This system can adjust load parameters automatically according to the load.
Under normal status, the load under no load is the lowest (less than 0.5A), and
the load is related to the factors like the welded work piece and the welding
pressure in the process of welding. Over high load may result in overload
protection. Some models can limit the load automatically.
(3) Pressure
parameters
Selection and adoption of pressure parameters often relates to such factors as
the welding area and the material of the weldment, and the amplitude of
welding head, etc. The pressure parameters exert direct influence on the
output load of the welder. Generally, the higher for the pressure, the higher
output load. However, over-high pressure will cause overload protection or
reduction of effective output. Therefore, pressure parameters shall be selected
as appropriate. For common small work pieces or non-crystallized materials
such as ABS, start adjustment from 0.2MPa; for larger work piece or
semi-crystallized materials such as polypropylene, polyethylene, or the
weldment with higher requirements for sealing, start adjustment from 0.4MPa.
(4)
Parameters for delay time
Delay time is the time for triggering ultrasonic. On the basis of the length of
time parameter, the welder may run in the following three modes (Note: some
models control ultrasonic triggering through adjusting the position of the
impact-piece of travel switch.)
a. Mode of advance triggering: the pickup current of the welder is
comparatively lower under this mode, which is often used for the
situation with difficulties in starting the welder.
b. Mode of critical triggering: the pickup current of the welder is unstable
under this mode, but the welding quality is comparatively better.
c. Mode of hysteretic triggering: the pickup current of the welder is
comparatively higher under this mode, but it can ensure relatively
accurate weld time.
Actual mode of triggering shall be selected according to actual commissioning
situation. For example, in the event of higher pickup current of the welder or
abnormalities, shorten the delay time appropriately and select the mode of
advance triggering.
(5)
Parameters for weld time
Weld time is the time for outputting the ultrasonic welding power, which
influences the quality of welding directly. Just like the pressure parameters, its
