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With the high cost of propane lately, and the high initial cost of an induction; heater electrical resistance heating may be a good alternative. In the past I have seen people heating rivets with a spot welder when a user here (andrewwillis) posted a method to make a power supply to make a spot welder It got me thinking. It uses a rewound transformer from a microwave oven, they can be ganged in parallel to produce more current and, thus, greater capacity. It cost me nothing to build and was completed in about twenty minutes. They produce heat between the power attachments so they can be very local. Maybe for upseting or twisting, etc. In the video I am heating a piece of 1/4 rod about 4" long. I have been looking for a larger transformer to scale up the abilities.