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ArcelorMittal Developed Welding And Mechanical Joining Techniques For Advanced Steel And Multi Material Parts

Steel News - Published on Mon, 17 Jun 2019

Image Source: ArcelorMittal
The development of advanced high strength steels has presented OEMs with unique challenges when it comes to joining materials. With the advent of multi-material parts, these challenges are amplified. ArcelorMittal Global R&D is constantly working with carmakers and suppliers to identify the right joining techniques and technologies for AHSS. To mitigate these challenges, the weldability of new AHSS concepts is evaluated at R&D lab level in the This process begins in the early stages of AHSS grade’s development. All new AHSS concepts are first evaluated by Global R&D at the laboratory level to determine their weldability. This initial assessment allows ArcelorMittal to focus product development on grades that will be compatible with OEM processes (even if some adaptations may be required).

In a second stage, before the new product is launched on the market, a complete weldability validation is performed. If necessary, guidelines are modified to facilitate the use of the new material by our customers. Once the new steel grade is ready to be used by customers, additional support is offered to fine-tune the welding parameters.

ArcelorMittal recommends several available technologies to join AHSS to:

Another AHSS steel
Other materials including aluminum and composites
Emerging technologies are also providing new options for spot welding and mechanical joining.
Joining AHSS to AHSS
Resistance spot welding (RSW) remains the default choice for OEMs who wish to join parts made from AHSS. RSW is a mature process with an excellent cost/quality ratio. It is suitable for all of ArcelorMittal’s AHSS families including Fortiform®, Ductibor®, and Usibor®.

The most recent AHSS on the market are compatible with RSW, although some parameter adaptations are required. For example, different pulsed procedures are recommended when joining some types of AHSS.
While it is not uncommon to join three AHSS sheets with different thicknesses and physical properties. However, some extreme stack-ups may be difficult to weld due to differences in the physical properties of the grades utilized. Again, welding parameters should be optimized to ensure a stable welding process.

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Posted By : Sanju Moirangthem on Mon, 17 Jun 2019
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