Amada 1-288-01, Operation Manual, Page: 80 / 144

CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
5-16 990-372
NOTE:
For more details on this process, see
Resistance Set
in Chapter 4, Using Feedback
Modes and Weld Monitoring.
10. Since different levels of resistance require different amounts of time to reach the current
limit, return to the
RUN
screen and extend the programmed weld time (usually double
the time works). This will ensure that there will be enough time for the current to rise
and reach the limit, even with wide variations in initial resistance.
11. The power supply terminates the first pulse when your programmed current is reached. A low
resistance part will reach the current limit sooner and the pulse will terminate early. A highly
resistive part will require more time before the resistance decreases and current can flow.
12. Program your second welding pulse as
normal to achieve a strong weld.
Constant voltage is recommended for
round parts and constant current for flat
parts. An upslope may be required to
restrict the current flow early in the
second pulse and avoid weld splash.