Welding standards have become a focal point in Supercars’ Gen3 chassis development, particularly regarding the use of TIG (tungsten inert gas) versus MIG (metal inert gas) welding. A recent inspection of Erebus-built chassis, supplied to Dick Johnson Racing (DJR), revealed TIG welding in areas of the rollover protection structure where MIG was originally intended. While TIG welding offers finer control and a neater finish, MIG welding is typically preferred in structural applications due to its higher deposition rate and deeper penetration.

The discrepancy arose from a regulatory gap—an initial 2022 rule aimed at mandating MIG welding expired when the 2023 Operations Manual was released, leaving teams without a defined requirement. To address this, Supercars updated its General Specification Document (GSD) before the 2025 Sydney 500, ensuring clarity in welding expectations moving forward. The change aligns with the category’s push for standardization, as variations in welding technique can influence chassis strength and crash performance.

Supercars’ chassis stiffness tests at Pace Innovations compared multiple constructions from Erebus, Pace, and Triple Eight. Results showed no significant differences in torsional rigidity or weight, reinforcing the structural integrity of all tested builds. However, this incident highlights the critical role of welding procedures in motorsport engineering, where minor inconsistencies can lead to safety and performance concerns. Moving forward, ongoing audits of chassis welds will help maintain consistency across the grid, ensuring that welding quality remains a non-variable in the competitive balance of Gen3 racing.

Source:

Supercars reveals chassis test findings amid rule update
An Erebus Gen3 chassis Chassis builds have been a major talking point since Gen3 began as the chassis are of
Speedcafe.comStefan Bartholomaeus
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