The following article is written by Roman Mornau, general manager at MetalPlus, ACTOM. It is Part 2 of a two-part series.
Building on this success, welding repair techniques have expanded to encompass a wide range of industries, from repairing small pumps to refurbishing massive turbines for the power generation sector. The key lies in selecting the most appropriate welding technique for each repair, minimising invasiveness and ensuring the repaired component will function as effectively as the original.
Historically, welding was perceived as an aggressive process, with high heat input leading to distortion and potentially rendering components inferior. However, advancements in welding technology have mitigated these challenges. Techniques such as submerged arc micro-welding, which minimise heat input and distortion, have enabled the repair of previously deemed irreparable components. We have welding techniques that renders the component stronger with the same fatigue life after the weld repair. Such innovation has not only reduced repair costs but also empowered South African industries to localise critical maintenance tasks previously reliant on imports.
The emergence of CMT and laser welding, with their even lower heat inputs, has further expanded the scope of repairable components. These technologies enable precise repairs with minimal heat-affected zones, minimising the risk of embrittlement in the material, further reduction in distortion and ensuring the integrity of the repaired component.
Alongside extending equipment lifespan and reducing material costs, these advanced welding techniques also contribute to improved operational efficiency. In high-value rotating equipment, conventional welding methods can introduce stresses and distortions that lead to premature failures but by employing more refined techniques, industries can minimise downtime and ensure the continued reliable operation of critical machinery.
Taking environmental impact and sustainability to new heights
The environmental benefits of this repair-focused approach are significant. Replacing a large component necessitates the extraction, processing, and transportation of raw materials, resulting in a substantial carbon footprint. In contrast, repairing often involves minimal material usage and significantly lower energy consumption, which reduces the overall environmental impact.
Looking ahead, laser welding technology holds immense promise. With its extremely low heat input, laser welding enables highly precise repairs with minimal distortion, further expanding the range of repairable components. The integration of robotics and automation further enhances accuracy and efficiency, while minimising associated operational risks as well as minimising waste.
Advanced welding techniques are not just tools for repair; they are critical enablers of resource conservation and sustainability for capital-intensive industrial machines. By embracing a repair-oriented approach and leveraging innovative technologies, South African industries can enhance their operational efficiency, reduce environmental impact, and contribute to a more sustainable and resilient industrial landscape.