StirLight secures £1.25m pre-seed to provide real-time weld quality assurance via sensors
This article covers StirLight, a startup that has closed a pre-seed funding round of £1.25m to accelerate commercialisation of StirSense, its quality assurance platform for friction stir welding across aerospace, automotive, defence and energy supply chains. The funding, comprising more than £750k in pre-seed investment and £500k in grant funding, will support pilot deployments, hiring of engineering and data science staff and further platform development to give manufacturers in those sectors in-process visibility and traceable quality records for every joint.
StirLight has closed a pre-seed funding round of £1.25 million to accelerate commercialisation of StirSense, its quality assurance platform for friction stir welding across aerospace, automotive, defence and energy supply chains. The package combines more than £750,000 in pre-seed investment with £500,000 in grant funding to support pilot deployments, hire engineering and data science staff, and further develop the platform.
Why it matters
Friction stir welding (FSW) is becoming more important to manufacturers pursuing lighter, stronger and more energy-efficient joints, particularly in aerospace and automotive applications. The technology’s wider adoption has been constrained by the difficulty of verifying weld quality in real time, forcing many firms to rely on slow and costly post-weld inspection. StirLight’s platform aims to give manufacturers in-process visibility and traceable records for every joint, which could cut inspection costs and reduce barriers to scaling FSW on production lines.
Inside the product
StirSense captures process-specific data during friction stir welding and applies analysis to detect anomalies as welding proceeds. The platform records traceable quality information for each joint produced, intended to reduce dependence on specialist manual inspection and to support higher throughput. That combination of sensors, data capture and anomaly detection is pitched at manufacturers that need to validate weld integrity without stopping production for destructive or offline testing.
Who are the investors?
The £1.25 million package comprises two parts. More than £750,000 in pre-seed funding came from Haatch Ventures, The British Business Bank, D2N2 and a group of angel investors. That equity backing is complemented by £500,000 in grants from Innovate UK and The Aerospace Technology Institute (ATI), awarded across two separate research and development projects.
Haatch Ventures is an early-stage venture investor that typically backs technology companies at pre-seed and seed stages. The British Business Bank is the UK’s economic development bank, which provides patient capital and guarantees to support smaller firms. D2N2 is a regional economic partnership that funds projects in the Derbyshire and Nottinghamshire area and supports local industrial innovation. Innovate UK and the ATI are public research and development funders with a track record of supporting industrial technologies and aerospace-related projects.
The combined mix of private pre-seed capital and targeted grant support reflects a common funding pattern for hardware and manufacturing-focused startups that require both product development capital and subsidised R&D to reach pilot-scale industrial deployments.
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Founder perspective
Toby Savage-Yu, Chief Executive Officer at StirLight, said:
FSW produces some of the best joints in the world. The problem has always been proving it at scale, and that is what StirSense solves. We are delighted by the support from Innovate UK, ATI and our pre-seed investors who moved quickly to back this critical technology.
Savage-Yu and the team plan to use the funds to run pilot deployments with industrial partners, recruit engineers and data scientists, and continue maturing the core platform. The company is actively seeking manufacturing partners in its target sectors to integrate real-time quality assurance into their FSW operations.
The bigger picture
The announcement underscores ongoing investor and public-sector interest in industrial digitalisation and manufacturing automation across the UK. Solutions that provide process-level assurance are increasingly valued as manufacturers shift toward lightweight materials and more automated joining techniques to meet efficiency and emissions goals. At the same time, many UK manufacturers face workforce pressures that make in-process automation and traceability attractive investments.
StirLight’s raise follows a pattern where capital for deep-tech hardware ventures combines venture investment with public grants to bridge the long development cycles typical in advanced manufacturing.
The deal also highlights continued support from UK institutions for projects that aim to de-risk manufacturing technologies for aerospace and automotive supply chains, a priority for regional and national industrial strategy.
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