Laser Marking Hot Formed Steel Parts
Introduction
Hot formed steel parts are widely used in modern vehicle body structures, particularly in safety-critical areas such as B-pillars, door beams, and bumper reinforcements. These components achieve very high tensile strength through a hot stamping process, which allows manufacturers to reduce weight while maintaining crash performance. However, the same material properties that make hot formed steel attractive for structural design also make it difficult to mark permanently. Traditional marking methods often struggle to produce a durable, legible identification on surfaces with yield strength exceeding 700 MPa or on hot-formed steel with strength up to 1500 MPa.
This guide explains how laser marking hot formed steel parts is performed in automotive production, with a focus on deep VIN marking on body-in-white and high-strength steel components. It covers the working principle, key features, integration considerations, and traceability requirements that manufacturing engineers, production managers, and purchasing teams should understand when specifying marking equipment for hot formed steel applications.
Product Overview
A deep laser marking machine is designed specifically for permanent identification on high-strength and hot formed steel parts. Unlike standard laser marking systems that primarily affect the surface layer, a deep laser marking machine creates a marking depth that remains readable after painting and rubbing. This is essential for automotive VIN marking, where regulatory and traceability requirements demand a permanent, legible code that survives the full paint shop process. Learn more about KINMARK's Deep Laser Marking Machine.
KINMARK's Deep Laser Marking Machine is built for deep VIN marking on high-strength steel plates with yield strength exceeding 700 MPa and hot-formed steel plates with strength up to 1500 MPa. The marking depth on body-in-white can reach more than 0.2 mm. The system is intended for automotive mass production environments and supports integration with industrial robots or assisted manipulators.
The machine addresses a specific industrial problem: how to apply a permanent, traceable identification mark on materials that resist conventional marking methods, while maintaining production cycle times and integration with existing automated lines.
Working Principle
Deep laser marking on hot formed steel relies on a high-power laser source to remove or displace material from the surface, creating a recessed mark rather than a surface discoloration. The KINMARK system uses a 200W laser and a marking area of 112 mm × 112 mm. The process is controlled to achieve a marking depth of at least 0.2 mm on body-in-white, which ensures the VIN remains readable after the paint and rubbing process.
The system adopts a special marking process to ensure clear rubbing results after painting. This is important because the paint shop applies multiple layers of coating, and a shallow mark can become illegible after rubbing. By controlling depth and mark geometry, the deep laser marking machine produces characters that can be easily rubbed and identified.
For automated production, the marking head can be integrated with robots or assisted manipulators. Optional 3D vision guidance enables precise positioning and accurate marking, while optional 3D laser scanning measurement and OCR recognition systems provide online inspection of marking quality and support 100% traceability.
Key Features
Deep VIN Marking: Enables permanent VIN deep marking on high-strength steel plates with yield strength exceeding 700 MPa and hot-formed steel plates with strength up to 1500 MPa. Marking depth on body-in-white can reach more than 0.2 mm.
Easy Rubbing: A special marking process ensures clear rubbing results after painting, which is critical for VIN legibility in the paint shop.
Easy Integration: Designed with various mounting interfaces, the system can be quickly integrated with industrial robots or assisted manipulators for automated production lines.
Vision Guidance: Optional 3D vision guidance system enables precise positioning and accurate marking to improve production efficiency.
Automatic Traceability: Optional 3D laser scanning measurement and OCR recognition systems provide online inspection of marking quality and ensure 100% traceability.
Technical Specifications
| Power Supply | AC220V ±10%, 50Hz ±2% |
| Power Consumption | <1000W |
| Laser Power | 200W |
| Marking Area | 112mm × 112mm |
| Marking Depth | ≥0.2mm |
| Operating Temperature | 0~40℃ |
| Operating Humidity | ≤90% RH (Non-condensing) |
Applications
Laser marking hot formed steel parts is primarily used in automotive manufacturing, particularly for VIN marking on body-in-white and high-strength steel components. The deep laser marking machine is suitable for:
Automotive Manufacturing: VIN marking on vehicle bodies, especially where hot formed steel and high-strength steel are used in safety-critical structures.
Automotive Components: Permanent identification on components that require traceability through the production process.
New Energy Vehicles: Marking applications on body structures and components where lightweight, high-strength materials are common.
Powertrain Manufacturing: Traceability marking on powertrain components where durable identification is required.
Intelligent Factory Automation: Integration with robot cells and automated lines for consistent, high-volume marking.
The system is designed for automotive mass production environments where marking must be integrated into existing automated lines and must meet traceability requirements. Explore KINMARK's marking and traceability solutions for more automotive identification applications.
Benefits
Deep laser marking on hot formed steel parts provides several practical benefits for automotive manufacturers:
Permanent Identification: The marking depth of at least 0.2 mm on body-in-white ensures the VIN remains legible after painting and rubbing, supporting long-term traceability.
Material Compatibility: The system is designed to mark high-strength steel plates with yield strength exceeding 700 MPa and hot-formed steel plates with strength up to 1500 MPa, covering a wide range of modern body structures.
Process Integration: With various mounting interfaces, the marking head can be integrated with industrial robots or assisted manipulators, allowing marking to be embedded into automated production lines.
Quality Inspection: Optional 3D laser scanning measurement and OCR recognition enable online inspection of marking quality, helping manufacturers verify legibility and support 100% traceability.
Positioning Accuracy: Optional 3D vision guidance supports precise positioning and accurate marking, which is important for consistent VIN placement on complex body geometries.
Why Choose KINMARK
KINMARK has been involved in automotive intelligent automation equipment since 1996, with a focus on marking and traceability systems, servo press systems, fluid filling systems, and robot automation systems. The company's deep laser marking machine is part of its marking and traceability product line, developed for automotive manufacturing and related industries.
KINMARK has established long-term cooperation with automotive manufacturers and suppliers across the industry. The company provides installation and commissioning support, operator training, and after-sales service through offices and maintenance centers in multiple cities. For manufacturers working with hot formed steel parts, KINMARK's deep laser marking machine offers a focused solution for permanent VIN marking and traceability in mass production environments.
Frequently Asked Questions
What is the maximum marking depth on hot formed steel?
The KINMARK Deep Laser Marking Machine can achieve a marking depth of ≥0.2 mm on body-in-white. It is designed for high-strength steel plates with yield strength exceeding 700 MPa and hot-formed steel plates with strength up to 1500 MPa.
Can the marking withstand the paint shop process?
Yes. The system adopts a special marking process to ensure clear rubbing results after painting. The deep marking depth helps maintain legibility through paint application and rubbing.
Is the system suitable for automated production lines?
Yes. The marking head is designed with various mounting interfaces and can be quickly integrated with industrial robots or assisted manipulators. Optional 3D vision guidance is available for precise positioning.
How is marking quality verified?
Optional 3D laser scanning measurement and OCR recognition systems provide online inspection of marking quality and support 100% traceability. These options allow manufacturers to verify character legibility and depth as part of the production process.
What are the power requirements for the deep laser marking machine?
The system requires AC220V ±10%, 50Hz ±2%, with power consumption below 1000W. The laser power is 200W, and the marking area is 112 mm × 112 mm.
Conclusion
Laser marking hot formed steel parts is a specialized process that addresses the challenges of permanent identification on high-strength materials. For automotive manufacturers using hot formed steel in body structures, deep laser marking provides a reliable method for VIN marking that remains legible after painting and supports traceability requirements. The KINMARK Deep Laser Marking Machine is designed for this application, with a marking depth of ≥0.2 mm on body-in-white, integration options for automated lines, and optional vision and inspection systems. As vehicle structures continue to use high-strength and hot formed steel, selecting a marking system that can handle these materials is an important consideration for production engineers and decision makers.
If you're interested in any of the equipment mentioned in this article, feel free to contact our sales engineers for detailed product information and customized technical solutions.