Heavy-Duty Projection Welding Solution for M20 Nuts and Stud Bolts

Engineered for automotive body panels, sheet metal fabrication and structural assembly. This stationary resistance projection welder delivers consistent, high-strength welds for large M20 nuts and stud bolts in production line environments.

✗ M20 nuts falling off after welding due to insufficient fusion

✗ Inconsistent weld nugget size across production batches

✗ Electrode wear causing progressive quality degradation

✗ Difficulty maintaining weld strength on thicker sheet metal plates

1. Pre-Formed Projections — Concentrated Welding Energy

M20 nuts feature pre-designed projections on the contact surface. When the electrode presses down and high current flows, these projections concentrate heat at precise points, creating strong localized fusion between the nut and the steel plate.

2. High Current Output — Deep Weld Penetration

The machine delivers sufficient welding current for large M20 components. The projection welding process generates a consistent weld nugget with strong mechanical integrity, tested to withstand pull-out and torque forces in automotive applications.

3. Stable Electrode Force — Repeatable Results

Pneumatic or servo-controlled electrode pressure ensures uniform contact between the nut projections and the sheet metal surface. This consistency is critical for production lines where thousands of identical welds are made daily.

4. Precision Welding Controller

Digital welding controller manages current, time and electrode force with millisecond precision. Welding parameters can be stored as recipes for different nut sizes and sheet thicknesses, ensuring batch-to-batch consistency.

This machine is specifically designed for heavy-duty M20 nut and stud bolt welding. Key capabilities include:

✓ High welding current output suitable for large M20 nut projections

✓ Adjustable electrode force for optimal projection collapse and fusion

✓ Compatible with carbon steel and stainless steel sheet metal up to 3mm+ thickness

✓ Weld joint strength verified through pull-out and torque testing

✓ Customizable electrode design for specific nut geometries

The projection welding cycle is completed in milliseconds. The digital controller ensures precise timing for consistent results.

Xinwei Welding Technology Co., Ltd. operates an 18,000 square meter manufacturing facility with a dedicated R&D team of over 20 engineers. ISO 9001, CE and RoHS certified. Serving customers in more than 30 countries worldwide.

As a resistance welding specialist, we design and manufacture stationary projection welders with customized electrodes and fixtures for specific nut and stud bolt applications. Every machine undergoes welding strength verification before shipment.

Send us your M20 nuts and sheet metal samples. Our welding engineers will perform projection welding tests and provide a detailed report including weld nugget cross-section, pull-out test results and recommended parameters — free of charge.

Send your nut and sheet samples for a free welding test

✓ Weld Nugget Cross-Section Inspection Per Machine

✓ Pull-Out Force Testing on Welded Nut Samples

✓ Torque Resistance Verification for Threaded Fasteners

✓ ISO 9001:2015 Certified Quality Management

✓ CE and RoHS Compliance for International Markets

Q: Can this machine reliably weld M20 nuts?

Yes. This stationary resistance projection welding machine is specifically designed for heavy-duty nut welding applications including M20 components. The high welding current output and stable electrode pressure ensure strong, consistent weld joints for large-size nuts.

Q: What is the difference between projection welding and standard spot welding for nuts?

Projection welding uses pre-formed projections on the nut contact surface to concentrate welding current at specific points, creating localized fusion. This produces stronger joints than standard spot welding for nut attachment applications. The flat electrodes also last longer since they contact the entire nut surface rather than a single point.

Q: Can this machine integrate with an automatic nut feeder?

Yes. The stationary design of this projection welder supports integration with automatic nut feeding systems for higher production efficiency. Our engineering team can assist with feeder selection and fixture customization for your specific production line layout.

Q: Can electrodes and fixtures be customized for different nut sizes?

Yes. We design and manufacture custom electrodes for your specific nut geometry, size and sheet metal thickness. Quick-change electrode holders are available for production lines that process multiple nut sizes.

Tell us your nut size, sheet metal thickness and production volume. Our engineers will design the optimal projection welding configuration and electrode setup for your application.

12-Month Warranty | Free Welding Test | Factory Direct from Xinwei