Efort Intelligent Equipment (埃夫特智能装备) is listed on the Shanghai Stock Exchange under code 688165. Its welding robot arms grew more than 100% in H1 2024 and account for the majority of its revenue. The specific product driving this growth is the hollow-wrist 6-axis welding robot — a design choice that has positioned Efort as the preferred supplier for China’s rail transit manufacturing boom.
What a Hollow Wrist Is and Why It Matters for Welding
In a conventional robot wrist, the welding cable bundle — power cable, wire feed liner, shielding gas hose, and sometimes water cooling — runs on the outside of the arm from the base to the torch. As the wrist rotates, this bundle twists. At the motion limits, the bundle is under maximum torsional stress. Cable bundles on conventional welding robots fail at wrist connection points every 6 to 18 months in high-cycle applications, requiring downtime and cable replacement.
A hollow-wrist design routes the cable bundle through the hollow axis of the wrist joint. The cable does not twist as the wrist rotates — it passes straight through the center. The result: cable bundle life increases from 6-18 months to 3-5 years in equivalent duty cycles. Downtime from cable failure approaches zero. The torch can also rotate through a full 360 degrees without cable interference, enabling welding geometries that are physically impossible with external cable routing.
Why Rail Transit Manufacturing Needs This
Rail transit structural fabrication — car body frames, bogie frames, underframe assemblies — involves long continuous welds on thick structural steel in complex orientations. A bogie frame (the wheel assembly structure under a rail car) contains approximately 150 meters of weld seams. Many of these seams require torch orientations that push wrist rotation to its limits. External cable bundles on conventional robots prevent access to corners and joints in confined structural geometries. Hollow-wrist robots reach these joints without constraint.
China’s rail transit expansion is the demand driver. The country operated 10,200 km of high-speed rail in 2015 and over 45,000 km by end of 2024. Each kilometer of new rail requires rolling stock. Each rail car requires thousands of meters of precision structural welds. Efort has signed supply agreements with CRRC, the world’s largest rolling stock manufacturer, as well as several of CRRC’s tier-1 structural fabrication suppliers.
Full Component Localization
Efort’s hollow-wrist welding robots use in-house controllers, servo drives, and precision reducers — no foreign component dependency. This is unusual even among Chinese robot manufacturers. Estun sources some servo components externally. Inovance uses a mix of internal and external suppliers. Efort’s full localization means its bill of materials is entirely within China’s domestic supply chain — important for government procurement customers who require supply chain independence, and increasingly important as international component sourcing faces geopolitical uncertainty.
Production Scale
Efort’s Wuhu facility currently produces approximately 12,000 robot units per year. Its super-plant (Phase 1: 50,000 units/year) is under construction at a $263M investment. When Phase 1 completes, Efort will have the largest single-site robot production capacity of any Chinese manufacturer. Full buildout targets 100,000 units per year.
For Efort’s factory profile see Efort Intelligent Equipment. Full China robot ranking: Top 40 China Robot Rankings 2025.
Sources
- Efort Intelligent Equipment: H1 2024 earnings report (August 2024)
- Shanghai Stock Exchange: Efort 688165 investor relations (2025)
- ESM China: Welding robot market China 2024
