CHAPTER 3: USING UB25 WELDING FUNCTIONS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
990-665
3-3
Welding Applications
Weld Pulse Profile
Typical Application
Single-Pulse
Can be used for many of spot-welding applications. Use on flat parts
without plating, or on conductive parts such as those made of copper or
brass.
Upslope/Downslope
Upslope/Downslope should be used for the majority of spot welding
applications. Weld round parts, parts that are not flat, spring steel parts, or
heavily plated or oxidized parts.
Dual-Pulse
Use for spot welding parts with plating. First pulse can be used to displace
plating or oxides and the second pulse to achieve the weld.
For a detailed coverage of resistance welding theory, please refer to
Appendix C, The Basics of Resistance
Welding
.
Weld Head Applicability
The Power Supply is best used with an AMADA WELD TECH force-fired, manual weld heads or air
actuated weld heads. For manually actuated weld heads, the weld sequence begins when the force-firing
switch closes. For force fired, air actuated weld heads, the weld sequence begins when both levels of a
two-level foot switch are closed and the force firing switch in the air actuated weld head closes.
When the Power Supply is used with any air actuated weld head, the squeeze period must be long enough
to allow sufficient time for the electrodes to close and apply the required weld force to the parts before
the weld current begins. Weld current begins when the squeeze period ends. In addition, the hold period
can be used to automatically keep the electrodes closed on the parts after weld current has terminated to
provide additional heat sinking or parts cooling. The weld strength is formed during the hold period.
