JX-Q199B Overhead Projection Weld Bolts - Type B

Name:Weld Stud

Material: Carbon Steel, Stainless Steel

Carbon steel Grade:5.8,6.8,8.8,10.9

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.

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