Spot welding with pulsed Nd: YAG lasers are the most widely used laser technology in industrial jewelry production where it is primarily used for the autogenous welding (without added special welding materials) of gold chain on automatic high-speed chain making equipment Alternatively, this type of laser source may be integrated into other types of robotic or automatically fed workstations (for the spot welding of earring posts to earrings) or even fitted out with glovebox style Class I benchtop enclosures for manual spot welding.
This latter is used particularly for high-end jewelry production and repair where the jeweler must weld around precious stones or for correction of porosity created in the casting process. In these cases, the jeweler may add weld material of the same alloy being welded. Laser welding was adopted in the jewelry industry for the welding of precious metal chains on automatic.
Chain making machinery because this process offers important advantages over traditional forms of welding precious metals. Because no welding material is usually employed and welding occurs by partial melting of the materials in the joint, no carat problems are created as a result of the welding process.
And because no welding alloys or flux solder powders are used, aggressive products and/or solvents need not be used to clean the piece, and therefore there is less risk to the jeweler and no waste disposal issues. Because flux solder powders are not required to create a strong weld, the traditional process of running formed but un-welded chain through a nitrogen oven to weld the links have been eliminated, simplifying and speeding up production with almost no loss of links, previously a great concern for industrial chain manufacturers.
Autogenous welding enables the joining of precious metals that differ from each other in terms of carats and alloy composition. Laser welded multicolor gold jewelry is easily recognized because, not having been subjected to furnace brazing, its different colors remain vivid, not darkened or mixed by the heating required for brazing.
|Type of Laser||Solid state laser|
|Laser source||Lamp pump|
|Single pulse energy||1-40J|
|Pulse energy||≤40J(50-100J optional)|
|Fiber cable core diameter||0.3mm/0.4mm/0.6mm|
|Power supply||AC220V ± 10% 50 / 60HZ|
|Cooling system||water cooling|