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Multimatic 200 TIG Gas - Problem?

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  • Multimatic 200 TIG Gas - Problem?

    I have a multimatic 200 that I just started using for TIG (amateur - new to TIG). At the end of the day when I go to shut the welder down, before I turn the power off, I close the valve on the tank and then proceed to bleed off the gas. I press the foot control and hold it until the tank pressure goes to zero (it slowly drops while I'm holding the pedal down). However, the flow gauge only drops from 25 cfh to about 18 cfh. It stays at 18 cfh even after the tank pressure is down to zero. Releasing and pressing the pedal several times will not make it go down. I thought initially it might be a bad gauge so I tried a different regulator with the same results. When I disconnected the hose to change the regulator, the flow gauge went to zero. When using the welder with MIG, the same procedure (reducing wire speed and pressing trigger instead of foot pedal) results in zero tank pressure and zero on the flow gauge. I don't know if I have a problem or if this is the way the multimatic 200 is supposed to work with TIG.
    Last edited by rick66pony; 01-13-2013, 02:42 PM. Reason: response to monte55 comment

  • #2
    If you shut the welder down and press on foot control, nothing will happen. You may need to say again your problem with no mistakes.
    Nick
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    • #3
      Originally posted by monte55 View Post
      If you shut the welder down and press on foot control, nothing will happen. You may need to say again your problem with no mistakes.
      revised description

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      • #4
        Just an update for people who might search this forum with a similar problem.

        To better diagnose the problem, I purchased a meter that can measure gas flow at the nozzle. For mig, the output was very close to what was shown on the regulator/flow meter. However for tig, to get 20 cfh at the nozzle the flow rate at the regulator had to be set to about 60 cfh.

        I took the welder to a Miller service center (65 miles round-trip times 2) and they found (after a week) that the internal tig hose had been pinched when the machine was assembled. Easy repair - hassle to find.

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