Ultrasonic welding conditions:

As a condition of ultrasonic welding, the most important is the time (vibration, welding time) and pressure of applying welding energy, of course, other conditions are also very important.

Welding temperature Viscous flow temperature of ultrasonic welding materials. Otherwise the material won't melt. It depends on the amplitude, the higher the amplitude, the higher the temperature rise. Pressure to use cylindrical staring to pressure molding products. General compressed air pressure is 0.1-0.3mpa (pressure gauge), sometimes higher. However, if high pressure is used, the vibration of the cylinder will be blocked.

The welding time varies with the type of material and the shape of the product. For some molding products, only 0.2 seconds is enough. Too long time will cause excessive welding and produce a large number of flanges and bubbles, resulting in poor air tightness, must be paid attention to. Cooling (hold) time For crystalline plastics, where the joint is solidified at temperatures below the melt point, the pressure time is usually maintained between 0.1 and 0.2 seconds.

Ultrasonic welder requirements:

The welding head is divided into three parts from bottom to top: welding head, amplifier and transducer. The three are magnified in proportion. If the amplitude of the transducer is 6MM, the amplifier can be tripled to 18MM, and the amplitude to the weld head can be increased to 36MM. Of course, as the amplitude increases, the service life of the welding head will decrease. The amplitude required varies with the material being welded.

Welding head materials are generally three kinds:
Titanium: expensive, best performance, good toughness, difficult to process. Small friction loss, large amplitude can reach 60MM;
Aluminum alloy: cheap, fast wear, amplitude can not exceed 30MM, easy to process;

Steel: very hard, most unsuitable welding head, amplitude can not exceed 25MM, suitable for cutting, need to add air blowing pipe, easy cooling.