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Old 05-31-2018, 05:40 PM
Razorhunter Razorhunter is offline
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Default Help me understand converting a stick welder for TIG

I'm going to try a little scratch start TIG with an old Lincoln buzzbox. I have the adaptor that the stinger clamps to, and I also have a 150 amp torch with gas valve on it.
So given there is no foot pedal, I've read you just have to "snap out" of the arc. My question is regarding the gas flow. -Do I need to quickly snap out of the arc, and then quickly point the torch back at the cooling puddle to attempt to give it some postflow, or is it just bound to get some oxidation that cannot be prevented?

Secondly, and someone correct me if I'm wrong here, but I think that for a TIG machine to weld aluminum, it must be AC capable, right? So why cant my AC/DC buzzbox also do scratch start TIG on aluminum?
Is it because there is no high frequency? Can someone clear this up for me? Thanks so much.
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Old 05-31-2018, 05:59 PM
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LW Hiway LW Hiway is offline
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This is as much as I know, or care to know about using the Lincoln Box for TIG. I know it works for this guy, but he's done a bit more work to the box itself for that process.
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  #3  
Old 05-31-2018, 08:14 PM
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Shade Tree Welder Shade Tree Welder is offline
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Quote:
Originally Posted by Razorhunter View Post
I'm going to try a little scratch start TIG with an old Lincoln buzzbox. I have the adaptor that the stinger clamps to, and I also have a 150 amp torch with gas valve on it.
So given there is no foot pedal, I've read you just have to "snap out" of the arc. My question is regarding the gas flow. -Do I need to quickly snap out of the arc, and then quickly point the torch back at the cooling puddle to attempt to give it some postflow, or is it just bound to get some oxidation that cannot be prevented?

Secondly, and someone correct me if I'm wrong here, but I think that for a TIG machine to weld aluminum, it must be AC capable, right? So why cant my AC/DC buzzbox also do scratch start TIG on aluminum?
Is it because there is no high frequency? Can someone clear this up for me? Thanks so much.
So if a guys decides he is overweight and wants to get a little exercise in,
so he starts climbing Mt. Everest. That is kinda what you are doing here.

At least you know you are starting in a hole.

Went you are starting a stick welding (SMAW) electrode you are effectively
scratch starting the arc. you need to do a similar start on your tungsten.
But unlike SMAW you will be contaminating your tungsten every time.
But hey you are not doing shit for a nuclear reactor or NASA.

Generally you are correct you DC- weld steel and steel alloys, and AC weld
aluminum. But there is more to it than that a AC stick machine has a
balanced waveform at 60 Hz. Generally AC TIG (GTAW) is an unbalanced
wave to the negative side. This allow better penetration and still adequate
cleaning. The HF is only active during starting of the arc to allow the arc to
start with out touching the base metal.

Best of luck.

You'll need it.
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Old 05-31-2018, 10:22 PM
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toprecycler toprecycler is offline
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When DC tig welding steel / Stainless the HF is only on to help start the arc. Once the arc is established, the HF turns off. If you do not have HF then you scratch start the arc, thus contaminating your tungsten like Shade said.

In AC tig for aluminum, the HF remains on because each time the current switches from negative to positive, the arc will go out. The HF keeps the arc going.

It is possible to weld aluminum with DC also, but recommends Helium gas to do so.


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Old 06-01-2018, 07:18 PM
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TriHonu TriHonu is offline
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There were a few companies that made a High Frequency box that you attached to your stinger and ground cables.

I have one like the one below that I used in my desire to learn to TIG weld.



Some discussion on it Shop Floor Talk.com - Scratch TIG

I never could get good results with my arc welder. I ended up buying an older transformer TIG welder and the learning curve was much more manageable.
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Old 06-01-2018, 07:28 PM
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Shade Tree Welder Shade Tree Welder is offline
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Quote:
Originally Posted by toprecycler View Post
In AC tig for aluminum, the HF remains on because each time the current
switches from negative to positive, the arc will go out. The HF keeps the arc
going.
Not in all machines, older sine wave machines, the HF was full time.
Inverters running a square wave AC wave form often and turn the
HF off at the swing from negative to positive is fast enough that the
HF is not needed.

Dynasty 300DX Owners Manual.

HF Start
When HF Start button light is On,
start arc as follows:
High frequency turns on to help
start arc when output is enabled.
High frequency turns off when arc is
started, and turns on whenever arc
is broken to help restart arc.


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  #7  
Old 05-03-2019, 05:07 AM
bunkclimber bunkclimber is offline
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Default stick welder to TIG

when you snap out of the arc you may leave marks on your workpiece,I guess it depends on what you are working(welding)on whether its allowable or not. Yes you may break the gas cloud but there should be enough gas volume to give you an envelope to shield the work. For my money Id buy an AC/DC TIG machine, not try to adapt a stick machine to a different job. Trying to learn the process with the inherent difficulties of not having a control(footpedal or thumb)to control heat on the fly makes this even harder to overcome.You're gonna be constantly battling the machine,not working with it..There's a lot of used TIG machines out there for reasonable money. IMO,it's kinda like using an adapter to convert a angle grinder into a drill press.
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