathode in each
part of the cycle).
Thus to get more heat into the workpiece you can shorten one half of the pulse reducing the heat in the tungsten.
(I cant remember if its the pos half or the negative half)
This gives more control over the heat distribution, and thus more efficiency and saves wearing out the tungsten as well.
You Need AC to weld Alluminium as this helps break down the natural oxide layer on the skin of the workpiece.
This is why its very very difficult to weld Ally properly with a DC TIG Set.
I believe you can get DC pulsed TIG sets. But this is just pulsing the DC ON and OFF. Probably useful with very thin sheets of metal so you can
control the heat input to the metal.
Its main use is in AC sets to give conrtol over the waveform as described above.
I am sure i will be shot down in flames if the above is incorrect.
I'm happy ot be wrong, then I will learn as well.
[Edited on 3/12/2007 by wilkingj]
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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thomas4age
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| posted on 3/12/07 at 04:42 PM |
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hmm Ok,
so what your saying is, the wave/flat-line selector ia actually DC pulse on/of could very well be true.
but still is the pulse frequenty knob on this machiene the same as ac frequenty used to make for narrower weld seams that this miller PDF file
states?
page 7 ac frequenty adjustment controll
http://www.millerwelds.com/pdf/gtawbook.pdf
I'd like to buy a machine that does this
grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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907
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| posted on 4/12/07 at 12:22 AM |
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Hi Thomas.
I will try to explain what all the knobs do on the above welder.
All welders seem to have similar functions but since they are often called different things it can be confusing.
top left to right
Pre flow. 0-1sec. The delay after gas flow and before current flows.
Peak current. Amp setting. In pulse mode it's the high part of the pulse.
Basic current. In pulse mode this is the low part of the pulse. Set as a percentage of the peak.
i.e. On 100amps peak and 50% basic the current will drop to 50amps.
Down slope. The time it takes to reduce to zero amps when the trigger is released.
Bottom left to right.
Arc force. Adjusts the volts when on MMA (stick)
Pulse frequency. In pulse mode adjusts the number of times per second the peak drops to basic and back again.
Pulse duty. Adjusts the length of the peak current. As the peak increases then the basic decreases.
(set at 50% they would be the same length)
Clean area width. Nothing to do with the pulse mode, this is the time the current is positive or negative.
On most welders it's called wave balance.
Gas after flow. Time the gas flows for after current stops.
The rocker switches are self explanatory.
AC or DC mode.
2T or 4T (press to start, release to stop. or Latch, press to start, press to stop)
Pulse mode on or off
Tig or stick
Pulse mode is used to give better penetration.
Using a slow frequency it's possible to use the peak to just melt through the metal without blowing holes.
A fast frequency, 100 Hz +, will agitate or stir the weld pool, giving better penetration of fillets,
and a more fluid flow of the molten pool, especialy when using disimilar filler rod.
Hope this helps. U2U me again if you need
Cheers
Paul G
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thomas4age
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| posted on 5/12/07 at 05:50 PM |
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Hey Paul,
So your awnser is YES. the pulse frequenty knob is the right frequenty for the smaller deeper weldpool.
I've found that for instance a cebora ac/dc tig welder has these two seprate values adjustable, AC 50-100hz and pulse 0.1-250hz
http://www.cebora.it/istr/ist934G.pdf
page 3
I don't know which one does what. as the chinese stuff doesn't have the ACfrequenty as an adjustable function, I would like to know before
buying an expensive tool.
Grtz Thomas
If Lucas made guns, Wars wouldn't start either.
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907
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| posted on 5/12/07 at 06:50 PM |
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quote:
Originally posted by thomas4age
Hey Paul,
So your awnser is YES. the pulse frequenty knob is the right frequenty for the smaller deeper weldpool.
I've found that for instance a cebora ac/dc tig welder has these two seprate values adjustable, AC 50-100hz and pulse 0.1-250hz
http://www.cebora.it/istr/ist934G.pdf
page 3
I don't know which one does what. as the chinese stuff doesn't have the ACfrequenty as an adjustable function, I would like to know before
buying an expensive tool.
Grtz Thomas
Hi Thomas,
It's a yes, but with a reservation.
I doubt it will make that much difference to the weld width.
A butt in 1.5mm ally may be 8mm wide. Up the Hz and it will still be 6mm (ish) wide.
On my Miller I can adjust the time of the pulse in relation to the background current. This is useful.
Not sure on this but it maybe that the 100Hz is the frequency of AC MMA,
and the .1 to 250Hz is the pulse Tig range.
IMHO
My advise to anyone buying an expensive Tig welder is to buy a recognized make, as would be used in industry.
Buy secondhand if funds don't allow a new one.
My Miller Dynasty DX cost me £1600 and was a year old. Runs off 110v, 240v, or 3 phase.
It's built like a brick sh*thouse. Heavy, solid, and will hopefully go for ever. 
I can weld at 150amps for an hour before the cooling fan comes on.
My other welders at work are Murex and Lincoln, both over 10 years old.
Payed for themselves many times over.
Good luck
Paul G
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thomas4age
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| posted on 5/12/07 at 07:07 PM |
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Hey PAul,
Thanx for that, now I know what you mean.
anyway I also agree with you on your opinion about better buying a older well known make machine, but living in holland also those are way above my
buget, (used machinery is very expensive over here)
I can buy the LCD vision thingy for about 750euro compared to more than 2100euro's for a used lager/heavy Phillips machine that has same power
(more than I need) fixed 50hz freq,
I don't plan on making a complete alloy car, I will probably only use it for making intake manifolds and intercoolers. so duty cycle's
aren't my biggest concern
also I don't have lots of room in the garage, so a small inverter based machine is probably better for me.
BTW is there an online miller pricelist somewhere? low dollar might make things intresting.
grtz Thomas
and thanx again!
If Lucas made guns, Wars wouldn't start either.
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907
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| posted on 5/12/07 at 11:03 PM |
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The Dynasty DX is not huge. (550 x 350 x 200mm)
On eBay.co.uk I found one ( 330190376123 )
US $2650 + 350 p&p to UK (Buy it now)
Import tax would need looking into.
Paul G
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wilkingj
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| posted on 6/12/07 at 09:00 AM |
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quote:
Originally posted by 907
The Dynasty DX is not huge. (550 x 350 x 200mm)
On eBay.co.uk I found one ( 330190376123 )
US $2650 + 350 p&p to UK (Buy it now)
Import tax would need looking into.
Paul G
I can confirm Paul's not very big, having seen it
Err... Thats his Dynasty Welder I am speaking about.
You would pay VaT when it enters the country.
Dont use Parcel Farce, as they charge you £13:50 just to collect the VaT. (got caught with my Megasquirt kit. (Used their priority mail)
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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