It's a pain in the butt when I halfway through a seam and the iron melts the solder but leaves it lumpy. Also, one side of the tip seems to be hotter than the other. I sometimes have to hold the solder against the tip and wait for it to heat up. Is it possible for the iron to be okay and the tip defective. I've had this iron for a year or so and have always had this problem.
Any help is appreciated.