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There's a few things that come to mind. I'm assuming you are using a naturally aspirated forge. First, increase the propane pressure. If that doesn't do it you might adjust or make a choke. And finally, I looked to see where your location is. Since naturally aspirated forges don't work as well at higher elevations it might not be capable of doing what you need.
Here's a test. Take 2 pieces of 1/2" round stock and place them in your forge. Bring to to red and flux then put back in and let them come to heat. Touch them together. If they stick your at welding temperature.
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