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Thread: Troubleshooting no gas through torch

  1. Default Troubleshooting no gas through torch

    I am fairly new to TIG and have been having quite a frustrating time trying to practice on my 250EX. I thought my troubles were just inexperience, however it was suggested to me that the tungsten turning black is a sign of not enough shielding gas. I tried bumping up the post flow, but at this point I don't think gas is coming out through the end of the torch.

    After a lot of double checking connections, I finally tore apart the torch body itself to do some inspection. I disconnected the high pressure air line (the one shown in the attached photo), hit the pedal, and saw that there was a good flow of gas coming out of the hose with my regulator set to 10L/min. I then put my thumb over the end of the hose, hit the pedal, watched the flow go to 0, and released my thumb to find a woosh of pressurized gas come out. This lead me to believe that the gas system from my bottle to the end of the hose was tight and not the source of my issues.

    I also tried attaching the back cap onto the torch, with the high pressure line still disconnected, and blowing backwards through the torch head. It's moderately difficult, but still flows a tiny bit.

    Lastly, I reconnected the high pressure line to the torch head and threw the whole torch head assembly (except electronics) in a bucket of water. I didn't see any bubbles escaping from the hose connection nor the end of the torch were the gas is supposed to come out even after multiple taps of the pedal. The flow gauge was reading 10L/min for 5 seconds for each of these tests

    Any help would be appreciated.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Revelc; 09-18-2020 at 01:40 AM.

  2. #2

    Default

    I think you may have your torch connected up wrong. Where is your DINSE connector fitting going to? The cooler or the gas fitting?

  3. Default

    The gas hose is hooked up to the gas quick disconnect on the front of the machine. Gas comes out of the gas line when disconnected from the torch head at the fitting in the photo. After asking around elsewhere, I think it's likely that I melted the torch internals since I was running with no water. Lesson learned.

  4. #4

    Default

    That's not the gas line if it is coming from the DINSE connector. That is the return water line. Water cooled torches do not connect the same as air cooled torches. But if that isn't the connection you are calling gas, then, yes, you destroyed your torch. Water cooled torches are called water cooled for a reason. You'll do the same thing if you run a car without water.

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