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Have a lincoln square wave 175 tig maching with

Have a lincoln square wave 175 tig machinewith foot pedal. would like to add a hand operated switch to torch to be able to start or stop arc in hard to reach places where i cannot access pedal. i know of a chassis shop that did this but they wont tell me how. can you?

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Buy a Cobra lead and torch head already equiped would be you best bet.

Posted on Nov 15, 2009


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When using foot pedal for tig welding,does foot control ,increase voltage,and control the argon valve

The flow of the gas will be initiated and terminated by the use of the pedal, but it does not change the flow rate, just on and off. You will adjust your desired flow rate at your flow meter or regulator. I prefer a flow meter as I find them to be more accurate and easier to use.

The foot pedal will initiate and terminate the arc when used on a HF start tig welder. It works like a gas pedal. For example, if you have your machine set to 100 amps, by pushing all the way down on your foot pedal you'll get 100 amps. Some guys will set their machine wide open and just control the amperage with the foot pedal. I don't do it like that, although there is nothing wrong with doing it that way. I like to have a bit more sensitive amperage control. I will set my machine a little higher than I think I need and feather the foot pedal from there. This allows me to start at a low amperage and also taper off a bit smoother at the end.

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The contactor has failed or a fuse is blown. You need to take this one to the local welding supply shop for service.

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When the display shows RMT it means that the torch trigger is depressed. If that is not the case then the trigger might be bad or shorted.

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The foot control has a micro switch in it, this one must be worn out. Take it to your nearest werlder shop (like praxair... ) and ask for the microswitch by brand and model of your foot control. It's easy to replace. Probably the welder shop must order it, since it's noy pretty common for this switch to go bad, but it happens, specially on old welders.

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1 Answer

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You need to get a diagram of the connector on the pedal, and check the contacts leads that trigger the power on. If the power on contacts are not opening up when you let up on the pedal then the problem is in the pedal, and you will need to open it up to find the problem. If the pedal is opening and closing as it should the problem is most likely in the welders control board. I just went through a similar problem on my Miller TIG, where the pedal wasn't the problem. If you have a bad board in the welder there are places on the internet that rebuild them, for much less than Lincoln would charge for a replacement. Try the two places listed below for circuit boards if you need them.

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Check to see if the remote switch has been set, or if you have broken wire in your pedal lead. You might even want to open the pedal housing and take a look see. I've had more than my fair share that the contacts inside the pedal housing were worn or cooked. Good luck, hope it helps

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