Electrospark Deposition (ESD) is a micro-arc welding process that welds material to a substrate often without causing a heat affected zone (HAZ). The material is deposited in molten “sparks” as electrical current is passed between the electrode and the surface. By varying the applicator and the electrical settings, one can join, coat and repair many similar and dissimilar materials with a true metallurgical bond.
Electrospark deposition is a micro-scale additive welding processes that:
- Produces a true metallurgical bond with substrate
- Keeps the substrate near ambient temperature; eliminating distortion, stress, and either reducing or preventing a heat affected zone
- Allows for dissimilar materials to be joined
- Produces consistent, thin layers
- Can be used for surface modification for hardness, wear resistance, corrosion resistance, friction, etc.
- Can be used an overlay for repair of worn, corroded, or defective components
Huys’ Low Energy Welding (LEW) equipment is the latest evolution of electrospark deposition. Some of its advantages are:
- Available with or without shielding gas (to eliminate oxidation in the process)
- Portability for field operation
- Integration into an automated system
Example Application 1: Surface Modification of Stainless Steel with Molybdenum Coating for Corrosion Resistance
Mo coated 304 stainless exhibits excellent corrosion resistance to 5% NaCl solution. It corrodes 350 times slower than 304 SS, and four times slower than DSS 2205.
Example Application 2: Repair of 6061 Aluminum Alloy 6061
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