Overview of Silicon Nitride Welded Locating Pins
Silicon Nitride Welded Locating Pins are precision parts used for weld locating. It is made of a silicon nitride material with high strength, high hardness, high-temperature resistance, corrosion resistance and other excellent performance. During the welding process, silicon nitride welding pins can accurately locate the weldment to ensure the precision of the welding position and improve the welding quality. At the same time, its good abrasion resistance and stability can ensure that the accurate positioning function can still be maintained after many times of use, which is widely used in automotive, electronics and other industries that require high welding accuracy.
Silicon Nitride Welded Locating Pins
Features of Silicon Nitride Welded Locating Pins
High-Precision Positioning: Silicon Nitride Welded Locating Pins have high dimensional accuracy, which can accurately locate the welded parts and ensure the accuracy of the welded position, and the positioning error can be controlled within a very small range, which meets the requirements of the high-precision welding process and helps to improve the quality of the weld and the consistency of the product.
High-Temperature Resistance: silicon nitride has good high-temperature resistance; in the high-temperature welding environment, positioning pins can maintain stable performance and size, will not be deformed or softened due to high temperature, thus ensuring the accuracy and reliability of positioning, can withstand hundreds of degrees of high temperature without affecting its use.
High Hardness and Abrasion Resistance: With extremely high hardness and strong abrasion resistance, these pins withstand frequent use without showing signs of wear. This durability extends their service life, reduces replacement frequency, and lowers overall production costs.
Good Chemical Stability: Silicon nitride is chemically inert, resisting reactions with various substances used in welding. This stability ensures long-term, reliable performance in diverse working conditions.
Specifications of Silicon Nitride Welded Locating Pins
| Property |
Specification |
| Color |
Grey |
| Density |
3.21 g/cm³ |
| Compressive strength |
3000 MPa |
| Young's modulus E |
320 GPa |
| Maximum temperature (inert gas) |
1200 °C |
| Maximum temperature (air) |
1100 °C |
| Thermal conductivity @ 1000 °C |
16 W/mK |
| Thermal expansion (20 – 1000 °C) |
3.5×10⁻⁶ /K |
| Resistivity at 20 °C |
10¹² Ω·cm |
| Resistivity at 800 °C |
10⁷ Ω·cm |
| Dielectric constant |
6 |
|
Applications of Silicon Nitride Welded Locating Pins
Automotive Manufacturing: Essential for welding engine blocks and transmission housings, these pins ensure precise part alignment, enhancing engine and transmission performance and reducing issues caused by welding errors.
Electronic Equipment Manufacturing: Used in welding phones and computer casings, these pins achieve high-precision positioning, improving overall product quality and meeting the industry's miniaturization and precision requirements.
Aerospace Field: Aerospace field: In the welding of aircraft wings and fuselage structural parts, silicon nitride welding locating pins plays a key role. It can maintain stable positioning performance under high temperatures, high pressure and other complex environments, ensure welding quality, ensure the strength and reliability of aerospace parts, and meet the strict requirements of the aerospace industry on product quality and safety.
Mechanical manufacturing: In the welding processing of various mechanical parts, such as gearboxes, machine tool beds, etc., silicon nitride welding locating pins can improve welding precision, reduce welding deformation, and ensure the assembly precision and motion precision of mechanical parts, thus enhancing the performance and service life of the whole mechanical equipment.
Company Profile
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, ceramic products, 3D printing powder, etc.
The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.
If you are looking for high-quality Ceramic Products please feel free to contact us or click on the needed products to send an inquiry.
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5 FAQs About Silicon Nitride Welded Locating Pins
Q1: What are the specific advantages of silicon nitride locating pins in bump/spot welding?
Spark-Free Welding: The insulating properties prevent current from passing through the pin, avoiding burnout of nut threads and reducing the need for subsequent machining.
High Life: With a hardness of HRA93, these pins are highly wear-resistant, lasting 72 times longer than stainless steel pins, significantly reducing replacement frequency.
High Precision: Dimensional tolerance of ±0.005mm and positioning error <0.01mm ensure consistent welding results.
Q2: What is the operating temperature range of silicon nitride locating pins?
Short-Term Temperature Resistance: Up to 1400℃.
Long-Term Stable Working Temperature: ≤1200℃. Beyond this, a dense silicon oxide film (SiO₂) forms on the surface, further enhancing oxidation resistance.
Q3: How to maintain the silicon nitride locating pin?
Cleaning: Wipe with alcohol or a neutral solvent to remove residual metal debris.
Inspection: Regularly check surface wear using a microscope; replace if wear exceeds 0.02mm.
Storage: Keep in a dry environment, away from corrosive gases like hydrofluoric acid.
Installation: Use non-impact assembly methods to prevent brittle fracture (silicon nitride has a fracture toughness of 3-5MPa・m¹/²).
Q4: Are silicon nitride locating pins fragile? How to avoid damage?
Avoid Shock: Use special fixtures during installation and avoid knocking.
Thermal Shock: Sudden temperature changes (>500℃) can cause cracking; preheat to 100-200℃ before use.
Optimized Design: Use rounded transitions to reduce stress concentration; consider fiber-reinforced silicon nitride for increased toughness (up to 30% improvement).
Q5: Why are Silicon Nitride locating pins more expensive?
Material Cost: High-purity silicon nitride powder (>99.5%) and complex preparation processes (e.g., carbothermal reduction) contribute to the cost.
Processing Difficulty: Special processes like laser and diamond grinding, which are 10-50 times more expensive than metal processing, are required.
Comprehensive Value: Despite the higher unit price, the long life and process savings result in a comprehensive cost that is only 1/70th of stainless steel.
