JX-Q199B Overhead Projection Weld Bolts - Type B

Projection weld bolts have three pips on the thread side of the head. The stud is inserted through a hole in the base material and welded on the reverse side, resulting in a stud with excellent pull-out and torque-out performance.

Advantages of Carbon Steel Weld Studs

Low-carbon steel weld studs are suitable for use with HRB-80 or less materials. Benefits of carbon steel weld nuts include:

Cost-effective when compared to S.S.

Ideal for high-volume machine parts

Ideal for light and medium applications

Name:Overhead Projection Weld Bolts

Material: Carbon Steel, Stainless Steel

Carbon steel Grade:5.8,6.8,8.8,10.9

Projection Weld Studs & Screws

Proj Weld Studs

Stud welding refers to joining circular-shaped parts with flat workpieces using a welding arc and applying a pressing force. Projection weld studs and screws are particular types of fasteners that are specifically designed to be welded to another object. There is a wide range of spot weld stud, and tab weld stud options, depending on the specific application.

1. The working principle of projection welding:

Projection welding is an evolution of spot welding. Generally speaking, a mountain point is punched out on one of the two plates, and then welded. Due to the concentration of current, it overcomes the defect of nugget offset during spot welding. One or more nuggets form at the joint.

2. Features of the projection welding process:

During projection welding, the electrode must drop rapidly as the bump is sub-collapsed, otherwise spatter will occur due to pressure loss, so a projection welding machine with good electrode followability should be used.

The electrode pressure should ensure that the bumps are completely sub-collapsed when they reach the welding temperature so that the workpieces can fit closely. If the pressure is too high, the bumps will be crushed prematurely, and the function of projection welding will be lost.

The reduced flow density will reduce the strength of the joint, and the pressure will be too small to cause sub-heavy splashing.

Usually, the welding time of projection welding is longer than that of spot welding, and the flow is smaller than that of spot welding. Multi-point projection welding is a slightly longer welding time than single-point projection welding to reduce the difference in heating at each point caused by inconsistent bump heights.

The current required for each spot of projection welding is smaller than that of spot welding the same spot, but the current must be able to melt the bump before the bump is completely crushed. The welding current is approximately the current required for each bump multiplied by the number of bumps.

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.

Overhead Projection Weld Studs in Automotive Manufacturing

High-Strength Structural Fastening for Body, Chassis, and Electrical Systems

Overhead Projection Weld Studs play a critical role in modern automotive manufacturing. As vehicle platforms evolve toward lightweight structures, electrification, and high-speed automated assembly, projection stud welding has become a preferred fastening method for achieving structural integrity, production efficiency, and long-term durability.

Stud welding technology is widely applied across body structures, chassis systems, and vehicle electrical architectures. It provides permanent threaded anchor points without compromising sheet metal integrity.

What Are Overhead Projection Weld Studs?

Overhead Projection Weld Studs are specially designed fasteners with defined projection points that concentrate welding current and heat during the projection welding process.

During welding:

1. Controlled      current flows through the projection points

2. Localized      heat is generated at the contact interface

3. The      projections collapse under pressure

4. A      solid-state metallurgical bond is formed

This method ensures consistent weld quality, especially in automated robotic production lines and overhead welding positions commonly found in automotive body assembly.

Key Automotive Applications

1. Body Structure (Body-in-White)

Overhead Projection Weld Studs are extensively used in:

• Frame      assemblies

• Body      shells

• Reinforcement      brackets

• Door,      hood, and trunk support structures

By welding studs directly to structural panels, manufacturers create stable fastening points for subsequent assembly operations.

Engineering Benefits:

• Improved      torsional rigidity

• Reduced      deformation risk

• Minimal      heat-affected zone

• Consistent      positioning accuracy

• Enhanced      crash performance reliability

Because projection welding concentrates heat precisely at the projection interface, metal fatigue and distortion are effectively minimized.

2. Chassis and Suspension Systems

In chassis production, structural consistency and fatigue resistance are critical.

Projection weld studs are used to secure:

• Suspension      brackets

• Steering      assemblies

• Cross      members

• Underbody      protection components

Compared to multiple threaded connections, projection weld studs:

• Reduce      part count

• Increase      assembly speed

• Lower      total vehicle weight

• Improve      structural load distribution

This contributes to better vehicle handling stability and long-term durability.

3. Automotive Electrical and EV Systems

In both traditional and electric vehicles, stud welding is widely applied to secure:

• Control      modules

• Sensor      brackets

• Grounding      points

• Battery      enclosure components

For EV applications, projection weld studs provide reliable conductive attachment points while maintaining compatibility with lightweight substrates.

The strong metallurgical bond prevents loosening caused by vibration, shock loads, or long-term fatigue — ensuring electrical reliability and system safety.

Advantages of Overhead Projection Weld Studs Over Conventional Fastening

1. Automation Compatibility

Projection stud welding is fully adaptable to robotic production lines.

Benefits include:

• High      repeatability

• Short      weld cycles

• Reduced      manual labor

• Stable      quality control

Unlike traditional bolted assemblies, no tapping or secondary operations are required.

2. Structural Consistency

Because the stud is permanently fused to the substrate:

• Connection      integrity is uniform

• Torque      variation issues are eliminated

• Risk      of installation errors is reduced

• Long-term      fatigue performance improves

Projection weld studs ensure consistent structural behavior across high-volume automotive production.

3. Lightweight & Efficient Design

Projection welding eliminates the need for:

• Through-holes

• Additional      reinforcement plates

• Excess      hardware

This supports lightweight vehicle design strategies and reduces overall manufacturing complexity.

Considerations in Design and Maintenance

While projection weld studs provide superior structural performance, they are permanent fastening solutions.

Design engineers must evaluate:

• Service      life requirements

• Accessibility      for maintenance

• Replacement      strategy in case of component failure

With proper design planning, these considerations can be effectively managed without compromising performance.

Why Overhead Projection Weld Studs Remain Essential in Modern Vehicle Production

As automotive platforms shift toward:

• Electrification

• Lightweight      materials

• Modular      architecture

• High-speed      automation

Overhead Projection Weld Studs continue to deliver:

• High      connection stability

• Enhanced      vehicle rigidity

• Improved      crash safety

• Efficient      automated production

• Long-term      durability under vibration and fatigue

From body structural assemblies to chassis systems and EV electrical platforms, projection weld studs remain an indispensable fastening technology in modern automotive manufacturing.

Overhead Projection Weld Studs Manufacturer for Automotive Applications

Engineered Structural Fastening Solutions for High-Volume Vehicle Production

Overhead Projection Weld Studs are essential fastening components in modern automotive manufacturing. Designed for high-strength structural attachment and robotic automation compatibility, these studs provide permanent threaded anchor points across body-in-white (BIW), chassis, and EV systems.

As vehicle platforms demand greater rigidity, lightweighting, and intelligent production, projection weld studs have become a preferred fastening solution for OEMs and Tier suppliers worldwide.

With 23 years of experience in industrial fastener manufacturing, JUXIN delivers automotive-grade Overhead Projection Weld Studs engineered for reliability, consistency, and scalable production.

What Makes Overhead Projection Weld Studs Different?

Projection weld studs feature precisely formed projection points that:

• Concentrate      welding current

• Control      heat distribution

• Ensure      uniform weld collapse

• Minimize      spatter

• Improve      weld repeatability

This makes them especially suitable for overhead welding positions and automated body assembly lines where precision and consistency are critical.

Unlike conventional bolt assemblies, projection weld studs eliminate secondary threading operations and reduce assembly variability.

Automotive Applications of Overhead Projection Weld Studs

Body-in-White (BIW) Structural Assemblies

Used in:

• Reinforcement      plates

• Cross      members

• Door      and hinge brackets

• Seat      structure mounting points

Projection weld studs improve torsional rigidity and structural load transfer while maintaining panel integrity.

Because no through-holes are required, body sealing and corrosion resistance performance are enhanced.

Chassis and Suspension Mounting Systems

In chassis production, projection weld studs secure:

• Suspension      brackets

• Steering      system components

• Brake      line supports

• Underbody      modules

High-strength weld performance ensures fatigue resistance under dynamic loads and long-term vibration exposure.

EV Battery and Electrical Systems

For electric vehicles, projection weld studs are widely used in:

• Battery      pack enclosures

• High-voltage      grounding connections

• Power      distribution mounting structures

Low heat input and controlled welding parameters support the use of lightweight materials, such as aluminum substrates.

Engineering Advantages for Automotive Production

1. High-Speed Robotic Automation

Projection weld studs support:

• Short      welding cycles

• Fully      programmable welding parameters

• Consistent      weld penetration

• Reduced      labor cost

Production efficiency can be significantly higher than with traditional threaded fastening methods.

2. Improved Structural Integrity

Because the stud is metallurgically bonded to the substrate:

• Load      transfer is more direct

• Joint      consistency is improved

• Torque      variability is eliminated

• Long-term      fatigue performance is enhanced

This is critical for safety-related automotive structures.

3. Lightweight and Cost Optimization

Projection weld studs reduce:

• Part      count

• Assembly      steps

• Secondary      machining operations

This contributes to the overall vehicle lightweight strategy and optimized production cost control.

Quality Control and Manufacturing Capabilities

At JUXIN, Overhead Projection Weld Studs are manufactured under strict process control standards.

We provide:

• Carbon      steel and stainless steel materials

• Strength      grades such as 8.8 and 10.9

• Custom      head geometries and projection designs

• Surface      treatments (Zn plating, Geomet®, Dacromet®, etc.)

• Dimensional      and mechanical property inspection

• Welding      performance validation

Our 23 years of experience in industrial and automotive fastening solutions allow us to support customers from design consultation to mass production.

Consistency in weld quality is not optional in automotive manufacturing — it is mandatory.

Why Choose JUXIN as Your Automotive Weld Stud Supplier?

• 23      Years of Manufacturing Experience

• Automotive      Application Expertise

• Stable      High-Volume Production Capacity

• Engineering      Support for Welding Parameters

• Customization      for Special Structural Requirements

• Reliable      Global Supply Chain

We understand the demands of modern automotive platforms — structural safety, electrification, lightweighting, and the integration of automation.

 Request Technical Support for Your Automotive Project

If you are sourcing Overhead Projection Weld Studs for body structures, chassis systems, or EV applications, our engineering team is ready to support your project requirements.

 Contact us today to discuss technical specifications, customization options, and production capabilities.

Overhead Projection Weld Studs for EV Battery Pack

High-Reliability Fastening Solutions for Electric Vehicle Battery Enclosures

As electric vehicle platforms continue to evolve, battery pack structures require fastening systems that deliver structural strength, electrical reliability, lightweight compatibility, and automation efficiency.

Overhead Projection Weld Studs for EV Battery Pack applications provide a permanent, high-integrity threaded anchor solution specifically engineered for battery enclosures, module supports, and high-voltage grounding systems.

With increasing safety regulations and performance standards in the EV industry, projection weld studs have become a critical component in modern battery architecture.

Why EV Battery Packs Require Specialized Weld Stud Solutions

Electric vehicle battery packs operate under demanding conditions:

• High      vibration loads

• Thermal      cycling

• Crash      impact requirements

• Moisture      and corrosion exposure

• High-voltage      electrical conductivity requirements

Traditional fastening methods such as bolting or riveting often introduce additional holes, increase the number of assembly steps, or compromise sealing performance.

Overhead Projection Weld Studs eliminate these challenges by providing:

• Permanent      metallurgical bonding

• Hole-free      structural integration

• Improved      sealing integrity

• Reduced      assembly complexity

Key Applications in EV Battery Pack Systems

1. Battery Enclosure and Housing Structures

Projection weld studs are widely used in:

• Aluminum      or steel battery trays

• Upper      and lower enclosure covers

• Cross-member      reinforcements

• Side      impact protection frames

Because projection welding concentrates heat at defined projection points, it minimizes thermal distortion — especially critical for thin aluminum battery housings.

2. Module and Component Mounting

Inside the battery pack, studs secure:

• Battery      module brackets

• Cooling      plate supports

• BMS      (Battery Management System) brackets

• Cable      routing structures

The permanent threaded base ensures precise alignment and long-term resistance to vibration-induced loosening.

3. High-Voltage Grounding and Conductive Connections

Electrical grounding reliability is essential in EV battery packs.

Projection weld studs provide:

• Stable      conductive grounding points

• Low-resistance      electrical paths

• Strong      pull-out resistance

• Consistent      torque performance

This supports overall battery safety and system stability.

Engineering Advantages of Overhead Projection Weld Studs for EV Platforms

Lightweight Material Compatibility

EV battery enclosures are increasingly used:

• Aluminum      alloys

• High-strength      thin steel

• Mixed-material      structures

Projection welding offers controlled heat input and precise collapse behavior, making it suitable for lightweight substrates while maintaining joint strength.

High-Speed Robotic Integration

EV battery packs are produced in highly automated environments.

Projection weld studs support:

• Fully      robotic welding

• Short      cycle times

• High      repeatability

• Reduced      manual labor

This ensures consistent weld quality in high-volume production.

Enhanced Structural and Crash Performance

Battery packs must meet strict impact and safety regulations.

Projection weld studs:

• Improve      load transfer distribution

• Increase      structural rigidity

• Maintain      sealing integrity

• Support      crash energy management

Their permanent metallurgical bond enhances overall pack durability.

Quality and Performance Considerations

For EV battery pack applications, weld studs must meet strict requirements:

• High      tensile and shear strength

• Corrosion      resistance (Zn, Geomet®, Dacromet®, etc.)

• Salt      spray resistance

• Fatigue      durability

• Welding      parameter consistency

Precision control of projection geometry and material composition is critical to ensure uniform weld penetration and long-term reliability.

Juxin Fasteners Overhead Projection Weld Stud Solutions for EV Battery Systems

With 23 years of fastener manufacturing experience, JUXIN supplies Overhead Projection Weld Studs engineered specifically for EV battery pack structures.

We provide:

• Carbon      steel and stainless steel options

• Customized      projection designs

• Strength      grades such as 8.8 and 10.9

• Surface      treatment solutions for corrosion resistance

• Welding      compatibility consultation

• Stable      mass production capability

Our engineering team supports customers from initial design validation to full-scale EV production programs.

In electric vehicle manufacturing, fastening reliability directly impacts battery safety. Consistency, precision, and structural performance are non-negotiable.

Request Technical Support for Your EV Battery Project

If you are developing or sourcing Overhead Projection Weld Studs for EV battery enclosures, module mounting systems, or grounding applications, our team can provide tailored technical solutions.

Contact us today to discuss your battery pack fastening 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

Overhead Projection Weld Studs (Q199B)

Automotive Resistance Welding Fasteners According to QC/T 599 (B) – 2013

Overhead Projection Weld Studs (Q199B) are flat round head projection weld screws specifically designed for resistance projection welding in automotive manufacturing.

Manufactured according to QC/T 599 (B) – 2013, Q199B weld studs enable direct welding onto thin sheet metal without pre-drilling, creating reliable mounting points in high-volume automated production lines.

These weld studs are widely used in Body-in-White (BIW), chassis systems, and EV battery pack assemblies.

What Are Q199B Overhead Projection Weld Studs?

Q199B is a projection weld screw with:

Flat round head

Engineered projection welding points

Optimized collapse geometry

Automotive-grade dimensional precision

The projection design concentrates welding current at defined contact points, ensuring stable fusion and consistent collapse during resistance welding.

This design eliminates the need for pre-drilling, preventing substrate weakening and reducing leakage risk.

Standard Specification – QC/T 599 (B) – 2013

Q199B weld studs comply with the Chinese automotive standard QC/T 599 (B) – 2013.

Key technical features include:

Controlled projection geometry

Defined thread tolerances

Specified material composition

Mechanical property classification

Automotive production suitability

For international OEM supply chains, Q199B studs are often manufactured with documentation aligned to global automotive quality systems.

Core Advantages of Q199B Projection Weld Studs

1. High-Speed Automated Welding

The projection station design enables:

Concentrated current flow

Stable heat generation

Reduced welding time

High repeatability

Ideal for robotic projection welding systems.

2. No Pre-Drilling Required

Direct welding onto a thin metal sheet:

Preserves substrate integrity

Eliminates hole weakening

Prevents potential fluid leakage

Reduces manufacturing steps

3. Strong Mechanical Bonding

Typical mechanical grades:

Property class 4.8，8.8，10.9

Ensures adequate tensile strength and torque resistance for automotive structural applications.

Material and Surface Treatment

Q199B welding screws are typically manufactured from weldable carbon steel with:

Carbon content ≤ 0.25%

Common surface treatments include:

Natural anti-corrosion protection

Zinc plating with passivation

Surface finishing can be tailored to meet corrosion resistance requirements.

Typical Thread Sizes

Common metric sizes include:M5，M6，M8，M10

Custom sizes are available upon request.

Conclusion

Overhead Projection Weld Studs (Q199B) provide a reliable, efficient fastening solution for automotive resistance welding applications.

With optimized projection geometry and compliance with QC/T 599 (B) – 2013, they support high-volume automated production while maintaining structural integrity.

For OEM and Tier suppliers, Q199B weld studs offer a stable, cost-effective solution for fastening thin sheet metal.

Automotive Applications of Q199B Overhead Projection Weld Studs

From Body-in-White to EV Battery Pack Assemblies

In modern vehicle manufacturing, projection weld studs must perform reliably under dynamic load, vibration, and environmental exposure.

Q199B Overhead Projection Weld Studs are extensively used across multiple automotive systems.

1. Body-in-White (BIW) Structure

Q199B welding screws are widely welded onto thin sheet components such as:

Side panels

Floor panels

Roof panels

They serve as mounting bases for:

Door hinges

Hood hinges

Trunk lid mechanisms

Limiters and latches

These connection points must maintain dimensional accuracy and long-term structural reliability.

2. Chassis and Suspension Systems

On chassis components, including:

Subframes

Control arms

Cross members

Q199B weld studs secure:

Shock absorber mounting points

Stabilizer bar brackets

Steering mechanism connections

The weld must withstand vibration, torque, and fatigue loading.

3. Powertrain and Engine Compartment

In internal combustion vehicles, Q199B studs are used for:

Wiring harness brackets

Sensor mounts

Pipe supports

Stable welding prevents loosening during thermal cycling.

4. Electric Vehicle Applications

In EV platforms, Q199B weld studs are suitable for:

Battery pack housing mounting points

Motor housing brackets

Electrical grounding positions

Because EV battery trays often use thin sheet metal, projection welding without drilling preserves enclosure integrity and sealing performance.

Why Automotive Manufacturers Choose Q199B

Fast automated welding

Reduced process steps

Stable mechanical performance

Compatibility with thin sheet structures

Q199B weld studs are designed to integrate seamlessly into high-volume automotive production.

Engineering Advantages of Q199B Overhead Projection Weld Studs

Optimized Projection Design for Resistance Welding Stability

The key advantage of Q199B weld studs lies in their engineered projection-welding-station design.

Unlike conventional fasteners, projection weld screws rely on controlled current concentration.

Concentrated Heat Generation

The projection points:

Increase local resistance

Focus heat on specific areas.

Promote rapid fusion

Heat input follows:

Q = I² × R × t

Because current is concentrated at projection points, weld formation is fast and consistent.

Controlled Collapse Behavior

During welding:

Projections soften first

Collapse under electrode force

Form uniform fusion nugget.

Proper collapse ensures:

Strong mechanical bonding

Reduced porosity

Stable torque performance

Thin Sheet Compatibility

Q199B studs are particularly suitable for:

0.8 – 3.0 mm sheet thickness

Benefits include:

No substrate perforation

Reduced deformation

Improved sealing

Critical for automotive exterior panels and EV battery enclosures.

Mechanical Performance

Material: Weldable carbon steel (C ≤ 0.25%)

Mechanical grades:

4.8 (general mounting)

8.8，10.9 (higher strength structural application)

Mechanical properties must align with automotive load requirements.

Surface Protection Options

Depending on the application environment:

Natural finish

Zinc plating

Zinc passivation

Higher-corrosion-resistance coatings can be applied for chassis or EV battery pack use.

Conclusion

Q199B Overhead Projection Weld Studs combine:

Efficient resistance welding

Structural reliability

Process simplification

Thin sheet compatibility

They are a critical fastening component in modern automotive manufacturing.