Si3N4 Silicon Nitride Ceramic Locating Pin for Nut Projection Welding
High-hardness Si₃N₄ silicon nitride ceramic locating pins for accurate nut and sheet-metal positioning in projection welding and resistance welding. Excellent electrical insulation, wear resistance, thermal shock resistance, and high-temperature stability for demanding automotive welding fixtures. Custom sizes available.
Description
Advantages and Limitations
Advantages
✓ Excellent wear resistance
Suitable for repeated nut positioning and high-cycle welding applications.
✓ Electrical insulation
Helps prevent the locating pin from becoming part of the welding-current path.
✓ High thermal-shock resistance
Suitable for repeated heating and cooling during resistance welding.
✓ Low thermal expansion
Provides good dimensional stability under temperature changes.
✓ High-temperature resistance
Suitable for demanding welding environments.
✓ Reduced spatter adhesion
The ceramic surface can help reduce welding spatter buildup.
✓ Lightweight
Si₃N₄ has a relatively low density compared with zirconia and many metals.
Limitations
• Ceramic materials are brittle compared with metals.
The locating pin should be properly supported and should not be subjected to excessive impact or bending loads.
• Geometry and installation are important.
Sharp corners, thin sections and improper clamping can increase the risk of ceramic damage.
• Material grade matters.
Si₃N₄ properties vary significantly between grades and manufacturing processes, so the actual grade should be selected according to the welding conditions.
Typical Applications
Automotive Body Welding
Silicon nitride locating pins are particularly suitable for automotive body manufacturing, where nuts, brackets and sheet-metal components must be accurately positioned before projection welding.
Nut Projection Welding
The ceramic locating pin can be used to position nuts during nut projection welding, helping maintain the correct alignment between the nut and sheet metal.
Sheet-Metal Positioning
Suitable for locating holes and positioning sheet-metal components in resistance welding fixtures.
Resistance Welding Fixtures
Si₃N₄ ceramic locating pins can be integrated into custom welding fixtures where electrical insulation, wear resistance and thermal stability are required.
High-Volume Production Lines
The combination of wear resistance, thermal stability and reduced spatter adhesion makes silicon nitride suitable for repeated welding cycles in automated production environments.
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