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Gas is supposed to flow for about 15 -20 seconds after arc is dscontinued. My problem is gas flows until welder is disconnected from electric power supply.
A service manual or schematic of mother board would be helpful
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Check the gas ports found in the diffuser, and on some consumables brands, in the nozzle. These holes can also become clogged with spatter and restrict shielding gas flow to the weld pool. These components should be checked several times throughout the day, even if a shielding gas problem isn't suspected.
Inside the gun cable is a hose that contains both the liner and the shielding gas. This hose can also fail from overuse and holes can be created inside of the cable, through which gas can escape and you would never see it. This problem is mostly caused by using too small of a gun for the amperage being used to weld and from the constant flexing of the gun during use.
The inside diameter of the welding gun nozzle can also have an impact on shielding gas delivery. If the nozzle diameter is too small and gas flow is set too high, a venturi-type of effect can occur, drawing in the atmosphere and contaminating the gas supply. Also, if the nozzle is too large in diameter or the contact tip extends too far from the end of the nozzle or if the contact tip-to-work distance is too great, shielding gas coverage will be impacted. ELECTRICITY TRANSMISSION
Without good electrical flow between the power source, wire feeder, lead cable and work cable, you could experience a variety of problems, including a sputtering arc, excessive spatter and reduced equipment longevity. The best way to avoid these problems, or troubleshoot them when they occur, is to verify that all of the electrical connections between the welding components are tight and secure.
www.lincolnelectric.com/assets/global/...1/e689.pdf Lincoln ElectricENGINE DRIVEN WELDERS ... 50-225A DC 15-25V CV Welding ... Ranger® 225) for aluminum and other alloy welding. .... equipped with valve for gas flow.
try to use bare .032 wire and co2 shielded gas, If the equipment does not have a gas solenoid you may have to wire a solenoid to the trigger mechanism to get the gas to flow while the wire is feeding. The bare wire usually copper coated burns much hotter than the flux core when there is a gas shield. Also a .032 bare wire with a gas shield burns a a lower amp range and will get better penetration.
You may have to experiment with the feed rate and gas flow to get the correct setting, but the bare wire has a lot less resistance to current flow than the flux core and will burn a lot hotter when you use a gas shield.
At 115 vac there is not a lot of amperage left to create an arc and run the feeder and the rest of the unit , and the flux core wire takes a lot of amperage to burn both the wire and the flux . .
The normal set up on the 250 syncrowave will allow you to control your pre and post flow of gas. If the post flow is set up to more than 2 seconds that's the problem. If it is set on zero, then you have a leaky solenoid valve. Check your owners manual for troubleshooting anf repair.
Your gas hose or torch could be bad or plugged. Your gas solenoid on the welder itself could be bad. Disconnect the torch gas hose at the welder and see if you have gas coming out of the welder itself.
With a tig welder it is designed to do this. The gas is used to shield your weld of all airborne contaminates. Your welder should have a flow on start of weld and what they call a post flow. This post flow protects your finished weld from contamination. You can preset it from 0 to 30 seconds on a majority of welders. I would recommend you set a postflow for at least 10 seconds and hold the torch above your finished weld until gas shuts off. It is doing this for a reason! Too Protect your weld from oxidation and other contaminates while the molten weld pool sets up! Hope this helps out!
you may have a sticking solinoid valve or you are using far too much gas which is holding the valve closed. reduce the gas flow to 12-15 lpm.also check the potentiometer for the gas flow.
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