... it save 20% energy; it save60% water.. 36 KW bit welding equipment advantage:1, speed, high efficiency2, save electricity ... , 3 wing bit welding, 3 wing scraper welding, coring bit welding, no core drill bit welding, rivet pole coal bit welding, take ... equipment, drill induction heating welding machine, alloy welding drill bit, diamond bit welding, compound of various heating field drill welding. ...