POWER SUPPLIES
Resistance welding is a thermo-electric process in which heat is generated at the interface of the metal parts to be joined by passing an electrical current through the parts for a precisely controlled time under a controlled pressure.
Key advantages of the resistance welding process versus other technologies include:
- Very short process time
- No consumables, such as brazing materials, solder, or welding rods
- Operator safety because of low voltage
- Clean and environmentally friendly
- A reliable electro-mechanical joint is formed through resistance welding
Resistance welding power supply selection is driven by your application and just what kind of bond is needed. There are three basic types of bonds created in resistance welding:
SOLID STATE BOND
In a Solid State Resistance Welding Bond (also referred to as thermocompression bonding), dissimilar materials with dissimilar grain structure, e.g. molybdenum to tungsten, are joined using a very short heating time, high weld energy, and high force.
Thermocompression bonding tools include Capacitive Discharge Welders, HF Inverters, Linear DC Welders.
FUSION BOND
In a Fusion Resistance Welding Bond, either similar or dissimilar materials with similar grain structures are heated to the melting point (liquid state) of both. The subsequent cooling and combination of the materials forms “nugget” alloy of the two materials with larger grain growth.
AC Welders, HF Inverters.
REFLOW BRAZE BOND
In a Reflow Braze Resistance Welding Bond, a resistance heating of a low temperature brazing material, such as gold or solder, is used to join either dissimilar materials or widely varied thick/thin material combinations. The brazing material must “wet” to each part and possess a lower melting point than the two workpieces.
AC Welders, HF Inverters
