Product Introduction

Welding screws, also known as spot welding studs, CD weld studs, planting welding pins and stud welding bolts, are high-precision fasteners specially designed for automatic stud welding on thin metal sheets. Our copper-coated carbon steel welding screws are manufactured in strict accordance with international standards, featuring stable performance, reliable welding and strong durability, which are widely used in sheet metal processing, electrical cabinets, automobile manufacturing, home appliances, communication equipment and construction hardware industries.

Made of high-quality low-carbon steel such as 10B21 and 35K, our welding screws undergo strict material inspection and heat treatment to ensure consistent hardness and mechanical properties. The surface is treated with high-standard copper coating, which significantly improves electrical conductivity, arc ignition stability and anti-rust performance during welding. Compared with ordinary uncoated products, copper-coated welding screws can effectively reduce welding splash, avoid false welding and desoldering, and form a firm and permanent welding point between the screw and the base metal in milliseconds.

Our standard product range covers M3, M4, M5, M6, M8, M10 and other conventional thread specifications, with customized lengths available according to customer requirements. The product structure is scientifically designed with a standard arc ignition point at the bottom, which is perfectly compatible with capacitor discharge stud welding machines, also known as energy storage welding equipment. It supports rapid welding on thin steel plates from 0.5mm to 3.0mm without damaging the reverse side of the sheet, which greatly improves production efficiency and assembly accuracy.

One of the core advantages of our welding screws is high welding efficiency. The entire welding process can be completed within 0.01 seconds, featuring no punching, no riveting and no tapping, simplifying the production process and reducing labor costs. The welded connection has high shear resistance and tensile strength, which is not easy to fall off even under long-term vibration and load, ensuring the stability and safety of the entire product structure.

In terms of application scenarios, our copper-coated carbon steel welding screws are widely used in various metal sheet assembly occasions. In the electrical cabinet and chassis industry, they provide stable threaded connection points for internal components; in the automotive industry, they are used for body welding and parts fixing; in home appliances and electronic equipment, they achieve compact assembly and beautiful appearance; in construction and decoration industries, they solve the problem of rapid fixing on thin metal surfaces.

We implement a full-process quality control system from raw material incoming inspection to production, surface treatment, finished product testing and packaging. Each batch of welding screws undergoes tensile test, welding test and salt spray test to ensure dimensional accuracy, surface quality and service performance meet customer requirements. The products are neatly packaged, not easy to rust or deform during transportation and storage, and can be directly used in automated production lines.

Compared with rivet screws, self-tapping screws and press-fit fasteners, welding screws have obvious advantages. They do not require pre-processing holes, will not cause sheet deformation, and have higher connection strength and better stability. For automated and mass production enterprises, choosing our high-quality welding screws means higher production efficiency, lower defective rate and longer product service life.

Our company has been engaged in the R&D and production of welding fasteners for many years, with mature technology, complete specifications and stable supply capacity. We can provide standard products as well as customized services for special materials, lengths and surface treatments to meet the individual needs of different customers.

In conclusion, our copper-coated carbon steel welding screws are ideal fasteners for modern sheet metal processing and industrial assembly. With excellent material, precise craftsmanship, stable welding performance and wide applicability, they can fully meet the high-standard requirements of various industries for connection fasteners. We are committed to providing customers with reliable, efficient and cost-effective welding screw solutions to become your long-term trusted partner in the field of fasteners.

Common problems with welding screws

1. What are welding screws / CD weld studs?

Welding screws (also called spot welding studs, weld studs, CD weld studs, or planting welding pins) are fasteners designed to be permanently welded onto metal sheets using a capacitor discharge (CD / energy storage) welding machine. They provide a strong external thread without drilling, tapping, or riveting.

2. What materials and surface treatments do you offer?

Our standard welding screws are made of high-quality low-carbon steel with copper plating.
• Copper coating improves conductivity, arc stability, and anti-rust performance.
• We can also supply stainless steel weld studs upon request.

3. What thread sizes are available?

Our standard range includes:
M3, M4, M5, M6, M8, M10
Custom lengths and special sizes are also supported.

4. What is the minimum sheet thickness for welding?

Our weld studs work well on thin sheets from 0.5 mm to 3.0 mm.
They do not burn through or damage the back of the sheet.

5. What welding equipment do I need?

They are designed for capacitor discharge (CD / energy storage) stud welding machines.
They are NOT suitable for arc welding, gas welding, or manual electric welding.

6. What are the advantages of welding screws over traditional fasteners?

• No drilling, tapping, or riveting needed
• Fast welding speed (within milliseconds)
• High strength and vibration resistance
• Clean appearance, no damage to the back of the sheet
• Great for automated mass production

7. Can welding screws be used on stainless steel sheets?

Carbon steel copper-plated weld studs are mainly for carbon steel, cold-rolled steel, and galvanized steel sheets.
For stainless steel sheets, we recommend stainless steel weld studs.

8. How strong is the welding connection?

When welded correctly, the joint is very strong — typically stronger than the stud itself. It has excellent tension and shear resistance, making it ideal for use in electrical cabinets, automobiles, home appliances, and sheet metal assemblies.

9. Do welding screws rust easily?

Our copper-plated finish provides good anti-corrosion performance for general indoor and outdoor applications. For harsh environments (humidity, chemicals, salt spray), we can recommend upgraded surface treatments.

10. Can you accept custom orders?

Yes. We support:
• Custom lengths
• Special thread sizes
• Custom packaging
• OEM / ODM support

11. What is your MOQ and lead time?

MOQ and delivery time depend on size and quantity.
For standard sizes, we usually have in-stock inventory for fast delivery.

12. How to avoid bad welding (false welding, spatter, falling off)?

• Use a stable CD welding machine
• Keep the welding surface clean and free of oil, rust, or paint
• Set correct voltage and time according to stud size
• Choose the correct stud for sheet thickness