CNC Tig welding

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31 Dec 2017 13:45 #103896 by SSP
CNC Tig welding was created by SSP
Hello all !
I have managed to put together a single axis TIG welding CNC machine for seam welding using Arduino & GRBL, using a GUI to send G code to the Arduino . The only hiccup is that the USB connection between the Arduino & the Laptop sometimes freezes when initiating the arc by HF initiation. When that happens , the g code that follows does not get executed, & the rest of the commands ( such as turning off the arc etc) have to be manually dealt with.
Can this problem be avoided by using Linux CNC & its supported hardware? If so , then how?
I have never used LinuxCnc before .
Hope this is the right place to post since, I did not see a CNC welding category anywhere.
Appreciate your help.

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31 Dec 2017 17:28 #103905 by chimeno
Replied by chimeno on topic CNC Tig welding
hello SSP,
the problem you have with high frequency will not solve linuxcnc, it is a problem of environmental noise, it is much easier, separates the control circuits further away from the TIG machine and isolates the masses of the two machines and put them to different lands , I also advise you that the control circuits are inside a metal box and connected to the ground, I hope I can help you.

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31 Dec 2017 22:14 #103913 by InMyDarkestHour
Replied by InMyDarkestHour on topic CNC Tig welding
This is something I'd like to see a vid of, sounds very interesting.

But the environmental noise advice is very sound indeed.

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02 Jan 2018 08:04 #103944 by cmorley
Replied by cmorley on topic CNC Tig welding
Linuxcnc can use ethernet cards which are better suited to noisy environments.
USB is not so good at noisy environments and or course are not realtime to begin with.
Hard to say without more idea what the actual problem is.
linuxcnc has been used with plasma cutters so can work well in that environment.

Chris M

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02 Jan 2018 20:00 - 02 Jan 2018 20:01 #103962 by Grotius
Replied by Grotius on topic CNC Tig welding
Hi,

I have also done a project with Inox Tig welding on CNC. The problem is indeed the HF ignition start of the Tig welding inverter.
Also HF plasma inverters have the same problem and are not usable for CNC. Only the expensive plama machine's with HF start are
good insulated to work with CNC. Then we talk about branches Hypertherm or Thermal Dynamics.

To reduce the problem you can try :

1. Make a good ground connection => machine to earth cable and ground
2. Use a opto isolated break out board.
3. Use mosfet relais (torch start) in stead of mechanical click relais.
4. Isolate your cnc hardware into a metal box
5. Use a differtent power connection for your tig inverter.
6. If your computer screen is flickering you know it's not good.
7. My experence is that after a time (can be a few weeks) your computer i/o can be broken.

SSP :

Can this problem be avoided by using Linux CNC & its supported hardware? If so , then how?

No no no hihi

Have luck !!
Last edit: 02 Jan 2018 20:01 by Grotius.

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04 Jan 2018 11:44 #104014 by tommylight
Replied by tommylight on topic CNC Tig welding
HF interference is a pain to deal with, but with some attention to details can be awoided always.
Proper grounding is the main part of the equasion, plasma cutter must have proper grounding, cables for torch ignition must be shielded and that shield connected only on the electronics side. All other cables and electronic must be as far as posible from the plasma, all power supplyes must be grounded to the mains ground.
Do not connect ground wires from plasma to electronics. Never.
Awoid daisy chaining ground wires, all should be on a single spot.
You should also use better usb cable, cheap ones have no shielding and some have straight data wites, they should be twisted inside.

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04 Jan 2018 23:06 #104036 by Grotius
Replied by Grotius on topic CNC Tig welding
To the text of Tommylight i added a picture for earth grounding of the machine

Attachments:

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05 Jan 2018 06:16 #104043 by SSP
Replied by SSP on topic CNC Tig welding
For all those who are interested..... a short video.
Fortunately, everything worked perfectly in this run. No crashes, hangups etc


The result
Attachments:
The following user(s) said Thank You: chimeno

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05 Jan 2018 08:06 #104045 by chimeno
Replied by chimeno on topic CNC Tig welding
Hello SSP,
I think it's great that it works for you at last! I am also a welder and I have a tic machine to weld steel and stainless steel, but I did not have time to test it. I hope I can someday get it done, I have a question, how did you make the metal wire welding device?

thanks
Chimeno

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13 Jan 2021 21:28 - 15 Jan 2021 15:09 #195254 by PrincessJasmW
Replied by PrincessJasmW on topic CNC Tig welding
Ohh man, that actually sounds really nasty. Did you actually solve this issue? What was the cause of the issue? and how did you solve it? I was actually thinking about, why do you want to use the Tig welder, as te MIG welder could actually be a better choice. However I actually understood that is kind of ...stupid to use the mig welder in this case. I used to work as a welder, and I understand you very much dude. I still remember, back when I was only getting started to work as a welder. I new that I need a respirator, however I had no idea which one to buy. Thanks God I found this review afterpaints.com/best-welding-respirator-reviews/ , it was probably one of the best price per quality ratio purchase I have ever done.
Last edit: 15 Jan 2021 15:09 by PrincessJasmW.

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