... as portable ultrasonic welding machines, handheld ultrasonic welding machines, hand-held welding machine, portable welding machine, ultrasonic spot welding, ... removal process, compared to other traditional crafts (such as adhesive, scald together or screw fastening, etc.), with high production efficiency ... process is very fast ,welding time is only 0-999 seconds.2.Strength: Can bear more pressure and ...