CHAPTER 3: USING UB25 WELDING FUNCTIONS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
3-4 990-665
Single-Pulse Weld Profile
Applications
• Flat parts that do not have any plating or heavy oxides. Conductive parts made of copper
or brass.
Description
Single-Pulse is a term used by the industry to describe the simplest heat profile used for many
resistance spot-welding applications.
Single-Pulse Weld Profile
Upslope / Downslope Weld Profile
Applications
• Round or non-flat parts and most resistive materials.
Description
Upslope allows a gradual application of weld energy which permits the parts to come into better
contact with each other reducing the electrode to part contact resistances. Upslope can allow a smaller
electrode force to be used, resulting in a cleaner appearance by reducing electrode indentation,
material pickup and electrode deformation. It can also be used to displace plating and/or oxides,
reduce flashing and spitting, or reduce thermal shock when welding parts containing glass-to-metal
seals.
Downslope (annealing) assists in the grain refinement of certain heat-treatable steels, and prevents
cracking in aluminum and other materials by reducing the cooling rate. Annealing is not typically
used for welding small parts.
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