... rate tin welding bar for PCB board1:good humidity,bright beautiful,fast 2:and high isolation resist Shenzhen ... the RMA grade of GB-T3131-2001.Waving soldering wire:Good humidity, bright soldering point, beautiful, fast, no halogen, no ion ... or distilled water (40-60).2: ultrasonic cleaning, fast and good effect if cleaning PCB soldering side on surface of ultrasonic liquid ...