Carbon Steel Weld Stud with 3 Projections Under the Head

Name: Weld Studs

Material: Stainless steel, Carbon steel

These studs have a wide base that distributes the load and projections that concentrate the weld. The length listed is the overall length. Choose studs with a below-head forecast for a stronger hold that uses the full strength of the fastener. Pass these studs through a hole and weld them in place. Choose studs with above-head projection to weld the screw directly to the material's surface for a smoother appearance.

Application notes

This projection weld screw is self-locating and provides a flush surface for easy attachment of mated components. Three symmetrical weld projections underneath the head allow for a robust weld to be positioned appropriately and well balanced. No special tooling or fixturing is required.

For applications that require a flush-mounted, through-hole, weld screw that can be easily coupled with a mated component, this projection weld screw will get the job done. Its sturdy design ensures that resulting welds will be strong, balanced, and durable.

Juxin Fasteners has 23 years of experience in the industrial fastener business. We carry a full suite of industrial fastener products and pride ourselves on staying abreast of all industry trends and developments.

Size Can also be According to the Customer's requirement for manufacturing, please check the detailed specification sheet details PDF, CAD, 149-150 Page See more product details.

Automotive Welded Screws (Weld Studs): Structural Fastening Solutions for Modern Vehicle Manufacturing

What Are Automotive Welded Screws?

In automotive manufacturing, welded screws—commonly called weld studs—are threaded fasteners permanently joined to sheet metal components using a controlled stud-welding process.

Unlike conventional screws, which are mechanically driven into pre-tapped holes, weld studs are fused directly to the vehicle body or chassis by an electric arc. The process melts both the stud base and the substrate, forming a metallurgical bond that creates a highly durable threaded anchor point.

This technology enables manufacturers to integrate strong, load-bearing fastening points into thin sheet metal without drilling or tapping.

Core Functions of Weld Studs in Automotive Applications

1. Permanent Threaded Bases for Structural Assembly

Weld studs provide robust attachment points for bolts, brackets, modules, and structural components across the vehicle platform.

By eliminating the need for drilled and tapped holes in thin panels, they:

Improve structural integrity

Increase assembly efficiency

Reduce part count

Support high-speed automated production

Key Automotive Applications

Body Structure (BIW – Body in White)

Large-diameter weld studs (M8–M12) are commonly used in safety-critical areas such as:

Seatbelt anchorage systems (≥12 kN tensile requirement)

Anti-collision beams

Reinforcement plates

Door hinge brackets

These applications require high tensile performance and reliable weld integrity to ensure occupant safety during impact events.

Interior and Functional Components

Medium and small-diameter studs (M4–M8) are widely applied to secure:

Wiring harness brackets

Carpets and insulation panels

Door panel components

Electronic module brackets

Stud welding ensures accurate positioning and helps eliminate rattling or vibration-related noise.

Chassis and Undercarriage Systems

Weld studs are used to secure:

Suspension assemblies

Steering components

Brake line brackets

Underbody protection panels

In these applications, strength consistency and fatigue resistance are essential for long-term durability.

Performance Advantages in Automotive Manufacturing

1. Improved Sealing and NVH Performance

Because stud welding does not require through-holes in sheet metal, it:

Eliminates potential water and air leakage paths

Enhances body sealing performance

Improves NVH (Noise, Vibration, Harshness) control

Maintains overall body stiffness

This hole-free fastening solution supports higher vehicle refinement standards.

2. High-Speed Automation & Production Efficiency

Short-cycle arc stud welding is highly compatible with robotic automation.

Typical advantages include:

Single weld cycle time: 20–100 milliseconds

Over 30 welds per minute are achievable

Fully programmable welding parameters

Reduced labor and process complexity

This enables “one-weld-and-use” fastening without secondary operations.

Supporting Modern Automotive Technology Trends

Electrification (EV Applications)

In electric vehicles, weld studs are used for:

Battery pack enclosure fastening

High-voltage electrical grounding points

Power distribution mounting

Materials must be compatible with lightweight substrates such as aluminum alloys while maintaining reliable electrical conductivity.

Lightweight Materials & Dissimilar Metal Joining

With the increasing use of aluminum and magnesium alloys, capacitor discharge (CD) stud welding offers:

Minimal heat input

Reduced thermal distortion

Improved joining performance on thin materials

Effective dissimilar metal joining solutions

This makes weld studs a key enabler in lightweight vehicle design.

Intelligent Quality Control in Stud Welding

Modern automotive stud welding systems incorporate:

Precise current and time control

Lift height monitoring

Real-time parameter tracking

Torque verification testing

Mechanical hammer testing

These quality assurance measures ensure consistent weld strength and production reliability.

Main Stud Welding Process Used in Automotive Manufacturing

The most common method is short-cycle arc stud welding, which consists of:

Arc ignition – The stud lifts, and an arc is initiated

Melting phase – The arc melts both the stud base and workpiece surface

Pressure bonding – The stud is pressed into the molten pool

Rapid solidification – A high-strength metallurgical joint is formed

This process delivers consistent structural performance for high-volume automotive production.

Conclusion: The Invisible Structural Backbone of Modern Vehicles

Automotive weld studs serve as the invisible backbone of vehicle manufacturing. They combine:

Structural strength

Assembly efficiency

Lightweight compatibility

Automation readiness

Long-term durability

From life-critical seatbelt anchor points to precision wiring harness mounting inside the cabin, every welded stud contributes to vehicle safety, reliability, and comfort.

Why Partner with JUXIN for Automotive Weld Stud Solutions

With 23 years of manufacturing experience in industrial fasteners, JUXIN provides automotive-grade weld studs engineered for structural reliability and high-volume production environments.

We support OEMs and Tier suppliers with:

• High-strength weld studs (Class 8.8 / 10.9 and customized      grades)

• Carbon steel and stainless steel options

• Short-cycle arc and CD welding compatible designs

• Custom head configurations and special geometries

• Stable welding performance with minimal spatter

• Corrosion protection solutions (Zn plating, Geomet®, Dacromet®,      etc.)

• PPAP documentation support upon request

Our engineering team works closely with customers during the design and validation phase to ensure:

• Welding parameter compatibility

• Substrate material matching

• Structural load compliance

• Long-term durability under vibration and fatigue

With 23 years of industry expertise, we understand that in automotive manufacturing, consistency is not optional — it is critical.

Technical Consultation for Your Automotive Project

Whether your application involves Body-in-White structures, EV battery enclosures, or chassis assemblies, our team can provide application-specific weld stud solutions tailored to your production line.

Contact our engineering team today to discuss your project requirements.

Packaging: The inner packaging is a plastic bag, and the outer packaging is a carton. Then the tray. Carton size: 29*19*19.5cm and 23.5*17.5*8, cm and pallet size: 215*100*90cm, or as your request