... without any flux, gas, solder.5, no welding sparks, environmental protection and safety.Local advantages:1, using phase-locked PLL ... of solid surface with a welded, high strength, aesthetics, environmental protection and so on. Easy to use, built-in ... and metal products industry.Company Brief IntroduceDongguan BRDASON Ultrasonic Equipment Co.,Ltd has been dovoted in the design, manufacturing and sales ...