... welding tents, air domes, banners, truckcovers. Tensile membranes high frequency welding machine 1. Professional for welding tent, canvas, inflatable ... 2. Features:1) NL-5557 anti-spark vacuum tube protection device2) With double sides slipway, accurate position ... : 7kVA, 9kVA, 15kVA, 18kVA, 25kVA Rectifier: silicon rectifier Oscillation tube: 7T84RB / 7T85RB / E3185 / 7T69RB / E3069 8T85RB / E3130 ...