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As BrianR said, cleanliness of the pipe & the inside of the fitting is important. They make wire brushes for that purpose or you can use steel wool. Flint is also correct about too much heat. You need to heat evenly around the circumference of the fitting also. Shortly after the flux has melted you can test the heat by touching the solder to the joint. If it melts make a pass around the fitting. If you bend the solder into a semi-circle, you can get the side of the fitting that is away from you much easier.
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